Released version 6.1.3

examples/animation/animation.pro

@@ -0,0 +1,19 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET  = animation
+
+HEADERS = \
+    plot.h
+
+SOURCES = \
+    plot.cpp \
+    main.cpp

examples/animation/main.cpp

@@ -0,0 +1,46 @@
+#include <qapplication.h>
+#include "plot.h"
+
+#ifndef QWT_NO_OPENGL
+#define USE_OPENGL 1
+#endif
+
+#if USE_OPENGL
+#include <qgl.h>
+#include <qwt_plot_glcanvas.h>
+#else
+#include <qwt_plot_canvas.h>
+#endif
+
+int main ( int argc, char **argv )
+{
+#if USE_OPENGL
+#if QT_VERSION >= 0x040600 && QT_VERSION < 0x050000
+    // on my box QPaintEngine::OpenGL2 has serious problems, f.e:
+    // the lines of a simple drawRect are wrong.
+
+    QGL::setPreferredPaintEngine( QPaintEngine::OpenGL );
+#endif
+#endif
+
+    QApplication a( argc, argv );
+
+    Plot plot;
+
+#if USE_OPENGL
+    QwtPlotGLCanvas *canvas = new QwtPlotGLCanvas();
+    canvas->setFrameStyle( QwtPlotGLCanvas::NoFrame );
+#else
+    QwtPlotCanvas *canvas = new QwtPlotCanvas();
+    canvas->setFrameStyle( QFrame::NoFrame );
+    canvas->setPaintAttribute( QwtPlotCanvas::BackingStore, false );
+#endif
+
+    plot.setCanvas( canvas );
+    plot.setCanvasBackground( QColor( 30, 30, 50 ) );
+
+    plot.resize( 400, 400 );
+    plot.show();
+
+    return a.exec();
+}

examples/animation/plot.cpp

@@ -0,0 +1,241 @@
+#include <qapplication.h>
+#include <qwt_math.h>
+#include <qwt_symbol.h>
+#include <qwt_curve_fitter.h>
+#include <qwt_plot_curve.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_layout.h>
+#include <qevent.h>
+#include "plot.h"
+
+class Curve: public QwtPlotCurve
+{
+public:
+    void setTransformation( const QTransform &transform )
+    {
+        d_transform = transform;
+    }
+
+    virtual void updateSamples( double phase )
+    {
+        setSamples( d_transform.map( points( phase ) ) );
+    }
+
+private:
+    virtual QPolygonF points( double phase ) const = 0;
+
+private:
+    QTransform d_transform;
+};
+
+class Curve1: public Curve
+{
+public:
+    Curve1()
+    {
+        setPen( QColor( 150, 150, 200 ), 2 );
+        setStyle( QwtPlotCurve::Lines );
+
+        QwtSplineCurveFitter *curveFitter = new QwtSplineCurveFitter();
+        curveFitter->setSplineSize( 150 );
+        setCurveFitter( curveFitter );
+
+        setCurveAttribute( QwtPlotCurve::Fitted, true );
+
+        QwtSymbol *symbol = new QwtSymbol( QwtSymbol::XCross );
+        symbol->setPen( Qt::yellow );
+        symbol->setSize( 7 );
+
+        setSymbol( symbol );
+
+        // somewhere to the left
+        QTransform transform;
+        transform.scale( 1.5, 1.0 );
+        transform.translate( 1.5, 3.0 );
+
+        setTransformation( transform );
+    }
+
+    virtual QPolygonF points( double phase ) const
+    {
+        QPolygonF points;
+
+        const int numSamples = 15;
+        for ( int i = 0; i < numSamples; i++ )
+        {
+            const double v = 6.28 * double( i ) / double( numSamples - 1 );
+            points += QPointF( qSin( v - phase ), v );
+        }
+
+        return points;
+    }
+};
+
+class Curve2: public Curve
+{
+public:
+    Curve2()
+    {
+        setStyle( QwtPlotCurve::Sticks );
+        setPen( QColor( 200, 150, 50 ) );
+
+        setSymbol( new QwtSymbol( QwtSymbol::Ellipse,
+            QColor( Qt::gray ), QColor( Qt::yellow ), QSize( 5, 5 ) ) );
+    }
+
+private:
+    virtual QPolygonF points( double phase ) const
+    {
+        QPolygonF points;
+
+        const int numSamples = 50;
+        for ( int i = 0; i < numSamples; i++ )
+        {
+            const double v = 10.0 * i / double( numSamples - 1 );
+            points += QPointF( v, qCos( 3.0 * ( v + phase ) ) );
+        }
+
+        return points;
+    }
+};
+
+class Curve3: public Curve
+{       
+public: 
+    Curve3()
+    {
+        setStyle( QwtPlotCurve::Lines );
+        setPen( QColor( 100, 200, 150 ), 2 );
+
+        QwtSplineCurveFitter* curveFitter = new QwtSplineCurveFitter();
+        curveFitter->setFitMode( QwtSplineCurveFitter::ParametricSpline );
+        curveFitter->setSplineSize( 200 );
+        setCurveFitter( curveFitter );
+
+        setCurveAttribute( QwtPlotCurve::Fitted, true );
+
+        // somewhere in the top right corner
+        QTransform transform;
+        transform.translate( 7.0, 7.5 );
+        transform.scale( 2.0, 2.0 );
+
+        setTransformation( transform );
+    }   
+
+private:
+    virtual QPolygonF points( double phase ) const
+    {
+        QPolygonF points;
+
+        const int numSamples = 9;
+        for ( int i = 0; i < numSamples; i++ )
+        {
+            const double v = i * 2.0 * M_PI / ( numSamples - 1 );
+            points += QPointF( qSin( v - phase ), qCos( 3.0 * ( v + phase ) ) );
+        }
+
+        return points;
+    }
+};  
+
+class Curve4: public Curve
+{       
+public: 
+    Curve4()
+    {
+        setStyle( QwtPlotCurve::Lines );
+        setPen( Qt::red, 2 );
+
+        initSamples();
+
+        // somewhere in the center
+        QTransform transform;
+        transform.translate( 7.0, 3.0 );
+        transform.scale( 1.5, 1.5 );
+
+        setTransformation( transform );
+    }   
+
+private:
+    virtual QPolygonF points( double phase ) const
+    {
+        const double speed = 0.05;
+
+        const double s = speed * qSin( phase );
+        const double c = qSqrt( 1.0 - s * s );
+
+        for ( int i = 0; i < d_points.size(); i++ )
+        {
+            const QPointF p = d_points[i];
+
+            const double u = p.x();
+            const double v = p.y();
+
+            d_points[i].setX( u * c - v * s );
+            d_points[i].setY( v * c + u * s );
+        }
+
+        return d_points;
+    }
+
+    void initSamples()
+    {
+        const int numSamples = 15;
+
+        for ( int i = 0; i < numSamples; i++ )
+        {
+            const double angle = i * ( 2.0 * M_PI / ( numSamples - 1 ) );
+
+            QPointF p( qCos( angle ), qSin( angle ) );
+            if ( i % 2 )
+                p *= 0.4;
+            
+            d_points += p;
+        }
+    }
+
+private:
+    mutable QPolygonF d_points;
+};  
+
+Plot::Plot( QWidget *parent ):
+    QwtPlot( parent)
+{
+    setAutoReplot( false );
+
+    setTitle( "Animated Curves" );
+
+    // hide all axes
+    for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
+        enableAxis( axis, false );
+
+    plotLayout()->setCanvasMargin( 10 );
+
+    d_curves[0] = new Curve1();
+    d_curves[1] = new Curve2();
+    d_curves[2] = new Curve3();
+    d_curves[3] = new Curve4();
+
+    updateCurves();
+
+    for ( int i = 0; i < CurveCount; i++ )
+        d_curves[i]->attach( this );
+
+    d_time.start();
+    ( void )startTimer( 40 );
+}
+
+void Plot::timerEvent( QTimerEvent * )
+{
+    updateCurves();
+    replot();
+}
+
+void Plot::updateCurves()
+{
+    const double speed = 2 * M_PI / 25000.0; // a cycle every 25 seconds
+
+    const double phase = d_time.elapsed() * speed;
+    for ( int i = 0; i < CurveCount; i++ )
+        d_curves[i]->updateSamples( phase );
+}

examples/animation/plot.h

@@ -0,0 +1,21 @@
+#include <qwt_plot.h>
+#include <qdatetime.h>
+
+class Curve;
+
+class Plot: public QwtPlot
+{
+public:
+    Plot( QWidget * = NULL);
+
+protected:
+    virtual void timerEvent( QTimerEvent * );
+
+private:
+    void updateCurves();
+
+    enum { CurveCount = 4 };
+    Curve *d_curves[CurveCount];
+
+    QTime d_time;
+};

examples/barchart/barchart.cpp

@@ -0,0 +1,132 @@
+#include "barchart.h"
+#include <qwt_plot_renderer.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_multi_barchart.h>
+#include <qwt_column_symbol.h>
+#include <qwt_plot_layout.h>
+#include <qwt_legend.h>
+#include <qwt_scale_draw.h>
+
+BarChart::BarChart( QWidget *parent ):
+    QwtPlot( parent )
+{
+    setAutoFillBackground( true );
+
+    setPalette( Qt::white );
+    canvas()->setPalette( QColor( "LemonChiffon" ) );
+
+    setTitle( "Bar Chart" );
+
+    setAxisTitle( QwtPlot::yLeft, "Whatever" );
+    setAxisTitle( QwtPlot::xBottom, "Whatever" );
+
+    d_barChartItem = new QwtPlotMultiBarChart( "Bar Chart " );
+    d_barChartItem->setLayoutPolicy( QwtPlotMultiBarChart::AutoAdjustSamples );
+    d_barChartItem->setSpacing( 20 );
+    d_barChartItem->setMargin( 3 );
+
+    d_barChartItem->attach( this );
+
+    insertLegend( new QwtLegend() );
+
+    populate();
+    setOrientation( 0 );
+
+    setAutoReplot( true );
+}
+
+void BarChart::populate()
+{
+    static const char *colors[] = { "DarkOrchid", "SteelBlue", "Gold" };
+
+    const int numSamples = 5;
+    const int numBars = sizeof( colors ) / sizeof( colors[0] );
+
+    QList<QwtText> titles;
+    for ( int i = 0; i < numBars; i++ )
+    {
+        QString title("Bar %1");
+        titles += title.arg( i );
+    }
+    d_barChartItem->setBarTitles( titles );
+    d_barChartItem->setLegendIconSize( QSize( 10, 14 ) );
+
+    for ( int i = 0; i < numBars; i++ )
+    {
+        QwtColumnSymbol *symbol = new QwtColumnSymbol( QwtColumnSymbol::Box );
+        symbol->setLineWidth( 2 );
+        symbol->setFrameStyle( QwtColumnSymbol::Raised );
+        symbol->setPalette( QPalette( colors[i] ) );
+
+        d_barChartItem->setSymbol( i, symbol );
+    }
+    
+    QVector< QVector<double> > series;
+    for ( int i = 0; i < numSamples; i++ )
+    {
+        QVector<double> values;
+        for ( int j = 0; j < numBars; j++ )
+            values += ( 2 + qrand() % 8 );
+
+        series += values;
+    }
+
+    d_barChartItem->setSamples( series );
+}
+
+void BarChart::setMode( int mode )
+{
+    if ( mode == 0 )
+    {
+        d_barChartItem->setStyle( QwtPlotMultiBarChart::Grouped );
+    }
+    else
+    {
+        d_barChartItem->setStyle( QwtPlotMultiBarChart::Stacked );
+    }
+}
+
+void BarChart::setOrientation( int orientation )
+{
+    QwtPlot::Axis axis1, axis2;
+
+    if ( orientation == 0 )
+    {
+        axis1 = QwtPlot::xBottom;
+        axis2 = QwtPlot::yLeft;
+
+        d_barChartItem->setOrientation( Qt::Vertical );
+    }
+    else
+    {
+        axis1 = QwtPlot::yLeft;
+        axis2 = QwtPlot::xBottom;
+
+        d_barChartItem->setOrientation( Qt::Horizontal );
+    }
+
+    setAxisScale( axis1, 0, d_barChartItem->dataSize() - 1, 1.0 );
+    setAxisAutoScale( axis2 );
+
+    QwtScaleDraw *scaleDraw1 = axisScaleDraw( axis1 );
+    scaleDraw1->enableComponent( QwtScaleDraw::Backbone, false );
+    scaleDraw1->enableComponent( QwtScaleDraw::Ticks, false );
+
+    QwtScaleDraw *scaleDraw2 = axisScaleDraw( axis2 );
+    scaleDraw2->enableComponent( QwtScaleDraw::Backbone, true );
+    scaleDraw2->enableComponent( QwtScaleDraw::Ticks, true );
+
+    plotLayout()->setAlignCanvasToScale( axis1, true );
+    plotLayout()->setAlignCanvasToScale( axis2, false );
+
+    plotLayout()->setCanvasMargin( 0 );
+    updateCanvasMargins();
+
+    replot();
+}
+
+void BarChart::exportChart()
+{
+    QwtPlotRenderer renderer;
+    renderer.exportTo( this, "barchart.pdf" );
+}

examples/barchart/barchart.h

@@ -0,0 +1,25 @@
+#ifndef _BAR_CHART_H_
+
+#include <qwt_plot.h>
+
+class QwtPlotMultiBarChart;
+
+class BarChart: public QwtPlot
+{
+    Q_OBJECT
+
+public:
+    BarChart( QWidget * = NULL );
+
+public Q_SLOTS:
+    void setMode( int );
+    void setOrientation( int );
+    void exportChart();
+
+private:
+    void populate();
+
+    QwtPlotMultiBarChart *d_barChartItem;
+};
+
+#endif

examples/barchart/barchart.pro

@@ -0,0 +1,19 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET   = barchart
+
+SOURCES = \
+    barchart.cpp \
+    main.cpp
+
+HEADERS = \
+    barchart.h

examples/barchart/main.cpp

@@ -0,0 +1,64 @@
+#include <qapplication.h>
+#include <qmainwindow.h>
+#include <qtoolbar.h>
+#include <qtoolbutton.h>
+#include <qcombobox.h>
+#include "barchart.h"
+
+class MainWindow: public QMainWindow
+{
+public:
+    MainWindow( QWidget * = NULL );
+
+private:
+    BarChart *d_chart;
+};
+
+MainWindow::MainWindow( QWidget *parent ):
+    QMainWindow( parent )
+{
+    d_chart = new BarChart( this );
+    setCentralWidget( d_chart );
+
+    QToolBar *toolBar = new QToolBar( this );
+
+    QComboBox *typeBox = new QComboBox( toolBar );
+    typeBox->addItem( "Grouped" );
+    typeBox->addItem( "Stacked" );
+    typeBox->setSizePolicy( QSizePolicy::Fixed, QSizePolicy::Fixed );
+
+    QComboBox *orientationBox = new QComboBox( toolBar );
+    orientationBox->addItem( "Vertical" );
+    orientationBox->addItem( "Horizontal" );
+    orientationBox->setSizePolicy( QSizePolicy::Fixed, QSizePolicy::Fixed );
+
+    QToolButton *btnExport = new QToolButton( toolBar );
+    btnExport->setText( "Export" );
+    btnExport->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+    connect( btnExport, SIGNAL( clicked() ), d_chart, SLOT( exportChart() ) );
+
+    toolBar->addWidget( typeBox );
+    toolBar->addWidget( orientationBox );
+    toolBar->addWidget( btnExport );
+    addToolBar( toolBar );
+
+    d_chart->setMode( typeBox->currentIndex() );
+    connect( typeBox, SIGNAL( currentIndexChanged( int ) ),
+             d_chart, SLOT( setMode( int ) ) );
+
+    d_chart->setOrientation( orientationBox->currentIndex() );
+    connect( orientationBox, SIGNAL( currentIndexChanged( int ) ),
+             d_chart, SLOT( setOrientation( int ) ) );
+}
+
+int main( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    MainWindow mainWindow;
+
+    mainWindow.resize( 600, 400 );
+    mainWindow.show();
+
+    return a.exec();
+}

examples/bode/bode.pro

@@ -0,0 +1,23 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET       = bode
+
+HEADERS = \
+    mainwindow.h \
+    plot.h \
+    complexnumber.h \ 
+    pixmaps.h
+
+SOURCES = \
+    plot.cpp \
+    mainwindow.cpp \
+    main.cpp

examples/bode/complexnumber.h

@@ -0,0 +1,83 @@
+#ifndef _COMPLEX_NUMBER_H_
+#define _COMPLEX_NUMBER_H_
+
+#include <math.h>
+
+class ComplexNumber
+{
+public:
+    ComplexNumber() ;
+    ComplexNumber( double r, double i = 0.0 );
+
+    double real() const;
+    double imag() const;
+
+    friend ComplexNumber operator*(
+        const ComplexNumber &, const ComplexNumber & );
+
+    friend ComplexNumber operator+(
+        const ComplexNumber &, const ComplexNumber & );
+
+    friend ComplexNumber operator-(
+        const ComplexNumber &, const ComplexNumber & );
+    friend ComplexNumber operator/(
+        const ComplexNumber &, const ComplexNumber & );
+
+private:
+    double d_real;
+    double d_imag;
+};
+
+inline ComplexNumber::ComplexNumber():
+    d_real( 0.0 ),
+    d_imag( -0.0 )
+{
+}
+
+inline ComplexNumber::ComplexNumber( double re, double im ):
+    d_real( re ),
+    d_imag( im )
+{
+}
+
+inline double ComplexNumber::real() const
+{
+    return d_real;
+}
+
+inline double ComplexNumber::imag() const
+{
+    return d_imag;
+}
+
+inline ComplexNumber operator+(
+    const ComplexNumber &x1, const ComplexNumber &x2 )
+{
+    return ComplexNumber( x1.d_real + x2.d_real, x1.d_imag + x2.d_imag );
+}
+
+inline ComplexNumber operator-(
+    const ComplexNumber &x1, const ComplexNumber &x2 )
+{
+    return ComplexNumber( x1.d_real - x2.d_real, x1.d_imag - x2.d_imag );
+}
+
+inline ComplexNumber operator*(
+    const ComplexNumber &x1, const ComplexNumber &x2 )
+{
+    return ComplexNumber( x1.d_real * x2.d_real - x1.d_imag * x2.d_imag,
+        x1.d_real * x2.d_imag + x2.d_real * x1.d_imag );
+}
+
+inline ComplexNumber operator/(
+    const ComplexNumber &x1, const ComplexNumber &x2 )
+{
+    double denom = x2.d_real * x2.d_real + x2.d_imag * x2.d_imag;
+
+    return ComplexNumber(
+               ( x1.d_real * x2.d_real + x1.d_imag * x2.d_imag ) / denom,
+               ( x1.d_imag * x2.d_real - x2.d_imag * x1.d_real ) / denom
+           );
+}
+
+#endif

examples/bode/main.cpp

@@ -0,0 +1,13 @@
+#include <qapplication.h>
+#include "mainwindow.h"
+
+int main ( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    MainWindow w;
+    w.resize( 540, 400 );
+    w.show();
+
+    return a.exec();
+}

examples/bode/mainwindow.cpp

@@ -0,0 +1,231 @@
+#include <qregexp.h>
+#include <qtoolbar.h>
+#include <qtoolbutton.h>
+#include <qlabel.h>
+#include <qlayout.h>
+#include <qstatusbar.h>
+#include <qprinter.h>
+#include <qpicture.h>
+#include <qpainter.h>
+#include <qprintdialog.h>
+#include <qwt_counter.h>
+#include <qwt_picker_machine.h>
+#include <qwt_plot_zoomer.h>
+#include <qwt_plot_panner.h>
+#include <qwt_plot_renderer.h>
+#include <qwt_text.h>
+#include <qwt_math.h>
+#include "pixmaps.h"
+#include "plot.h"
+#include "mainwindow.h"
+
+class Zoomer: public QwtPlotZoomer
+{
+public:
+    Zoomer( int xAxis, int yAxis, QWidget *canvas ):
+        QwtPlotZoomer( xAxis, yAxis, canvas )
+    {
+        setTrackerMode( QwtPicker::AlwaysOff );
+        setRubberBand( QwtPicker::NoRubberBand );
+
+        // RightButton: zoom out by 1
+        // Ctrl+RightButton: zoom out to full size
+
+        setMousePattern( QwtEventPattern::MouseSelect2,
+            Qt::RightButton, Qt::ControlModifier );
+        setMousePattern( QwtEventPattern::MouseSelect3,
+            Qt::RightButton );
+    }
+};
+
+//-----------------------------------------------------------------
+//
+//      bode.cpp -- A demo program featuring QwtPlot and QwtCounter
+//
+//      This example demonstrates the mapping of different curves
+//      to different axes in a QwtPlot widget. It also shows how to
+//      display the cursor position and how to implement zooming.
+//
+//-----------------------------------------------------------------
+
+MainWindow::MainWindow( QWidget *parent ):
+    QMainWindow( parent )
+{
+    d_plot = new Plot( this );
+
+    const int margin = 5;
+    d_plot->setContentsMargins( margin, margin, margin, 0 );
+
+    setContextMenuPolicy( Qt::NoContextMenu );
+
+    d_zoomer[0] = new Zoomer( QwtPlot::xBottom, QwtPlot::yLeft,
+        d_plot->canvas() );
+    d_zoomer[0]->setRubberBand( QwtPicker::RectRubberBand );
+    d_zoomer[0]->setRubberBandPen( QColor( Qt::green ) );
+    d_zoomer[0]->setTrackerMode( QwtPicker::ActiveOnly );
+    d_zoomer[0]->setTrackerPen( QColor( Qt::white ) );
+
+    d_zoomer[1] = new Zoomer( QwtPlot::xTop, QwtPlot::yRight,
+         d_plot->canvas() );
+
+    d_panner = new QwtPlotPanner( d_plot->canvas() );
+    d_panner->setMouseButton( Qt::MidButton );
+
+    d_picker = new QwtPlotPicker( QwtPlot::xBottom, QwtPlot::yLeft,
+        QwtPlotPicker::CrossRubberBand, QwtPicker::AlwaysOn,
+        d_plot->canvas() );
+    d_picker->setStateMachine( new QwtPickerDragPointMachine() );
+    d_picker->setRubberBandPen( QColor( Qt::green ) );
+    d_picker->setRubberBand( QwtPicker::CrossRubberBand );
+    d_picker->setTrackerPen( QColor( Qt::white ) );
+
+    setCentralWidget( d_plot );
+
+    QToolBar *toolBar = new QToolBar( this );
+
+    QToolButton *btnZoom = new QToolButton( toolBar );
+    btnZoom->setText( "Zoom" );
+    btnZoom->setIcon( QPixmap( zoom_xpm ) );
+    btnZoom->setCheckable( true );
+    btnZoom->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+    toolBar->addWidget( btnZoom );
+    connect( btnZoom, SIGNAL( toggled( bool ) ), SLOT( enableZoomMode( bool ) ) );
+
+#ifndef QT_NO_PRINTER
+    QToolButton *btnPrint = new QToolButton( toolBar );
+    btnPrint->setText( "Print" );
+    btnPrint->setIcon( QPixmap( print_xpm ) );
+    btnPrint->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+    toolBar->addWidget( btnPrint );
+    connect( btnPrint, SIGNAL( clicked() ), SLOT( print() ) );
+#endif
+
+    QToolButton *btnExport = new QToolButton( toolBar );
+    btnExport->setText( "Export" );
+    btnExport->setIcon( QPixmap( print_xpm ) );
+    btnExport->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+    toolBar->addWidget( btnExport );
+    connect( btnExport, SIGNAL( clicked() ), SLOT( exportDocument() ) );
+
+    toolBar->addSeparator();
+
+    QWidget *hBox = new QWidget( toolBar );
+
+    QHBoxLayout *layout = new QHBoxLayout( hBox );
+    layout->setSpacing( 0 );
+    layout->addWidget( new QWidget( hBox ), 10 ); // spacer
+    layout->addWidget( new QLabel( "Damping Factor", hBox ), 0 );
+    layout->addSpacing( 10 );
+
+    QwtCounter *cntDamp = new QwtCounter( hBox );
+    cntDamp->setRange( 0.0, 5.0 );
+    cntDamp->setSingleStep( 0.01 );
+    cntDamp->setValue( 0.0 );
+
+    layout->addWidget( cntDamp, 0 );
+
+    ( void )toolBar->addWidget( hBox );
+
+    addToolBar( toolBar );
+#ifndef QT_NO_STATUSBAR
+    ( void )statusBar();
+#endif
+
+    enableZoomMode( false );
+    showInfo();
+
+    connect( cntDamp, SIGNAL( valueChanged( double ) ),
+        d_plot, SLOT( setDamp( double ) ) );
+
+    connect( d_picker, SIGNAL( moved( const QPoint & ) ),
+        SLOT( moved( const QPoint & ) ) );
+    connect( d_picker, SIGNAL( selected( const QPolygon & ) ),
+        SLOT( selected( const QPolygon & ) ) );
+}
+
+#ifndef QT_NO_PRINTER
+
+void MainWindow::print()
+{
+    QPrinter printer( QPrinter::HighResolution );
+
+    QString docName = d_plot->title().text();
+    if ( !docName.isEmpty() )
+    {
+        docName.replace ( QRegExp ( QString::fromLatin1 ( "\n" ) ), tr ( " -- " ) );
+        printer.setDocName ( docName );
+    }
+
+    printer.setCreator( "Bode example" );
+    printer.setOrientation( QPrinter::Landscape );
+
+    QPrintDialog dialog( &printer );
+    if ( dialog.exec() )
+    {
+        QwtPlotRenderer renderer;
+
+        if ( printer.colorMode() == QPrinter::GrayScale )
+        {
+            renderer.setDiscardFlag( QwtPlotRenderer::DiscardBackground );
+            renderer.setDiscardFlag( QwtPlotRenderer::DiscardCanvasBackground );
+            renderer.setDiscardFlag( QwtPlotRenderer::DiscardCanvasFrame );
+            renderer.setLayoutFlag( QwtPlotRenderer::FrameWithScales );
+        }
+
+        renderer.renderTo( d_plot, printer );
+    }
+}
+
+#endif
+
+void MainWindow::exportDocument()
+{
+    QwtPlotRenderer renderer;
+    renderer.exportTo( d_plot, "bode.pdf" );
+}
+
+void MainWindow::enableZoomMode( bool on )
+{
+    d_panner->setEnabled( on );
+
+    d_zoomer[0]->setEnabled( on );
+    d_zoomer[0]->zoom( 0 );
+
+    d_zoomer[1]->setEnabled( on );
+    d_zoomer[1]->zoom( 0 );
+
+    d_picker->setEnabled( !on );
+
+    showInfo();
+}
+
+void MainWindow::showInfo( QString text )
+{
+    if ( text == QString::null )
+    {
+        if ( d_picker->rubberBand() )
+            text = "Cursor Pos: Press left mouse button in plot region";
+        else
+            text = "Zoom: Press mouse button and drag";
+    }
+
+#ifndef QT_NO_STATUSBAR
+    statusBar()->showMessage( text );
+#endif
+}
+
+void MainWindow::moved( const QPoint &pos )
+{
+    QString info;
+    info.sprintf( "Freq=%g, Ampl=%g, Phase=%g",
+        d_plot->invTransform( QwtPlot::xBottom, pos.x() ),
+        d_plot->invTransform( QwtPlot::yLeft, pos.y() ),
+        d_plot->invTransform( QwtPlot::yRight, pos.y() )
+    );
+    showInfo( info );
+}
+
+void MainWindow::selected( const QPolygon & )
+{
+    showInfo();
+}

examples/bode/mainwindow.h

@@ -0,0 +1,35 @@
+#include <qmainwindow.h>
+
+class QwtPlotZoomer;
+class QwtPlotPicker;
+class QwtPlotPanner;
+class Plot;
+class QPolygon;
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow( QWidget *parent = 0 );
+
+private Q_SLOTS:
+    void moved( const QPoint & );
+    void selected( const QPolygon & );
+
+#ifndef QT_NO_PRINTER
+    void print();
+#endif
+
+    void exportDocument();
+    void enableZoomMode( bool );
+
+private:
+    void showInfo( QString text = QString::null );
+
+    Plot *d_plot;
+
+    QwtPlotZoomer *d_zoomer[2];
+    QwtPlotPicker *d_picker;
+    QwtPlotPanner *d_panner;
+};

examples/bode/pixmaps.h

@@ -0,0 +1,99 @@
+#ifndef PIXMAPS_H
+#define PIXMAPS_H
+
+static const char *print_xpm[] =
+{
+    "32 32 12 1",
+    "a c #ffffff",
+    "h c #ffff00",
+    "c c #ffffff",
+    "f c #dcdcdc",
+    "b c #c0c0c0",
+    "j c #a0a0a4",
+    "e c #808080",
+    "g c #808000",
+    "d c #585858",
+    "i c #00ff00",
+    "# c #000000",
+    ". c None",
+    "................................",
+    "................................",
+    "...........###..................",
+    "..........#abb###...............",
+    ".........#aabbbbb###............",
+    ".........#ddaaabbbbb###.........",
+    "........#ddddddaaabbbbb###......",
+    ".......#deffddddddaaabbbbb###...",
+    "......#deaaabbbddddddaaabbbbb###",
+    ".....#deaaaaaaabbbddddddaaabbbb#",
+    "....#deaaabbbaaaa#ddedddfggaaad#",
+    "...#deaaaaaaaaaa#ddeeeeafgggfdd#",
+    "..#deaaabbbaaaa#ddeeeeabbbbgfdd#",
+    ".#deeefaaaaaaa#ddeeeeabbhhbbadd#",
+    "#aabbbeeefaaa#ddeeeeabbbbbbaddd#",
+    "#bbaaabbbeee#ddeeeeabbiibbadddd#",
+    "#bbbbbaaabbbeeeeeeabbbbbbaddddd#",
+    "#bjbbbbbbaaabbbbeabbbbbbadddddd#",
+    "#bjjjjbbbbbbaaaeabbbbbbaddddddd#",
+    "#bjaaajjjbbbbbbaaabbbbadddddddd#",
+    "#bbbbbaaajjjbbbbbbaaaaddddddddd#",
+    "#bjbbbbbbaaajjjbbbbbbddddddddd#.",
+    "#bjjjjbbbbbbaaajjjbbbdddddddd#..",
+    "#bjaaajjjbbbbbbjaajjbddddddd#...",
+    "#bbbbbaaajjjbbbjbbaabdddddd#....",
+    "###bbbbbbaaajjjjbbbbbddddd#.....",
+    "...###bbbbbbaaajbbbbbdddd#......",
+    "......###bbbbbbjbbbbbddd#.......",
+    ".........###bbbbbbbbbdd#........",
+    "............###bbbbbbd#.........",
+    "...............###bbb#..........",
+    "..................###..........."
+};
+
+
+static const char *zoom_xpm[] =
+{
+    "32 32 8 1",
+    "# c #000000",
+    "b c #c0c0c0",
+    "a c #ffffff",
+    "e c #585858",
+    "d c #a0a0a4",
+    "c c #0000ff",
+    "f c #00ffff",
+    ". c None",
+    "..######################........",
+    ".#a#baaaaaaaaaaaaaaaaaa#........",
+    "#aa#baaaaaaaaaaaaaccaca#........",
+    "####baaaaaaaaaaaaaaaaca####.....",
+    "#bbbbaaaaaaaaaaaacccaaa#da#.....",
+    "#aaaaaaaaaaaaaaaacccaca#da#.....",
+    "#aaaaaaaaaaaaaaaaaccaca#da#.....",
+    "#aaaaaaaaaabe###ebaaaaa#da#.....",
+    "#aaaaaaaaa#########aaaa#da#.....",
+    "#aaaaaaaa###dbbbb###aaa#da#.....",
+    "#aaaaaaa###aaaaffb###aa#da#.....",
+    "#aaaaaab##aaccaaafb##ba#da#.....",
+    "#aaaaaae#daaccaccaad#ea#da#.....",
+    "#aaaaaa##aaaaaaccaab##a#da#.....",
+    "#aaaaaa##aacccaaaaab##a#da#.....",
+    "#aaaaaa##aaccccaccab##a#da#.....",
+    "#aaaaaae#daccccaccad#ea#da#.....",
+    "#aaaaaab##aacccaaaa##da#da#.....",
+    "#aaccacd###aaaaaaa###da#da#.....",
+    "#aaaaacad###daaad#####a#da#.....",
+    "#acccaaaad##########da##da#.....",
+    "#acccacaaadde###edd#eda#da#.....",
+    "#aaccacaaaabdddddbdd#eda#a#.....",
+    "#aaaaaaaaaaaaaaaaaadd#eda##.....",
+    "#aaaaaaaaaaaaaaaaaaadd#eda#.....",
+    "#aaaaaaaccacaaaaaaaaadd#eda#....",
+    "#aaaaaaaaaacaaaaaaaaaad##eda#...",
+    "#aaaaaacccaaaaaaaaaaaaa#d#eda#..",
+    "########################dd#eda#.",
+    "...#dddddddddddddddddddddd##eda#",
+    "...#aaaaaaaaaaaaaaaaaaaaaa#.####",
+    "...########################..##."
+};
+
+#endif

examples/bode/plot.cpp

@@ -0,0 +1,190 @@
+#include <qwt_math.h>
+#include <qwt_scale_engine.h>
+#include <qwt_symbol.h>
+#include <qwt_plot_grid.h>
+#include <qwt_plot_marker.h>
+#include <qwt_plot_curve.h>
+#include <qwt_legend.h>
+#include <qwt_text.h>
+#include <qwt_plot_canvas.h>
+#include <qmath.h>
+#include "complexnumber.h"
+#include "plot.h"
+
+#if QT_VERSION < 0x040601
+#define qExp(x) ::exp(x)
+#define qAtan2(y, x) ::atan2(y, x)
+#endif
+
+static void logSpace( double *array, int size, double xmin, double xmax )
+{
+    if ( ( xmin <= 0.0 ) || ( xmax <= 0.0 ) || ( size <= 0 ) )
+        return;
+
+    const int imax = size - 1;
+
+    array[0] = xmin;
+    array[imax] = xmax;
+
+    const double lxmin = log( xmin );
+    const double lxmax = log( xmax );
+    const double lstep = ( lxmax - lxmin ) / double( imax );
+
+    for ( int i = 1; i < imax; i++ )
+        array[i] = qExp( lxmin + double( i ) * lstep );
+}
+
+Plot::Plot( QWidget *parent ):
+    QwtPlot( parent )
+{
+    setAutoReplot( false );
+
+    setTitle( "Frequency Response of a Second-Order System" );
+
+    QwtPlotCanvas *canvas = new QwtPlotCanvas();
+    canvas->setBorderRadius( 10 );
+
+    setCanvas( canvas );
+    setCanvasBackground( QColor( "MidnightBlue" ) );
+
+    // legend
+    QwtLegend *legend = new QwtLegend;
+    insertLegend( legend, QwtPlot::BottomLegend );
+
+    // grid
+    QwtPlotGrid *grid = new QwtPlotGrid;
+    grid->enableXMin( true );
+    grid->setMajorPen( Qt::white, 0, Qt::DotLine );
+    grid->setMinorPen( Qt::gray, 0 , Qt::DotLine );
+    grid->attach( this );
+
+    // axes
+    enableAxis( QwtPlot::yRight );
+    setAxisTitle( QwtPlot::xBottom, "Normalized Frequency" );
+    setAxisTitle( QwtPlot::yLeft, "Amplitude [dB]" );
+    setAxisTitle( QwtPlot::yRight, "Phase [deg]" );
+
+    setAxisMaxMajor( QwtPlot::xBottom, 6 );
+    setAxisMaxMinor( QwtPlot::xBottom, 9 );
+    setAxisScaleEngine( QwtPlot::xBottom, new QwtLogScaleEngine );
+
+    // curves
+    d_curve1 = new QwtPlotCurve( "Amplitude" );
+    d_curve1->setRenderHint( QwtPlotItem::RenderAntialiased );
+    d_curve1->setPen( Qt::yellow );
+    d_curve1->setLegendAttribute( QwtPlotCurve::LegendShowLine );
+    d_curve1->setYAxis( QwtPlot::yLeft );
+    d_curve1->attach( this );
+
+    d_curve2 = new QwtPlotCurve( "Phase" );
+    d_curve2->setRenderHint( QwtPlotItem::RenderAntialiased );
+    d_curve2->setPen( Qt::cyan );
+    d_curve2->setLegendAttribute( QwtPlotCurve::LegendShowLine );
+    d_curve2->setYAxis( QwtPlot::yRight );
+    d_curve2->attach( this );
+
+    // marker
+    d_marker1 = new QwtPlotMarker();
+    d_marker1->setValue( 0.0, 0.0 );
+    d_marker1->setLineStyle( QwtPlotMarker::VLine );
+    d_marker1->setLabelAlignment( Qt::AlignRight | Qt::AlignBottom );
+    d_marker1->setLinePen( Qt::green, 0, Qt::DashDotLine );
+    d_marker1->attach( this );
+
+    d_marker2 = new QwtPlotMarker();
+    d_marker2->setLineStyle( QwtPlotMarker::HLine );
+    d_marker2->setLabelAlignment( Qt::AlignRight | Qt::AlignBottom );
+    d_marker2->setLinePen( QColor( 200, 150, 0 ), 0, Qt::DashDotLine );
+    d_marker2->setSymbol( new QwtSymbol( QwtSymbol::Diamond,
+        QColor( Qt::yellow ), QColor( Qt::green ), QSize( 8, 8 ) ) );
+    d_marker2->attach( this );
+
+    setDamp( 0.0 );
+
+    setAutoReplot( true );
+}
+
+void Plot::showData( const double *frequency, const double *amplitude,
+    const double *phase, int count )
+{
+    d_curve1->setSamples( frequency, amplitude, count );
+    d_curve2->setSamples( frequency, phase, count );
+}
+
+void Plot::showPeak( double freq, double amplitude )
+{
+    QString label;
+    label.sprintf( "Peak: %.3g dB", amplitude );
+
+    QwtText text( label );
+    text.setFont( QFont( "Helvetica", 10, QFont::Bold ) );
+    text.setColor( QColor( 200, 150, 0 ) );
+
+    d_marker2->setValue( freq, amplitude );
+    d_marker2->setLabel( text );
+}
+
+void Plot::show3dB( double freq )
+{
+    QString label;
+    label.sprintf( "-3 dB at f = %.3g", freq );
+
+    QwtText text( label );
+    text.setFont( QFont( "Helvetica", 10, QFont::Bold ) );
+    text.setColor( Qt::green );
+
+    d_marker1->setValue( freq, 0.0 );
+    d_marker1->setLabel( text );
+}
+
+//
+// re-calculate frequency response
+//
+void Plot::setDamp( double damping )
+{
+    const bool doReplot = autoReplot();
+    setAutoReplot( false );
+
+    const int ArraySize = 200;
+
+    double frequency[ArraySize];
+    double amplitude[ArraySize];
+    double phase[ArraySize];
+
+    // build frequency vector with logarithmic division
+    logSpace( frequency, ArraySize, 0.01, 100 );
+
+    int i3 = 1;
+    double fmax = 1;
+    double amax = -1000.0;
+
+    for ( int i = 0; i < ArraySize; i++ )
+    {
+        double f = frequency[i];
+        const ComplexNumber g =
+            ComplexNumber( 1.0 ) / ComplexNumber( 1.0 - f * f, 2.0 * damping * f );
+
+        amplitude[i] = 20.0 * log10( qSqrt( g.real() * g.real() + g.imag() * g.imag() ) );
+        phase[i] = qAtan2( g.imag(), g.real() ) * ( 180.0 / M_PI );
+
+        if ( ( i3 <= 1 ) && ( amplitude[i] < -3.0 ) )
+            i3 = i;
+        if ( amplitude[i] > amax )
+        {
+            amax = amplitude[i];
+            fmax = frequency[i];
+        }
+
+    }
+
+    double f3 = frequency[i3] - ( frequency[i3] - frequency[i3 - 1] )
+        / ( amplitude[i3] - amplitude[i3 -1] ) * ( amplitude[i3] + 3 );
+
+    showPeak( fmax, amax );
+    show3dB( f3 );
+    showData( frequency, amplitude, phase, ArraySize );
+
+    setAutoReplot( doReplot );
+
+    replot();
+}

examples/bode/plot.h

@@ -0,0 +1,31 @@
+#ifndef _PLOT_H_
+#define _PLOT_H_
+
+#include <qwt_plot.h>
+
+class QwtPlotCurve;
+class QwtPlotMarker;
+
+class Plot: public QwtPlot
+{
+    Q_OBJECT
+
+public:
+    Plot( QWidget *parent );
+
+public Q_SLOTS:
+    void setDamp( double damping );
+
+private:
+    void showData( const double *frequency, const double *amplitude,
+        const double *phase, int count );
+    void showPeak( double freq, double amplitude );
+    void show3dB( double freq );
+
+    QwtPlotCurve *d_curve1;
+    QwtPlotCurve *d_curve2;
+    QwtPlotMarker *d_marker1;
+    QwtPlotMarker *d_marker2;
+};
+
+#endif

examples/controls/controls.pro

@@ -0,0 +1,34 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET       = controls
+
+HEADERS = \
+    sliderbox.h \
+    slidertab.h \
+    wheelbox.h \
+    wheeltab.h \
+    knobbox.h \
+    knobtab.h \
+    dialbox.h \
+    dialtab.h
+
+SOURCES = \
+    sliderbox.cpp \
+    slidertab.cpp \
+    wheelbox.cpp \
+    wheeltab.cpp \
+    knobbox.cpp \
+    knobtab.cpp \
+    dialbox.cpp \
+    dialtab.cpp \
+    main.cpp
+

examples/controls/dialbox.cpp

@@ -0,0 +1,163 @@
+#include <qlabel.h>
+#include <qlayout.h>
+#include <qwt_dial.h>
+#include <qwt_dial_needle.h>
+#include <qwt_scale_engine.h>
+#include <qwt_transform.h>
+#include <qwt_round_scale_draw.h>
+#include "dialbox.h"
+
+DialBox::DialBox( QWidget *parent, int type ):
+    QWidget( parent )
+{
+    d_dial = createDial( type );
+
+    d_label = new QLabel( this );
+    d_label->setAlignment( Qt::AlignCenter );
+
+    QVBoxLayout *layout = new QVBoxLayout( this );;
+    layout->setSpacing( 0 );
+    layout->addWidget( d_dial, 10 );
+    layout->addWidget( d_label );
+
+    connect( d_dial, SIGNAL( valueChanged( double ) ), 
+        this, SLOT( setNum( double ) ) );
+
+    setNum( d_dial->value() );
+}
+
+QwtDial *DialBox::createDial( int type ) const
+{
+    QwtDial *dial = new QwtDial();
+    dial->setTracking( true );
+    dial->setFocusPolicy( Qt::StrongFocus );
+    dial->setObjectName( QString( "Dial %1" ).arg( type + 1 ) );
+
+    QColor needleColor( Qt::red );
+
+    switch( type )
+    {
+        case 0:
+        {
+            dial->setOrigin( 135.0 );
+            dial->setScaleArc( 0.0, 270.0 );
+            dial->setScaleMaxMinor( 4 );
+            dial->setScaleMaxMajor( 10 );
+            dial->setScale( -100.0, 100.0 );
+
+            needleColor = QColor( "Goldenrod" );
+
+            break;
+        }
+        case 1:
+        {
+            dial->setOrigin( 135.0 );
+            dial->setScaleArc( 0.0, 270.0 );
+            dial->setScaleMaxMinor( 10 );
+            dial->setScaleMaxMajor( 10 );
+            dial->setScale( 10.0, 0.0 );
+
+            QwtRoundScaleDraw *scaleDraw = new QwtRoundScaleDraw();
+            scaleDraw->setSpacing( 8 );
+            scaleDraw->enableComponent( 
+                QwtAbstractScaleDraw::Backbone, false );
+            scaleDraw->setTickLength( QwtScaleDiv::MinorTick, 2 );
+            scaleDraw->setTickLength( QwtScaleDiv::MediumTick, 4 );
+            scaleDraw->setTickLength( QwtScaleDiv::MajorTick, 8 );
+            dial->setScaleDraw( scaleDraw );
+
+            break;
+        }
+        case 2:
+        {
+            dial->setOrigin( 150.0 );
+            dial->setScaleArc( 0.0, 240.0 );
+
+            QwtLinearScaleEngine *scaleEngine = new QwtLinearScaleEngine( 2 );
+            scaleEngine->setTransformation( new QwtPowerTransform( 2 ) );
+            dial->setScaleEngine( scaleEngine );
+
+            QList< double > ticks[ QwtScaleDiv::NTickTypes ];
+            ticks[ QwtScaleDiv::MajorTick ] << 0 << 4 
+                << 16 << 32 << 64 << 96 << 128;
+            ticks[ QwtScaleDiv::MediumTick ] << 24 << 48 << 80 << 112;
+            ticks[ QwtScaleDiv::MinorTick ] 
+                << 0.5 << 1 << 2 
+                << 7 << 10 << 13
+                << 20 << 28 
+                << 40 << 56 
+                << 72 << 88 
+                << 104 << 120; 
+ 
+            dial->setScale( QwtScaleDiv( 0, 128, ticks ) );
+            break;
+        }
+        case 3:
+        {
+            dial->setOrigin( 135.0 );
+            dial->setScaleArc( 0.0, 270.0 );
+            dial->setScaleMaxMinor( 9 );
+            dial->setScaleEngine( new QwtLogScaleEngine );
+            dial->setScale( 1.0e-2, 1.0e2 );
+
+            break;
+        }
+        case 4:
+        {
+            dial->setOrigin( 225.0 );
+            dial->setScaleArc( 0.0, 360.0 );
+            dial->setScaleMaxMinor( 5 );
+            dial->setScaleStepSize( 20 );
+            dial->setScale( 100.0, -100.0 );
+            dial->setWrapping( true );
+            dial->setTotalSteps( 40 );
+            dial->setMode( QwtDial::RotateScale );
+            dial->setValue( 70.0 );
+
+            needleColor = QColor( "DarkSlateBlue" );
+
+            break;
+        }
+        case 5:
+        {
+            dial->setOrigin( 45.0 );
+            dial->setScaleArc( 0.0, 225.0 );
+            dial->setScaleMaxMinor( 5 );
+            dial->setScaleMaxMajor( 10 );
+            dial->setScale( 0.0, 10.0 );
+
+            break;
+        }
+    }
+
+    QwtDialSimpleNeedle *needle = new QwtDialSimpleNeedle(
+        QwtDialSimpleNeedle::Arrow, true, needleColor,
+        QColor( Qt::gray ).light( 130 ) );
+    dial->setNeedle( needle );
+
+    //const QColor base( QColor( "DimGray" ) );
+    const QColor base( QColor( Qt::darkGray ).dark( 150 ) );
+
+    QPalette palette;
+    palette.setColor( QPalette::Base, base );
+    palette.setColor( QPalette::Window, base.dark( 150 ) );
+    palette.setColor( QPalette::Mid, base.dark( 110 ) );
+    palette.setColor( QPalette::Light, base.light( 170 ) );
+    palette.setColor( QPalette::Dark, base.dark( 170 ) );
+    palette.setColor( QPalette::Text, base.dark( 200 ).light( 800 ) );
+    palette.setColor( QPalette::WindowText, base.dark( 200 ) );
+
+    dial->setPalette( palette );
+    dial->setLineWidth( 4 );
+    dial->setFrameShadow( QwtDial::Sunken );
+
+    return dial;
+}
+
+void DialBox::setNum( double v )
+{
+    QString text;
+    text.setNum( v, 'f', 2 );
+
+    d_label->setText( text );
+}

examples/controls/dialbox.h

@@ -0,0 +1,25 @@
+#ifndef _DIAL_BOX_H_
+#define _DIAL_BOX_H_
+
+#include <qwidget.h>
+
+class QLabel;
+class QwtDial;
+
+class DialBox: public QWidget
+{
+    Q_OBJECT
+public:
+    DialBox( QWidget *parent, int type );
+
+private Q_SLOTS:
+    void setNum( double v );
+
+private:
+    QwtDial *createDial( int type ) const;
+
+    QwtDial *d_dial;
+    QLabel *d_label;
+};
+
+#endif

examples/controls/dialtab.cpp

@@ -0,0 +1,17 @@
+#include "dialtab.h"
+#include "dialbox.h"
+#include <qlayout.h>
+
+DialTab::DialTab( QWidget *parent ):
+    QWidget( parent )
+{
+    QGridLayout *layout = new QGridLayout( this );
+
+    const int numRows = 3;
+    for ( int i = 0; i < 2 * numRows; i++ )
+    {
+        DialBox *dialBox = new DialBox( this, i );
+        layout->addWidget( dialBox, i / numRows, i % numRows );
+    }
+}
+

examples/controls/dialtab.h

@@ -0,0 +1,12 @@
+#ifndef _DIAL_TAB_H
+#define _DIAL_TAB_H 1
+
+#include <qwidget.h>
+
+class DialTab: public QWidget
+{
+public:
+    DialTab( QWidget *parent = NULL );
+};
+
+#endif

examples/controls/knobbox.cpp

@@ -0,0 +1,119 @@
+#include <qlabel.h>
+#include <qlayout.h>
+#include <qwt_knob.h>
+#include <qwt_scale_engine.h>
+#include <qwt_transform.h>
+#include "knobbox.h"
+
+KnobBox::KnobBox( QWidget *parent, int knobType ):
+    QWidget( parent )
+{
+    d_knob = createKnob( knobType );
+    d_knob->setKnobWidth( 100 );
+
+    d_label = new QLabel( this );
+    d_label->setAlignment( Qt::AlignCenter );
+
+    QVBoxLayout *layout = new QVBoxLayout( this );;
+    layout->setSpacing( 0 );
+    layout->addWidget( d_knob, 10 );
+    layout->addWidget( d_label );
+    layout->addStretch( 10 );
+
+    connect( d_knob, SIGNAL( valueChanged( double ) ), 
+        this, SLOT( setNum( double ) ) );
+
+    setNum( d_knob->value() );
+}
+
+QwtKnob *KnobBox::createKnob( int knobType ) const
+{
+    QwtKnob *knob = new QwtKnob();
+    knob->setTracking( true );
+
+    switch( knobType )
+    {
+        case 0:
+        {
+            knob->setKnobStyle( QwtKnob::Sunken );
+            knob->setMarkerStyle( QwtKnob::Nub );
+            knob->setWrapping( true );
+            knob->setNumTurns( 4 );
+            knob->setScaleStepSize( 10.0 );
+            knob->setScale( 0, 400 );
+            knob->setTotalSteps( 400 );
+            break;
+        }
+        case 1:
+        {
+            knob->setKnobStyle( QwtKnob::Sunken );
+            knob->setMarkerStyle( QwtKnob::Dot );
+            break;
+        }
+        case 2:
+        {
+            knob->setKnobStyle( QwtKnob::Sunken );
+            knob->setMarkerStyle( QwtKnob::Tick );
+            
+            QwtLinearScaleEngine *scaleEngine = new QwtLinearScaleEngine( 2 );
+            scaleEngine->setTransformation( new QwtPowerTransform( 2 ) );
+            knob->setScaleEngine( scaleEngine );
+
+            QList< double > ticks[ QwtScaleDiv::NTickTypes ];
+            ticks[ QwtScaleDiv::MajorTick ] << 0 << 4 
+                << 16 << 32 << 64 << 96 << 128;
+            ticks[ QwtScaleDiv::MediumTick ] << 24 << 48 << 80 << 112;
+            ticks[ QwtScaleDiv::MinorTick ] 
+                << 0.5 << 1 << 2 
+                << 7 << 10 << 13
+                << 20 << 28 
+                << 40 << 56 
+                << 72 << 88 
+                << 104 << 120; 
+ 
+            knob->setScale( QwtScaleDiv( 0, 128, ticks ) );
+
+            knob->setTotalSteps( 100 );
+            knob->setStepAlignment( false );
+            knob->setSingleSteps( 1 );
+            knob->setPageSteps( 5 );
+
+            break;
+        }
+        case 3:
+        {
+            knob->setKnobStyle( QwtKnob::Flat );
+            knob->setMarkerStyle( QwtKnob::Notch );
+            knob->setScaleEngine( new QwtLogScaleEngine() );
+            knob->setScaleStepSize( 1.0 );
+            knob->setScale( 0.1, 1000.0 );
+            knob->setScaleMaxMinor( 10 );
+            break;
+        }
+        case 4:
+        {
+            knob->setKnobStyle( QwtKnob::Raised );
+            knob->setMarkerStyle( QwtKnob::Dot );
+            knob->setWrapping( true );
+            break;
+        }
+        case 5:
+        {
+            knob->setKnobStyle( QwtKnob::Styled );
+            knob->setMarkerStyle( QwtKnob::Triangle );
+            knob->setTotalAngle( 180.0 );
+            knob->setScale( 100, -100 );
+            break;
+        }
+    }
+
+    return knob;
+}
+
+void KnobBox::setNum( double v )
+{
+    QString text;
+    text.setNum( v, 'f', 2 );
+
+    d_label->setText( text );
+}

examples/controls/knobbox.h

@@ -0,0 +1,25 @@
+#ifndef _KNOB_BOX_H_
+#define _KNOB_BOX_H_
+
+#include <qwidget.h>
+
+class QLabel;
+class QwtKnob;
+
+class KnobBox: public QWidget
+{
+    Q_OBJECT
+public:
+    KnobBox( QWidget *parent, int knobType );
+
+private Q_SLOTS:
+    void setNum( double v );
+
+private:
+    QwtKnob *createKnob( int knobType ) const;
+
+    QwtKnob *d_knob;
+    QLabel *d_label;
+};
+
+#endif

examples/controls/knobtab.cpp

@@ -0,0 +1,17 @@
+#include "knobtab.h"
+#include "knobbox.h"
+#include <qlayout.h>
+
+KnobTab::KnobTab( QWidget *parent ):
+    QWidget( parent )
+{
+    QGridLayout *layout = new QGridLayout( this );
+
+    const int numRows = 3;
+    for ( int i = 0; i < 2 * numRows; i++ )
+    {
+        KnobBox *knobBox = new KnobBox( this, i );
+        layout->addWidget( knobBox, i / numRows, i % numRows );
+    }
+}
+

examples/controls/knobtab.h

@@ -0,0 +1,12 @@
+#ifndef _KNOB_TAB_H
+#define _KNOB_TAB_H 1
+
+#include <qwidget.h>
+
+class KnobTab: public QWidget
+{
+public:
+    KnobTab( QWidget *parent = NULL );
+};
+
+#endif

examples/controls/main.cpp

@@ -0,0 +1,41 @@
+#include <qapplication.h>
+#include <qtabwidget.h>
+#include "slidertab.h"
+#include "wheeltab.h"
+#include "knobtab.h"
+#include "dialtab.h"
+
+
+int main ( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    QTabWidget tabWidget;
+
+    SliderTab *sliderTab = new SliderTab();
+    sliderTab->setAutoFillBackground( true );
+    sliderTab->setPalette( QColor( "DimGray" ) );
+
+    WheelTab *wheelTab = new WheelTab();
+    wheelTab->setAutoFillBackground( true );
+    wheelTab->setPalette( QColor( "Silver" ) );
+
+    KnobTab *knobTab = new KnobTab();
+    knobTab->setAutoFillBackground( true );
+    knobTab->setPalette( Qt::darkGray );
+
+    DialTab *dialTab = new DialTab();
+    dialTab->setAutoFillBackground( true );
+    dialTab->setPalette( Qt::darkGray );
+
+    tabWidget.addTab( new SliderTab, "Slider" );
+    tabWidget.addTab( new WheelTab, "Wheel/Thermo" );
+    tabWidget.addTab( knobTab, "Knob" );
+    tabWidget.addTab( dialTab, "Dial" );
+
+    tabWidget.resize( 800, 600 );
+    tabWidget.show();
+
+    return a.exec();
+}
+

examples/controls/sliderbox.cpp

@@ -0,0 +1,172 @@
+#include <qlabel.h>
+#include <qlayout.h>
+#include <qwt_slider.h>
+#include <qwt_scale_engine.h>
+#include <qwt_transform.h>
+#include "sliderbox.h"
+
+SliderBox::SliderBox( int sliderType, QWidget *parent ):
+    QWidget( parent )
+{
+    d_slider = createSlider( sliderType );
+
+    QFlags<Qt::AlignmentFlag> alignment;
+
+    if ( d_slider->orientation() == Qt::Horizontal )
+    {
+        if ( d_slider->scalePosition() == QwtSlider::TrailingScale )
+            alignment = Qt::AlignBottom;
+        else
+            alignment = Qt::AlignTop;
+
+        alignment |= Qt::AlignHCenter;
+    }
+    else
+    {
+        if ( d_slider->scalePosition() == QwtSlider::TrailingScale )
+            alignment = Qt::AlignRight;
+        else
+            alignment = Qt::AlignLeft;
+
+        alignment |= Qt::AlignVCenter;
+    }
+
+    d_label = new QLabel( this );
+    d_label->setAlignment( alignment );
+    d_label->setFixedWidth( d_label->fontMetrics().width( "10000.9" ) );
+
+    connect( d_slider, SIGNAL( valueChanged( double ) ), SLOT( setNum( double ) ) );
+
+    QBoxLayout *layout;
+    if ( d_slider->orientation() == Qt::Horizontal )
+        layout = new QHBoxLayout( this );
+    else
+        layout = new QVBoxLayout( this );
+
+    layout->addWidget( d_slider );
+    layout->addWidget( d_label );
+
+    setNum( d_slider->value() );
+}
+
+QwtSlider *SliderBox::createSlider( int sliderType ) const
+{
+    QwtSlider *slider = new QwtSlider();
+
+    switch( sliderType )
+    {
+        case 0:
+        {
+            slider->setOrientation( Qt::Horizontal );
+            slider->setScalePosition( QwtSlider::TrailingScale );
+            slider->setTrough( true );
+            slider->setGroove( false );
+            slider->setSpacing( 0 );
+            slider->setHandleSize( QSize( 30, 16 ) );
+            slider->setScale( 10.0, -10.0 ); 
+            slider->setTotalSteps( 8 ); 
+            slider->setSingleSteps( 1 ); 
+            slider->setPageSteps( 1 ); 
+            slider->setWrapping( true );
+            break;
+        }
+        case 1:
+        {
+            slider->setOrientation( Qt::Horizontal );
+            slider->setScalePosition( QwtSlider::NoScale );
+            slider->setTrough( true );
+            slider->setGroove( true );
+            slider->setScale( 0.0, 1.0 );
+            slider->setTotalSteps( 100 );
+            slider->setSingleSteps( 1 );
+            slider->setPageSteps( 5 );
+            break;
+        }
+        case 2:
+        {
+            slider->setOrientation( Qt::Horizontal );
+            slider->setScalePosition( QwtSlider::LeadingScale );
+            slider->setTrough( false );
+            slider->setGroove( true );
+            slider->setHandleSize( QSize( 12, 25 ) );
+            slider->setScale( 1000.0, 3000.0 );
+            slider->setTotalSteps( 200.0 );
+            slider->setSingleSteps( 2 );
+            slider->setPageSteps( 10 );
+            break;
+        }
+        case 3:
+        {
+            slider->setOrientation( Qt::Horizontal );
+            slider->setScalePosition( QwtSlider::TrailingScale );
+            slider->setTrough( true );
+            slider->setGroove( true );
+
+            QwtLinearScaleEngine *scaleEngine = new QwtLinearScaleEngine( 2 );
+            scaleEngine->setTransformation( new QwtPowerTransform( 2 ) );
+            slider->setScaleEngine( scaleEngine );
+            slider->setScale( 0.0, 128.0 );
+            slider->setTotalSteps( 100 );
+            slider->setStepAlignment( false );
+            slider->setSingleSteps( 1 );
+            slider->setPageSteps( 5 );
+            break;
+        }
+        case 4:
+        {
+            slider->setOrientation( Qt::Vertical );
+            slider->setScalePosition( QwtSlider::TrailingScale );
+            slider->setTrough( false );
+            slider->setGroove( true );
+            slider->setScale( 100.0, 0.0 );
+            slider->setInvertedControls( true );
+            slider->setTotalSteps( 100 );
+            slider->setPageSteps( 5 );
+            slider->setScaleMaxMinor( 5 );
+            break;
+        }
+        case 5:
+        {
+            slider->setOrientation( Qt::Vertical );
+            slider->setScalePosition( QwtSlider::NoScale );
+            slider->setTrough( true );
+            slider->setGroove( false );
+            slider->setScale( 0.0, 100.0 );
+            slider->setTotalSteps( 100 );
+            slider->setPageSteps( 10 );
+            break;
+        }
+        case 6:
+        {
+            slider->setOrientation( Qt::Vertical );
+            slider->setScalePosition( QwtSlider::LeadingScale );
+            slider->setTrough( true );
+            slider->setGroove( true );
+            slider->setScaleEngine( new QwtLogScaleEngine );
+            slider->setStepAlignment( false );
+            slider->setHandleSize( QSize( 20, 32 ) );
+            slider->setBorderWidth( 1 );
+            slider->setScale( 1.0, 1.0e4 );
+            slider->setTotalSteps( 100 );
+            slider->setPageSteps( 10 );
+            slider->setScaleMaxMinor( 9 );
+            break;
+        }
+    }
+
+    if ( slider )
+    {
+        QString name( "Slider %1" );
+        slider->setObjectName( name.arg( sliderType ) );
+    }
+
+    return slider;
+}
+
+void SliderBox::setNum( double v )
+{
+    QString text;
+    text.setNum( v, 'f', 2 );
+
+    d_label->setText( text );
+}

examples/controls/sliderbox.h

@@ -0,0 +1,25 @@
+#ifndef _SLIDER_BOX_H_
+#define _SLIDER_BOX_H_ 1
+
+#include <qwidget.h>
+
+class QLabel;
+class QwtSlider;
+
+class SliderBox: public QWidget
+{
+    Q_OBJECT
+public:
+    SliderBox( int sliderType, QWidget *parent = NULL );
+
+private Q_SLOTS:
+    void setNum( double v );
+
+private:
+    QwtSlider *createSlider( int sliderType ) const;
+
+    QwtSlider *d_slider;
+    QLabel *d_label;
+};
+
+#endif

examples/controls/slidertab.cpp

@@ -0,0 +1,37 @@
+#include "slidertab.h"
+#include "sliderbox.h"
+#include <qlayout.h>
+
+SliderTab::SliderTab( QWidget *parent ):
+    QWidget( parent )
+{
+    int i;
+
+    QBoxLayout *hLayout = createLayout( Qt::Vertical );
+    for ( i = 0; i < 4; i++ )
+        hLayout->addWidget( new SliderBox( i ) );
+    hLayout->addStretch();
+
+    QBoxLayout *vLayout = createLayout( Qt::Horizontal );
+    for ( ; i < 7; i++ )
+        vLayout->addWidget( new SliderBox( i ) );
+
+    QBoxLayout *mainLayout = createLayout( Qt::Horizontal, this );
+    mainLayout->addLayout( vLayout );
+    mainLayout->addLayout( hLayout, 10 );
+}
+
+QBoxLayout *SliderTab::createLayout( 
+    Qt::Orientation orientation, QWidget *widget )
+{
+    QBoxLayout *layout =
+        new QBoxLayout( QBoxLayout::LeftToRight, widget );
+
+    if ( orientation == Qt::Vertical )
+        layout->setDirection( QBoxLayout::TopToBottom );
+
+    layout->setSpacing( 20 );
+    layout->setMargin( 0 );
+
+    return layout;
+}

examples/controls/slidertab.h

@@ -0,0 +1,18 @@
+#ifndef _SLIDER_TAB_H
+#define _SLIDER_TAB_H 1
+
+#include <qwidget.h>
+
+class QBoxLayout;
+
+class SliderTab: public QWidget
+{
+public:
+    SliderTab( QWidget *parent = NULL );
+
+private:
+    QBoxLayout *createLayout( Qt::Orientation,
+        QWidget *widget = NULL );
+};
+
+#endif

examples/controls/wheelbox.cpp

@@ -0,0 +1,188 @@
+#include <qlabel.h>
+#include <qlayout.h>
+#include <qwt_wheel.h>
+#include <qwt_thermo.h>
+#include <qwt_scale_engine.h>
+#include <qwt_transform.h>
+#include <qwt_color_map.h>
+#include "wheelbox.h"
+
+WheelBox::WheelBox( Qt::Orientation orientation,
+        int type, QWidget *parent ):
+    QWidget( parent )
+{
+    QWidget *box = createBox( orientation, type );
+    d_label = new QLabel( this );
+    d_label->setAlignment( Qt::AlignHCenter | Qt::AlignTop );
+
+    QBoxLayout *layout = new QVBoxLayout( this );
+    layout->addWidget( box );
+    layout->addWidget( d_label );
+
+    setNum( d_wheel->value() );
+
+    connect( d_wheel, SIGNAL( valueChanged( double ) ), 
+        this, SLOT( setNum( double ) ) );
+}
+
+QWidget *WheelBox::createBox( 
+    Qt::Orientation orientation, int type ) 
+{
+    d_wheel = new QwtWheel();
+    d_wheel->setValue( 80 );
+    d_wheel->setWheelWidth( 20 );
+    d_wheel->setMass( 1.0 );
+
+    d_thermo = new QwtThermo();
+    d_thermo->setOrientation( orientation );
+
+    if ( orientation == Qt::Horizontal )
+    {
+        d_thermo->setScalePosition( QwtThermo::LeadingScale );
+        d_wheel->setOrientation( Qt::Vertical );
+    }
+    else
+    {
+        d_thermo->setScalePosition( QwtThermo::TrailingScale );
+        d_wheel->setOrientation( Qt::Horizontal );
+    }
+
+    switch( type )
+    {
+        case 0:
+        {
+            QwtLinearColorMap *colorMap = new QwtLinearColorMap(); 
+            colorMap->setColorInterval( Qt::blue, Qt::red );
+            d_thermo->setColorMap( colorMap );
+
+            break;
+        }
+        case 1:
+        {
+            QwtLinearColorMap *colorMap = new QwtLinearColorMap();
+            colorMap->setMode( QwtLinearColorMap::FixedColors );
+
+            int idx = 4;
+
+            colorMap->setColorInterval( Qt::GlobalColor( idx ),
+                Qt::GlobalColor( idx + 10 ) );
+            for ( int i = 1; i < 10; i++ )
+            {
+                colorMap->addColorStop( i / 10.0, 
+                    Qt::GlobalColor( idx + i ) );
+            }
+
+            d_thermo->setColorMap( colorMap );
+            break;
+        }
+        case 2:
+        {
+            d_wheel->setRange( 10, 1000 );
+            d_wheel->setSingleStep( 1.0 );
+
+            d_thermo->setScaleEngine( new QwtLogScaleEngine );
+            d_thermo->setScaleMaxMinor( 10 );
+
+            d_thermo->setFillBrush( Qt::darkCyan );
+            d_thermo->setAlarmBrush( Qt::magenta );
+            d_thermo->setAlarmLevel( 500.0 );
+
+            d_wheel->setValue( 800 );
+
+            break;
+        }
+        case 3:
+        {
+            d_wheel->setRange( -1000, 1000 );
+            d_wheel->setSingleStep( 1.0 );
+            d_wheel->setPalette( QColor( "Tan" ) );
+
+            QwtLinearScaleEngine *scaleEngine = new QwtLinearScaleEngine();
+            scaleEngine->setTransformation( new QwtPowerTransform( 2 ) );
+
+            d_thermo->setScaleMaxMinor( 5 );
+            d_thermo->setScaleEngine( scaleEngine );
+
+            QPalette pal = palette();
+            pal.setColor( QPalette::Base, Qt::darkGray );
+            pal.setColor( QPalette::ButtonText, QColor( "darkKhaki" ) );
+
+            d_thermo->setPalette( pal );
+            break;
+        }
+        case 4:
+        {
+            d_wheel->setRange( -100, 300 );
+            d_wheel->setInverted( true );
+
+            QwtLinearColorMap *colorMap = new QwtLinearColorMap(); 
+            colorMap->setColorInterval( Qt::darkCyan, Qt::yellow );
+            d_thermo->setColorMap( colorMap );
+
+            d_wheel->setValue( 243 );
+
+            break;
+        }
+        case 5:
+        {
+            d_thermo->setFillBrush( Qt::darkCyan );
+            d_thermo->setAlarmBrush( Qt::magenta );
+            d_thermo->setAlarmLevel( 60.0 );
+
+            break;
+        }
+        case 6:
+        {
+            d_thermo->setOriginMode( QwtThermo::OriginMinimum );
+            d_thermo->setFillBrush( QBrush( "DarkSlateBlue" ) );
+            d_thermo->setAlarmBrush( QBrush( "DarkOrange" ) );
+            d_thermo->setAlarmLevel( 60.0 );
+
+            break;
+        }
+        case 7:
+        {
+            d_wheel->setRange( -100, 100 );
+
+            d_thermo->setOriginMode( QwtThermo::OriginCustom );
+            d_thermo->setOrigin( 0.0 );
+            d_thermo->setFillBrush( Qt::darkBlue );
+
+            break;
+        }
+    }
+
+    double min = d_wheel->minimum();
+    double max = d_wheel->maximum();
+
+    if ( d_wheel->isInverted() )
+        qSwap( min, max );
+
+    d_thermo->setScale( min, max );
+    d_thermo->setValue( d_wheel->value() );
+
+    connect( d_wheel, SIGNAL( valueChanged( double ) ), 
+        d_thermo, SLOT( setValue( double ) ) );
+
+    QWidget *box = new QWidget();
+
+    QBoxLayout *layout;
+
+    if ( orientation == Qt::Horizontal )
+        layout = new QHBoxLayout( box );
+    else
+        layout = new QVBoxLayout( box );
+
+    layout->addWidget( d_thermo, Qt::AlignCenter );
+    layout->addWidget( d_wheel );
+
+    return box;
+}
+
+void WheelBox::setNum( double v )
+{
+    QString text;
+    text.setNum( v, 'f', 2 );
+
+    d_label->setText( text );
+}

examples/controls/wheelbox.h

@@ -0,0 +1,29 @@
+#ifndef _WHEEL_BOX_H_
+#define _WHEEL_BOX_H_ 1
+
+#include <qwidget.h>
+
+class QLabel;
+class QwtThermo;
+class QwtWheel;
+
+class WheelBox: public QWidget
+{
+    Q_OBJECT
+public:
+    WheelBox( Qt::Orientation, 
+        int type, QWidget *parent = NULL );
+
+private Q_SLOTS:
+    void setNum( double v );
+
+private:
+    QWidget *createBox( Qt::Orientation, int type );
+
+private:
+    QwtWheel *d_wheel;
+    QwtThermo *d_thermo;
+    QLabel *d_label;
+};
+
+#endif

examples/controls/wheeltab.cpp

@@ -0,0 +1,28 @@
+#include "wheeltab.h"
+#include "wheelbox.h"
+#include <qlayout.h>
+
+WheelTab::WheelTab( QWidget *parent ):
+    QWidget( parent )
+{
+    const int numBoxes = 4;
+
+    QGridLayout *layout1 = new QGridLayout();
+    for ( int i = 0; i < numBoxes; i++ )
+    {
+        WheelBox *box = new WheelBox( Qt::Vertical, i );
+        layout1->addWidget( box, i / 2, i % 2 );
+    }
+
+    QGridLayout *layout2 = new QGridLayout();
+    for ( int i = 0; i < numBoxes; i++ )
+    {
+        WheelBox *box = new WheelBox( Qt::Horizontal, i + numBoxes );
+        layout2->addWidget( box, i / 2, i % 2 );
+    }
+
+    QHBoxLayout *layout = new QHBoxLayout( this );
+    layout->addLayout( layout1, 2 );
+    layout->addLayout( layout2, 5 );
+}
+

examples/controls/wheeltab.h

@@ -0,0 +1,12 @@
+#ifndef _WHEEL_TAB_H
+#define _WHEEL_TAB_H 1
+
+#include <qwidget.h>
+
+class WheelTab: public QWidget
+{
+public:
+    WheelTab( QWidget *parent = NULL );
+};
+
+#endif

examples/cpuplot/cpupiemarker.cpp

@@ -0,0 +1,54 @@
+#include <qpainter.h>
+#include <qwt_scale_map.h>
+#include <qwt_plot_curve.h>
+#include "cpuplot.h"
+#include "cpupiemarker.h"
+
+CpuPieMarker::CpuPieMarker()
+{
+    setZ( 1000 );
+    setRenderHint( QwtPlotItem::RenderAntialiased, true );
+}
+
+int CpuPieMarker::rtti() const
+{
+    return QwtPlotItem::Rtti_PlotUserItem;
+}
+
+void CpuPieMarker::draw( QPainter *painter,
+    const QwtScaleMap &, const QwtScaleMap &,
+    const QRectF &rect ) const
+{
+    const CpuPlot *cpuPlot = static_cast<CpuPlot *> ( plot() );
+
+    const QwtScaleMap yMap = cpuPlot->canvasMap( QwtPlot::yLeft );
+
+    const int margin = 5;
+
+    QRectF pieRect;
+    pieRect.setX( rect.x() + margin );
+    pieRect.setY( rect.y() + margin );
+    pieRect.setHeight( yMap.transform( 80.0 ) );
+    pieRect.setWidth( pieRect.height() );
+
+    const int dataType[] = { CpuPlot::User, CpuPlot::System, CpuPlot::Idle };
+
+    int angle = static_cast<int>( 5760 * 0.75 );
+    for ( unsigned int i = 0;
+        i < sizeof( dataType ) / sizeof( dataType[0] ); i++ )
+    {
+        const QwtPlotCurve *curve = cpuPlot->cpuCurve( dataType[i] );
+        if ( curve->dataSize() > 0 )
+        {
+            const int value = static_cast<int>( 5760 * curve->sample( 0 ).y() / 100.0 );
+
+            painter->save();
+            painter->setBrush( QBrush( curve->brush().color(), Qt::SolidPattern ) );
+            if ( value != 0 )
+                painter->drawPie( pieRect, -angle, -value );
+            painter->restore();
+
+            angle += value;
+        }
+    }
+}

examples/cpuplot/cpupiemarker.h

@@ -0,0 +1,17 @@
+//-----------------------------------------------------------------
+// This class shows how to extend QwtPlotItems. It displays a
+// pie chart of user/total/idle cpu usage in percent.
+//-----------------------------------------------------------------
+
+#include <qwt_plot_item.h>
+
+class CpuPieMarker: public QwtPlotItem
+{
+public:
+    CpuPieMarker();
+
+    virtual int rtti() const;
+
+    virtual void draw( QPainter *,
+        const QwtScaleMap &, const QwtScaleMap &, const QRectF & ) const;
+};

examples/cpuplot/cpuplot.cpp

@@ -0,0 +1,254 @@
+#include <qapplication.h>
+#include <qlayout.h>
+#include <qlabel.h>
+#include <qpainter.h>
+#include <qwt_plot_layout.h>
+#include <qwt_plot_curve.h>
+#include <qwt_scale_draw.h>
+#include <qwt_scale_widget.h>
+#include <qwt_legend.h>
+#include <qwt_legend_label.h>
+#include <qwt_plot_canvas.h>
+#include "cpupiemarker.h"
+#include "cpuplot.h"
+
+class TimeScaleDraw: public QwtScaleDraw
+{
+public:
+    TimeScaleDraw( const QTime &base ):
+        baseTime( base )
+    {
+    }
+    virtual QwtText label( double v ) const
+    {
+        QTime upTime = baseTime.addSecs( static_cast<int>( v ) );
+        return upTime.toString();
+    }
+private:
+    QTime baseTime;
+};
+
+class Background: public QwtPlotItem
+{
+public:
+    Background()
+    {
+        setZ( 0.0 );
+    }
+
+    virtual int rtti() const
+    {
+        return QwtPlotItem::Rtti_PlotUserItem;
+    }
+
+    virtual void draw( QPainter *painter,
+        const QwtScaleMap &, const QwtScaleMap &yMap,
+        const QRectF &canvasRect ) const
+    {
+        QColor c( Qt::white );
+        QRectF r = canvasRect;
+
+        for ( int i = 100; i > 0; i -= 10 )
+        {
+            r.setBottom( yMap.transform( i - 10 ) );
+            r.setTop( yMap.transform( i ) );
+            painter->fillRect( r, c );
+
+            c = c.dark( 110 );
+        }
+    }
+};
+
+class CpuCurve: public QwtPlotCurve
+{
+public:
+    CpuCurve( const QString &title ):
+        QwtPlotCurve( title )
+    {
+        setRenderHint( QwtPlotItem::RenderAntialiased );
+    }
+
+    void setColor( const QColor &color )
+    {
+        QColor c = color;
+        c.setAlpha( 150 );
+
+        setPen( QPen( Qt::NoPen ) );
+        setBrush( c );
+    }
+};
+
+CpuPlot::CpuPlot( QWidget *parent ):
+    QwtPlot( parent ),
+    dataCount( 0 )
+{
+    setAutoReplot( false );
+
+    QwtPlotCanvas *canvas = new QwtPlotCanvas();
+    canvas->setBorderRadius( 10 );
+
+    setCanvas( canvas );
+
+    plotLayout()->setAlignCanvasToScales( true );
+
+    QwtLegend *legend = new QwtLegend;
+    legend->setDefaultItemMode( QwtLegendData::Checkable );
+    insertLegend( legend, QwtPlot::RightLegend );
+
+    setAxisTitle( QwtPlot::xBottom, " System Uptime [h:m:s]" );
+    setAxisScaleDraw( QwtPlot::xBottom,
+        new TimeScaleDraw( cpuStat.upTime() ) );
+    setAxisScale( QwtPlot::xBottom, 0, HISTORY );
+    setAxisLabelRotation( QwtPlot::xBottom, -50.0 );
+    setAxisLabelAlignment( QwtPlot::xBottom, Qt::AlignLeft | Qt::AlignBottom );
+
+    /*
+     In situations, when there is a label at the most right position of the
+     scale, additional space is needed to display the overlapping part
+     of the label would be taken by reducing the width of scale and canvas.
+     To avoid this "jumping canvas" effect, we add a permanent margin.
+     We don't need to do the same for the left border, because there
+     is enough space for the overlapping label below the left scale.
+     */
+
+    QwtScaleWidget *scaleWidget = axisWidget( QwtPlot::xBottom );
+    const int fmh = QFontMetrics( scaleWidget->font() ).height();
+    scaleWidget->setMinBorderDist( 0, fmh / 2 );
+
+    setAxisTitle( QwtPlot::yLeft, "Cpu Usage [%]" );
+    setAxisScale( QwtPlot::yLeft, 0, 100 );
+
+    Background *bg = new Background();
+    bg->attach( this );
+
+    CpuPieMarker *pie = new CpuPieMarker();
+    pie->attach( this );
+
+    CpuCurve *curve;
+
+    curve = new CpuCurve( "System" );
+    curve->setColor( Qt::red );
+    curve->attach( this );
+    data[System].curve = curve;
+
+    curve = new CpuCurve( "User" );
+    curve->setColor( Qt::blue );
+    curve->setZ( curve->z() - 1 );
+    curve->attach( this );
+    data[User].curve = curve;
+
+    curve = new CpuCurve( "Total" );
+    curve->setColor( Qt::black );
+    curve->setZ( curve->z() - 2 );
+    curve->attach( this );
+    data[Total].curve = curve;
+
+    curve = new CpuCurve( "Idle" );
+    curve->setColor( Qt::darkCyan );
+    curve->setZ( curve->z() - 3 );
+    curve->attach( this );
+    data[Idle].curve = curve;
+
+    showCurve( data[System].curve, true );
+    showCurve( data[User].curve, true );
+    showCurve( data[Total].curve, false );
+    showCurve( data[Idle].curve, false );
+
+    for ( int i = 0; i < HISTORY; i++ )
+        timeData[HISTORY - 1 - i] = i;
+
+    ( void )startTimer( 1000 ); // 1 second
+
+    connect( legend, SIGNAL( checked( const QVariant &, bool, int ) ),
+        SLOT( legendChecked( const QVariant &, bool ) ) );
+}
+
+void CpuPlot::timerEvent( QTimerEvent * )
+{
+    for ( int i = dataCount; i > 0; i-- )
+    {
+        for ( int c = 0; c < NCpuData; c++ )
+        {
+            if ( i < HISTORY )
+                data[c].data[i] = data[c].data[i-1];
+        }
+    }
+
+    cpuStat.statistic( data[User].data[0], data[System].data[0] );
+
+    data[Total].data[0] = data[User].data[0] + data[System].data[0];
+    data[Idle].data[0] = 100.0 - data[Total].data[0];
+
+    if ( dataCount < HISTORY )
+        dataCount++;
+
+    for ( int j = 0; j < HISTORY; j++ )
+        timeData[j]++;
+
+    setAxisScale( QwtPlot::xBottom,
+        timeData[HISTORY - 1], timeData[0] );
+
+    for ( int c = 0; c < NCpuData; c++ )
+    {
+        data[c].curve->setRawSamples(
+            timeData, data[c].data, dataCount );
+    }
+
+    replot();
+}
+
+void CpuPlot::legendChecked( const QVariant &itemInfo, bool on )
+{
+    QwtPlotItem *plotItem = infoToItem( itemInfo );
+    if ( plotItem )
+        showCurve( plotItem, on );
+}
+
+void CpuPlot::showCurve( QwtPlotItem *item, bool on )
+{
+    item->setVisible( on );
+
+    QwtLegend *lgd = qobject_cast<QwtLegend *>( legend() );
+
+    QList<QWidget *> legendWidgets = 
+        lgd->legendWidgets( itemToInfo( item ) );
+
+    if ( legendWidgets.size() == 1 )
+    {
+        QwtLegendLabel *legendLabel =
+            qobject_cast<QwtLegendLabel *>( legendWidgets[0] );
+
+        if ( legendLabel )
+            legendLabel->setChecked( on );
+    }
+
+    replot();
+}
+
+int main( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    QWidget vBox;
+    vBox.setWindowTitle( "Cpu Plot" );
+
+    CpuPlot *plot = new CpuPlot( &vBox );
+    plot->setTitle( "History" );
+
+    const int margin = 5;
+    plot->setContentsMargins( margin, margin, margin, margin );
+
+    QString info( "Press the legend to en/disable a curve" );
+
+    QLabel *label = new QLabel( info, &vBox );
+
+    QVBoxLayout *layout = new QVBoxLayout( &vBox );
+    layout->addWidget( plot );
+    layout->addWidget( label );
+
+    vBox.resize( 600, 400 );
+    vBox.show();
+
+    return a.exec();
+}
+

examples/cpuplot/cpuplot.h

@@ -0,0 +1,47 @@
+#include <qwt_plot.h>
+#include "cpustat.h"
+
+#define HISTORY 60 // seconds
+
+class QwtPlotCurve;
+
+class CpuPlot : public QwtPlot
+{
+    Q_OBJECT
+public:
+    enum CpuData
+    {
+        User,
+        System,
+        Total,
+        Idle,
+
+        NCpuData
+    };
+
+    CpuPlot( QWidget * = 0 );
+    const QwtPlotCurve *cpuCurve( int id ) const
+    {
+        return data[id].curve;
+    }
+
+protected:
+    void timerEvent( QTimerEvent *e );
+
+private Q_SLOTS:
+    void legendChecked( const QVariant &, bool on );
+
+private:
+    void showCurve( QwtPlotItem *, bool on );
+
+    struct
+    {
+        QwtPlotCurve *curve;
+        double data[HISTORY];
+    } data[NCpuData];
+
+    double timeData[HISTORY];
+
+    int dataCount;
+    CpuStat cpuStat;
+};

examples/cpuplot/cpuplot.pro

@@ -0,0 +1,22 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET       = cpuplot
+
+HEADERS =  \
+    cpuplot.h \
+    cpustat.h \
+    cpupiemarker.h 
+
+SOURCES = \
+    cpuplot.cpp \
+    cpustat.cpp \
+    cpupiemarker.cpp 

examples/cpuplot/cpustat.cpp

@@ -0,0 +1,224 @@
+#include <qstringlist.h>
+#include <qfile.h>
+#include <qtextstream.h>
+#include "cpustat.h"
+
+CpuStat::CpuStat()
+{
+    lookUp( procValues );
+}
+
+QTime CpuStat::upTime() const
+{
+    QTime t( 0, 0, 0 );
+    for ( int i = 0; i < NValues; i++ )
+        t = t.addSecs( int( procValues[i] / 100 ) );
+
+    return t;
+}
+
+void CpuStat::statistic( double &user, double &system )
+{
+    double values[NValues];
+
+    lookUp( values );
+
+    double userDelta = values[User] + values[Nice]
+        - procValues[User] - procValues[Nice];
+    double systemDelta = values[System] - procValues[System];
+
+    double totalDelta = 0;
+    for ( int i = 0; i < NValues; i++ )
+        totalDelta += values[i] - procValues[i];
+
+    user = userDelta / totalDelta * 100.0;
+    system = systemDelta / totalDelta * 100.0;
+
+    for ( int j = 0; j < NValues; j++ )
+        procValues[j] = values[j];
+}
+
+void CpuStat::lookUp( double values[NValues] ) const
+{
+    QFile file( "/proc/stat" );
+#if 1
+    if ( !file.open( QIODevice::ReadOnly ) )
+#else
+    if ( true )
+#endif
+    {
+        static double dummyValues[][NValues] =
+        {
+            { 103726, 0, 23484, 819556 },
+            { 103783, 0, 23489, 819604 },
+            { 103798, 0, 23490, 819688 },
+            { 103820, 0, 23490, 819766 },
+            { 103840, 0, 23493, 819843 },
+            { 103875, 0, 23499, 819902 },
+            { 103917, 0, 23504, 819955 },
+            { 103950, 0, 23508, 820018 },
+            { 103987, 0, 23510, 820079 },
+            { 104020, 0, 23513, 820143 },
+            { 104058, 0, 23514, 820204 },
+            { 104099, 0, 23520, 820257 },
+            { 104121, 0, 23525, 820330 },
+            { 104159, 0, 23530, 820387 },
+            { 104176, 0, 23534, 820466 },
+            { 104215, 0, 23538, 820523 },
+            { 104245, 0, 23541, 820590 },
+            { 104267, 0, 23545, 820664 },
+            { 104311, 0, 23555, 820710 },
+            { 104355, 0, 23565, 820756 },
+            { 104367, 0, 23567, 820842 },
+            { 104383, 0, 23572, 820921 },
+            { 104396, 0, 23577, 821003 },
+            { 104413, 0, 23579, 821084 },
+            { 104446, 0, 23588, 821142 },
+            { 104521, 0, 23594, 821161 },
+            { 104611, 0, 23604, 821161 },
+            { 104708, 0, 23607, 821161 },
+            { 104804, 0, 23611, 821161 },
+            { 104895, 0, 23620, 821161 },
+            { 104993, 0, 23622, 821161 },
+            { 105089, 0, 23626, 821161 },
+            { 105185, 0, 23630, 821161 },
+            { 105281, 0, 23634, 821161 },
+            { 105379, 0, 23636, 821161 },
+            { 105472, 0, 23643, 821161 },
+            { 105569, 0, 23646, 821161 },
+            { 105666, 0, 23649, 821161 },
+            { 105763, 0, 23652, 821161 },
+            { 105828, 0, 23661, 821187 },
+            { 105904, 0, 23666, 821206 },
+            { 105999, 0, 23671, 821206 },
+            { 106094, 0, 23676, 821206 },
+            { 106184, 0, 23686, 821206 },
+            { 106273, 0, 23692, 821211 },
+            { 106306, 0, 23700, 821270 },
+            { 106341, 0, 23703, 821332 },
+            { 106392, 0, 23709, 821375 },
+            { 106423, 0, 23715, 821438 },
+            { 106472, 0, 23721, 821483 },
+            { 106531, 0, 23727, 821517 },
+            { 106562, 0, 23732, 821582 },
+            { 106597, 0, 23736, 821643 },
+            { 106633, 0, 23737, 821706 },
+            { 106666, 0, 23742, 821768 },
+            { 106697, 0, 23744, 821835 },
+            { 106730, 0, 23748, 821898 },
+            { 106765, 0, 23751, 821960 },
+            { 106799, 0, 23754, 822023 },
+            { 106831, 0, 23758, 822087 },
+            { 106862, 0, 23761, 822153 },
+            { 106899, 0, 23763, 822214 },
+            { 106932, 0, 23766, 822278 },
+            { 106965, 0, 23768, 822343 },
+            { 107009, 0, 23771, 822396 },
+            { 107040, 0, 23775, 822461 },
+            { 107092, 0, 23780, 822504 },
+            { 107143, 0, 23787, 822546 },
+            { 107200, 0, 23795, 822581 },
+            { 107250, 0, 23803, 822623 },
+            { 107277, 0, 23810, 822689 },
+            { 107286, 0, 23810, 822780 },
+            { 107313, 0, 23817, 822846 },
+            { 107325, 0, 23818, 822933 },
+            { 107332, 0, 23818, 823026 },
+            { 107344, 0, 23821, 823111 },
+            { 107357, 0, 23821, 823198 },
+            { 107368, 0, 23823, 823284 },
+            { 107375, 0, 23824, 823377 },
+            { 107386, 0, 23825, 823465 },
+            { 107396, 0, 23826, 823554 },
+            { 107422, 0, 23830, 823624 },
+            { 107434, 0, 23831, 823711 },
+            { 107456, 0, 23835, 823785 },
+            { 107468, 0, 23838, 823870 },
+            { 107487, 0, 23840, 823949 },
+            { 107515, 0, 23843, 824018 },
+            { 107528, 0, 23846, 824102 },
+            { 107535, 0, 23851, 824190 },
+            { 107548, 0, 23853, 824275 },
+            { 107562, 0, 23857, 824357 },
+            { 107656, 0, 23863, 824357 },
+            { 107751, 0, 23868, 824357 },
+            { 107849, 0, 23870, 824357 },
+            { 107944, 0, 23875, 824357 },
+            { 108043, 0, 23876, 824357 },
+            { 108137, 0, 23882, 824357 },
+            { 108230, 0, 23889, 824357 },
+            { 108317, 0, 23902, 824357 },
+            { 108412, 0, 23907, 824357 },
+            { 108511, 0, 23908, 824357 },
+            { 108608, 0, 23911, 824357 },
+            { 108704, 0, 23915, 824357 },
+            { 108801, 0, 23918, 824357 },
+            { 108891, 0, 23928, 824357 },
+            { 108987, 0, 23932, 824357 },
+            { 109072, 0, 23943, 824361 },
+            { 109079, 0, 23943, 824454 },
+            { 109086, 0, 23944, 824546 },
+            { 109098, 0, 23950, 824628 },
+            { 109108, 0, 23955, 824713 },
+            { 109115, 0, 23957, 824804 },
+            { 109122, 0, 23958, 824896 },
+            { 109132, 0, 23959, 824985 },
+            { 109142, 0, 23961, 825073 },
+            { 109146, 0, 23962, 825168 },
+            { 109153, 0, 23964, 825259 },
+            { 109162, 0, 23966, 825348 },
+            { 109168, 0, 23969, 825439 },
+            { 109176, 0, 23971, 825529 },
+            { 109185, 0, 23974, 825617 },
+            { 109193, 0, 23977, 825706 },
+            { 109198, 0, 23978, 825800 },
+            { 109206, 0, 23978, 825892 },
+            { 109212, 0, 23981, 825983 },
+            { 109219, 0, 23981, 826076 },
+            { 109225, 0, 23981, 826170 },
+            { 109232, 0, 23984, 826260 },
+            { 109242, 0, 23984, 826350 },
+            { 109255, 0, 23986, 826435 },
+            { 109268, 0, 23987, 826521 },
+            { 109283, 0, 23990, 826603 },
+            { 109288, 0, 23991, 826697 },
+            { 109295, 0, 23993, 826788 },
+            { 109308, 0, 23994, 826874 },
+            { 109322, 0, 24009, 826945 },
+            { 109328, 0, 24011, 827037 },
+            { 109338, 0, 24012, 827126 },
+            { 109347, 0, 24012, 827217 },
+            { 109354, 0, 24017, 827305 },
+            { 109367, 0, 24017, 827392 },
+            { 109371, 0, 24019, 827486 },
+        };
+        static int counter = 0;
+
+        for ( int i = 0; i < NValues; i++ )
+            values[i] = dummyValues[counter][i];
+
+        counter = ( counter + 1 )
+            % ( sizeof( dummyValues ) / sizeof( dummyValues[0] ) );
+    }
+    else
+    {
+        QTextStream textStream( &file );
+        do
+        {
+            QString line = textStream.readLine();
+            line = line.trimmed();
+            if ( line.startsWith( "cpu " ) )
+            {
+                const QStringList valueList =
+                    line.split( " ",  QString::SkipEmptyParts );
+                if ( valueList.count() >= 5 )
+                {
+                    for ( int i = 0; i < NValues; i++ )
+                        values[i] = valueList[i+1].toDouble();
+                }
+                break;
+            }
+        }
+        while( !textStream.atEnd() );
+    }
+}

examples/cpuplot/cpustat.h

@@ -0,0 +1,23 @@
+#include <qdatetime.h>
+
+class CpuStat
+{
+public:
+    CpuStat();
+    void statistic( double &user, double &system );
+    QTime upTime() const;
+
+    enum Value
+    {
+        User,
+        Nice,
+        System,
+        Idle,
+
+        NValues
+    };
+
+private:
+    void lookUp( double[NValues] ) const;
+    double procValues[NValues];
+};

examples/curvdemo1/curvdemo1.cpp

@@ -0,0 +1,202 @@
+
+#include <qwt_scale_map.h>
+#include <qwt_plot_curve.h>
+#include <qwt_symbol.h>
+#include <qwt_math.h>
+#include <qcolor.h>
+#include <qpainter.h>
+#include <qapplication.h>
+#include <qframe.h>
+
+//------------------------------------------------------------
+//      curvdemo1
+//
+//  This example program features some of the different
+//  display styles of the QwtPlotCurve class
+//------------------------------------------------------------
+
+
+//
+//   Array Sizes
+//
+const int Size = 27;
+const int CurvCnt = 6;
+
+//
+//   Arrays holding the values
+//
+double xval[Size];
+double yval[Size];
+QwtScaleMap xMap;
+QwtScaleMap yMap;
+
+class MainWin : public QFrame
+{
+public:
+    MainWin();
+
+protected:
+    virtual void paintEvent( QPaintEvent * );
+    void drawContents( QPainter *p );
+
+private:
+    void shiftDown( QRect &rect, int offset ) const;
+
+    QwtPlotCurve d_curves[CurvCnt];
+};
+
+MainWin::MainWin()
+{
+    int i;
+
+    xMap.setScaleInterval( -0.5, 10.5 );
+    yMap.setScaleInterval( -1.1, 1.1 );
+
+    //
+    //  Frame style
+    //
+    setFrameStyle( QFrame::Box | QFrame::Raised );
+    setLineWidth( 2 );
+    setMidLineWidth( 3 );
+
+    //
+    // Calculate values
+    //
+    for( i = 0; i < Size; i++ )
+    {
+        xval[i] = double( i ) * 10.0 / double( Size - 1 );
+        yval[i] = qSin( xval[i] ) * qCos( 2.0 * xval[i] );
+    }
+
+    //
+    //  define curve styles
+    //
+    i = 0;
+
+    d_curves[i].setSymbol( new QwtSymbol( QwtSymbol::Cross, Qt::NoBrush,
+        QPen( Qt::black ), QSize( 5, 5 ) ) );
+    d_curves[i].setPen( Qt::darkGreen );
+    d_curves[i].setStyle( QwtPlotCurve::Lines );
+    d_curves[i].setCurveAttribute( QwtPlotCurve::Fitted );
+    i++;
+
+    d_curves[i].setSymbol( new QwtSymbol( QwtSymbol::Ellipse, Qt::yellow,
+        QPen( Qt::blue ), QSize( 5, 5 ) ) );
+    d_curves[i].setPen( Qt::red );
+    d_curves[i].setStyle( QwtPlotCurve::Sticks );
+    i++;
+
+    d_curves[i].setPen( Qt::darkBlue );
+    d_curves[i].setStyle( QwtPlotCurve::Lines );
+    i++;
+
+    d_curves[i].setPen( Qt::darkBlue );
+    d_curves[i].setStyle( QwtPlotCurve::Lines );
+    d_curves[i].setRenderHint( QwtPlotItem::RenderAntialiased );
+    i++;
+
+    d_curves[i].setPen( Qt::darkCyan );
+    d_curves[i].setStyle( QwtPlotCurve::Steps );
+    i++;
+
+    d_curves[i].setSymbol( new QwtSymbol( QwtSymbol::XCross, Qt::NoBrush,
+        QPen( Qt::darkMagenta ), QSize( 5, 5 ) ) );
+    d_curves[i].setStyle( QwtPlotCurve::NoCurve );
+    i++;
+
+
+    //
+    // attach data
+    //
+    for( i = 0; i < CurvCnt; i++ )
+        d_curves[i].setRawSamples( xval, yval, Size );
+}
+
+void MainWin::shiftDown( QRect &rect, int offset ) const
+{
+    rect.translate( 0, offset );
+}
+
+void MainWin::paintEvent( QPaintEvent *event )
+{
+    QFrame::paintEvent( event );
+
+    QPainter painter( this );
+    painter.setClipRect( contentsRect() );
+    drawContents( &painter );
+}
+
+
+//
+//  REDRAW CONTENTS
+//
+void MainWin::drawContents( QPainter *painter )
+{
+    int deltay, i;
+
+    QRect r = contentsRect();
+
+    deltay = r.height() / CurvCnt - 1;
+
+    r.setHeight( deltay );
+
+    //
+    //  draw curves
+    //
+    for ( i = 0; i < CurvCnt; i++ )
+    {
+        xMap.setPaintInterval( r.left(), r.right() );
+        yMap.setPaintInterval( r.top(), r.bottom() );
+
+        painter->setRenderHint( QPainter::Antialiasing,
+            d_curves[i].testRenderHint( QwtPlotItem::RenderAntialiased ) );
+        d_curves[i].draw( painter, xMap, yMap, r );
+
+        shiftDown( r, deltay );
+    }
+
+    //
+    // draw titles
+    //
+    r = contentsRect();     // reset r
+    painter->setFont( QFont( "Helvetica", 8 ) );
+
+    const int alignment = Qt::AlignTop | Qt::AlignHCenter;
+
+    painter->setPen( Qt::black );
+
+    painter->drawText( 0, r.top(), r.width(), painter->fontMetrics().height(),
+        alignment, "Style: Line/Fitted, Symbol: Cross" );
+    shiftDown( r, deltay );
+
+    painter->drawText( 0, r.top(), r.width(), painter->fontMetrics().height(),
+        alignment, "Style: Sticks, Symbol: Ellipse" );
+    shiftDown( r, deltay );
+
+    painter->drawText( 0 , r.top(), r.width(), painter->fontMetrics().height(),
+        alignment, "Style: Lines, Symbol: None" );
+    shiftDown( r, deltay );
+
+    painter->drawText( 0 , r.top(), r.width(), painter->fontMetrics().height(),
+        alignment, "Style: Lines, Symbol: None, Antialiased" );
+    shiftDown( r, deltay );
+
+    painter->drawText( 0, r.top(), r.width(), painter->fontMetrics().height(),
+        alignment, "Style: Steps, Symbol: None" );
+    shiftDown( r, deltay );
+
+    painter->drawText( 0, r.top(), r.width(), painter->fontMetrics().height(),
+        alignment, "Style: NoCurve, Symbol: XCross" );
+}
+
+int main ( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    MainWin w;
+
+    w.resize( 300, 600 );
+    w.show();
+
+    return a.exec();
+}

examples/curvdemo1/curvdemo1.pro

@@ -0,0 +1,15 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET  = curvdemo1
+
+SOURCES = \
+    curvdemo1.cpp

examples/dials/attitude_indicator.cpp

@@ -0,0 +1,127 @@
+#include "attitude_indicator.h"
+#include <qwt_point_polar.h>
+#include <qwt_round_scale_draw.h>
+#include <qevent.h>
+#include <qpainter.h>
+#include <qpolygon.h>
+
+AttitudeIndicatorNeedle::AttitudeIndicatorNeedle( const QColor &color )
+{
+    QPalette palette;
+    palette.setColor( QPalette::Text, color );
+    setPalette( palette );
+}
+
+void AttitudeIndicatorNeedle::drawNeedle( QPainter *painter,
+    double length, QPalette::ColorGroup colorGroup ) const
+{
+    double triangleSize = length * 0.1;
+    double pos = length - 2.0;
+
+    QPainterPath path;
+    path.moveTo( pos, 0 );
+    path.lineTo( pos - 2 * triangleSize, triangleSize );
+    path.lineTo( pos - 2 * triangleSize, -triangleSize );
+    path.closeSubpath();
+
+    painter->setBrush( palette().brush( colorGroup, QPalette::Text ) );
+    painter->drawPath( path );
+
+    double l = length - 2;
+    painter->setPen( QPen( palette().color( colorGroup, QPalette::Text ), 3 ) );
+    painter->drawLine( QPointF( 0.0, -l ), QPointF( 0.0, l ) );
+}
+
+AttitudeIndicator::AttitudeIndicator(
+    QWidget *parent ):
+    QwtDial( parent ),
+    d_gradient( 0.0 )
+{
+    QwtRoundScaleDraw *scaleDraw = new QwtRoundScaleDraw();
+    scaleDraw->enableComponent( QwtAbstractScaleDraw::Backbone, false );
+    scaleDraw->enableComponent( QwtAbstractScaleDraw::Labels, false );
+    setScaleDraw( scaleDraw );
+
+    setMode( RotateScale );
+    setWrapping( true );
+
+    setOrigin( 270.0 );
+
+    setScaleMaxMinor( 0 );
+    setScaleStepSize( 30.0 );
+    setScale( 0.0, 360.0 );
+
+    const QColor color = palette().color( QPalette::Text );
+    setNeedle( new AttitudeIndicatorNeedle( color ) );
+}
+
+void AttitudeIndicator::setGradient( double gradient )
+{
+    if ( gradient < -1.0 )
+        gradient = -1.0;
+    else if ( gradient > 1.0 )
+        gradient = 1.0;
+
+    if ( d_gradient != gradient )
+    {
+        d_gradient = gradient;
+        update();
+    }
+}
+
+void AttitudeIndicator::drawScale( QPainter *painter, 
+    const QPointF &center, double radius ) const
+{
+    const double offset = 4.0;
+
+    const QPointF p0 = qwtPolar2Pos( center, offset, 1.5 * M_PI );
+
+    const double w = innerRect().width();
+
+    QPainterPath path;
+    path.moveTo( qwtPolar2Pos( p0, w, 0.0 ) );
+    path.lineTo( qwtPolar2Pos( path.currentPosition(), 2 * w, M_PI ) );
+    path.lineTo( qwtPolar2Pos( path.currentPosition(), w, 0.5 * M_PI ) );
+    path.lineTo( qwtPolar2Pos( path.currentPosition(), w, 0.0 ) );
+
+    painter->save();
+    painter->setClipPath( path ); // swallow 180 - 360 degrees
+
+    QwtDial::drawScale( painter, center, radius );
+
+    painter->restore();
+}
+
+void AttitudeIndicator::drawScaleContents( QPainter *painter,
+        const QPointF &, double ) const
+{
+    int dir = 360 - qRound( origin() - value() ); // counter clockwise
+    int arc = 90 + qRound( gradient() * 90 );
+
+    const QColor skyColor( 38, 151, 221 );
+
+    painter->save();
+    painter->setBrush( skyColor );
+    painter->drawChord( scaleInnerRect(),
+        ( dir - arc ) * 16, 2 * arc * 16 );
+    painter->restore();
+}
+
+void AttitudeIndicator::keyPressEvent( QKeyEvent *event )
+{
+    switch( event->key() )
+    {
+        case Qt::Key_Plus:
+        {
+            setGradient( gradient() + 0.05 );
+            break;
+        }
+        case Qt::Key_Minus:
+        {
+            setGradient( gradient() - 0.05 );
+            break;
+        }
+        default:
+            QwtDial::keyPressEvent( event );
+    }
+}

examples/dials/attitude_indicator.h

@@ -0,0 +1,39 @@
+#include <qwt_dial.h>
+#include <qwt_dial_needle.h>
+
+class AttitudeIndicatorNeedle: public QwtDialNeedle
+{
+public:
+    AttitudeIndicatorNeedle( const QColor & );
+
+protected:
+    virtual void drawNeedle( QPainter *,
+        double length, QPalette::ColorGroup ) const;
+};
+
+class AttitudeIndicator: public QwtDial
+{
+    Q_OBJECT
+
+public:
+    AttitudeIndicator( QWidget *parent = NULL );
+
+    double angle() const { return value(); }
+    double gradient() const { return d_gradient; }
+
+public Q_SLOTS:
+    void setGradient( double );
+    void setAngle( double angle ) { setValue( angle ); }
+
+protected:
+    virtual void keyPressEvent( QKeyEvent * );
+
+    virtual void drawScale( QPainter *, 
+        const QPointF &center, double radius ) const;
+
+    virtual void drawScaleContents( QPainter *painter,
+        const QPointF &center, double radius ) const;
+
+private:
+    double d_gradient;
+};

examples/dials/cockpit_grid.cpp

@@ -0,0 +1,186 @@
+#include <qlayout.h>
+#include <qtimer.h>
+#include <qwt_analog_clock.h>
+#include <qwt_round_scale_draw.h>
+#include "attitude_indicator.h"
+#include "speedo_meter.h"
+#include "cockpit_grid.h"
+
+CockpitGrid::CockpitGrid( QWidget *parent ):
+    QFrame( parent )
+{
+    setAutoFillBackground( true );
+
+    setPalette( colorTheme( QColor( Qt::darkGray ).dark( 150 ) ) );
+
+    QGridLayout *layout = new QGridLayout( this );
+    layout->setSpacing( 5 );
+    layout->setMargin( 0 );
+
+    int i;
+    for ( i = 0; i < 3; i++ )
+    {
+        QwtDial *dial = createDial( i );
+        layout->addWidget( dial, 0, i );
+    }
+
+    for ( i = 0; i < layout->columnCount(); i++ )
+        layout->setColumnStretch( i, 1 );
+}
+
+QwtDial *CockpitGrid::createDial( int pos )
+{
+    QwtDial *dial = NULL;
+    switch( pos )
+    {
+        case 0:
+        {
+            d_clock = new QwtAnalogClock( this );
+#if 0
+            // disable minor ticks
+            d_clock->scaleDraw()->setTickLength( QwtScaleDiv::MinorTick, 0 );
+#endif
+
+            const QColor knobColor = QColor( Qt::gray ).light( 130 );
+
+            for ( int i = 0; i < QwtAnalogClock::NHands; i++ )
+            {
+                QColor handColor = QColor( Qt::gray ).light( 150 );
+                int width = 8;
+
+                if ( i == QwtAnalogClock::SecondHand )
+                {
+                    handColor = Qt::gray;
+                    width = 5;
+                }
+
+                QwtDialSimpleNeedle *hand = new QwtDialSimpleNeedle(
+                    QwtDialSimpleNeedle::Arrow, true, handColor, knobColor );
+                hand->setWidth( width );
+
+                d_clock->setHand( static_cast<QwtAnalogClock::Hand>( i ), hand );
+            }
+
+            QTimer *timer = new QTimer( d_clock );
+            timer->connect( timer, SIGNAL( timeout() ),
+                d_clock, SLOT( setCurrentTime() ) );
+            timer->start( 1000 );
+
+            dial = d_clock;
+            break;
+        }
+        case 1:
+        {
+            d_speedo = new SpeedoMeter( this );
+            d_speedo->setScaleStepSize( 20.0 );
+            d_speedo->setScale( 0.0, 240.0 );
+            d_speedo->scaleDraw()->setPenWidth( 2 );
+
+            QTimer *timer = new QTimer( d_speedo );
+            timer->connect( timer, SIGNAL( timeout() ),
+                this, SLOT( changeSpeed() ) );
+            timer->start( 50 );
+
+            dial = d_speedo;
+            break;
+        }
+        case 2:
+        {
+            d_ai = new AttitudeIndicator( this );
+            d_ai->scaleDraw()->setPenWidth( 3 );
+
+            QTimer *gradientTimer = new QTimer( d_ai );
+            gradientTimer->connect( gradientTimer, SIGNAL( timeout() ),
+                this, SLOT( changeGradient() ) );
+            gradientTimer->start( 100 );
+
+            QTimer *angleTimer = new QTimer( d_ai );
+            angleTimer->connect( angleTimer, SIGNAL( timeout() ),
+                this, SLOT( changeAngle() ) );
+            angleTimer->start( 100 );
+
+            dial = d_ai;
+            break;
+        }
+
+    }
+
+    if ( dial )
+    {
+        dial->setReadOnly( true );
+        dial->setLineWidth( 4 );
+        dial->setFrameShadow( QwtDial::Sunken );
+    }
+    return dial;
+}
+
+QPalette CockpitGrid::colorTheme( const QColor &base ) const
+{
+    QPalette palette;
+    palette.setColor( QPalette::Base, base );
+    palette.setColor( QPalette::Window, base.dark( 150 ) );
+    palette.setColor( QPalette::Mid, base.dark( 110 ) );
+    palette.setColor( QPalette::Light, base.light( 170 ) );
+    palette.setColor( QPalette::Dark, base.dark( 170 ) );
+    palette.setColor( QPalette::Text, base.dark( 200 ).light( 800 ) );
+    palette.setColor( QPalette::WindowText, base.dark( 200 ) );
+
+    return palette;
+}
+
+void CockpitGrid::changeSpeed()
+{
+    static double offset = 0.8;
+
+    double speed = d_speedo->value();
+
+    if ( ( speed < 7.0 && offset < 0.0 ) ||
+        ( speed > 203.0 && offset > 0.0 ) )
+    {
+        offset = -offset;
+    }
+
+    static int counter = 0;
+    switch( counter++ % 12 )
+    {
+        case 0:
+        case 2:
+        case 7:
+        case 8:
+            break;
+        default:
+            d_speedo->setValue( speed + offset );
+    }
+}
+
+void CockpitGrid::changeAngle()
+{
+    static double offset = 0.05;
+
+    double angle = d_ai->angle();
+    if ( angle > 180.0 )
+        angle -= 360.0;
+
+    if ( ( angle < -5.0 && offset < 0.0 ) ||
+        ( angle > 5.0 && offset > 0.0 ) )
+    {
+        offset = -offset;
+    }
+
+    d_ai->setAngle( angle + offset );
+}
+
+void CockpitGrid::changeGradient()
+{
+    static double offset = 0.005;
+
+    double gradient = d_ai->gradient();
+
+    if ( ( gradient < -0.05 && offset < 0.0 ) ||
+        ( gradient > 0.05 && offset > 0.0 ) )
+    {
+        offset = -offset;
+    }
+
+    d_ai->setGradient( gradient + offset );
+}

examples/dials/cockpit_grid.h

@@ -0,0 +1,28 @@
+#include <qframe.h>
+#include <qpalette.h>
+
+class QwtDial;
+class QwtAnalogClock;
+class SpeedoMeter;
+class AttitudeIndicator;
+
+class CockpitGrid: public QFrame
+{
+    Q_OBJECT
+
+public:
+    CockpitGrid( QWidget *parent = NULL );
+
+private Q_SLOTS:
+    void changeSpeed();
+    void changeGradient();
+    void changeAngle();
+
+private:
+    QPalette colorTheme( const QColor & ) const;
+    QwtDial *createDial( int pos );
+
+    QwtAnalogClock *d_clock;
+    SpeedoMeter *d_speedo;
+    AttitudeIndicator *d_ai;
+};

examples/dials/compass_grid.cpp

@@ -0,0 +1,226 @@
+#include <qlayout.h>
+#include <qwt_compass.h>
+#include <qwt_compass_rose.h>
+#include <qwt_dial_needle.h>
+#include "compass_grid.h"
+
+CompassGrid::CompassGrid( QWidget *parent ):
+    QFrame( parent )
+{
+    QPalette p = palette();
+    p.setColor( backgroundRole(), Qt::gray );
+    setPalette( p );
+
+    setAutoFillBackground( true );
+
+    QGridLayout *layout = new QGridLayout( this );
+    layout->setSpacing( 5 );
+    layout->setMargin( 0 );
+
+    int i;
+    for ( i = 0; i < 6; i++ )
+    {
+        QwtCompass *compass = createCompass( i );
+        layout->addWidget( compass, i / 3, i % 3 );
+    }
+
+    for ( i = 0; i < layout->columnCount(); i++ )
+        layout->setColumnStretch( i, 1 );
+}
+
+QwtCompass *CompassGrid::createCompass( int pos )
+{
+    int c;
+
+    QPalette palette0;
+    for ( c = 0; c < QPalette::NColorRoles; c++ )
+    {
+        const QPalette::ColorRole colorRole =
+            static_cast<QPalette::ColorRole>( c );
+
+        palette0.setColor( colorRole, QColor() );
+    }
+
+    palette0.setColor( QPalette::Base,
+        palette().color( backgroundRole() ).light( 120 ) );
+    palette0.setColor( QPalette::WindowText,
+        palette0.color( QPalette::Base ) );
+
+    QwtCompass *compass = new QwtCompass( this );
+    compass->setLineWidth( 4 );
+    compass->setFrameShadow(
+        pos <= 2 ? QwtCompass::Sunken : QwtCompass::Raised );
+
+    switch( pos )
+    {
+        case 0:
+        {
+            /*
+              A compass with a rose and no needle. Scale and rose are
+              rotating.
+             */
+            compass->setMode( QwtCompass::RotateScale );
+
+            QwtSimpleCompassRose *rose = new QwtSimpleCompassRose( 16, 2 );
+            rose->setWidth( 0.15 );
+
+            compass->setRose( rose );
+            break;
+        }
+        case 1:
+        {
+            /*
+              A windrose, with a scale indicating the main directions only
+             */
+            QMap<double, QString> map;
+            map.insert( 0.0, "N" );
+            map.insert( 90.0, "E" );
+            map.insert( 180.0, "S" );
+            map.insert( 270.0, "W" );
+
+            compass->setScaleDraw( new QwtCompassScaleDraw( map ) );
+
+            QwtSimpleCompassRose *rose = new QwtSimpleCompassRose( 4, 1 );
+            compass->setRose( rose );
+
+            compass->setNeedle(
+                new QwtCompassWindArrow( QwtCompassWindArrow::Style2 ) );
+            compass->setValue( 60.0 );
+            break;
+        }
+        case 2:
+        {
+            /*
+              A compass with a rotating needle in darkBlue. Shows
+              a ticks for each degree.
+             */
+
+            palette0.setColor( QPalette::Base, Qt::darkBlue );
+            palette0.setColor( QPalette::WindowText,
+                               QColor( Qt::darkBlue ).dark( 120 ) );
+            palette0.setColor( QPalette::Text, Qt::white );
+
+            QwtCompassScaleDraw *scaleDraw = new QwtCompassScaleDraw();
+            scaleDraw->enableComponent( QwtAbstractScaleDraw::Ticks, true );
+            scaleDraw->enableComponent( QwtAbstractScaleDraw::Labels, true );
+            scaleDraw->enableComponent( QwtAbstractScaleDraw::Backbone, false );
+            scaleDraw->setTickLength( QwtScaleDiv::MinorTick, 1 );
+            scaleDraw->setTickLength( QwtScaleDiv::MediumTick, 1 );
+            scaleDraw->setTickLength( QwtScaleDiv::MajorTick, 3 );
+
+            compass->setScaleDraw( scaleDraw );
+
+            compass->setScaleMaxMajor( 36 );
+            compass->setScaleMaxMinor( 5 );
+
+            compass->setNeedle(
+                new QwtCompassMagnetNeedle( QwtCompassMagnetNeedle::ThinStyle ) );
+            compass->setValue( 220.0 );
+
+            break;
+        }
+        case 3:
+        {
+            /*
+              A compass without a frame, showing numbers as tick labels.
+              The origin is at 220.0
+             */
+            palette0.setColor( QPalette::Base,
+                palette().color( backgroundRole() ) );
+            palette0.setColor( QPalette::WindowText, Qt::blue );
+
+            compass->setLineWidth( 0 );
+
+            QMap<double, QString> map;
+            for ( double d = 0.0; d < 360.0; d += 60.0 )
+            {
+                QString label;
+                label.sprintf( "%.0f", d );
+                map.insert( d, label );
+            }
+
+            QwtCompassScaleDraw *scaleDraw = 
+                new QwtCompassScaleDraw( map );
+            scaleDraw->enableComponent( QwtAbstractScaleDraw::Ticks, true );
+            scaleDraw->enableComponent( QwtAbstractScaleDraw::Labels, true );
+            scaleDraw->enableComponent( QwtAbstractScaleDraw::Backbone, true );
+            scaleDraw->setTickLength( QwtScaleDiv::MinorTick, 0 );
+            scaleDraw->setTickLength( QwtScaleDiv::MediumTick, 0 );
+            scaleDraw->setTickLength( QwtScaleDiv::MajorTick, 3 );
+
+            compass->setScaleDraw( scaleDraw );
+
+            compass->setScaleMaxMajor( 36 );
+            compass->setScaleMaxMinor( 5 );
+
+            compass->setNeedle( new QwtDialSimpleNeedle( QwtDialSimpleNeedle::Ray,
+                true, Qt::white ) );
+            compass->setOrigin( 220.0 );
+            compass->setValue( 20.0 );
+            break;
+        }
+        case 4:
+        {
+            /*
+             A compass showing another needle
+             */
+            QwtCompassScaleDraw *scaleDraw = new QwtCompassScaleDraw();
+            scaleDraw->enableComponent( QwtAbstractScaleDraw::Ticks, true );
+            scaleDraw->enableComponent( QwtAbstractScaleDraw::Labels, true );
+            scaleDraw->enableComponent( QwtAbstractScaleDraw::Backbone, false );
+            scaleDraw->setTickLength( QwtScaleDiv::MinorTick, 0 );
+            scaleDraw->setTickLength( QwtScaleDiv::MediumTick, 0 );
+            scaleDraw->setTickLength( QwtScaleDiv::MajorTick, 3 );
+
+            compass->setScaleDraw( scaleDraw );
+
+            compass->setNeedle( new QwtCompassMagnetNeedle(
+                QwtCompassMagnetNeedle::TriangleStyle, Qt::white, Qt::red ) );
+            compass->setValue( 220.0 );
+            break;
+        }
+        case 5:
+        {
+            /*
+             A compass with a yellow on black ray
+             */
+            palette0.setColor( QPalette::WindowText, Qt::black );
+
+            compass->setNeedle( new QwtDialSimpleNeedle( QwtDialSimpleNeedle::Ray,
+                false, Qt::yellow ) );
+            compass->setValue( 315.0 );
+            break;
+        }
+    }
+
+    QPalette newPalette = compass->palette();
+    for ( c = 0; c < QPalette::NColorRoles; c++ )
+    {
+        const QPalette::ColorRole colorRole =
+            static_cast<QPalette::ColorRole>( c );
+
+        if ( palette0.color( colorRole ).isValid() )
+            newPalette.setColor( colorRole, palette0.color( colorRole ) );
+    }
+
+    for ( int i = 0; i < QPalette::NColorGroups; i++ )
+    {
+        const QPalette::ColorGroup colorGroup =
+            static_cast<QPalette::ColorGroup>( i );
+
+        const QColor light =
+            newPalette.color( colorGroup, QPalette::Base ).light( 170 );
+        const QColor dark = newPalette.color( colorGroup, QPalette::Base ).dark( 170 );
+        const QColor mid = compass->frameShadow() == QwtDial::Raised
+            ? newPalette.color( colorGroup, QPalette::Base ).dark( 110 )
+            : newPalette.color( colorGroup, QPalette::Base ).light( 110 );
+
+        newPalette.setColor( colorGroup, QPalette::Dark, dark );
+        newPalette.setColor( colorGroup, QPalette::Mid, mid );
+        newPalette.setColor( colorGroup, QPalette::Light, light );
+    }
+
+    compass->setPalette( newPalette );
+
+    return compass;
+}

examples/dials/compass_grid.h

@@ -0,0 +1,11 @@
+#include <qframe.h>
+class QwtCompass;
+
+class CompassGrid: public QFrame
+{
+public:
+    CompassGrid( QWidget *parent = NULL );
+
+private:
+    QwtCompass *createCompass( int pos );
+};

examples/dials/dials.cpp

@@ -0,0 +1,24 @@
+#include <qapplication.h>
+#include <qtabwidget.h>
+#include "compass_grid.h"
+#include "cockpit_grid.h"
+
+//-----------------------------------------------------------------
+//
+//      dials.cpp -- A demo program featuring QwtDial and friends
+//
+//-----------------------------------------------------------------
+
+int main ( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    QTabWidget tabWidget;
+    tabWidget.addTab( new CompassGrid, "Compass" );
+    tabWidget.addTab( new CockpitGrid, "Cockpit" );
+
+    tabWidget.show();
+
+    return a.exec();
+}
+

examples/dials/dials.pro

@@ -0,0 +1,26 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET       = dials
+
+HEADERS = \
+    attitude_indicator.h \
+    speedo_meter.h \
+    cockpit_grid.h \
+    compass_grid.h
+
+SOURCES = \
+    attitude_indicator.cpp \
+    speedo_meter.cpp \
+    cockpit_grid.cpp \
+    compass_grid.cpp \
+    dials.cpp
+

examples/dials/speedo_meter.cpp

@@ -0,0 +1,52 @@
+#include <qpainter.h>
+#include <qwt_dial_needle.h>
+#include <qwt_round_scale_draw.h>
+#include "speedo_meter.h"
+
+SpeedoMeter::SpeedoMeter( QWidget *parent ):
+    QwtDial( parent ),
+    d_label( "km/h" )
+{
+    QwtRoundScaleDraw *scaleDraw = new QwtRoundScaleDraw();
+    scaleDraw->setSpacing( 8 );
+    scaleDraw->enableComponent( QwtAbstractScaleDraw::Backbone, false );
+    scaleDraw->setTickLength( QwtScaleDiv::MinorTick, 0 );
+    scaleDraw->setTickLength( QwtScaleDiv::MediumTick, 4 );
+    scaleDraw->setTickLength( QwtScaleDiv::MajorTick, 8 );
+    setScaleDraw( scaleDraw );
+
+    setWrapping( false );
+    setReadOnly( true );
+
+    setOrigin( 135.0 );
+    setScaleArc( 0.0, 270.0 );
+
+    QwtDialSimpleNeedle *needle = new QwtDialSimpleNeedle(
+        QwtDialSimpleNeedle::Arrow, true, Qt::red,
+        QColor( Qt::gray ).light( 130 ) );
+    setNeedle( needle );
+}
+
+void SpeedoMeter::setLabel( const QString &label )
+{
+    d_label = label;
+    update();
+}
+
+QString SpeedoMeter::label() const
+{
+    return d_label;
+}
+
+void SpeedoMeter::drawScaleContents( QPainter *painter,
+    const QPointF &center, double radius ) const
+{
+    QRectF rect( 0.0, 0.0, 2.0 * radius, 2.0 * radius - 10.0 );
+    rect.moveCenter( center );
+
+    const QColor color = palette().color( QPalette::Text );
+    painter->setPen( color );
+
+    const int flags = Qt::AlignBottom | Qt::AlignHCenter;
+    painter->drawText( rect, flags, d_label );
+}

examples/dials/speedo_meter.h

@@ -0,0 +1,18 @@
+#include <qstring.h>
+#include <qwt_dial.h>
+
+class SpeedoMeter: public QwtDial
+{
+public:
+    SpeedoMeter( QWidget *parent = NULL );
+
+    void setLabel( const QString & );
+    QString label() const;
+
+protected:
+    virtual void drawScaleContents( QPainter *painter,
+        const QPointF &center, double radius ) const;
+
+private:
+    QString d_label;
+};

examples/distrowatch/barchart.cpp

@@ -0,0 +1,196 @@
+#include "barchart.h"
+#include <qwt_plot_renderer.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_barchart.h>
+#include <qwt_column_symbol.h>
+#include <qwt_plot_layout.h>
+#include <qwt_legend.h>
+#include <qwt_scale_draw.h>
+
+class DistroScaleDraw: public QwtScaleDraw
+{
+public:
+    DistroScaleDraw( Qt::Orientation orientation, const QStringList &labels ):
+        d_labels( labels )
+    {
+        setTickLength( QwtScaleDiv::MinorTick, 0 );
+        setTickLength( QwtScaleDiv::MediumTick, 0 );
+        setTickLength( QwtScaleDiv::MajorTick, 2 );
+
+        enableComponent( QwtScaleDraw::Backbone, false );
+
+        if ( orientation == Qt::Vertical )
+        {
+            setLabelRotation( -60.0 );
+        }
+        else
+        {
+            setLabelRotation( -20.0 );
+        }
+
+        setLabelAlignment( Qt::AlignLeft | Qt::AlignVCenter );
+    }
+
+    virtual QwtText label( double value ) const
+    {
+        QwtText lbl;
+
+        const int index = qRound( value );
+        if ( index >= 0 && index < d_labels.size() )
+        {
+            lbl = d_labels[ index ];
+        }
+            
+        return lbl;
+    }
+
+private:
+    const QStringList d_labels;
+};
+
+class DistroChartItem: public QwtPlotBarChart
+{
+public:
+    DistroChartItem():
+        QwtPlotBarChart( "Page Hits" )
+    {
+        setLegendMode( QwtPlotBarChart::LegendBarTitles );
+        setLegendIconSize( QSize( 10, 14 ) );
+        setLayoutPolicy( AutoAdjustSamples );
+        setLayoutHint( 4.0 ); // minimum width for a single bar
+
+        setSpacing( 10 ); // spacing between bars
+    }
+
+    void addDistro( const QString &distro, const QColor &color )
+    {
+        d_colors += color;
+        d_distros += distro;
+        itemChanged();
+    }
+
+    virtual QwtColumnSymbol *specialSymbol(
+        int index, const QPointF& ) const
+    {
+        // we want to have individual colors for each bar
+
+        QwtColumnSymbol *symbol = new QwtColumnSymbol( QwtColumnSymbol::Box );
+        symbol->setLineWidth( 2 );
+        symbol->setFrameStyle( QwtColumnSymbol::Raised );
+
+        QColor c( Qt::white );
+        if ( index >= 0 && index < d_colors.size() )
+            c = d_colors[ index ];
+
+        symbol->setPalette( c );
+    
+        return symbol;
+    }
+
+    virtual QwtText barTitle( int sampleIndex ) const
+    {
+        QwtText title;
+        if ( sampleIndex >= 0 && sampleIndex < d_distros.size() )
+            title = d_distros[ sampleIndex ];
+
+        return title;
+    }
+
+private:
+    QList<QColor> d_colors;
+    QList<QString> d_distros;
+};
+
+BarChart::BarChart( QWidget *parent ):
+    QwtPlot( parent )
+{
+    const struct 
+    {
+        const char *distro;
+        const int hits;
+        QColor color;
+
+    } pageHits[] =
+    {
+        { "Arch", 1114, QColor( "DodgerBlue" ) },
+        { "Debian", 1373, QColor( "#d70751" ) },
+        { "Fedora", 1638, QColor( "SteelBlue" ) },
+        { "Mageia", 1395, QColor( "Indigo" ) },
+        { "Mint", 3874, QColor( 183, 255, 183 ) },
+        { "openSuSE", 1532, QColor( 115, 186, 37 ) },
+        { "Puppy", 1059, QColor( "LightSkyBlue" ) },
+        { "Ubuntu", 2391, QColor( "FireBrick" ) }
+    };
+
+    setAutoFillBackground( true );
+    setPalette( QColor( "Linen" ) );
+
+    QwtPlotCanvas *canvas = new QwtPlotCanvas();
+    canvas->setLineWidth( 2 );
+    canvas->setFrameStyle( QFrame::Box | QFrame::Sunken );
+    canvas->setBorderRadius( 10 );
+
+    QPalette canvasPalette( QColor( "Plum" ) );
+    canvasPalette.setColor( QPalette::Foreground, QColor( "Indigo" ) );
+    canvas->setPalette( canvasPalette );
+
+    setCanvas( canvas );
+
+    setTitle( "DistroWatch Page Hit Ranking, April 2012" );
+
+    d_barChartItem = new DistroChartItem();
+
+    QVector< double > samples;
+
+    for ( uint i = 0; i < sizeof( pageHits ) / sizeof( pageHits[ 0 ] ); i++ )
+    {
+        d_distros += pageHits[ i ].distro;
+        samples += pageHits[ i ].hits;
+
+        d_barChartItem->addDistro( 
+            pageHits[ i ].distro, pageHits[ i ].color );
+    }
+
+    d_barChartItem->setSamples( samples );
+
+    d_barChartItem->attach( this );
+
+    insertLegend( new QwtLegend() );
+
+    setOrientation( 0 );
+    setAutoReplot( false );
+}
+
+void BarChart::setOrientation( int o )
+{
+    const Qt::Orientation orientation =
+        ( o == 0 ) ? Qt::Vertical : Qt::Horizontal;
+
+    int axis1 = QwtPlot::xBottom;
+    int axis2 = QwtPlot::yLeft;
+
+    if ( orientation == Qt::Horizontal )
+        qSwap( axis1, axis2 );
+
+    d_barChartItem->setOrientation( orientation );
+
+    setAxisTitle( axis1, "Distros" );
+    setAxisMaxMinor( axis1, 3 );
+    setAxisScaleDraw( axis1, new DistroScaleDraw( orientation, d_distros ) );
+
+    setAxisTitle( axis2, "Hits per day ( HPD )" );
+    setAxisMaxMinor( axis2, 3 );
+
+    QwtScaleDraw *scaleDraw = new QwtScaleDraw();
+    scaleDraw->setTickLength( QwtScaleDiv::MediumTick, 4 );
+    setAxisScaleDraw( axis2, scaleDraw );
+
+    plotLayout()->setCanvasMargin( 0 );
+    replot();
+}
+
+void BarChart::exportChart()
+{
+    QwtPlotRenderer renderer;
+    renderer.exportTo( this, "distrowatch.pdf" );
+}

examples/distrowatch/barchart.h

@@ -0,0 +1,26 @@
+#ifndef _BAR_CHART_H_
+
+#include <qwt_plot.h>
+#include <qstringlist.h>
+
+class DistroChartItem;
+
+class BarChart: public QwtPlot
+{
+    Q_OBJECT
+
+public:
+    BarChart( QWidget * = NULL );
+
+public Q_SLOTS:
+    void setOrientation( int );
+    void exportChart();
+
+private:
+    void populate();
+
+    DistroChartItem *d_barChartItem;
+    QStringList d_distros;
+};
+
+#endif

examples/distrowatch/distrowatch.pro

@@ -0,0 +1,19 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET       = distrowatch
+
+HEADERS = \
+    barchart.h 
+
+SOURCES = \
+    barchart.cpp \
+    main.cpp

examples/distrowatch/main.cpp

@@ -0,0 +1,54 @@
+#include <qapplication.h>
+#include <qmainwindow.h>
+#include <qtoolbar.h>
+#include <qtoolbutton.h>
+#include <qcombobox.h>
+#include "barchart.h"
+
+class MainWindow: public QMainWindow
+{
+public:
+    MainWindow( QWidget * = NULL );
+
+private:
+    BarChart *d_chart;
+};
+
+MainWindow::MainWindow( QWidget *parent ):
+    QMainWindow( parent )
+{
+    d_chart = new BarChart( this );
+    setCentralWidget( d_chart );
+
+    QToolBar *toolBar = new QToolBar( this );
+
+    QComboBox *orientationBox = new QComboBox( toolBar );
+    orientationBox->addItem( "Vertical" );
+    orientationBox->addItem( "Horizontal" );
+    orientationBox->setSizePolicy( QSizePolicy::Fixed, QSizePolicy::Fixed );
+
+    QToolButton *btnExport = new QToolButton( toolBar );
+    btnExport->setText( "Export" );
+    btnExport->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+    connect( btnExport, SIGNAL( clicked() ), d_chart, SLOT( exportChart() ) );
+
+    toolBar->addWidget( orientationBox );
+    toolBar->addWidget( btnExport );
+    addToolBar( toolBar );
+
+    d_chart->setOrientation( orientationBox->currentIndex() );
+    connect( orientationBox, SIGNAL( currentIndexChanged( int ) ),
+             d_chart, SLOT( setOrientation( int ) ) );
+}
+
+int main( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    MainWindow mainWindow;
+
+    mainWindow.resize( 600, 400 );
+    mainWindow.show();
+
+    return a.exec();
+}

examples/event_filter/README

@@ -0,0 +1,27 @@
+QwtPlot is a composite widget consisting of a title label,
+the canvas, the scales and a legend. Although all components 
+should be exchangable some day, the current design isn´t ready for it.
+
+In this situation event filtering is the mechanism to extend the behaviour
+of the plot components. event_filter shows 3 examples how to use it:
+
+1) CanvasPicker
+
+The CanvasPicker implements a solution, how to move points on the canvas
+with mouse and keyboard. 
+
+2) ScalePicker
+
+The ScalePicker translates the position of mouse clicks on the scales
+and emits them as signals.
+
+3) Plot: ColorBar, QSlider
+
+The Plot class shows how to add widgets to the scales. In this example
+there is no filter class. The derived plot widget filters its components.
+
+
+Please note that CanvasPicker and ScalePicker are standalone classes
+that could be connected with your QwtPlot as well. 
+
+Uwe

examples/event_filter/canvaspicker.cpp

@@ -0,0 +1,372 @@
+#include <qapplication.h>
+#include <qevent.h>
+#include <qwhatsthis.h>
+#include <qpainter.h>
+#include <qwt_plot.h>
+#include <qwt_symbol.h>
+#include <qwt_scale_map.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_curve.h>
+#include <qwt_plot_directpainter.h>
+#include "canvaspicker.h"
+
+CanvasPicker::CanvasPicker( QwtPlot *plot ):
+    QObject( plot ),
+    d_selectedCurve( NULL ),
+    d_selectedPoint( -1 )
+{
+    QwtPlotCanvas *canvas = qobject_cast<QwtPlotCanvas *>( plot->canvas() );
+    canvas->installEventFilter( this );
+
+    // We want the focus, but no focus rect. The
+    // selected point will be highlighted instead.
+
+    canvas->setFocusPolicy( Qt::StrongFocus );
+#ifndef QT_NO_CURSOR
+    canvas->setCursor( Qt::PointingHandCursor );
+#endif
+    canvas->setFocusIndicator( QwtPlotCanvas::ItemFocusIndicator );
+    canvas->setFocus();
+
+    const char *text =
+        "All points can be moved using the left mouse button "
+        "or with these keys:\n\n"
+        "- Up:\t\tSelect next curve\n"
+        "- Down:\t\tSelect previous curve\n"
+        "- Left, ´-´:\tSelect next point\n"
+        "- Right, ´+´:\tSelect previous point\n"
+        "- 7, 8, 9, 4, 6, 1, 2, 3:\tMove selected point";
+    canvas->setWhatsThis( text );
+
+    shiftCurveCursor( true );
+}
+
+QwtPlot *CanvasPicker::plot()
+{
+    return qobject_cast<QwtPlot *>( parent() );
+}
+
+const QwtPlot *CanvasPicker::plot() const
+{
+    return qobject_cast<const QwtPlot *>( parent() );
+}
+
+bool CanvasPicker::event( QEvent *ev )
+{
+    if ( ev->type() == QEvent::User )
+    {
+        showCursor( true );
+        return true;
+    }
+    return QObject::event( ev );
+}
+
+bool CanvasPicker::eventFilter( QObject *object, QEvent *event )
+{
+    if ( plot() == NULL || object != plot()->canvas() )
+        return false;
+
+    switch( event->type() )
+    {
+        case QEvent::FocusIn:
+        {
+            showCursor( true );
+            break;
+        }
+        case QEvent::FocusOut:
+        {
+            showCursor( false );
+            break;
+        }
+        case QEvent::Paint:
+        {
+            QApplication::postEvent( this, new QEvent( QEvent::User ) );
+            break;
+        }
+        case QEvent::MouseButtonPress:
+        {
+            const QMouseEvent *mouseEvent = static_cast<QMouseEvent *>( event );
+            select( mouseEvent->pos() );
+            return true;
+        }
+        case QEvent::MouseMove:
+        {
+            const QMouseEvent *mouseEvent = static_cast<QMouseEvent *>( event );
+            move( mouseEvent->pos() );
+            return true;
+        }
+        case QEvent::KeyPress:
+        {
+            const QKeyEvent *keyEvent = static_cast<QKeyEvent *>( event );
+
+            const int delta = 5;
+            switch( keyEvent->key() )
+            {
+                case Qt::Key_Up:
+                {
+                    shiftCurveCursor( true );
+                    return true;
+                }
+                case Qt::Key_Down:
+                {
+                    shiftCurveCursor( false );
+                    return true;
+                }
+                case Qt::Key_Right:
+                case Qt::Key_Plus:
+                {
+                    if ( d_selectedCurve )
+                        shiftPointCursor( true );
+                    else
+                        shiftCurveCursor( true );
+                    return true;
+                }
+                case Qt::Key_Left:
+                case Qt::Key_Minus:
+                {
+                    if ( d_selectedCurve )
+                        shiftPointCursor( false );
+                    else
+                        shiftCurveCursor( true );
+                    return true;
+                }
+
+                // The following keys represent a direction, they are
+                // organized on the keyboard.
+
+                case Qt::Key_1:
+                {
+                    moveBy( -delta, delta );
+                    break;
+                }
+                case Qt::Key_2:
+                {
+                    moveBy( 0, delta );
+                    break;
+                }
+                case Qt::Key_3:
+                {
+                    moveBy( delta, delta );
+                    break;
+                }
+                case Qt::Key_4:
+                {
+                    moveBy( -delta, 0 );
+                    break;
+                }
+                case Qt::Key_6:
+                {
+                    moveBy( delta, 0 );
+                    break;
+                }
+                case Qt::Key_7:
+                {
+                    moveBy( -delta, -delta );
+                    break;
+                }
+                case Qt::Key_8:
+                {
+                    moveBy( 0, -delta );
+                    break;
+                }
+                case Qt::Key_9:
+                {
+                    moveBy( delta, -delta );
+                    break;
+                }
+                default:
+                    break;
+            }
+        }
+        default:
+            break;
+    }
+
+    return QObject::eventFilter( object, event );
+}
+
+// Select the point at a position. If there is no point
+// deselect the selected point
+
+void CanvasPicker::select( const QPoint &pos )
+{
+    QwtPlotCurve *curve = NULL;
+    double dist = 10e10;
+    int index = -1;
+
+    const QwtPlotItemList& itmList = plot()->itemList();
+    for ( QwtPlotItemIterator it = itmList.begin();
+        it != itmList.end(); ++it )
+    {
+        if ( ( *it )->rtti() == QwtPlotItem::Rtti_PlotCurve )
+        {
+            QwtPlotCurve *c = static_cast<QwtPlotCurve *>( *it );
+
+            double d;
+            int idx = c->closestPoint( pos, &d );
+            if ( d < dist )
+            {
+                curve = c;
+                index = idx;
+                dist = d;
+            }
+        }
+    }
+
+    showCursor( false );
+    d_selectedCurve = NULL;
+    d_selectedPoint = -1;
+
+    if ( curve && dist < 10 ) // 10 pixels tolerance
+    {
+        d_selectedCurve = curve;
+        d_selectedPoint = index;
+        showCursor( true );
+    }
+}
+
+// Move the selected point
+void CanvasPicker::moveBy( int dx, int dy )
+{
+    if ( dx == 0 && dy == 0 )
+        return;
+
+    if ( !d_selectedCurve )
+        return;
+
+    const QPointF sample =
+        d_selectedCurve->sample( d_selectedPoint );
+
+    const double x = plot()->transform(
+        d_selectedCurve->xAxis(), sample.x() );
+    const double y = plot()->transform(
+        d_selectedCurve->yAxis(), sample.y() );
+
+    move( QPoint( qRound( x + dx ), qRound( y + dy ) ) );
+}
+
+// Move the selected point
+void CanvasPicker::move( const QPoint &pos )
+{
+    if ( !d_selectedCurve )
+        return;
+
+    QVector<double> xData( d_selectedCurve->dataSize() );
+    QVector<double> yData( d_selectedCurve->dataSize() );
+
+    for ( int i = 0;
+        i < static_cast<int>( d_selectedCurve->dataSize() ); i++ )
+    {
+        if ( i == d_selectedPoint )
+        {
+            xData[i] = plot()->invTransform(
+                d_selectedCurve->xAxis(), pos.x() );
+            yData[i] = plot()->invTransform(
+                d_selectedCurve->yAxis(), pos.y() );
+        }
+        else
+        {
+            const QPointF sample = d_selectedCurve->sample( i );
+            xData[i] = sample.x();
+            yData[i] = sample.y();
+        }
+    }
+    d_selectedCurve->setSamples( xData, yData );
+
+    /*
+       Enable QwtPlotCanvas::ImmediatePaint, so that the canvas has been
+       updated before we paint the cursor on it.
+     */
+    QwtPlotCanvas *plotCanvas = 
+        qobject_cast<QwtPlotCanvas *>( plot()->canvas() );
+
+    plotCanvas->setPaintAttribute( QwtPlotCanvas::ImmediatePaint, true );
+    plot()->replot();
+    plotCanvas->setPaintAttribute( QwtPlotCanvas::ImmediatePaint, false );
+
+    showCursor( true );
+}
+
+// Hightlight the selected point
+void CanvasPicker::showCursor( bool showIt )
+{
+    if ( !d_selectedCurve )
+        return;
+
+    QwtSymbol *symbol = const_cast<QwtSymbol *>( d_selectedCurve->symbol() );
+
+    const QBrush brush = symbol->brush();
+    if ( showIt )
+        symbol->setBrush( symbol->brush().color().dark( 180 ) );
+
+    QwtPlotDirectPainter directPainter;
+    directPainter.drawSeries( d_selectedCurve, d_selectedPoint, d_selectedPoint );
+
+    if ( showIt )
+        symbol->setBrush( brush ); // reset brush
+}
+
+// Select the next/previous curve
+void CanvasPicker::shiftCurveCursor( bool up )
+{
+    QwtPlotItemIterator it;
+
+    const QwtPlotItemList &itemList = plot()->itemList();
+
+    QwtPlotItemList curveList;
+    for ( it = itemList.begin(); it != itemList.end(); ++it )
+    {
+        if ( ( *it )->rtti() == QwtPlotItem::Rtti_PlotCurve )
+            curveList += *it;
+    }
+    if ( curveList.isEmpty() )
+        return;
+
+    it = curveList.begin();
+
+    if ( d_selectedCurve )
+    {
+        for ( it = curveList.begin(); it != curveList.end(); ++it )
+        {
+            if ( d_selectedCurve == *it )
+                break;
+        }
+        if ( it == curveList.end() ) // not found
+            it = curveList.begin();
+
+        if ( up )
+        {
+            ++it;
+            if ( it == curveList.end() )
+                it = curveList.begin();
+        }
+        else
+        {
+            if ( it == curveList.begin() )
+                it = curveList.end();
+            --it;
+        }
+    }
+
+    showCursor( false );
+    d_selectedPoint = 0;
+    d_selectedCurve = static_cast<QwtPlotCurve *>( *it );
+    showCursor( true );
+}
+
+// Select the next/previous neighbour of the selected point
+void CanvasPicker::shiftPointCursor( bool up )
+{
+    if ( !d_selectedCurve )
+        return;
+
+    int index = d_selectedPoint + ( up ? 1 : -1 );
+    index = ( index + d_selectedCurve->dataSize() ) % d_selectedCurve->dataSize();
+
+    if ( index != d_selectedPoint )
+    {
+        showCursor( false );
+        d_selectedPoint = index;
+        showCursor( true );
+    }
+}

examples/event_filter/canvaspicker.h

@@ -0,0 +1,33 @@
+#include <qobject.h>
+
+class QPoint;
+class QCustomEvent;
+class QwtPlot;
+class QwtPlotCurve;
+
+class CanvasPicker: public QObject
+{
+    Q_OBJECT
+public:
+    CanvasPicker( QwtPlot *plot );
+    virtual bool eventFilter( QObject *, QEvent * );
+
+    virtual bool event( QEvent * );
+
+private:
+    void select( const QPoint & );
+    void move( const QPoint & );
+    void moveBy( int dx, int dy );
+
+    void release();
+
+    void showCursor( bool enable );
+    void shiftPointCursor( bool up );
+    void shiftCurveCursor( bool up );
+
+    QwtPlot *plot();
+    const QwtPlot *plot() const;
+
+    QwtPlotCurve *d_selectedCurve;
+    int d_selectedPoint;
+};

examples/event_filter/colorbar.cpp

@@ -0,0 +1,112 @@
+#include <qevent.h>
+#include <qpixmap.h>
+#include <qimage.h>
+#include <qpainter.h>
+#include "colorbar.h"
+
+ColorBar::ColorBar( Qt::Orientation o, QWidget *parent ):
+    QWidget( parent ),
+    d_orientation( o ),
+    d_light( Qt::white ),
+    d_dark( Qt::black )
+{
+#ifndef QT_NO_CURSOR
+    setCursor( Qt::PointingHandCursor );
+#endif
+}
+
+void ColorBar::setOrientation( Qt::Orientation o )
+{
+    d_orientation = o;
+    update();
+}
+
+void ColorBar::setLight( const QColor &light )
+{
+    d_light = light;
+    update();
+}
+
+void ColorBar::setDark( const QColor &dark )
+{
+    d_dark = dark;
+    update();
+}
+
+void ColorBar::setRange( const QColor &light, const QColor &dark )
+{
+    d_light = light;
+    d_dark = dark;
+    update();
+}
+
+void ColorBar::mousePressEvent( QMouseEvent *e )
+{
+    if( e->button() ==  Qt::LeftButton )
+    {
+        // emit the color of the position where the mouse click
+        // happened
+
+        const QPixmap pm = QPixmap::grabWidget( this );
+        const QRgb rgb = pm.toImage().pixel( e->x(), e->y() );
+
+        Q_EMIT selected( QColor( rgb ) );
+        e->accept();
+    }
+}
+
+void ColorBar::paintEvent( QPaintEvent * )
+{
+    QPainter painter( this );
+    drawColorBar( &painter, rect() );
+}
+
+void ColorBar::drawColorBar( QPainter *painter, const QRect &rect ) const
+{
+    int h1, s1, v1;
+    int h2, s2, v2;
+
+    d_light.getHsv( &h1, &s1, &v1 );
+    d_dark.getHsv( &h2, &s2, &v2 );
+
+    painter->save();
+    painter->setClipRect( rect );
+    painter->setClipping( true );
+
+    painter->fillRect( rect, d_dark );
+
+    const int sectionSize = 2;
+
+    int numIntervals;
+    if ( d_orientation == Qt::Horizontal )
+        numIntervals = rect.width() / sectionSize;
+    else
+        numIntervals = rect.height() / sectionSize;
+
+    for ( int i = 0; i < numIntervals; i++ )
+    {
+        QRect section;
+        if ( d_orientation == Qt::Horizontal )
+        {
+            section.setRect( rect.x() + i * sectionSize, rect.y(),
+                sectionSize, rect.height() );
+        }
+        else
+        {
+            section.setRect( rect.x(), rect.y() + i * sectionSize,
+                rect.width(), sectionSize );
+        }
+
+        const double ratio = i / static_cast<double>( numIntervals );
+
+        QColor c;
+        c.setHsv( h1 + qRound( ratio * ( h2 - h1 ) ),
+            s1 + qRound( ratio * ( s2 - s1 ) ),
+            v1 + qRound( ratio * ( v2 - v1 ) ) );
+
+        painter->fillRect( section, c );
+    }
+
+    painter->restore();
+}
+

examples/event_filter/colorbar.h

@@ -0,0 +1,33 @@
+#include <qwidget.h>
+
+class ColorBar: public QWidget
+{
+    Q_OBJECT
+
+public:
+    ColorBar( Qt::Orientation = Qt::Horizontal, QWidget * = NULL );
+
+    virtual void setOrientation( Qt::Orientation );
+    Qt::Orientation orientation() const { return d_orientation; }
+
+    void setRange( const QColor &light, const QColor &dark );
+    void setLight( const QColor &light );
+    void setDark( const QColor &dark );
+
+    QColor light() const { return d_light; }
+    QColor dark() const { return d_dark; }
+
+Q_SIGNALS:
+    void selected( const QColor & );
+
+protected:
+    virtual void mousePressEvent( QMouseEvent * );
+    virtual void paintEvent( QPaintEvent * );
+
+    void drawColorBar( QPainter *, const QRect & ) const;
+
+private:
+    Qt::Orientation d_orientation;
+    QColor d_light;
+    QColor d_dark;
+};

examples/event_filter/event_filter.cpp

@@ -0,0 +1,51 @@
+//-----------------------------------------------------------------
+//      A demo program showing how to use event filtering
+//-----------------------------------------------------------------
+
+#include <qapplication.h>
+#include <qmainwindow.h>
+#include <qwhatsthis.h>
+#include <qtoolbar.h>
+#include <qtoolbutton.h>
+#include "plot.h"
+#include "canvaspicker.h"
+#include "scalepicker.h"
+
+int main ( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    QMainWindow mainWindow;
+    QToolBar *toolBar = new QToolBar( &mainWindow );
+    QAction *action = QWhatsThis::createAction( toolBar );
+    toolBar->addAction( action );
+    mainWindow.addToolBar( toolBar );
+
+    Plot *plot = new Plot( &mainWindow );
+
+    // The canvas picker handles all mouse and key
+    // events on the plot canvas
+
+    ( void ) new CanvasPicker( plot );
+
+    // The scale picker translates mouse clicks
+    // int o clicked() signals
+
+    ScalePicker *scalePicker = new ScalePicker( plot );
+    a.connect( scalePicker, SIGNAL( clicked( int, double ) ),
+        plot, SLOT( insertCurve( int, double ) ) );
+
+    mainWindow.setCentralWidget( plot );
+
+    mainWindow.resize( 540, 400 );
+    mainWindow.show();
+
+    const char *text =
+        "An useless plot to demonstrate how to use event filtering.\n\n"
+        "You can click on the color bar, the scales or move the wheel.\n"
+        "All points can be moved using the mouse or the keyboard.";
+    plot->setWhatsThis( text );
+
+    int rv = a.exec();
+    return rv;
+}

examples/event_filter/event_filter.pro

@@ -0,0 +1,25 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET       = event_filter
+
+HEADERS = \
+    colorbar.h \
+    scalepicker.h \
+    canvaspicker.h \
+    plot.h 
+
+SOURCES = \
+    colorbar.cpp \
+    scalepicker.cpp \
+    canvaspicker.cpp \
+    plot.cpp \
+    event_filter.cpp 

examples/event_filter/plot.cpp

@@ -0,0 +1,176 @@
+#include "plot.h"
+#include "colorbar.h"
+#include <qevent.h>
+#include <qwt_plot_layout.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_grid.h>
+#include <qwt_plot_curve.h>
+#include <qwt_symbol.h>
+#include <qwt_scale_widget.h>
+#include <qwt_wheel.h>
+#include <stdlib.h>
+
+Plot::Plot( QWidget *parent ):
+    QwtPlot( parent )
+{
+    setTitle( "Interactive Plot" );
+
+    setCanvasColor( Qt::darkCyan );
+
+    QwtPlotGrid *grid = new QwtPlotGrid;
+    grid->setMajorPen( Qt::white, 0, Qt::DotLine );
+    grid->attach( this );
+
+    // axes
+
+    setAxisScale( QwtPlot::xBottom, 0.0, 100.0 );
+    setAxisScale( QwtPlot::yLeft, 0.0, 100.0 );
+
+    // Avoid jumping when label with 3 digits
+    // appear/disappear when scrolling vertically
+
+    QwtScaleDraw *sd = axisScaleDraw( QwtPlot::yLeft );
+    sd->setMinimumExtent( sd->extent( axisWidget( QwtPlot::yLeft )->font() ) );
+
+    plotLayout()->setAlignCanvasToScales( true );
+
+    insertCurve( Qt::Vertical, Qt::blue, 30.0 );
+    insertCurve( Qt::Vertical, Qt::magenta, 70.0 );
+    insertCurve( Qt::Horizontal, Qt::yellow, 30.0 );
+    insertCurve( Qt::Horizontal, Qt::white, 70.0 );
+
+    replot();
+
+    // ------------------------------------
+    // We add a color bar to the left axis
+    // ------------------------------------
+
+    QwtScaleWidget *scaleWidget = axisWidget( yLeft );
+    scaleWidget->setMargin( 10 ); // area for the color bar
+    d_colorBar = new ColorBar( Qt::Vertical, scaleWidget );
+    d_colorBar->setRange( Qt::red, Qt::darkBlue );
+    d_colorBar->setFocusPolicy( Qt::TabFocus );
+
+    connect( d_colorBar, SIGNAL( selected( const QColor & ) ),
+        SLOT( setCanvasColor( const QColor & ) ) );
+
+    // we need the resize events, to lay out the color bar
+    scaleWidget->installEventFilter( this );
+
+    // ------------------------------------
+    // We add a wheel to the canvas
+    // ------------------------------------
+
+    d_wheel = new QwtWheel( canvas() );
+    d_wheel->setOrientation( Qt::Vertical );
+    d_wheel->setRange( -100, 100 );
+    d_wheel->setValue( 0.0 );
+    d_wheel->setMass( 0.2 );
+    d_wheel->setTotalAngle( 4 * 360.0 );
+
+    connect( d_wheel, SIGNAL( valueChanged( double ) ),
+        SLOT( scrollLeftAxis( double ) ) );
+
+    // we need the resize events, to lay out the wheel
+    canvas()->installEventFilter( this );
+
+    d_colorBar->setWhatsThis(
+        "Selecting a color will change the background of the plot." );
+    scaleWidget->setWhatsThis(
+        "Selecting a value at the scale will insert a new curve." );
+    d_wheel->setWhatsThis(
+        "With the wheel you can move the visible area." );
+    axisWidget( xBottom )->setWhatsThis(
+        "Selecting a value at the scale will insert a new curve." );
+}
+
+void Plot::setCanvasColor( const QColor &c )
+{
+    setCanvasBackground( c );
+    replot();
+}
+
+void Plot::scrollLeftAxis( double value )
+{
+    setAxisScale( yLeft, value, value + 100.0 );
+    replot();
+}
+
+bool Plot::eventFilter( QObject *object, QEvent *e )
+{
+    if ( e->type() == QEvent::Resize )
+    {
+        const QSize size = static_cast<QResizeEvent *>( e )->size();
+        if ( object == axisWidget( yLeft ) )
+        {
+            const QwtScaleWidget *scaleWidget = axisWidget( yLeft );
+
+            const int margin = 2;
+
+            // adjust the color bar to the scale backbone
+            const int x = size.width() - scaleWidget->margin() + margin;
+            const int w = scaleWidget->margin() - 2 * margin;
+            const int y = scaleWidget->startBorderDist();
+            const int h = size.height() -
+                scaleWidget->startBorderDist() - scaleWidget->endBorderDist();
+
+            d_colorBar->setGeometry( x, y, w, h );
+        }
+        if ( object == canvas() )
+        {
+            const int w = 16;
+            const int h = 50;
+            const int margin = 2;
+
+            const QRect cr = canvas()->contentsRect();
+            d_wheel->setGeometry(
+                cr.right() - margin - w, cr.center().y() - h / 2, w, h );
+        }
+    }
+
+    return QwtPlot::eventFilter( object, e );
+}
+
+void Plot::insertCurve( int axis, double base )
+{
+    Qt::Orientation o;
+    if ( axis == yLeft || axis == yRight )
+        o = Qt::Horizontal;
+    else
+        o = Qt::Vertical;
+
+    QRgb rgb = static_cast<QRgb>( rand() );
+    insertCurve( o, QColor( rgb ), base );
+    replot();
+}
+
+void Plot::insertCurve( Qt::Orientation o,
+    const QColor &c, double base )
+{
+    QwtPlotCurve *curve = new QwtPlotCurve();
+
+    curve->setPen( c );
+    curve->setSymbol( new QwtSymbol( QwtSymbol::Ellipse,
+        Qt::gray, c, QSize( 8, 8 ) ) );
+
+    double x[10];
+    double y[sizeof( x ) / sizeof( x[0] )];
+
+    for ( uint i = 0; i < sizeof( x ) / sizeof( x[0] ); i++ )
+    {
+        double v = 5.0 + i * 10.0;
+        if ( o == Qt::Horizontal )
+        {
+            x[i] = v;
+            y[i] = base;
+        }
+        else
+        {
+            x[i] = base;
+            y[i] = v;
+        }
+    }
+
+    curve->setSamples( x, y, sizeof( x ) / sizeof( x[0] ) );
+    curve->attach( this );
+}

examples/event_filter/plot.h

@@ -0,0 +1,25 @@
+#include <qwt_plot.h>
+
+class ColorBar;
+class QwtWheel;
+
+class Plot: public QwtPlot
+{
+    Q_OBJECT
+public:
+    Plot( QWidget *parent = NULL );
+    virtual bool eventFilter( QObject *, QEvent * );
+
+public Q_SLOTS:
+    void setCanvasColor( const QColor & );
+    void insertCurve( int axis, double base );
+
+private Q_SLOTS:
+    void scrollLeftAxis( double );
+
+private:
+    void insertCurve( Qt::Orientation, const QColor &, double base );
+
+    ColorBar *d_colorBar;
+    QwtWheel *d_wheel;
+};

examples/event_filter/scalepicker.cpp

@@ -0,0 +1,119 @@
+#include "scalepicker.h"
+#include <qwt_plot.h>
+#include <qwt_scale_widget.h>
+#include <qevent.h>
+#include <qmath.h>
+
+ScalePicker::ScalePicker( QwtPlot *plot ):
+    QObject( plot )
+{
+    for ( uint i = 0; i < QwtPlot::axisCnt; i++ )
+    {
+        QwtScaleWidget *scaleWidget = plot->axisWidget( i );
+        if ( scaleWidget )
+            scaleWidget->installEventFilter( this );
+    }
+}
+
+bool ScalePicker::eventFilter( QObject *object, QEvent *event )
+{
+    if ( event->type() == QEvent::MouseButtonPress )
+    {
+        QwtScaleWidget *scaleWidget = qobject_cast<QwtScaleWidget *>( object );
+        if ( scaleWidget )
+        {
+            QMouseEvent *mouseEvent = static_cast<QMouseEvent *>( event );
+            mouseClicked( scaleWidget, mouseEvent->pos() );
+
+            return true;
+        }
+    }
+
+    return QObject::eventFilter( object, event );
+}
+
+void ScalePicker::mouseClicked( const QwtScaleWidget *scale, const QPoint &pos )
+{
+    QRect rect = scaleRect( scale );
+
+    int margin = 10; // 10 pixels tolerance
+    rect.setRect( rect.x() - margin, rect.y() - margin,
+        rect.width() + 2 * margin, rect.height() +  2 * margin );
+
+    if ( rect.contains( pos ) ) // No click on the title
+    {
+        // translate the position in a value on the scale
+
+        double value = 0.0;
+        int axis = -1;
+
+        const QwtScaleDraw *sd = scale->scaleDraw();
+        switch( scale->alignment() )
+        {
+            case QwtScaleDraw::LeftScale:
+            {
+                value = sd->scaleMap().invTransform( pos.y() );
+                axis = QwtPlot::yLeft;
+                break;
+            }
+            case QwtScaleDraw::RightScale:
+            {
+                value = sd->scaleMap().invTransform( pos.y() );
+                axis = QwtPlot::yRight;
+                break;
+            }
+            case QwtScaleDraw::BottomScale:
+            {
+                value = sd->scaleMap().invTransform( pos.x() );
+                axis = QwtPlot::xBottom;
+                break;
+            }
+            case QwtScaleDraw::TopScale:
+            {
+                value = sd->scaleMap().invTransform( pos.x() );
+                axis = QwtPlot::xTop;
+                break;
+            }
+        }
+        Q_EMIT clicked( axis, value );
+    }
+}
+
+// The rect of a scale without the title
+QRect ScalePicker::scaleRect( const QwtScaleWidget *scale ) const
+{
+    const int bld = scale->margin();
+    const int mjt = qCeil( scale->scaleDraw()->maxTickLength() );
+    const int sbd = scale->startBorderDist();
+    const int ebd = scale->endBorderDist();
+
+    QRect rect;
+    switch( scale->alignment() )
+    {
+        case QwtScaleDraw::LeftScale:
+        {
+            rect.setRect( scale->width() - bld - mjt, sbd,
+                mjt, scale->height() - sbd - ebd );
+            break;
+        }
+        case QwtScaleDraw::RightScale:
+        {
+            rect.setRect( bld, sbd,
+                mjt, scale->height() - sbd - ebd );
+            break;
+        }
+        case QwtScaleDraw::BottomScale:
+        {
+            rect.setRect( sbd, bld,
+                scale->width() - sbd - ebd, mjt );
+            break;
+        }
+        case QwtScaleDraw::TopScale:
+        {
+            rect.setRect( sbd, scale->height() - bld - mjt,
+                scale->width() - sbd - ebd, mjt );
+            break;
+        }
+    }
+    return rect;
+}

examples/event_filter/scalepicker.h

@@ -0,0 +1,20 @@
+#include <qobject.h>
+#include <qrect.h>
+
+class QwtPlot;
+class QwtScaleWidget;
+
+class ScalePicker: public QObject
+{
+    Q_OBJECT
+public:
+    ScalePicker( QwtPlot *plot );
+    virtual bool eventFilter( QObject *, QEvent * );
+
+Q_SIGNALS:
+    void clicked( int axis, double value );
+
+private:
+    void mouseClicked( const QwtScaleWidget *, const QPoint & );
+    QRect scaleRect( const QwtScaleWidget * ) const;
+};

examples/examples.pri

@@ -0,0 +1,69 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+###################################################################
+
+QWT_ROOT = $${PWD}/..
+include( $${QWT_ROOT}/qwtconfig.pri )
+include( $${QWT_ROOT}/qwtbuild.pri )
+include( $${QWT_ROOT}/qwtfunctions.pri )
+
+QWT_OUT_ROOT = $${OUT_PWD}/../..
+
+TEMPLATE     = app
+
+INCLUDEPATH += $${QWT_ROOT}/src
+DEPENDPATH  += $${QWT_ROOT}/src
+
+!debug_and_release {
+
+    DESTDIR      = $${QWT_OUT_ROOT}/examples/bin
+}
+else {
+    CONFIG(debug, debug|release) {
+
+        DESTDIR      = $${QWT_OUT_ROOT}/examples/bin_debug
+    }
+    else {
+
+        DESTDIR      = $${QWT_OUT_ROOT}/examples/bin
+    }
+}
+
+QMAKE_RPATHDIR *= $${QWT_OUT_ROOT}/lib
+qwtAddLibrary($${QWT_OUT_ROOT}/lib, qwt)
+
+greaterThan(QT_MAJOR_VERSION, 4) {
+
+    QT += printsupport
+    QT += concurrent
+}
+
+contains(QWT_CONFIG, QwtOpenGL ) {
+
+    QT += opengl
+}
+else {
+
+    DEFINES += QWT_NO_OPENGL
+}
+
+contains(QWT_CONFIG, QwtSvg) {
+
+    QT += svg
+}
+else {
+
+    DEFINES += QWT_NO_SVG
+}
+
+
+win32 {
+    contains(QWT_CONFIG, QwtDll) {
+        DEFINES    += QT_DLL QWT_DLL
+    }
+}

examples/examples.pro

@@ -0,0 +1,51 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../qwtconfig.pri )
+
+TEMPLATE = subdirs
+
+contains(QWT_CONFIG, QwtPlot) {
+    
+    SUBDIRS += \
+        animation \
+        barchart \
+        cpuplot \
+        curvdemo1   \
+        distrowatch \
+        friedberg \
+        itemeditor \
+        legends \
+        stockchart \
+        simpleplot \
+        sinusplot \
+        realtime \
+        refreshtest \
+        scatterplot \
+        spectrogram \
+        rasterview \
+        tvplot 
+
+    contains(QWT_CONFIG, QwtWidgets) {
+
+        SUBDIRS += \
+            bode \
+            event_filter \
+            oscilloscope  
+    }
+}
+
+contains(QWT_CONFIG, QwtWidgets) {
+
+    SUBDIRS += \
+        sysinfo \
+        radio \
+        dials \
+        controls
+}

examples/friedberg/friedberg.pro

@@ -0,0 +1,21 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET       = friedberg
+
+HEADERS = \
+    plot.h \
+    friedberg2007.h
+
+SOURCES = \
+    friedberg2007.cpp \
+    plot.cpp \
+    main.cpp

examples/friedberg/friedberg2007.cpp

@@ -0,0 +1,384 @@
+#include "friedberg2007.h"
+
+// Temperature 2007 from Friedberg somewhere in Germany
+// See: http://wetter61169.de
+
+Temperature friedberg2007[] =
+{
+    /* 01.01 */ Temperature( 2.6, 9.8, 7.07862 ),
+    /* 02.01 */ Temperature( 0.8, 5.8, 3.6993 ),
+    /* 03.01 */ Temperature( 2, 7, 5.02388 ),
+    /* 04.01 */ Temperature( 5.3, 7.8, 6.37778 ),
+    /* 05.01 */ Temperature( 5.6, 7.7, 6.83149 ),
+    /* 06.01 */ Temperature( 7.2, 8.9, 8.0816 ),
+    /* 07.01 */ Temperature( 4.2, 9.9, 7.54704 ),
+    /* 08.01 */ Temperature( 3.5, 8.9, 6.71951 ),
+    /* 09.01 */ Temperature( 8.2, 12.9, 10.8594 ),
+    /* 10.01 */ Temperature( 6.3, 11.9, 9.76424 ),
+    /* 11.01 */ Temperature( 3.9, 9.2, 6.18223 ),
+    /* 12.01 */ Temperature( 6.9, 9.7, 8.44236 ),
+    /* 13.01 */ Temperature( 9, 12.3, 10.6649 ),
+    /* 14.01 */ Temperature( 1.8, 10.8, 7.23438 ),
+    /* 15.01 */ Temperature( -2.8, 1.8, -0.518403 ),
+    /* 16.01 */ Temperature( -0.6, 4.5, 2.39479 ),
+    /* 17.01 */ Temperature( 4.3, 10.2, 7.23472 ),
+    /* 18.01 */ Temperature( 9.1, 13.6, 10.9316 ),
+    /* 19.01 */ Temperature( 6.9, 12.4, 9.4128 ),
+    /* 20.01 */ Temperature( 7.1, 13.3, 10.5083 ),
+    /* 21.01 */ Temperature( 3.5, 9.6, 6.10871 ),
+    /* 22.01 */ Temperature( -1.8, 6, 2.89028 ),
+    /* 23.01 */ Temperature( -5.4, 1.7, -2.46678 ),
+    /* 24.01 */ Temperature( -5.3, -1.3, -3.71483 ),
+    /* 25.01 */ Temperature( -7.5, 3.3, -3.36736 ),
+    /* 26.01 */ Temperature( -11.1, 0.3, -5.50662 ),
+    /* 27.01 */ Temperature( 0.2, 3.2, 1.95345 ),
+    /* 28.01 */ Temperature( 1.9, 5.2, 3.43633 ),
+    /* 29.01 */ Temperature( 4.4, 9.1, 6.24236 ),
+    /* 30.01 */ Temperature( 2.3, 11.5, 6.03114 ),
+    /* 31.01 */ Temperature( 4.6, 10.2, 6.04192 ),
+
+    /* 01.02 */ Temperature( 4.8, 13.8, 7.87674 ),
+    /* 02.02 */ Temperature( 5.7, 10, 7.28646 ),
+    /* 03.02 */ Temperature( 2.9, 8.2, 5.71771 ),
+    /* 04.02 */ Temperature( -1.5, 7.2, 4.71319 ),
+    /* 05.02 */ Temperature( -2.6, 4.4, 1.23542 ),
+    /* 06.02 */ Temperature( 0.3, 9.2, 2.59965 ),
+    /* 07.02 */ Temperature( -0.4, 2.4, 0.641667 ),
+    /* 08.02 */ Temperature( -1.7, 3.8, 0.811458 ),
+    /* 09.02 */ Temperature( 0.7, 7, 3.58328 ),
+    /* 10.02 */ Temperature( 1, 6, 3.51181 ),
+    /* 11.02 */ Temperature( 4.7, 9.6, 6.14913 ),
+    /* 12.02 */ Temperature( 5.3, 8.7, 6.80552 ),
+    /* 13.02 */ Temperature( 4.4, 10.3, 6.84552 ),
+    /* 14.02 */ Temperature( 2.6, 6.5, 4.58681 ),
+    /* 15.02 */ Temperature( -0.8, 13.4, 6.38542 ),
+    /* 16.02 */ Temperature( -3, 14.4, 4.11336 ),
+    /* 17.02 */ Temperature( 0.5, 13, 5.87457 ),
+    /* 18.02 */ Temperature( -2.2, 14.1, 4.36528 ),
+    /* 19.02 */ Temperature( 3.9, 5.6, 4.63737 ),
+    /* 20.02 */ Temperature( -0.4, 9.2, 4.37014 ),
+    /* 21.02 */ Temperature( -1.9, 5.5, 1.85675 ),
+    /* 22.02 */ Temperature( 1, 13.1, 5.41176 ),
+    /* 23.02 */ Temperature( 1.9, 13.9, 7.74251 ),
+    /* 24.02 */ Temperature( 3.8, 9.6, 7.19306 ),
+    /* 25.02 */ Temperature( 5.8, 10.8, 7.80312 ),
+    /* 26.02 */ Temperature( 5.2, 10.4, 6.79481 ),
+    /* 27.02 */ Temperature( 3.2, 7.4, 5.22986 ),
+    /* 28.02 */ Temperature( 6.4, 13.4, 9.13356 ),
+
+    /* 01.03 */ Temperature( 4.6, 11.4, 7.70554 ),
+    /* 02.03 */ Temperature( 3.4, 10.9, 5.98408 ),
+    /* 03.03 */ Temperature( 2.9, 10.5, 5.45675 ),
+    /* 04.03 */ Temperature( -0.7, 16.8, 7.29585 ),
+    /* 05.03 */ Temperature( 4.2, 13.4, 8.35862 ),
+    /* 06.03 */ Temperature( 3, 13, 7.76644 ),
+    /* 07.03 */ Temperature( 2, 13.3, 8.24618 ),
+    /* 08.03 */ Temperature( -0.8, 15, 6.11765 ),
+    /* 09.03 */ Temperature( -0.7, 11, 5.7568 ),
+    /* 10.03 */ Temperature( 1.2, 14.4, 6.61389 ),
+    /* 11.03 */ Temperature( -1.7, 18, 6.66146 ),
+    /* 12.03 */ Temperature( -0.6, 21.9, 8.9816 ),
+    /* 13.03 */ Temperature( -0.9, 19.6, 9.08299 ),
+    /* 14.03 */ Temperature( 5.3, 18.9, 10.5562 ),
+    /* 15.03 */ Temperature( 2, 20.5, 9.65156 ),
+    /* 16.03 */ Temperature( 0.2, 16.7, 7.8699 ),
+    /* 17.03 */ Temperature( 4.5, 10.6, 7.87535 ),
+    /* 18.03 */ Temperature( 2.7, 9.7, 6.71806 ),
+    /* 19.03 */ Temperature( 0.4, 10.9, 3.92404 ),
+    /* 20.03 */ Temperature( -2, 12.7, 4.01359 ),
+    /* 21.03 */ Temperature( 0.3, 6.8, 3.00382 ),
+    /* 22.03 */ Temperature( 0.9, 4.2, 2.2816 ),
+    /* 23.03 */ Temperature( 2, 5.7, 3.39233 ),
+    /* 24.03 */ Temperature( 3.9, 9.3, 6.41076 ),
+    /* 25.03 */ Temperature( 4.2, 19.1, 9.92182 ),
+    /* 26.03 */ Temperature( 2.3, 22, 12.5716 ),
+    /* 27.03 */ Temperature( 4.9, 20.6, 13.4568 ),
+    /* 28.03 */ Temperature( 0.3, 22.8, 10.755 ),
+    /* 29.03 */ Temperature( 1.8, 17.2, 9.43924 ),
+    /* 30.03 */ Temperature( 1.9, 19.8, 10.25 ),
+    /* 31.03 */ Temperature( 6.7, 17, 11.1324 ),
+
+    /* 01.04 */ Temperature( 5.7, 22, 12.8457 ),
+    /* 02.04 */ Temperature( 6.4, 22.1, 13.3847 ),
+    /* 03.04 */ Temperature( 5.8, 17.5, 10.5614 ),
+    /* 04.04 */ Temperature( 2.8, 16.2, 8.06574 ),
+    /* 05.04 */ Temperature( -0.6, 20.8, 9.18062 ),
+    /* 06.04 */ Temperature( 2.1, 24, 13.0069 ),
+    /* 07.04 */ Temperature( 5.3, 16.2, 10.2771 ),
+    /* 08.04 */ Temperature( 0.1, 20.7, 9.79861 ),
+    /* 09.04 */ Temperature( 0.3, 18.9, 10.0087 ),
+    /* 10.04 */ Temperature( 4, 16.4, 11.4208 ),
+    /* 11.04 */ Temperature( 2.3, 23.4, 13.083 ),
+    /* 12.04 */ Temperature( 7, 29.4, 16.5826 ),
+    /* 13.04 */ Temperature( 10.6, 31.5, 19.2249 ),
+    /* 14.04 */ Temperature( 11.8, 34, 21.441 ),
+    /* 15.04 */ Temperature( 11.6, 33.8, 21.0201 ),
+    /* 16.04 */ Temperature( 8.7, 31.1, 18.7885 ),
+    /* 17.04 */ Temperature( 5.5, 27.2, 16.1432 ),
+    /* 18.04 */ Temperature( 6.1, 17.2, 10.6688 ),
+    /* 19.04 */ Temperature( -0.6, 21.3, 10.4806 ),
+    /* 20.04 */ Temperature( 5.9, 21.6, 12.6257 ),
+    /* 21.04 */ Temperature( 2.1, 21.6, 11.0858 ),
+    /* 22.04 */ Temperature( 3.9, 25.9, 14.2108 ),
+    /* 23.04 */ Temperature( 3.1, 27.8, 15.7111 ),
+    /* 24.04 */ Temperature( 13.7, 29, 19.6397 ),
+    /* 25.04 */ Temperature( 9.8, 31.6, 19.601 ),
+    /* 26.04 */ Temperature( 8.2, 32.4, 20.0389 ),
+    /* 27.04 */ Temperature( 11.8, 32.1, 21.0726 ),
+    /* 28.04 */ Temperature( 12.6, 33.3, 21.6993 ),
+    /* 29.04 */ Temperature( 10.5, 27.4, 19.1206 ),
+    /* 30.04 */ Temperature( 5.3, 26.4, 15.0972 ),
+
+    /* 01.05 */ Temperature( 6.9, 25.3, 15.2802 ),
+    /* 02.05 */ Temperature( 4.3, 26.2, 14.8401 ),
+    /* 03.05 */ Temperature( 7.1, 28.5, 17.2145 ),
+    /* 04.05 */ Temperature( 11, 28.5, 18.537 ),
+    /* 05.05 */ Temperature( 12, 28, 18.1672 ),
+    /* 06.05 */ Temperature( 10.4, 29, 18.3844 ),
+    /* 07.05 */ Temperature( 13, 18.1, 15.0028 ),
+    /* 08.05 */ Temperature( 10.7, 18.3, 13.2014 ),
+    /* 09.05 */ Temperature( 10.8, 14.4, 12.5208 ),
+    /* 10.05 */ Temperature( 11.9, 23.5, 16.9632 ),
+    /* 11.05 */ Temperature( 9.8, 16.9, 15.0795 ),
+    /* 12.05 */ Temperature( 9.2, 19.6, 13.8521 ),
+    /* 13.05 */ Temperature( 8.9, 26.3, 16.2028 ),
+    /* 14.05 */ Temperature( 11.1, 17.5, 13.2934 ),
+    /* 15.05 */ Temperature( 6.5, 17, 11.7743 ),
+    /* 16.05 */ Temperature( 4.9, 13.6, 9.75625 ),
+    /* 17.05 */ Temperature( 6.8, 16.6, 9.96701 ),
+    /* 18.05 */ Temperature( 2.4, 21.2, 11.4311 ),
+    /* 19.05 */ Temperature( 8.2, 24.4, 15.4188 ),
+    /* 20.05 */ Temperature( 14.1, 31.7, 21.3303 ),
+    /* 21.05 */ Temperature( 11, 30.9, 21.5359 ),
+    /* 22.05 */ Temperature( 13.8, 31, 21.5177 ),
+    /* 23.05 */ Temperature( 16, 27.8, 21.0271 ),
+    /* 24.05 */ Temperature( 15, 34, 23.4142 ),
+    /* 25.05 */ Temperature( 14.3, 31.8, 22.8903 ),
+    /* 26.05 */ Temperature( 13.6, 33.1, 22.6156 ),
+    /* 27.05 */ Temperature( 11.2, 23.4, 16.6192 ),
+    /* 28.05 */ Temperature( 9.6, 13.1, 11.3222 ),
+    /* 29.05 */ Temperature( 8.3, 11.2, 10.3529 ),
+    /* 30.05 */ Temperature( 4.2, 20.8, 12.6218 ),
+    /* 31.05 */ Temperature( 9.2, 23.6, 15.1073 ),
+
+    /* 01.06 */ Temperature( 10.8, 24.4, 16.3205 ),
+    /* 02.06 */ Temperature( 13, 26.5, 18.9649 ),
+    /* 03.06 */ Temperature( 14, 25.1, 18.5398 ),
+    /* 04.06 */ Temperature( 13, 28, 20.2139 ),
+    /* 05.06 */ Temperature( 14, 28.8, 20.438 ),
+    /* 06.06 */ Temperature( 14, 30.4, 21.7821 ),
+    /* 07.06 */ Temperature( 17, 34.8, 25.3087 ),
+    /* 08.06 */ Temperature( 17.9, 35.7, 25.7872 ),
+    /* 09.06 */ Temperature( 17.8, 31.6, 22.0788 ),
+    /* 10.06 */ Temperature( 15.5, 33.4, 22.4458 ),
+    /* 11.06 */ Temperature( 16.6, 28.3, 19.8797 ),
+    /* 12.06 */ Temperature( 14, 27.3, 20.2566 ),
+    /* 13.06 */ Temperature( 13.2, 28.2, 19.4233 ),
+    /* 14.06 */ Temperature( 12.7, 30, 20.1427 ),
+    /* 15.06 */ Temperature( 15.2, 22.6, 18.5917 ),
+    /* 16.06 */ Temperature( 13.2, 24, 17.7014 ),
+    /* 17.06 */ Temperature( 11.7, 27.9, 19.8229 ),
+    /* 18.06 */ Temperature( 15.9, 27.2, 20.3358 ),
+    /* 19.06 */ Temperature( 12.6, 33.7, 22.2427 ),
+    /* 20.06 */ Temperature( 15.7, 30.8, 23.7507 ),
+    /* 21.06 */ Temperature( 14.8, 22.6, 18.2538 ),
+    /* 22.06 */ Temperature( 12.4, 21.3, 15.9969 ),
+    /* 23.06 */ Temperature( 12.6, 21.6, 15.8149 ),
+    /* 24.06 */ Temperature( 13, 26, 18.4176 ),
+    /* 25.06 */ Temperature( 12.9, 24.4, 17.1299 ),
+    /* 26.06 */ Temperature( 10.8, 18.8, 13.2913 ),
+    /* 27.06 */ Temperature( 9.9, 18.8, 13.5465 ),
+    /* 28.06 */ Temperature( 12, 19.8, 14.8434 ),
+    /* 29.06 */ Temperature( 12, 19, 15.155 ),
+    /* 30.06 */ Temperature( 12.4, 22.4, 17.1354 ),
+
+    /* 01.07 */ Temperature( 12.1, 24.9, 19.1639 ),
+    /* 02.07 */ Temperature( 15.7, 24.3, 18.4554 ),
+    /* 03.07 */ Temperature( 12.7, 17.2, 14.6564 ),
+    /* 04.07 */ Temperature( 11.2, 19, 13.9529 ),
+    /* 05.07 */ Temperature( 11.5, 19, 14.6422 ),
+    /* 06.07 */ Temperature( 12.4, 22, 16.6146 ),
+    /* 07.07 */ Temperature( 11.6, 24, 17.666 ),
+    /* 08.07 */ Temperature( 9, 28, 19.1351 ),
+    /* 09.07 */ Temperature( 11.3, 21.5, 16.5271 ),
+    /* 10.07 */ Temperature( 11.3, 20.2, 14.2326 ),
+    /* 11.07 */ Temperature( 10.2, 19.2, 14.0649 ),
+    /* 12.07 */ Temperature( 13.2, 23.1, 16.6346 ),
+    /* 13.07 */ Temperature( 15, 27, 19.6844 ),
+    /* 14.07 */ Temperature( 13.4, 32.4, 23.845 ),
+    /* 15.07 */ Temperature( 15, 38.2, 26.8559 ),
+    /* 16.07 */ Temperature( 16.1, 36.5, 26.4483 ),
+    /* 17.07 */ Temperature( 19.7, 30.5, 24.189 ),
+    /* 18.07 */ Temperature( 14.2, 29.3, 22.1363 ),
+    /* 19.07 */ Temperature( 16.4, 25.9, 19.0819 ),
+    /* 20.07 */ Temperature( 16.2, 30.8, 22.151 ),
+    /* 21.07 */ Temperature( 14, 24.3, 18.6573 ),
+    /* 22.07 */ Temperature( 13.2, 24.5, 18.3301 ),
+    /* 23.07 */ Temperature( 10.6, 23.4, 16.6903 ),
+    /* 24.07 */ Temperature( 13.2, 20.8, 16.2743 ),
+    /* 25.07 */ Temperature( 12.2, 25.8, 18.8267 ),
+    /* 26.07 */ Temperature( 11.9, 28.9, 20.5522 ),
+    /* 27.07 */ Temperature( 17.6, 25.8, 21.5691 ),
+    /* 28.07 */ Temperature( 16.6, 24.6, 19.2295 ),
+    /* 29.07 */ Temperature( 13, 19, 15.9021 ),
+    /* 30.07 */ Temperature( 9.6, 19.7, 13.875 ),
+    /* 31.07 */ Temperature( 8, 22, 14.5284 ),
+
+    /* 01.08 */ Temperature( 7.6, 27.5, 17.5684 ),
+    /* 02.08 */ Temperature( 9.2, 22.2, 16.1035 ),
+    /* 03.08 */ Temperature( 12.7, 25.3, 18.2958 ),
+    /* 04.08 */ Temperature( 8.6, 31.3, 19.7941 ),
+    /* 05.08 */ Temperature( 10.3, 32.7, 21.492 ),
+    /* 06.08 */ Temperature( 10, 33.4, 22.4431 ),
+    /* 07.08 */ Temperature( 16.8, 22.6, 19.5583 ),
+    /* 08.08 */ Temperature( 13.5, 16.7, 15.0264 ),
+    /* 09.08 */ Temperature( 13.2, 18.8, 15.6003 ),
+    /* 10.08 */ Temperature( 14.6, 27.9, 18.8292 ),
+    /* 11.08 */ Temperature( 16.3, 26.4, 20.3837 ),
+    /* 12.08 */ Temperature( 12.1, 28.7, 19.9892 ),
+    /* 13.08 */ Temperature( 15, 27.4, 19.7542 ),
+    /* 14.08 */ Temperature( 11.3, 28.3, 20.5656 ),
+    /* 15.08 */ Temperature( 18.6, 28.4, 23.1215 ),
+    /* 16.08 */ Temperature( 16, 23.6, 19.491 ),
+    /* 17.08 */ Temperature( 12.6, 22, 17.0437 ),
+    /* 18.08 */ Temperature( 8.5, 25.7, 16.5589 ),
+    /* 19.08 */ Temperature( 13.4, 25.8, 18.0543 ),
+    /* 20.08 */ Temperature( 10.9, 21.5, 16.1306 ),
+    /* 21.08 */ Temperature( 10.6, 19.2, 14.6177 ),
+    /* 22.08 */ Temperature( 14, 24.6, 17.3841 ),
+    /* 23.08 */ Temperature( 13.8, 30.4, 20.6125 ),
+    /* 24.08 */ Temperature( 12.3, 30.3, 20.7622 ),
+    /* 25.08 */ Temperature( 12.8, 30.2, 21.6736 ),
+    /* 26.08 */ Temperature( 15, 29.3, 21.266 ),
+    /* 27.08 */ Temperature( 12.9, 25.9, 18.791 ),
+    /* 28.08 */ Temperature( 9.3, 24.6, 16.2833 ),
+    /* 29.08 */ Temperature( 10.8, 25, 16.8459 ),
+    /* 30.08 */ Temperature( 8.2, 24.4, 15.9267 ),
+    /* 31.08 */ Temperature( 14.1, 20.5, 16.6128 ),
+
+    /* 01.09 */ Temperature( 13.4, 21.9, 16.2205 ),
+    /* 02.09 */ Temperature( 12, 20.7, 16.0882 ),
+    /* 03.09 */ Temperature( 10.8, 21.3, 14.7913 ),
+    /* 04.09 */ Temperature( 7.8, 18.2, 12.2747 ),
+    /* 05.09 */ Temperature( 8.1, 22.2, 12.9406 ),
+    /* 06.09 */ Temperature( 10, 23.8, 13.8785 ),
+    /* 07.09 */ Temperature( 10.7, 21.2, 15.4823 ),
+    /* 08.09 */ Temperature( 12.4, 21, 15.8194 ),
+    /* 09.09 */ Temperature( 12.7, 16.9, 14.7212 ),
+    /* 10.09 */ Temperature( 10.3, 17.7, 12.9271 ),
+    /* 11.09 */ Temperature( 10.6, 20.8, 14.4788 ),
+    /* 12.09 */ Temperature( 10.8, 21.9, 15.0184 ),
+    /* 13.09 */ Temperature( 6.9, 24.6, 14.5222 ),
+    /* 14.09 */ Temperature( 8.1, 24, 15.6583 ),
+    /* 15.09 */ Temperature( 8.8, 22.8, 15.941 ),
+    /* 16.09 */ Temperature( 3.1, 24.5, 14.1486 ),
+    /* 17.09 */ Temperature( 12.4, 21.2, 16.0497 ),
+    /* 18.09 */ Temperature( 7.8, 16.1, 12.024 ),
+    /* 19.09 */ Temperature( 5.3, 18.1, 10.3003 ),
+    /* 20.09 */ Temperature( 6.4, 20.3, 12.3177 ),
+    /* 21.09 */ Temperature( 6, 23.8, 13.6247 ),
+    /* 22.09 */ Temperature( 5.7, 27, 14.6847 ),
+    /* 23.09 */ Temperature( 7.8, 28, 16.6238 ),
+    /* 24.09 */ Temperature( 9.6, 24.9, 16.7191 ),
+    /* 25.09 */ Temperature( 8.4, 17.6, 12.636 ),
+    /* 26.09 */ Temperature( 4.3, 18.9, 10.0809 ),
+    /* 27.09 */ Temperature( 9.4, 11.2, 10.3344 ),
+    /* 28.09 */ Temperature( 7.7, 12.6, 10.5337 ),
+    /* 29.09 */ Temperature( 9.8, 15.3, 11.9306 ),
+    /* 30.09 */ Temperature( 9.6, 21.1, 13.6635 ),
+
+    /* 01.10 */ Temperature( 8.9, 24.5, 14.8163 ),
+    /* 02.10 */ Temperature( 13.5, 20.2, 16.1628 ),
+    /* 03.10 */ Temperature( 12.5, 18, 15.4691 ),
+    /* 04.10 */ Temperature( 13.8, 25, 17.2073 ),
+    /* 05.10 */ Temperature( 9.1, 23.2, 14.6181 ),
+    /* 06.10 */ Temperature( 6.4, 23.4, 12.8625 ),
+    /* 07.10 */ Temperature( 4.6, 22.1, 11.0052 ),
+    /* 08.10 */ Temperature( 2, 22.2, 10.1677 ),
+    /* 09.10 */ Temperature( 7.8, 21.6, 12.2139 ),
+    /* 10.10 */ Temperature( 7.1, 22.7, 13.0115 ),
+    /* 11.10 */ Temperature( 6.1, 21.2, 11.4333 ),
+    /* 12.10 */ Temperature( 4.3, 15.2, 10.6104 ),
+    /* 13.10 */ Temperature( 5.8, 23, 12.8875 ),
+    /* 14.10 */ Temperature( 1, 23, 9.72986 ),
+    /* 15.10 */ Temperature( 1, 19.3, 9.33021 ),
+    /* 16.10 */ Temperature( 8.5, 20.4, 13.2639 ),
+    /* 17.10 */ Temperature( 6.8, 17.3, 11.8174 ),
+    /* 18.10 */ Temperature( 5.2, 15.6, 9.06076 ),
+    /* 19.10 */ Temperature( 2.7, 13.5, 7.1309 ),
+    /* 20.10 */ Temperature( -0.2, 15.8, 6.01667 ),
+    /* 21.10 */ Temperature( 2.6, 6.1, 4.9441 ),
+    /* 22.10 */ Temperature( -0.8, 13.2, 4.50694 ),
+    /* 23.10 */ Temperature( -0.4, 13.3, 4.71007 ),
+    /* 24.10 */ Temperature( 2.9, 8.1, 5.96979 ),
+    /* 25.10 */ Temperature( 6.3, 10.5, 8.01206 ),
+    /* 26.10 */ Temperature( 7, 10.8, 8.14965 ),
+    /* 27.10 */ Temperature( 6.6, 9.7, 7.7809 ),
+    /* 28.10 */ Temperature( 1.7, 10.8, 6.95728 ),
+    /* 29.10 */ Temperature( 2.2, 9.9, 6.62917 ),
+    /* 30.10 */ Temperature( 5.8, 15, 8.76181 ),
+    /* 31.10 */ Temperature( 0.7, 15, 6.01528 ),
+
+    /* 01.11 */ Temperature( -0.2, 9.7, 3.75842 ),
+    /* 02.11 */ Temperature( 6.4, 9.6, 8.00138 ),
+    /* 03.11 */ Temperature( 8.7, 13.1, 10.5676 ),
+    /* 04.11 */ Temperature( 8, 11.8, 9.54306 ),
+    /* 05.11 */ Temperature( 5.8, 15.9, 8.52345 ),
+    /* 06.11 */ Temperature( 5.5, 10.8, 7.16493 ),
+    /* 07.11 */ Temperature( 5.5, 8.9, 7.30172 ),
+    /* 08.11 */ Temperature( 7, 11.7, 8.96701 ),
+    /* 09.11 */ Temperature( 2.5, 8.4, 4.86528 ),
+    /* 10.11 */ Temperature( 3.7, 9, 5.20828 ),
+    /* 11.11 */ Temperature( 2.8, 10.6, 6.80756 ),
+    /* 12.11 */ Temperature( 2.7, 9.5, 5.07647 ),
+    /* 13.11 */ Temperature( 0.1, 5.4, 3.3945 ),
+    /* 14.11 */ Temperature( -0.7, 7.9, 2.02234 ),
+    /* 15.11 */ Temperature( -1.8, 6.5, 1.07778 ),
+    /* 16.11 */ Temperature( -4.4, 5.1, -0.693772 ),
+    /* 17.11 */ Temperature( -0.3, 3.4, 1.33229 ),
+    /* 18.11 */ Temperature( -0.4, 4.3, 2.4622 ),
+    /* 19.11 */ Temperature( 1.8, 3.6, 2.78282 ),
+    /* 20.11 */ Temperature( 1.3, 5.6, 2.95979 ),
+    /* 21.11 */ Temperature( 1.6, 5.7, 3.62284 ),
+    /* 22.11 */ Temperature( 3.1, 7.3, 5.60277 ),
+    /* 23.11 */ Temperature( 4.2, 7.7, 6.28166 ),
+    /* 24.11 */ Temperature( -0.5, 11.5, 3.25931 ),
+    /* 25.11 */ Temperature( -1, 8.8, 2.86505 ),
+    /* 26.11 */ Temperature( 1.2, 6.8, 3.09414 ),
+    /* 27.11 */ Temperature( -0.8, 7.5, 3.17805 ),
+    /* 28.11 */ Temperature( -2.8, 3.1, -0.920139 ),
+    /* 29.11 */ Temperature( -2.6, 1.7, -0.491696 ),
+    /* 30.11 */ Temperature( 1.3, 6.5, 3.85 ),
+
+    /* 01.12 */ Temperature( 4.1, 8.7, 5.88924 ),
+    /* 02.12 */ Temperature( 4.8, 9, 6.81667 ),
+    /* 03.12 */ Temperature( 3.5, 8.5, 6.23633 ),
+    /* 04.12 */ Temperature( 2.7, 6.6, 4.63045 ),
+    /* 05.12 */ Temperature( 4.3, 8.6, 6.85993 ),
+    /* 06.12 */ Temperature( 5.5, 9.3, 7.79201 ),
+    /* 07.12 */ Temperature( 3.1, 13.4, 8.79444 ),
+    /* 08.12 */ Temperature( 2.6, 6.3, 4.67093 ),
+    /* 09.12 */ Temperature( 3, 10.4, 5.75724 ),
+    /* 10.12 */ Temperature( 4.1, 6.8, 5.31834 ),
+    /* 11.12 */ Temperature( 4.1, 7.4, 5.28993 ),
+    /* 12.12 */ Temperature( 3.9, 6.4, 4.64479 ),
+    /* 13.12 */ Temperature( 1.7, 9.1, 4.15363 ),
+    /* 14.12 */ Temperature( 0.4, 1.8, 0.934602 ),
+    /* 15.12 */ Temperature( -4.5, 2.1, -1.17292 ),
+    /* 16.12 */ Temperature( -5, 4.8, -2.17431 ),
+    /* 17.12 */ Temperature( -5.6, 6.1, -1.35448 ),
+    /* 18.12 */ Temperature( -4.9, 6.4, -1.25502 ),
+    /* 19.12 */ Temperature( -4.4, 6.6, -1.02396 ),
+    /* 20.12 */ Temperature( -7.3, 5.2, -2.63854 ),
+    /* 21.12 */ Temperature( -8.5, 5.7, -3.58333 ),
+    /* 22.12 */ Temperature( -7.9, -5.3, -6.13438 ),
+    /* 23.12 */ Temperature( -6.1, -4.4, -5.23472 ),
+    /* 24.12 */ Temperature( -4.6, -3.3, -3.84291 ),
+    /* 25.12 */ Temperature( -4.9, -2.8, -3.9066 ),
+    /* 26.12 */ Temperature( -4.7, -1.9, -3.10379 ),
+    /* 27.12 */ Temperature( -1.9, -0.2, -0.679791 ),
+    /* 28.12 */ Temperature( -1.8, 0.5, -0.521875 ),
+    /* 29.12 */ Temperature( -2.2, 2.3, -0.430796 ),
+    /* 30.12 */ Temperature( 0.9, 5.2, 2.83437 ),
+    /* 31.12 */ Temperature( -1, 8.3, 2.27093 )
+};

examples/friedberg/friedberg2007.h

@@ -0,0 +1,28 @@
+#ifndef _FRIEDBERG_2007_H_
+#define _FRIEDBERG_2007_H_
+
+class Temperature
+{
+public:
+    Temperature():
+        minValue( 0.0 ),
+        maxValue( 0.0 ),
+        averageValue( 0.0 )
+    {
+    }
+
+    Temperature( double min, double max, double average ):
+        minValue( min ),
+        maxValue( max ),
+        averageValue( average )
+    {
+    }
+
+    double minValue;
+    double maxValue;
+    double averageValue;
+};
+
+extern Temperature friedberg2007[];
+
+#endif

examples/friedberg/main.cpp

@@ -0,0 +1,55 @@
+#include <qapplication.h>
+#include <qmainwindow.h>
+#include <qcombobox.h>
+#include <qtoolbar.h>
+#include <qtoolbutton.h>
+#include "plot.h"
+
+class MainWindow: public QMainWindow
+{
+public:
+    MainWindow( QWidget * = NULL );
+
+private:
+    Plot *d_plot;
+};
+
+MainWindow::MainWindow( QWidget *parent ):
+    QMainWindow( parent )
+{
+    d_plot = new Plot( this );
+    setCentralWidget( d_plot );
+
+    QToolBar *toolBar = new QToolBar( this );
+
+    QComboBox *typeBox = new QComboBox( toolBar );
+    typeBox->addItem( "Bars" );
+    typeBox->addItem( "Tube" );
+    typeBox->setCurrentIndex( 1 );
+    typeBox->setSizePolicy( QSizePolicy::Fixed, QSizePolicy::Fixed );
+
+    QToolButton *btnExport = new QToolButton( toolBar );
+    btnExport->setText( "Export" );
+    btnExport->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+    connect( btnExport, SIGNAL( clicked() ), d_plot, SLOT( exportPlot() ) );
+
+    toolBar->addWidget( typeBox );
+    toolBar->addWidget( btnExport );
+    addToolBar( toolBar );
+
+    d_plot->setMode( typeBox->currentIndex() );
+    connect( typeBox, SIGNAL( currentIndexChanged( int ) ),
+             d_plot, SLOT( setMode( int ) ) );
+}
+
+int main( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    MainWindow w;
+    w.setObjectName( "MainWindow" );
+    w.resize( 600, 400 );
+    w.show();
+
+    return a.exec();
+}

examples/friedberg/plot.cpp

@@ -0,0 +1,209 @@
+#include "plot.h"
+#include "friedberg2007.h"
+#include <qwt_plot_zoomer.h>
+#include <qwt_plot_panner.h>
+#include <qwt_plot_marker.h>
+#include <qwt_plot_grid.h>
+#include <qwt_plot_curve.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_intervalcurve.h>
+#include <qwt_legend.h>
+#include <qwt_interval_symbol.h>
+#include <qwt_symbol.h>
+#include <qwt_series_data.h>
+#include <qwt_text.h>
+#include <qwt_scale_draw.h>
+#include <qwt_plot_renderer.h>
+#include <qdatetime.h>
+
+class Grid: public QwtPlotGrid
+{
+public:
+    Grid()
+    {
+        enableXMin( true );
+        setMajorPen( Qt::white, 0, Qt::DotLine );
+        setMinorPen( Qt::gray, 0, Qt::DotLine );
+    }
+
+    virtual void updateScaleDiv( const QwtScaleDiv &xScaleDiv,
+        const QwtScaleDiv &yScaleDiv )
+    {
+        QwtScaleDiv scaleDiv( xScaleDiv.lowerBound(), 
+            xScaleDiv.upperBound() );
+
+        scaleDiv.setTicks( QwtScaleDiv::MinorTick,
+            xScaleDiv.ticks( QwtScaleDiv::MinorTick ) );
+        scaleDiv.setTicks( QwtScaleDiv::MajorTick,
+            xScaleDiv.ticks( QwtScaleDiv::MediumTick ) );
+
+        QwtPlotGrid::updateScaleDiv( scaleDiv, yScaleDiv );
+    }
+};
+
+class YearScaleDraw: public QwtScaleDraw
+{
+public:
+    YearScaleDraw()
+    {
+        setTickLength( QwtScaleDiv::MajorTick, 0 );
+        setTickLength( QwtScaleDiv::MinorTick, 0 );
+        setTickLength( QwtScaleDiv::MediumTick, 6 );
+
+        setLabelRotation( -60.0 );
+        setLabelAlignment( Qt::AlignLeft | Qt::AlignVCenter );
+
+        setSpacing( 15 );
+    }
+
+    virtual QwtText label( double value ) const
+    {
+        return QDate::longMonthName( int( value / 30 ) + 1 );
+    }
+};
+
+Plot::Plot( QWidget *parent ):
+    QwtPlot( parent )
+{
+    setObjectName( "FriedbergPlot" );
+    setTitle( "Temperature of Friedberg/Germany" );
+
+    setAxisTitle( QwtPlot::xBottom, "2007" );
+    setAxisScaleDiv( QwtPlot::xBottom, yearScaleDiv() );
+    setAxisScaleDraw( QwtPlot::xBottom, new YearScaleDraw() );
+
+    setAxisTitle( QwtPlot::yLeft,
+        QString( "Temperature [%1C]" ).arg( QChar( 0x00B0 ) ) );
+
+    QwtPlotCanvas *canvas = new QwtPlotCanvas();
+    canvas->setPalette( Qt::darkGray );
+    canvas->setBorderRadius( 10 );
+
+    setCanvas( canvas );
+
+    // grid
+    QwtPlotGrid *grid = new Grid;
+    grid->attach( this );
+
+    insertLegend( new QwtLegend(), QwtPlot::RightLegend );
+
+    const int numDays = 365;
+    QVector<QPointF> averageData( numDays );
+    QVector<QwtIntervalSample> rangeData( numDays );
+
+    for ( int i = 0; i < numDays; i++ )
+    {
+        const Temperature &t = friedberg2007[i];
+        averageData[i] = QPointF( double( i ), t.averageValue );
+        rangeData[i] = QwtIntervalSample( double( i ),
+            QwtInterval( t.minValue, t.maxValue ) );
+    }
+
+    insertCurve( "Average", averageData, Qt::black );
+    insertErrorBars( "Range", rangeData, Qt::blue );
+
+    // LeftButton for the zooming
+    // MidButton for the panning
+    // RightButton: zoom out by 1
+    // Ctrl+RighButton: zoom out to full size
+
+    QwtPlotZoomer* zoomer = new QwtPlotZoomer( canvas );
+    zoomer->setRubberBandPen( QColor( Qt::black ) );
+    zoomer->setTrackerPen( QColor( Qt::black ) );
+    zoomer->setMousePattern( QwtEventPattern::MouseSelect2,
+        Qt::RightButton, Qt::ControlModifier );
+    zoomer->setMousePattern( QwtEventPattern::MouseSelect3,
+        Qt::RightButton );
+
+    QwtPlotPanner *panner = new QwtPlotPanner( canvas );
+    panner->setMouseButton( Qt::MidButton );
+}
+
+QwtScaleDiv Plot::yearScaleDiv() const
+{
+    const int days[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+
+    QList<double> mediumTicks;
+    mediumTicks += 0.0;
+    for ( uint i = 0; i < sizeof( days ) / sizeof( days[0] ); i++ )
+        mediumTicks += mediumTicks.last() + days[i];
+
+    QList<double> minorTicks;
+    for ( int i = 1; i <= 365; i += 7 )
+        minorTicks += i;
+
+    QList<double> majorTicks;
+    for ( int i = 0; i < 12; i++ )
+        majorTicks += i * 30 + 15;
+
+    QwtScaleDiv scaleDiv( mediumTicks.first(), mediumTicks.last() + 1, 
+        minorTicks, mediumTicks, majorTicks );
+    return scaleDiv;
+}
+
+void Plot::insertCurve( const QString& title,
+    const QVector<QPointF>& samples, const QColor &color )
+{
+    d_curve = new QwtPlotCurve( title );
+    d_curve->setRenderHint( QwtPlotItem::RenderAntialiased );
+    d_curve->setStyle( QwtPlotCurve::NoCurve );
+    d_curve->setLegendAttribute( QwtPlotCurve::LegendShowSymbol );
+
+    QwtSymbol *symbol = new QwtSymbol( QwtSymbol::XCross );
+    symbol->setSize( 4 );
+    symbol->setPen( color );
+    d_curve->setSymbol( symbol );
+
+    d_curve->setSamples( samples );
+    d_curve->attach( this );
+}
+
+void Plot::insertErrorBars(
+    const QString &title,
+    const QVector<QwtIntervalSample>& samples,
+    const QColor &color )
+{
+    d_intervalCurve = new QwtPlotIntervalCurve( title );
+    d_intervalCurve->setRenderHint( QwtPlotItem::RenderAntialiased );
+    d_intervalCurve->setPen( Qt::white );
+
+    QColor bg( color );
+    bg.setAlpha( 150 );
+    d_intervalCurve->setBrush( QBrush( bg ) );
+    d_intervalCurve->setStyle( QwtPlotIntervalCurve::Tube );
+
+    d_intervalCurve->setSamples( samples );
+    d_intervalCurve->attach( this );
+}
+
+void Plot::setMode( int style )
+{
+    if ( style == Tube )
+    {
+        d_intervalCurve->setStyle( QwtPlotIntervalCurve::Tube );
+        d_intervalCurve->setSymbol( NULL );
+        d_intervalCurve->setRenderHint( QwtPlotItem::RenderAntialiased, true );
+    }
+    else
+    {
+        d_intervalCurve->setStyle( QwtPlotIntervalCurve::NoCurve );
+
+        QColor c( d_intervalCurve->brush().color().rgb() ); // skip alpha
+
+        QwtIntervalSymbol *errorBar =
+            new QwtIntervalSymbol( QwtIntervalSymbol::Bar );
+        errorBar->setWidth( 8 ); // should be something even
+        errorBar->setPen( c );
+
+        d_intervalCurve->setSymbol( errorBar );
+        d_intervalCurve->setRenderHint( QwtPlotItem::RenderAntialiased, false );
+    }
+
+    replot();
+}
+
+void Plot::exportPlot()
+{
+    QwtPlotRenderer renderer;
+    renderer.exportTo( this, "friedberg.pdf" );
+}

examples/friedberg/plot.h

@@ -0,0 +1,43 @@
+#ifndef _PLOT_H_
+#define _PLOT_H_
+
+#include <qwt_plot.h>
+#include <qwt_scale_div.h>
+#include <qwt_series_data.h>
+
+class QwtPlotCurve;
+class QwtPlotIntervalCurve;
+
+class Plot: public QwtPlot
+{
+    Q_OBJECT
+
+public:
+    enum Mode
+    {
+        Bars,
+        Tube
+    };
+
+    Plot( QWidget * = NULL );
+
+public Q_SLOTS:
+    void setMode( int );
+    void exportPlot();
+
+private:
+    void insertCurve( const QString &title,
+        const QVector<QPointF> &, const QColor & );
+
+    void insertErrorBars( const QString &title,
+        const QVector<QwtIntervalSample> &,
+        const QColor &color );
+
+
+    QwtScaleDiv yearScaleDiv() const;
+
+    QwtPlotIntervalCurve *d_intervalCurve;
+    QwtPlotCurve *d_curve;
+};
+
+#endif

examples/itemeditor/editor.cpp

@@ -0,0 +1,374 @@
+#include "editor.h"
+#include <qwt_plot.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_scale_map.h>
+#include <qwt_plot_shapeitem.h>
+#include <qevent.h>
+
+class Overlay: public QwtWidgetOverlay
+{
+public:
+    Overlay( QWidget *parent, Editor *editor ):
+        QwtWidgetOverlay( parent ),
+        d_editor( editor )
+    {
+        switch( editor->mode() )
+        {
+            case Editor::NoMask:
+            {
+                setMaskMode( QwtWidgetOverlay::NoMask );
+                setRenderMode( QwtWidgetOverlay::AutoRenderMode );
+                break;
+            }
+            case Editor::Mask:
+            {
+                setMaskMode( QwtWidgetOverlay::MaskHint );
+                setRenderMode( QwtWidgetOverlay::AutoRenderMode );
+                break;
+            }
+            case Editor::AlphaMask:
+            {
+                setMaskMode( QwtWidgetOverlay::AlphaMask );
+                setRenderMode( QwtWidgetOverlay::AutoRenderMode );
+                break;
+            }
+            case Editor::AlphaMaskRedraw:
+            {
+                setMaskMode( QwtWidgetOverlay::AlphaMask );
+                setRenderMode( QwtWidgetOverlay::DrawOverlay );
+                break;
+            }
+            case Editor::AlphaMaskCopyMask:
+            {
+                setMaskMode( QwtWidgetOverlay::AlphaMask );
+                setRenderMode( QwtWidgetOverlay::CopyAlphaMask );
+                break;
+            }
+        }
+    }
+
+protected:
+    virtual void drawOverlay( QPainter *painter ) const
+    {
+        d_editor->drawOverlay( painter );
+    }
+
+    virtual QRegion maskHint() const
+    {
+        return d_editor->maskHint();
+    }
+
+private:
+    Editor *d_editor;
+};
+
+Editor::Editor( QwtPlot* plot ):
+    QObject( plot ),
+    d_isEnabled( false ),
+    d_overlay( NULL ),
+    d_mode( Mask )
+{
+    setEnabled( true );
+}
+
+
+Editor::~Editor()
+{
+    delete d_overlay;
+}
+
+QwtPlot *Editor::plot()
+{
+    return qobject_cast<QwtPlot *>( parent() );
+}
+
+const QwtPlot *Editor::plot() const
+{
+    return qobject_cast<const QwtPlot *>( parent() );
+}
+
+void Editor::setMode( Mode mode )
+{
+    d_mode = mode;
+}
+
+Editor::Mode Editor::mode() const
+{
+    return d_mode;
+}
+
+void Editor::setEnabled( bool on )
+{
+    if ( on == d_isEnabled )
+        return;
+
+    QwtPlot *plot = qobject_cast<QwtPlot *>( parent() );
+    if ( plot )
+    {
+        d_isEnabled = on;
+
+        if ( on )
+        {
+            plot->canvas()->installEventFilter( this );
+        }
+        else
+        {
+            plot->canvas()->removeEventFilter( this );
+
+            delete d_overlay;
+            d_overlay = NULL;
+        }
+    }
+}
+
+bool Editor::isEnabled() const
+{
+    return d_isEnabled;
+}
+
+bool Editor::eventFilter( QObject* object, QEvent* event )
+{
+    QwtPlot *plot = qobject_cast<QwtPlot *>( parent() );
+    if ( plot && object == plot->canvas() )
+    {
+        switch( event->type() )
+        {
+            case QEvent::MouseButtonPress:
+            {
+                const QMouseEvent* mouseEvent =
+                    dynamic_cast<QMouseEvent* >( event );
+
+                if ( d_overlay == NULL && 
+                    mouseEvent->button() == Qt::LeftButton  )
+                {
+                    const bool accepted = pressed( mouseEvent->pos() );
+                    if ( accepted )
+                    {
+                        d_overlay = new Overlay( plot->canvas(), this );
+
+                        d_overlay->updateOverlay();
+                        d_overlay->show();
+                    }
+                }
+
+                break;
+            }
+            case QEvent::MouseMove:
+            {
+                if ( d_overlay )
+                {
+                    const QMouseEvent* mouseEvent =
+                        dynamic_cast< QMouseEvent* >( event );
+
+                    const bool accepted = moved( mouseEvent->pos() );
+                    if ( accepted )
+                        d_overlay->updateOverlay();
+                }
+
+                break;
+            }
+            case QEvent::MouseButtonRelease:
+            {
+                const QMouseEvent* mouseEvent =
+                    static_cast<QMouseEvent* >( event );
+
+                if ( d_overlay && mouseEvent->button() == Qt::LeftButton )
+                {
+                    released( mouseEvent->pos() );
+
+                    delete d_overlay;
+                    d_overlay = NULL;
+                }
+
+                break;
+            }
+            default:
+                break;
+        }
+
+        return false;
+    }
+
+    return QObject::eventFilter( object, event );
+}
+
+bool Editor::pressed( const QPoint& pos )
+{
+    d_editedItem = itemAt( pos );
+    if ( d_editedItem )
+    {
+        d_currentPos = pos;
+        setItemVisible( d_editedItem, false );
+
+        return true;
+    }
+
+    return false; // don't accept the position
+}
+
+bool Editor::moved( const QPoint& pos )
+{
+    if ( plot() == NULL )
+        return false;
+
+    const QwtScaleMap xMap = plot()->canvasMap( d_editedItem->xAxis() );
+    const QwtScaleMap yMap = plot()->canvasMap( d_editedItem->yAxis() );
+
+    const QPointF p1 = QwtScaleMap::invTransform( xMap, yMap, d_currentPos );
+    const QPointF p2 = QwtScaleMap::invTransform( xMap, yMap, pos );
+
+#if QT_VERSION >= 0x040600
+    const QPainterPath shape = d_editedItem->shape().translated( p2 - p1 );
+#else
+    const double dx = p2.x() - p1.x();
+    const double dy = p2.y() - p1.y();
+
+    QPainterPath shape = d_editedItem->shape();
+    for ( int i = 0; i < shape.elementCount(); i++ )
+    {
+        const QPainterPath::Element &el = shape.elementAt( i );
+        shape.setElementPositionAt( i, el.x + dx, el.y + dy );
+    }
+#endif
+
+    d_editedItem->setShape( shape );
+    d_currentPos = pos;
+
+    return true;
+}
+
+void Editor::released( const QPoint& pos )
+{
+    Q_UNUSED( pos );
+
+    if ( d_editedItem  )
+    {
+        raiseItem( d_editedItem );
+        setItemVisible( d_editedItem, true );
+    }
+}
+
+QwtPlotShapeItem* Editor::itemAt( const QPoint& pos ) const
+{
+    const QwtPlot *plot = this->plot();
+    if ( plot == NULL )
+        return NULL;
+
+    // translate pos into the plot coordinates
+    double coords[ QwtPlot::axisCnt ];
+    coords[ QwtPlot::xBottom ] =
+        plot->canvasMap( QwtPlot::xBottom ).invTransform( pos.x() );
+    coords[ QwtPlot::xTop ] =
+        plot->canvasMap( QwtPlot::xTop ).invTransform( pos.x() );
+    coords[ QwtPlot::yLeft ] =
+        plot->canvasMap( QwtPlot::yLeft ).invTransform( pos.y() );
+    coords[ QwtPlot::yRight ] =
+        plot->canvasMap( QwtPlot::yRight ).invTransform( pos.y() );
+
+    QwtPlotItemList items = plot->itemList();
+    for ( int i = items.size() - 1; i >= 0; i-- )
+    {
+        QwtPlotItem *item = items[ i ];
+        if ( item->isVisible() &&
+            item->rtti() == QwtPlotItem::Rtti_PlotShape )
+        {
+            QwtPlotShapeItem *shapeItem = static_cast<QwtPlotShapeItem *>( item );
+            const QPointF p( coords[ item->xAxis() ], coords[ item->yAxis() ] );
+
+            if ( shapeItem->boundingRect().contains( p )
+                && shapeItem->shape().contains( p ) )
+            {
+                return shapeItem;
+            }
+        }
+    }
+
+    return NULL;
+}
+
+QRegion Editor::maskHint() const
+{
+    return maskHint( d_editedItem );
+}
+
+QRegion Editor::maskHint( QwtPlotShapeItem *shapeItem ) const
+{
+    const QwtPlot *plot = this->plot();
+    if ( plot == NULL || shapeItem == NULL )
+        return QRegion();
+
+    const QwtScaleMap xMap = plot->canvasMap( shapeItem->xAxis() );
+    const QwtScaleMap yMap = plot->canvasMap( shapeItem->yAxis() );
+
+    QRect rect = QwtScaleMap::transform( xMap, yMap,
+        shapeItem->shape().boundingRect() ).toRect();
+
+    const int m = 5; // some margin for the pen
+    return rect.adjusted( -m, -m, m, m );
+}
+
+void Editor::drawOverlay( QPainter* painter ) const
+{
+    const QwtPlot *plot = this->plot();
+    if ( plot == NULL || d_editedItem == NULL )
+        return;
+
+    const QwtScaleMap xMap = plot->canvasMap( d_editedItem->xAxis() );
+    const QwtScaleMap yMap = plot->canvasMap( d_editedItem->yAxis() );
+
+    painter->setRenderHint( QPainter::Antialiasing,
+        d_editedItem->testRenderHint( QwtPlotItem::RenderAntialiased ) );
+    d_editedItem->draw( painter, xMap, yMap,
+        plot->canvas()->contentsRect() );
+}
+
+void Editor::raiseItem( QwtPlotShapeItem *shapeItem )
+{
+    const QwtPlot *plot = this->plot();
+    if ( plot == NULL || shapeItem == NULL )
+        return;
+
+    const QwtPlotItemList items = plot->itemList();
+    for ( int i = items.size() - 1; i >= 0; i-- )
+    {
+        QwtPlotItem *item = items[ i ];
+        if ( shapeItem == item )
+            return;
+
+        if ( item->isVisible() &&
+            item->rtti() == QwtPlotItem::Rtti_PlotShape )
+        {
+            shapeItem->setZ( item->z() + 1 );
+            return;
+        }
+    }
+}
+
+void Editor::setItemVisible( QwtPlotShapeItem *item, bool on )
+{
+    if ( plot() == NULL || item == NULL || item->isVisible() == on )
+        return;
+
+    const bool doAutoReplot = plot()->autoReplot();
+    plot()->setAutoReplot( false );
+
+    item->setVisible( on );
+
+    plot()->setAutoReplot( doAutoReplot );
+
+    /*
+      Avoid replot with a full repaint of the canvas. 
+      For special combinations - f.e. using the 
+      raster paint engine on a remote display -
+      this makes a difference.
+     */
+
+    QwtPlotCanvas *canvas =
+        qobject_cast<QwtPlotCanvas *>( plot()->canvas() );
+    if ( canvas )
+        canvas->invalidateBackingStore();
+
+    plot()->canvas()->update( maskHint( item ) );
+
+}
+

examples/itemeditor/editor.h

@@ -0,0 +1,66 @@
+#ifndef _EDITOR_H_
+#define _EDITOR_H_
+
+#include <qobject.h>
+#include <qregion.h>
+#include <qpointer.h>
+#include <qwt_widget_overlay.h>
+
+class QwtPlot;
+class QwtPlotShapeItem;
+class QPainter;
+class QPoint;
+
+class Editor: public QObject
+{
+    Q_OBJECT
+
+public:
+    enum Mode
+    {
+        NoMask,
+        Mask,
+        AlphaMask,
+        AlphaMaskRedraw,
+        AlphaMaskCopyMask
+    };
+
+    Editor( QwtPlot * );
+    virtual ~Editor();
+
+    const QwtPlot *plot() const;
+    QwtPlot *plot();
+
+    virtual void setEnabled( bool on );
+    bool isEnabled() const;
+
+    void drawOverlay( QPainter * ) const;
+    QRegion maskHint() const;
+
+    virtual bool eventFilter( QObject *, QEvent *);
+
+    void setMode( Mode mode );
+    Mode mode() const;
+
+private:
+    bool pressed( const QPoint & );
+    bool moved( const QPoint & );
+    void released( const QPoint & );
+
+    QwtPlotShapeItem* itemAt( const QPoint& ) const;
+    void raiseItem( QwtPlotShapeItem * );
+
+    QRegion maskHint( QwtPlotShapeItem * ) const;
+    void setItemVisible( QwtPlotShapeItem *item, bool on );
+
+    bool d_isEnabled;
+    QPointer<QwtWidgetOverlay> d_overlay;
+
+    // Mouse positions
+    QPointF d_currentPos;
+    QwtPlotShapeItem* d_editedItem;
+
+    Mode d_mode;
+};
+
+#endif

examples/itemeditor/itemeditor.pro

@@ -0,0 +1,24 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET       = itemeditor
+
+HEADERS = \
+    editor.h \
+    shapefactory.h \
+    plot.h
+
+SOURCES = \
+    editor.cpp \
+    shapefactory.cpp \
+    plot.cpp \
+    main.cpp
+

examples/itemeditor/main.cpp

@@ -0,0 +1,54 @@
+#include "plot.h"
+#include <qapplication.h>
+#include <qmainwindow.h>
+#include <qtoolbar.h>
+#include <qtoolbutton.h>
+#include <qcombobox.h>
+
+class MainWindow: public QMainWindow
+{
+public:
+    MainWindow( QWidget * = NULL );
+};
+
+MainWindow::MainWindow( QWidget *parent ):
+    QMainWindow( parent )
+{
+    Plot *plot = new Plot( this );
+    setCentralWidget( plot );
+
+    QToolBar *toolBar = new QToolBar( this );
+
+    QComboBox *modeBox = new QComboBox( toolBar );
+    modeBox->addItem( "No Mask" );
+    modeBox->addItem( "Mask" );
+    modeBox->addItem( "Alpha Mask" );
+    modeBox->addItem( "Alpha Mask/Redraw" );
+    modeBox->addItem( "Alpha Mask/Copy Mask" );
+    modeBox->setCurrentIndex( 1 );
+    modeBox->setSizePolicy( QSizePolicy::Fixed, QSizePolicy::Fixed );
+
+    connect( modeBox, SIGNAL( currentIndexChanged( int ) ),
+             plot, SLOT( setMode( int ) ) );
+
+    QToolButton *btnExport = new QToolButton( toolBar );
+    btnExport->setText( "Export" );
+    btnExport->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+    connect( btnExport, SIGNAL( clicked() ), plot, SLOT( exportPlot() ) );
+
+    toolBar->addWidget( modeBox );
+    toolBar->addWidget( btnExport );
+    addToolBar( toolBar );
+
+}
+
+int main( int argc, char **argv )
+{
+    QApplication app( argc, argv );
+
+    MainWindow window;
+    window.resize( 600, 400 );
+    window.show();
+
+    return app.exec();
+}

examples/itemeditor/plot.cpp

@@ -0,0 +1,120 @@
+#include "plot.h"
+#include "editor.h"
+#include <qwt_plot_shapeitem.h>
+#include <qwt_plot_magnifier.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_legend.h>
+#include <qwt_plot_renderer.h>
+
+class Legend: public QwtLegend
+{
+protected:
+    virtual QWidget *createWidget( const QwtLegendData &data ) const
+    {
+        QWidget *w = QwtLegend::createWidget( data );
+        if ( w )
+        {
+            w->setStyleSheet(
+                "border-radius: 5px;"
+                "padding: 2px;"
+                "background: LemonChiffon;"
+            );
+        }
+
+        return w;
+    }
+};
+
+Plot::Plot( QWidget *parent ):
+    QwtPlot( parent )
+{
+    setAutoReplot( false );
+
+    setTitle( "Movable Items" );
+
+    const int margin = 5;
+    setContentsMargins( margin, margin, margin, margin );
+
+    setAutoFillBackground( true );
+    setPalette( QColor( "DimGray" ).lighter( 110 ) );
+
+    QwtPlotCanvas *canvas = new QwtPlotCanvas();
+#if 0
+    // a gradient making a replot slow on X11
+    canvas->setStyleSheet(
+        "border: 2px solid Black;"
+        "border-radius: 15px;"
+        "background-color: qlineargradient( x1: 0, y1: 0, x2: 0, y2: 1,"
+            "stop: 0 LemonChiffon, stop: 0.5 PaleGoldenrod, stop: 1 LemonChiffon );"
+    );
+#else
+    canvas->setStyleSheet(
+        "border: 2px inset DimGray;"
+        "border-radius: 15px;"
+        "background: LemonChiffon;"
+    );
+#endif
+
+    setCanvas( canvas );
+    insertLegend( new Legend(), QwtPlot::RightLegend );
+
+    populate();
+
+    updateAxes();
+    for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
+        setAxisAutoScale( axis, false );
+
+    d_editor = new Editor( this );
+    ( void ) new QwtPlotMagnifier( canvas );
+}
+
+void Plot::populate()
+{
+    addShape( "Rectangle", ShapeFactory::Rect, "RoyalBlue", 
+        QPointF( 30.0, 50.0 ), QSizeF( 40.0, 50.0 ) );
+    addShape( "Ellipse", ShapeFactory::Ellipse, "IndianRed", 
+        QPointF( 80.0, 130.0 ), QSizeF( 50.0, 40.0 ) );
+    addShape( "Ring", ShapeFactory::Ring, "DarkOliveGreen", 
+        QPointF( 30.0, 165.0 ), QSizeF( 40.0, 40.0 ) );
+    addShape( "Triangle", ShapeFactory::Triangle, "SandyBrown", 
+        QPointF( 165.0, 165.0 ), QSizeF( 60.0, 40.0 ) );
+    addShape( "Star", ShapeFactory::Star, "DarkViolet", 
+        QPointF( 165.0, 50.0 ), QSizeF( 40.0, 50.0 ) );
+    addShape( "Hexagon", ShapeFactory::Hexagon, "DarkSlateGray", 
+        QPointF( 120.0, 70.0 ), QSizeF( 50.0, 50.0 ) );
+
+}
+
+void Plot::addShape( const QString &title,
+    ShapeFactory::Shape shape, const QColor &color, 
+    const QPointF &pos, const QSizeF &size )
+{
+    QwtPlotShapeItem *item = new QwtPlotShapeItem( title );
+    item->setItemAttribute( QwtPlotItem::Legend, true );
+    item->setLegendMode( QwtPlotShapeItem::LegendShape );
+    item->setLegendIconSize( QSize( 20, 20 ) );
+    item->setRenderHint( QwtPlotItem::RenderAntialiased, true );
+    item->setShape( ShapeFactory::path( shape, pos, size ) );
+
+    QColor fillColor = color;
+    fillColor.setAlpha( 200 );
+
+    QPen pen( color, 3 );
+    pen.setJoinStyle( Qt::MiterJoin );
+    item->setPen( pen );
+    item->setBrush( fillColor );
+
+    item->attach( this );
+}
+
+void Plot::exportPlot()
+{
+    QwtPlotRenderer renderer;
+    renderer.exportTo( this, "shapes.pdf" );
+}
+
+void Plot::setMode( int mode )
+{
+    d_editor->setMode( static_cast<Editor::Mode>( mode ) );
+}
+

examples/itemeditor/plot.h

@@ -0,0 +1,33 @@
+#ifndef _PLOT_H
+#define _PLOT_H
+
+#include <qwt_plot.h>
+#include "shapefactory.h"
+
+class QColor;
+class QSizeF;
+class QPointF;
+class Editor;
+
+class Plot: public QwtPlot
+{
+    Q_OBJECT
+
+public:
+    Plot( QWidget *parent = NULL );
+
+public Q_SLOTS:
+    void exportPlot();
+    void setMode( int );
+    
+private:
+    void populate();
+
+    void addShape( const QString &title,
+        ShapeFactory::Shape, const QColor &,
+        const QPointF &, const QSizeF & );
+
+    Editor *d_editor;
+};
+
+#endif

examples/itemeditor/shapefactory.cpp

@@ -0,0 +1,113 @@
+#include "shapefactory.h"
+
+QPainterPath ShapeFactory::path( Shape shape, 
+    const QPointF &pos, const QSizeF &size )
+{
+    QRectF rect;
+    rect.setSize( size );
+    rect.moveCenter( pos );
+    
+    QPainterPath path;
+
+    switch( shape )
+    {
+        case Rect:
+        {
+            path.addRect( rect );
+            break;
+        }
+        case Triangle:
+        {
+            QPolygonF triangle;
+            triangle += rect.bottomLeft();
+            triangle += QPointF( rect.center().x(), rect.top() );
+            triangle += rect.bottomRight();
+
+            path.addPolygon( triangle );
+            break;
+        }
+        case Ellipse:
+        {
+            path.addEllipse( rect );
+            break;
+        }
+        case Ring:
+        {
+            path.addEllipse( rect );
+
+            const double w = 0.25 * rect.width();
+            path.addEllipse( rect.adjusted( w, w, -w, -w ) );
+            break;
+        }
+        case Star:
+        {
+            const double cos30 = 0.866025;
+
+            const double dy = 0.25 * size.height();
+            const double dx = 0.5 * size.width() * cos30 / 3.0;
+
+            double x1 = pos.x() - 3 * dx;
+            double y1 = pos.y() - 2 * dy;
+
+            const double x2 = x1 + 1 * dx;
+            const double x3 = x1 + 2 * dx;
+            const double x4 = x1 + 3 * dx;
+            const double x5 = x1 + 4 * dx;
+            const double x6 = x1 + 5 * dx;
+            const double x7 = x1 + 6 * dx;
+
+            const double y2 = y1 + 1 * dy;
+            const double y3 = y1 + 2 * dy;
+            const double y4 = y1 + 3 * dy;
+            const double y5 = y1 + 4 * dy;
+
+            QPolygonF star;
+            star += QPointF( x4, y1 );
+            star += QPointF( x5, y2 );
+            star += QPointF( x7, y2 );
+            star += QPointF( x6, y3 );
+            star += QPointF( x7, y4 );
+            star += QPointF( x5, y4 );
+            star += QPointF( x4, y5 );
+            star += QPointF( x3, y4 );
+            star += QPointF( x1, y4 );
+            star += QPointF( x2, y3 );
+            star += QPointF( x1, y2 );
+            star += QPointF( x3, y2 );
+
+            path.addPolygon( star );
+            break;
+        }
+        case Hexagon:
+        {
+            const double cos30 = 0.866025; 
+
+            const double dx = 0.5 * size.width() - cos30;
+            const double dy = 0.25 * size.height();
+
+            double x1 = pos.x() - dx;
+            double y1 = pos.y() - 2 * dy;
+
+            const double x2 = x1 + 1 * dx;
+            const double x3 = x1 + 2 * dx;
+
+            const double y2 = y1 + 1 * dy;
+            const double y3 = y1 + 3 * dy;
+            const double y4 = y1 + 4 * dy;
+
+            QPolygonF hexagon;
+            hexagon += QPointF( x2, y1 );
+            hexagon += QPointF( x3, y2 );
+            hexagon += QPointF( x3, y3 );
+            hexagon += QPointF( x2, y4 );
+            hexagon += QPointF( x1, y3 );
+            hexagon += QPointF( x1, y2 );
+
+            path.addPolygon( hexagon );
+            break;
+        }
+    };
+
+    path.closeSubpath();
+    return path;
+}

examples/itemeditor/shapefactory.h

@@ -0,0 +1,21 @@
+#ifndef _SHAPE_FACTORY_H_
+#define _SHAPE_FACTORY_H_
+
+#include <qpainterpath.h>
+
+namespace ShapeFactory
+{
+    enum Shape
+    {
+        Rect,
+        Triangle,
+        Ellipse,
+        Ring,
+        Star,
+        Hexagon
+    };
+
+    QPainterPath path( Shape, const QPointF &, const QSizeF & );
+};
+
+#endif

examples/legends/legends.pro

@@ -0,0 +1,24 @@
+################################################################
+# Qwt Widget Library
+# Copyright (C) 1997   Josef Wilgen
+# Copyright (C) 2002   Uwe Rathmann
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the Qwt License, Version 1.0
+################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET       = legends
+
+HEADERS = \
+    mainwindow.h \
+    panel.h \
+    settings.h \
+    plot.h
+
+SOURCES = \
+    mainwindow.cpp \
+    panel.cpp \
+    plot.cpp \
+    main.cpp

examples/legends/main.cpp

@@ -0,0 +1,14 @@
+#include <qapplication.h>
+#include "mainwindow.h"
+
+int main ( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+    a.setStyle( "Windows" );
+
+    MainWindow w;
+    w.resize( 700, 500 );
+    w.show();
+
+    return a.exec();
+}

examples/legends/mainwindow.cpp

@@ -0,0 +1,61 @@
+#include <qtoolbar.h>
+#include <qtoolbutton.h>
+#include <qlayout.h>
+#include <qwt_plot_renderer.h>
+#include <qwt_plot_canvas.h>
+#include "plot.h"
+#include "panel.h"
+#include "mainwindow.h"
+
+MainWindow::MainWindow( QWidget *parent ):
+    QMainWindow( parent )
+{
+    d_plot = new Plot();
+
+    Settings settings;
+    settings.legend.isEnabled = true;
+    settings.legend.position = QwtPlot::BottomLegend;
+
+    settings.legendItem.isEnabled = false;
+    settings.legendItem.numColumns = 1;
+    settings.legendItem.alignment = Qt::AlignRight | Qt::AlignVCenter;
+    settings.legendItem.backgroundMode = 0;
+    settings.legendItem.size = d_plot->canvas()->font().pointSize();
+
+    settings.curve.numCurves = 4;
+    settings.curve.title = "Curve";
+    
+    d_panel = new Panel();
+    d_panel->setSettings( settings );
+
+    QWidget *box = new QWidget( this );
+    QHBoxLayout *layout = new QHBoxLayout( box );
+    layout->addWidget( d_plot, 10 );
+    layout->addWidget( d_panel );
+
+    setCentralWidget( box );
+
+    QToolBar *toolBar = new QToolBar( this );
+
+    QToolButton *btnExport = new QToolButton( toolBar );
+    btnExport->setText( "Export" );
+    toolBar->addWidget( btnExport );
+
+    addToolBar( toolBar );
+
+    updatePlot();
+
+    connect( d_panel, SIGNAL( edited() ), SLOT( updatePlot() ) );
+    connect( btnExport, SIGNAL( clicked() ), SLOT( exportPlot() ) );
+}
+
+void MainWindow::updatePlot()
+{
+    d_plot->applySettings( d_panel->settings() );
+}
+
+void MainWindow::exportPlot()
+{
+    QwtPlotRenderer renderer;
+    renderer.exportTo( d_plot, "legends.pdf" );
+}

examples/legends/mainwindow.h

@@ -0,0 +1,20 @@
+#include <qmainwindow.h>
+
+class Plot;
+class Panel;
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow( QWidget *parent = 0 );
+
+private Q_SLOTS:
+    void updatePlot();
+    void exportPlot();
+
+private:
+    Plot *d_plot;
+    Panel *d_panel;
+};

examples/legends/panel.cpp

@@ -0,0 +1,216 @@
+#include "panel.h"
+#include "settings.h"
+#include <qcheckbox.h>
+#include <qspinbox.h>
+#include <qcombobox.h>
+#include <qgroupbox.h>
+#include <qlayout.h>
+#include <qlabel.h>
+#include <qlineedit.h>
+#include <qwt_plot.h>
+#include <qwt_plot_legenditem.h>
+
+Panel::Panel( QWidget *parent ):
+    QWidget( parent )
+{
+    // create widgets
+
+    d_legend.checkBox = new QCheckBox( "Enabled" );
+
+    d_legend.positionBox = new QComboBox();
+    d_legend.positionBox->addItem( "Left", QwtPlot::LeftLegend );
+    d_legend.positionBox->addItem( "Right", QwtPlot::RightLegend );
+    d_legend.positionBox->addItem( "Bottom", QwtPlot::BottomLegend );
+    d_legend.positionBox->addItem( "Top", QwtPlot::TopLegend );
+    d_legend.positionBox->addItem( "External", QwtPlot::TopLegend + 1 );
+
+    d_legendItem.checkBox = new QCheckBox( "Enabled" );
+
+    d_legendItem.numColumnsBox = new QSpinBox();
+    d_legendItem.numColumnsBox->setRange( 0, 10 );
+    d_legendItem.numColumnsBox->setSpecialValueText( "Unlimited" );
+
+    d_legendItem.hAlignmentBox = new QComboBox();
+    d_legendItem.hAlignmentBox->addItem( "Left", Qt::AlignLeft );
+    d_legendItem.hAlignmentBox->addItem( "Centered", Qt::AlignHCenter );
+    d_legendItem.hAlignmentBox->addItem( "Right", Qt::AlignRight );
+    
+    d_legendItem.vAlignmentBox = new QComboBox();
+    d_legendItem.vAlignmentBox->addItem( "Top", Qt::AlignTop );
+    d_legendItem.vAlignmentBox->addItem( "Centered", Qt::AlignVCenter );
+    d_legendItem.vAlignmentBox->addItem( "Bottom", Qt::AlignBottom );
+
+    d_legendItem.backgroundBox = new QComboBox();
+    d_legendItem.backgroundBox->addItem( "Legend",
+        QwtPlotLegendItem::LegendBackground );
+    d_legendItem.backgroundBox->addItem( "Items",
+        QwtPlotLegendItem::ItemBackground );
+
+    d_legendItem.sizeBox = new QSpinBox();
+    d_legendItem.sizeBox->setRange( 8, 22 );
+
+    d_curve.numCurves = new QSpinBox();
+    d_curve.numCurves->setRange( 0, 99 );
+
+    d_curve.title = new QLineEdit();
+
+    // layout
+
+    QGroupBox *legendBox = new QGroupBox( "Legend" );
+    QGridLayout *legendBoxLayout = new QGridLayout( legendBox );
+
+    int row = 0;
+    legendBoxLayout->addWidget( d_legend.checkBox, row, 0, 1, -1 );
+
+    row++;
+    legendBoxLayout->addWidget( new QLabel( "Position" ), row, 0 );
+    legendBoxLayout->addWidget( d_legend.positionBox, row, 1 );
+
+
+    QGroupBox *legendItemBox = new QGroupBox( "Legend Item" );
+    QGridLayout *legendItemBoxLayout = new QGridLayout( legendItemBox );
+
+    row = 0;
+    legendItemBoxLayout->addWidget( d_legendItem.checkBox, row, 0, 1, -1 );
+
+    row++;
+    legendItemBoxLayout->addWidget( new QLabel( "Columns" ), row, 0 );
+    legendItemBoxLayout->addWidget( d_legendItem.numColumnsBox, row, 1 );
+
+    row++;
+    legendItemBoxLayout->addWidget( new QLabel( "Horizontal" ), row, 0 );
+    legendItemBoxLayout->addWidget( d_legendItem.hAlignmentBox, row, 1 );
+
+    row++;
+    legendItemBoxLayout->addWidget( new QLabel( "Vertical" ), row, 0 );
+    legendItemBoxLayout->addWidget( d_legendItem.vAlignmentBox, row, 1 );
+
+    row++;
+    legendItemBoxLayout->addWidget( new QLabel( "Background" ), row, 0 );
+    legendItemBoxLayout->addWidget( d_legendItem.backgroundBox, row, 1 );
+
+    row++;
+    legendItemBoxLayout->addWidget( new QLabel( "Size" ), row, 0 );
+    legendItemBoxLayout->addWidget( d_legendItem.sizeBox, row, 1 );
+
+    QGroupBox *curveBox = new QGroupBox( "Curves" );
+    QGridLayout *curveBoxLayout = new QGridLayout( curveBox );
+
+    row = 0;
+    curveBoxLayout->addWidget( new QLabel( "Number" ), row, 0 );
+    curveBoxLayout->addWidget( d_curve.numCurves, row, 1 );
+
+    row++;
+    curveBoxLayout->addWidget( new QLabel( "Title" ), row, 0 );
+    curveBoxLayout->addWidget( d_curve.title, row, 1 );
+
+    QVBoxLayout *layout = new QVBoxLayout( this );
+    layout->addWidget( legendBox );
+    layout->addWidget( legendItemBox );
+    layout->addWidget( curveBox );
+    layout->addStretch( 10 );
+
+    connect( d_legend.checkBox, 
+        SIGNAL( stateChanged( int ) ), SIGNAL( edited() ) );
+    connect( d_legend.positionBox, 
+        SIGNAL( currentIndexChanged( int ) ), SIGNAL( edited() ) );
+
+    connect( d_legendItem.checkBox, 
+        SIGNAL( stateChanged( int ) ), SIGNAL( edited() ) );
+    connect( d_legendItem.numColumnsBox, 
+        SIGNAL( valueChanged( int ) ), SIGNAL( edited() ) );
+    connect( d_legendItem.hAlignmentBox, 
+        SIGNAL( currentIndexChanged( int ) ), SIGNAL( edited() ) );
+    connect( d_legendItem.vAlignmentBox, 
+        SIGNAL( currentIndexChanged( int ) ), SIGNAL( edited() ) );
+    connect( d_legendItem.backgroundBox, 
+        SIGNAL( currentIndexChanged( int ) ), SIGNAL( edited() ) );
+    connect( d_curve.numCurves, 
+        SIGNAL( valueChanged( int ) ), SIGNAL( edited() ) );
+    connect( d_legendItem.sizeBox, 
+        SIGNAL( valueChanged( int ) ), SIGNAL( edited() ) );
+    connect( d_curve.title, 
+        SIGNAL( textEdited( const QString & ) ), SIGNAL( edited() ) );
+}
+
+void Panel::setSettings( const Settings &settings)
+{
+    blockSignals( true );
+
+    d_legend.checkBox->setCheckState(
+        settings.legend.isEnabled ? Qt::Checked : Qt::Unchecked );
+    d_legend.positionBox->setCurrentIndex( settings.legend.position );
+
+    d_legendItem.checkBox->setCheckState(
+        settings.legendItem.isEnabled ? Qt::Checked : Qt::Unchecked );
+
+    d_legendItem.numColumnsBox->setValue( settings.legendItem.numColumns );
+
+    int align = settings.legendItem.alignment;
+
+    if ( align & Qt::AlignLeft )
+        d_legendItem.hAlignmentBox->setCurrentIndex( 0 );
+    else if ( align & Qt::AlignRight )
+        d_legendItem.hAlignmentBox->setCurrentIndex( 2 );
+    else
+        d_legendItem.hAlignmentBox->setCurrentIndex( 1 );
+
+    if ( align & Qt::AlignTop )
+        d_legendItem.vAlignmentBox->setCurrentIndex( 0 );
+    else if ( align & Qt::AlignBottom )
+        d_legendItem.vAlignmentBox->setCurrentIndex( 2 );
+    else
+        d_legendItem.vAlignmentBox->setCurrentIndex( 1 );
+
+    d_legendItem.backgroundBox->setCurrentIndex( 
+        settings.legendItem.backgroundMode );
+
+    d_legendItem.sizeBox->setValue( settings.legendItem.size );
+
+    d_curve.numCurves->setValue( settings.curve.numCurves );
+    d_curve.title->setText( settings.curve.title );
+
+    blockSignals( false );
+}
+
+Settings Panel::settings() const
+{
+    Settings s;
+
+    s.legend.isEnabled = 
+        d_legend.checkBox->checkState() == Qt::Checked;
+    s.legend.position = d_legend.positionBox->currentIndex();
+
+    s.legendItem.isEnabled = 
+        d_legendItem.checkBox->checkState() == Qt::Checked;
+    s.legendItem.numColumns = d_legendItem.numColumnsBox->value();
+    
+    int align = 0;
+
+    int hIndex = d_legendItem.hAlignmentBox->currentIndex();
+    if ( hIndex == 0 )
+        align |= Qt::AlignLeft;
+    else if ( hIndex == 2 )
+        align |= Qt::AlignRight;
+    else
+        align |= Qt::AlignHCenter;
+
+    int vIndex = d_legendItem.vAlignmentBox->currentIndex();
+    if ( vIndex == 0 )
+        align |= Qt::AlignTop;
+    else if ( vIndex == 2 )
+        align |= Qt::AlignBottom;
+    else
+        align |= Qt::AlignVCenter;
+
+    s.legendItem.alignment = align;
+
+    s.legendItem.backgroundMode = 
+            d_legendItem.backgroundBox->currentIndex();
+    s.legendItem.size = d_legendItem.sizeBox->value();
+
+    s.curve.numCurves = d_curve.numCurves->value();
+    s.curve.title = d_curve.title->text();
+
+    return s;
+}

examples/legends/panel.h

@@ -0,0 +1,52 @@
+#ifndef _PANEL_
+#define _PANEL_
+
+#include "settings.h"
+#include <qwidget.h>
+
+class QCheckBox;
+class QComboBox;
+class QSpinBox;
+class QLineEdit;
+
+class Panel: public QWidget
+{
+    Q_OBJECT
+
+public:
+    Panel( QWidget *parent = NULL );
+
+    void setSettings( const Settings &);
+    Settings settings() const;
+    
+Q_SIGNALS:
+    void edited();
+
+private:
+    struct
+    {
+        QCheckBox *checkBox;
+        QComboBox *positionBox;
+
+    } d_legend;
+
+    struct
+    {
+        QCheckBox *checkBox;
+        QSpinBox *numColumnsBox;
+        QComboBox *hAlignmentBox;
+        QComboBox *vAlignmentBox;
+        QComboBox *backgroundBox;
+        QSpinBox *sizeBox;
+
+    } d_legendItem;
+
+    struct
+    {
+        QSpinBox *numCurves;
+        QLineEdit *title;
+
+    } d_curve;
+};
+
+#endif

examples/legends/plot.cpp

@@ -0,0 +1,263 @@
+#include "plot.h"
+#include "settings.h"
+#include <qwt_plot_curve.h>
+#include <qwt_plot_legenditem.h>
+#include <qwt_legend.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_grid.h>
+#include <qwt_plot_layout.h>
+
+class LegendItem: public QwtPlotLegendItem
+{
+public:
+    LegendItem()
+    {
+        setRenderHint( QwtPlotItem::RenderAntialiased );
+
+        QColor color( Qt::white );
+
+        setTextPen( color );
+#if 1
+        setBorderPen( color );
+
+        QColor c( Qt::gray );
+        c.setAlpha( 200 );
+
+        setBackgroundBrush( c );
+#endif
+    }
+};
+
+class Curve: public QwtPlotCurve
+{
+public:
+    Curve( int index ):
+        d_index( index )
+    {
+        setRenderHint( QwtPlotItem::RenderAntialiased );
+        initData();
+    }
+
+    void setCurveTitle( const QString &title )
+    {
+        QString txt("%1 %2");
+        setTitle( QString( "%1 %2" ).arg( title ).arg( d_index ) );
+    }
+
+    void initData()
+    {
+        QVector<QPointF> points;
+
+        double y = qrand() % 1000;
+
+        for ( double x = 0.0; x <= 1000.0; x += 100.0 )
+        {
+            double off = qrand() % 200 - 100;
+            if ( y + off > 980.0 || y + off < 20.0 )
+                off = -off;
+
+            y += off;
+
+            points += QPointF( x, y );
+        }
+
+        setSamples( points );
+    }
+
+private:
+    const int d_index;
+};
+
+Plot::Plot( QWidget *parent ):
+    QwtPlot( parent ),
+    d_externalLegend( NULL ),
+    d_legendItem( NULL ),
+    d_isDirty( false )
+{
+    QwtPlotCanvas *canvas = new QwtPlotCanvas();
+    canvas->setFocusIndicator( QwtPlotCanvas::CanvasFocusIndicator );
+    canvas->setFocusPolicy( Qt::StrongFocus );
+    canvas->setPalette( Qt::black );
+    setCanvas( canvas );
+
+    setAutoReplot( false );
+
+    setTitle( "Legend Test" );
+    setFooter( "Footer" );
+
+    // grid
+    QwtPlotGrid *grid = new QwtPlotGrid;
+    grid->enableXMin( true );
+    grid->setMajorPen( Qt::gray, 0, Qt::DotLine );
+    grid->setMinorPen( Qt::darkGray, 0, Qt::DotLine );
+    grid->attach( this );
+
+    // axis
+    setAxisScale( QwtPlot::yLeft, 0.0, 1000.0 );
+    setAxisScale( QwtPlot::xBottom, 0.0, 1000.0 );
+}
+
+Plot::~Plot()
+{
+    delete d_externalLegend;
+}
+
+void Plot::insertCurve()
+{
+    static int counter = 1;
+
+    const char *colors[] = 
+    { 
+        "LightSalmon",
+        "SteelBlue",
+        "Yellow",
+        "Fuchsia",
+        "PaleGreen",
+        "PaleTurquoise",
+        "Cornsilk",
+        "HotPink",
+        "Peru",
+        "Maroon"
+    };
+    const int numColors = sizeof( colors ) / sizeof( colors[0] );
+
+    QwtPlotCurve *curve = new Curve( counter++ );
+    curve->setPen( QColor( colors[ counter % numColors ] ), 2 );
+    curve->attach( this );
+}
+
+void Plot::applySettings( const Settings &settings )
+{
+    d_isDirty = false;
+    setAutoReplot( true );
+
+    if ( settings.legend.isEnabled )
+    {
+        if ( settings.legend.position > QwtPlot::TopLegend )
+        {
+            if ( legend() )
+            {
+                // remove legend controlled by the plot
+                insertLegend( NULL );
+            }
+
+            if ( d_externalLegend == NULL )
+            {
+                d_externalLegend = new QwtLegend();
+                d_externalLegend->setWindowTitle("Plot Legend");
+
+                connect( 
+                    this, 
+                    SIGNAL( legendDataChanged( const QVariant &, 
+                        const QList<QwtLegendData> & ) ),
+                    d_externalLegend, 
+                    SLOT( updateLegend( const QVariant &, 
+                        const QList<QwtLegendData> & ) ) );
+
+                d_externalLegend->show();
+
+                // populate the new legend
+                updateLegend();
+            }
+        }
+        else
+        {
+            delete d_externalLegend;
+            d_externalLegend = NULL;
+
+            if ( legend() == NULL || 
+                plotLayout()->legendPosition() != settings.legend.position )
+            {
+                insertLegend( new QwtLegend(), 
+                    QwtPlot::LegendPosition( settings.legend.position ) );
+            }
+        }
+    }
+    else
+    {
+        insertLegend( NULL );
+
+        delete d_externalLegend;
+        d_externalLegend = NULL;
+    }
+
+    if ( settings.legendItem.isEnabled )
+    {
+        if ( d_legendItem == NULL )
+        {
+            d_legendItem = new LegendItem();
+            d_legendItem->attach( this );
+        }
+
+        d_legendItem->setMaxColumns( settings.legendItem.numColumns );
+        d_legendItem->setAlignment( Qt::Alignment( settings.legendItem.alignment ) );
+        d_legendItem->setBackgroundMode(
+            QwtPlotLegendItem::BackgroundMode( settings.legendItem.backgroundMode ) );
+        if ( settings.legendItem.backgroundMode == 
+            QwtPlotLegendItem::ItemBackground )
+        {
+            d_legendItem->setBorderRadius( 4 );
+            d_legendItem->setMargin( 0 );
+            d_legendItem->setSpacing( 4 );
+            d_legendItem->setItemMargin( 2 );
+        }
+        else
+        {
+            d_legendItem->setBorderRadius( 8 );
+            d_legendItem->setMargin( 4 );
+            d_legendItem->setSpacing( 2 );
+            d_legendItem->setItemMargin( 0 );
+        }
+
+        QFont font = d_legendItem->font();
+        font.setPointSize( settings.legendItem.size );
+        d_legendItem->setFont( font );
+    }
+    else
+    {
+        delete d_legendItem;
+        d_legendItem = NULL;
+    }
+
+    QwtPlotItemList curveList = itemList( QwtPlotItem::Rtti_PlotCurve );
+    if ( curveList.size() != settings.curve.numCurves )
+    {
+        while ( curveList.size() > settings.curve.numCurves )
+        {
+            QwtPlotItem* curve = curveList.takeFirst();
+            delete curve;
+        }
+        
+        for ( int i = curveList.size(); i < settings.curve.numCurves; i++ )
+            insertCurve();
+    }
+
+    curveList = itemList( QwtPlotItem::Rtti_PlotCurve );
+    for ( int i = 0; i < curveList.count(); i++ )
+    {
+        Curve* curve = static_cast<Curve*>( curveList[i] );
+        curve->setCurveTitle( settings.curve.title );
+
+        int sz = 0.5 * settings.legendItem.size;
+        curve->setLegendIconSize( QSize( sz, sz ) );
+    }
+
+    setAutoReplot( false );
+    if ( d_isDirty )
+    {
+        d_isDirty = false;
+        replot();
+    }
+}
+
+void Plot::replot()
+{
+    if ( autoReplot() )
+    {
+        d_isDirty = true;
+        return;
+    }
+
+    QwtPlot::replot();
+}
+

examples/legends/plot.h

@@ -0,0 +1,32 @@
+#ifndef _PLOT_H_
+#define _PLOT_H_
+
+#include <qwt_plot.h>
+
+class Settings;
+class LegendItem;
+class QwtLegend;
+
+class Plot: public QwtPlot
+{
+    Q_OBJECT
+
+public:
+    Plot( QWidget *parent = NULL );
+    virtual ~Plot();
+
+public Q_SLOTS:
+    void applySettings( const Settings & );
+
+public:
+    virtual void replot();
+
+private:
+    void insertCurve();
+
+    QwtLegend *d_externalLegend;
+    LegendItem *d_legendItem;
+    bool d_isDirty;
+};
+
+#endif

examples/legends/settings.h

@@ -0,0 +1,47 @@
+#ifndef _SETTINGS_
+#define _SETTINGS_
+
+#include <qstring.h>
+
+class Settings
+{
+public:
+    Settings()
+    {
+        legend.isEnabled = false;
+        legend.position = 0;
+
+        legendItem.isEnabled = false;
+        legendItem.numColumns = 0;
+        legendItem.alignment = 0;
+        legendItem.backgroundMode = 0;
+        legendItem.size = 12;
+
+        curve.numCurves = 0;
+        curve.title = "Curve";
+    }
+    
+    struct
+    {
+        bool isEnabled;
+        int position;
+    } legend;
+
+    struct
+    {
+        bool isEnabled;
+        int numColumns;
+        int alignment;
+        int backgroundMode;
+        int size;
+        
+    } legendItem;
+    
+    struct
+    {
+        int numCurves;
+        QString title;
+    } curve;
+};
+
+#endif

examples/oscilloscope/curvedata.cpp

@@ -0,0 +1,27 @@
+#include "curvedata.h"
+#include "signaldata.h"
+
+const SignalData &CurveData::values() const
+{
+    return SignalData::instance();
+}
+
+SignalData &CurveData::values()
+{
+    return SignalData::instance();
+}
+
+QPointF CurveData::sample( size_t i ) const
+{
+    return SignalData::instance().value( i );
+}
+
+size_t CurveData::size() const
+{
+    return SignalData::instance().size();
+}
+
+QRectF CurveData::boundingRect() const
+{
+    return SignalData::instance().boundingRect();
+}

examples/oscilloscope/curvedata.h

@@ -0,0 +1,16 @@
+#include <qwt_series_data.h>
+#include <qpointer.h>
+
+class SignalData;
+
+class CurveData: public QwtSeriesData<QPointF>
+{
+public:
+    const SignalData &values() const;
+    SignalData &values();
+
+    virtual QPointF sample( size_t i ) const;
+    virtual size_t size() const;
+
+    virtual QRectF boundingRect() const;
+};

examples/oscilloscope/knob.cpp

@@ -0,0 +1,95 @@
+#include "knob.h"
+#include <qwt_math.h>
+#include <qpen.h>
+#include <qwt_knob.h>
+#include <qwt_round_scale_draw.h>
+#include <qwt_scale_engine.h>
+#include <qlabel.h>
+#include <qevent.h>
+
+Knob::Knob( const QString &title, double min, double max, QWidget *parent ):
+    QWidget( parent )
+{
+    QFont font( "Helvetica", 10 );
+
+    d_knob = new QwtKnob( this );
+    d_knob->setFont( font );
+
+    QwtScaleDiv scaleDiv =
+        d_knob->scaleEngine()->divideScale( min, max, 5, 3 );
+
+    QList<double> ticks = scaleDiv.ticks( QwtScaleDiv::MajorTick );
+    if ( ticks.size() > 0 && ticks[0] > min )
+    {
+        if ( ticks.first() > min )
+            ticks.prepend( min );
+        if ( ticks.last() < max )
+            ticks.append( max );
+    }
+    scaleDiv.setTicks( QwtScaleDiv::MajorTick, ticks );
+    d_knob->setScale( scaleDiv );
+
+    d_knob->setKnobWidth( 50 );
+
+    font.setBold( true );
+    d_label = new QLabel( title, this );
+    d_label->setFont( font );
+    d_label->setAlignment( Qt::AlignTop | Qt::AlignHCenter );
+
+    setSizePolicy( QSizePolicy::MinimumExpanding,
+        QSizePolicy::MinimumExpanding );
+
+    connect( d_knob, SIGNAL( valueChanged( double ) ),
+        this, SIGNAL( valueChanged( double ) ) );
+}
+
+QSize Knob::sizeHint() const
+{
+    QSize sz1 = d_knob->sizeHint();
+    QSize sz2 = d_label->sizeHint();
+
+    const int w = qMax( sz1.width(), sz2.width() );
+    const int h = sz1.height() + sz2.height();
+
+    int off = qCeil( d_knob->scaleDraw()->extent( d_knob->font() ) );
+    off -= 15; // spacing
+
+    return QSize( w, h - off );
+}
+
+void Knob::setValue( double value )
+{
+    d_knob->setValue( value );
+}
+
+double Knob::value() const
+{
+    return d_knob->value();
+}
+
+void Knob::setTheme( const QColor &color )
+{
+    d_knob->setPalette( color );
+}
+
+QColor Knob::theme() const
+{
+    return d_knob->palette().color( QPalette::Window );
+}
+
+void Knob::resizeEvent( QResizeEvent *event )
+{
+    const QSize sz = event->size();
+    const QSize hint = d_label->sizeHint();
+
+    d_label->setGeometry( 0, sz.height() - hint.height(),
+        sz.width(), hint.height() );
+
+    const int knobHeight = d_knob->sizeHint().height();
+
+    int off = qCeil( d_knob->scaleDraw()->extent( d_knob->font() ) );
+    off -= 15; // spacing
+
+    d_knob->setGeometry( 0, d_label->pos().y() - knobHeight + off,
+        sz.width(), knobHeight );
+}

examples/oscilloscope/knob.h

@@ -0,0 +1,38 @@
+#ifndef _KNOB_H_
+#define _KNOB_H_
+
+#include <qwidget.h>
+
+class QwtKnob;
+class QLabel;
+
+class Knob: public QWidget
+{
+    Q_OBJECT
+
+    Q_PROPERTY( QColor theme READ theme WRITE setTheme )
+
+public:
+    Knob( const QString &title,
+        double min, double max, QWidget *parent = NULL );
+
+    virtual QSize sizeHint() const;
+
+    void setValue( double value );
+    double value() const;
+
+    void setTheme( const QColor & );
+    QColor theme() const;
+
+Q_SIGNALS:
+    double valueChanged( double );
+
+protected:
+    virtual void resizeEvent( QResizeEvent * );
+
+private:
+    QwtKnob *d_knob;
+    QLabel *d_label;
+};
+
+#endif

examples/oscilloscope/main.cpp

@@ -0,0 +1,36 @@
+#include <qapplication.h>
+#include "mainwindow.h"
+#include "samplingthread.h"
+
+int main( int argc, char **argv )
+{
+    QApplication app( argc, argv );
+    app.setPalette( Qt::darkGray );
+
+    MainWindow window;
+    window.resize( 800, 400 );
+
+    SamplingThread samplingThread;
+    samplingThread.setFrequency( window.frequency() );
+    samplingThread.setAmplitude( window.amplitude() );
+    samplingThread.setInterval( window.signalInterval() );
+
+    window.connect( &window, SIGNAL( frequencyChanged( double ) ),
+        &samplingThread, SLOT( setFrequency( double ) ) );
+    window.connect( &window, SIGNAL( amplitudeChanged( double ) ),
+        &samplingThread, SLOT( setAmplitude( double ) ) );
+    window.connect( &window, SIGNAL( signalIntervalChanged( double ) ),
+        &samplingThread, SLOT( setInterval( double ) ) );
+
+    window.show();
+
+    samplingThread.start();
+    window.start();
+
+    bool ok = app.exec();
+
+    samplingThread.stop();
+    samplingThread.wait( 1000 );
+
+    return ok;
+}

examples/oscilloscope/mainwindow.cpp

@@ -0,0 +1,69 @@
+#include "mainwindow.h"
+#include "plot.h"
+#include "knob.h"
+#include "wheelbox.h"
+#include <qwt_scale_engine.h>
+#include <qlabel.h>
+#include <qlayout.h>
+
+MainWindow::MainWindow( QWidget *parent ):
+    QWidget( parent )
+{
+    const double intervalLength = 10.0; // seconds
+
+    d_plot = new Plot( this );
+    d_plot->setIntervalLength( intervalLength );
+
+    d_amplitudeKnob = new Knob( "Amplitude", 0.0, 200.0, this );
+    d_amplitudeKnob->setValue( 160.0 );
+
+    d_frequencyKnob = new Knob( "Frequency [Hz]", 0.1, 20.0, this );
+    d_frequencyKnob->setValue( 17.8 );
+
+    d_intervalWheel = new WheelBox( "Displayed [s]", 1.0, 100.0, 1.0, this );
+    d_intervalWheel->setValue( intervalLength );
+
+    d_timerWheel = new WheelBox( "Sample Interval [ms]", 0.0, 20.0, 0.1, this );
+    d_timerWheel->setValue( 10.0 );
+
+    QVBoxLayout* vLayout1 = new QVBoxLayout();
+    vLayout1->addWidget( d_intervalWheel );
+    vLayout1->addWidget( d_timerWheel );
+    vLayout1->addStretch( 10 );
+    vLayout1->addWidget( d_amplitudeKnob );
+    vLayout1->addWidget( d_frequencyKnob );
+
+    QHBoxLayout *layout = new QHBoxLayout( this );
+    layout->addWidget( d_plot, 10 );
+    layout->addLayout( vLayout1 );
+
+    connect( d_amplitudeKnob, SIGNAL( valueChanged( double ) ),
+        SIGNAL( amplitudeChanged( double ) ) );
+    connect( d_frequencyKnob, SIGNAL( valueChanged( double ) ),
+        SIGNAL( frequencyChanged( double ) ) );
+    connect( d_timerWheel, SIGNAL( valueChanged( double ) ),
+        SIGNAL( signalIntervalChanged( double ) ) );
+
+    connect( d_intervalWheel, SIGNAL( valueChanged( double ) ),
+        d_plot, SLOT( setIntervalLength( double ) ) );
+}
+
+void MainWindow::start()
+{
+    d_plot->start();
+}
+
+double MainWindow::frequency() const
+{
+    return d_frequencyKnob->value();
+}
+
+double MainWindow::amplitude() const
+{
+    return d_amplitudeKnob->value();
+}
+
+double MainWindow::signalInterval() const
+{
+    return d_timerWheel->value();
+}

examples/oscilloscope/mainwindow.h

@@ -0,0 +1,32 @@
+#include <qwidget.h>
+
+class Plot;
+class Knob;
+class WheelBox;
+
+class MainWindow : public QWidget
+{
+    Q_OBJECT
+
+public:
+    MainWindow( QWidget * = NULL );
+
+    void start();
+
+    double amplitude() const;
+    double frequency() const;
+    double signalInterval() const;
+
+Q_SIGNALS:
+    void amplitudeChanged( double );
+    void frequencyChanged( double );
+    void signalIntervalChanged( double );
+
+private:
+    Knob *d_frequencyKnob;
+    Knob *d_amplitudeKnob;
+    WheelBox *d_timerWheel;
+    WheelBox *d_intervalWheel;
+
+    Plot *d_plot;
+};