Released version 6.1.3

examples/sinusplot/sinusplot.cpp

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+#include <qapplication.h>
+#include <qlayout.h>
+#include <qwt_plot.h>
+#include <qwt_plot_marker.h>
+#include <qwt_plot_curve.h>
+#include <qwt_legend.h>
+#include <qwt_point_data.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_panner.h>
+#include <qwt_plot_magnifier.h>
+#include <qwt_text.h>
+#include <qwt_symbol.h>
+#include <qwt_math.h>
+#include <math.h>
+
+//-----------------------------------------------------------------
+//              simple.cpp
+//
+//      A simple example which shows how to use QwtPlot connected
+//      to a data class without any storage, calculating each values
+//      on the fly.
+//-----------------------------------------------------------------
+
+class FunctionData: public QwtSyntheticPointData
+{
+public:
+    FunctionData( double( *y )( double ) ):
+        QwtSyntheticPointData( 100 ),
+        d_y( y )
+    {
+    }
+
+    virtual double y( double x ) const
+    {
+        return d_y( x );
+    }
+
+private:
+    double( *d_y )( double );
+};
+
+class ArrowSymbol: public QwtSymbol
+{
+public:
+    ArrowSymbol()
+    {
+        QPen pen( Qt::black, 0 );
+        pen.setJoinStyle( Qt::MiterJoin );
+
+        setPen( pen );
+        setBrush( Qt::red );
+
+        QPainterPath path;
+        path.moveTo( 0, 8 );
+        path.lineTo( 0, 5 );
+        path.lineTo( -3, 5 );
+        path.lineTo( 0, 0 );
+        path.lineTo( 3, 5 );
+        path.lineTo( 0, 5 );
+
+        QTransform transform;
+        transform.rotate( -30.0 );
+        path = transform.map( path );
+
+        setPath( path );
+        setPinPoint( QPointF( 0, 0 ) );
+
+        setSize( 10, 14 );
+    }
+};
+
+class Plot : public QwtPlot
+{
+public:
+    Plot( QWidget *parent = NULL );
+
+protected:
+    virtual void resizeEvent( QResizeEvent * );
+
+private:
+    void populate();
+    void updateGradient();
+};
+
+
+Plot::Plot( QWidget *parent ):
+    QwtPlot( parent )
+{
+    setAutoFillBackground( true );
+    setPalette( QPalette( QColor( 165, 193, 228 ) ) );
+    updateGradient();
+
+    setTitle( "A Simple QwtPlot Demonstration" );
+    insertLegend( new QwtLegend(), QwtPlot::RightLegend );
+
+    // axes
+    setAxisTitle( xBottom, "x -->" );
+    setAxisScale( xBottom, 0.0, 10.0 );
+
+    setAxisTitle( yLeft, "y -->" );
+    setAxisScale( yLeft, -1.0, 1.0 );
+
+    // canvas
+    QwtPlotCanvas *canvas = new QwtPlotCanvas();
+    canvas->setLineWidth( 1 );
+    canvas->setFrameStyle( QFrame::Box | QFrame::Plain );
+    canvas->setBorderRadius( 15 );
+
+    QPalette canvasPalette( Qt::white );
+    canvasPalette.setColor( QPalette::Foreground, QColor( 133, 190, 232 ) );
+    canvas->setPalette( canvasPalette );
+
+    setCanvas( canvas );
+
+    // panning with the left mouse button
+    ( void ) new QwtPlotPanner( canvas );
+
+    // zoom in/out with the wheel
+    ( void ) new QwtPlotMagnifier( canvas );
+
+    populate();
+}
+
+void Plot::populate()
+{
+    // Insert new curves
+    QwtPlotCurve *cSin = new QwtPlotCurve( "y = sin(x)" );
+    cSin->setRenderHint( QwtPlotItem::RenderAntialiased );
+    cSin->setLegendAttribute( QwtPlotCurve::LegendShowLine, true );
+    cSin->setPen( Qt::red );
+    cSin->attach( this );
+
+    QwtPlotCurve *cCos = new QwtPlotCurve( "y = cos(x)" );
+    cCos->setRenderHint( QwtPlotItem::RenderAntialiased );
+    cCos->setLegendAttribute( QwtPlotCurve::LegendShowLine, true );
+    cCos->setPen( Qt::blue );
+    cCos->attach( this );
+
+    // Create sin and cos data
+    cSin->setData( new FunctionData( ::sin ) );
+    cCos->setData( new FunctionData( ::cos ) );
+
+    // Insert markers
+
+    //  ...a horizontal line at y = 0...
+    QwtPlotMarker *mY = new QwtPlotMarker();
+    mY->setLabel( QString::fromLatin1( "y = 0" ) );
+    mY->setLabelAlignment( Qt::AlignRight | Qt::AlignTop );
+    mY->setLineStyle( QwtPlotMarker::HLine );
+    mY->setYValue( 0.0 );
+    mY->attach( this );
+
+    //  ...a vertical line at x = 2 * pi
+    QwtPlotMarker *mX = new QwtPlotMarker();
+    mX->setLabel( QString::fromLatin1( "x = 2 pi" ) );
+    mX->setLabelAlignment( Qt::AlignLeft | Qt::AlignBottom );
+    mX->setLabelOrientation( Qt::Vertical );
+    mX->setLineStyle( QwtPlotMarker::VLine );
+    mX->setLinePen( Qt::black, 0, Qt::DashDotLine );
+    mX->setXValue( 2.0 * M_PI );
+    mX->attach( this );
+
+    const double x = 7.7;
+
+    // an arrow at a specific position
+    QwtPlotMarker *mPos = new QwtPlotMarker( "Marker" );
+    mPos->setRenderHint( QwtPlotItem::RenderAntialiased, true );
+    mPos->setItemAttribute( QwtPlotItem::Legend, true );
+    mPos->setSymbol( new ArrowSymbol() );
+    mPos->setValue( QPointF( x, ::sin( x ) ) );
+    mPos->setLabel( QString( "x = %1" ).arg( x ) );
+    mPos->setLabelAlignment( Qt::AlignRight | Qt::AlignBottom );
+    mPos->attach( this );
+}
+
+void Plot::updateGradient()
+{
+    QPalette pal = palette();
+
+    const QColor buttonColor = pal.color( QPalette::Button );
+
+    QLinearGradient gradient( rect().topLeft(), rect().bottomLeft() );
+    gradient.setColorAt( 0.0, Qt::white );
+    gradient.setColorAt( 0.7, buttonColor );
+    gradient.setColorAt( 1.0, buttonColor );
+
+    pal.setBrush( QPalette::Window, gradient );
+    setPalette( pal );
+}
+
+void Plot::resizeEvent( QResizeEvent *event )
+{
+    QwtPlot::resizeEvent( event );
+
+    // Qt 4.7.1: QGradient::StretchToDeviceMode is buggy on X11
+    updateGradient();
+}
+
+int main( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    Plot *plot = new Plot();
+
+    // We put a dummy widget around to have
+    // so that Qt paints a widget background
+    // when resizing
+
+    QWidget window;
+    QHBoxLayout *layout = new QHBoxLayout( &window );
+    layout->setContentsMargins( 0, 0, 0, 0 );
+    layout->addWidget( plot );
+
+    window.resize( 600, 400 );
+    window.show();
+
+    return a.exec();
+}

examples/sinusplot/sinusplot.pro

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+################################################################
+# 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       = sinusplot
+
+SOURCES = \
+    sinusplot.cpp
+