Released version 6.1.3

playground/timescale/main.cpp

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+#include <qapplication.h>
+#include "mainwindow.h"
+
+int main( int argc, char **argv )
+{
+    QApplication a( argc, argv );
+
+    MainWindow window;
+    window.resize( 800, 600 );
+    window.show();
+
+    return a.exec();
+}

playground/timescale/mainwindow.cpp

@@ -0,0 +1,58 @@
+#include "plot.h"
+#include "panel.h"
+#include "mainwindow.h"
+#include <qwt_date.h>
+#include <qwt_scale_widget.h>
+#include <qlayout.h>
+
+MainWindow::MainWindow( QWidget *parent ):
+    QMainWindow( parent )
+{
+    Settings settings;
+#if 1
+    settings.startDateTime = QDateTime( QDate( 2012, 10, 27 ), QTime( 18, 5, 0, 0 ) );
+    settings.endDateTime = QDateTime( QDate( 2012, 10, 28 ), QTime( 12, 12, 0, 0 ) );
+#else
+    settings.startDateTime = QDateTime( QDate( 2011, 5, 3 ), QTime( 0, 6, 0, 0 ) );
+    settings.endDateTime = QDateTime( QDate( 2012, 3, 10 ), QTime( 0, 5, 0, 0 ) );
+#endif
+    settings.maxMajorSteps = 10;
+    settings.maxMinorSteps = 8;
+    settings.maxWeeks = -1;
+
+    d_plot = new Plot();
+    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 );
+
+    updatePlot();
+
+    connect( d_panel, SIGNAL( edited() ), SLOT( updatePlot() ) );
+    connect( d_plot->axisWidget( QwtPlot::yLeft ), 
+        SIGNAL( scaleDivChanged() ), SLOT( updatePanel() ) );
+}
+
+void MainWindow::updatePlot()
+{
+    d_plot->blockSignals( true );
+    d_plot->applySettings( d_panel->settings() );
+    d_plot->blockSignals( false );
+}
+
+void MainWindow::updatePanel()
+{
+    const QwtScaleDiv scaleDiv = d_plot->axisScaleDiv( QwtPlot::yLeft );
+
+    Settings settings = d_panel->settings();
+    settings.startDateTime = QwtDate::toDateTime( scaleDiv.lowerBound(), Qt::LocalTime );
+    settings.endDateTime = QwtDate::toDateTime( scaleDiv.upperBound(), Qt::LocalTime );
+
+    d_panel->setSettings( settings );
+}

playground/timescale/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 updatePanel();
+
+private:
+    Plot *d_plot;
+    Panel *d_panel;
+};

playground/timescale/panel.cpp

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+#include "panel.h"
+#include "settings.h"
+#include <qwt_date.h>
+#include <qdatetimeedit.h>
+#include <qspinbox.h>
+#include <qlayout.h>
+#include <qlabel.h>
+
+Panel::Panel( QWidget *parent ):
+    QWidget( parent )
+{
+    // create widgets
+
+    d_startDateTime = new QDateTimeEdit();
+    d_startDateTime->setDisplayFormat( "M/d/yyyy h:mm AP :zzz" );
+    d_startDateTime->setCalendarPopup( true );
+
+    d_endDateTime = new QDateTimeEdit();
+    d_endDateTime->setDisplayFormat( "M/d/yyyy h:mm AP :zzz" );
+    d_endDateTime->setCalendarPopup( true );
+    
+    d_maxMajorSteps = new QSpinBox();
+    d_maxMajorSteps->setRange( 0, 50 );
+
+    d_maxMinorSteps = new QSpinBox();
+    d_maxMinorSteps->setRange( 0, 50 );
+
+    d_maxWeeks = new QSpinBox();
+    d_maxWeeks->setRange( -1, 100 );
+    d_maxWeeks->setSpecialValueText( "Disabled" );
+
+    // layout
+
+    QGridLayout *layout = new QGridLayout( this );
+    layout->setAlignment( Qt::AlignLeft | Qt::AlignTop );
+
+    int row = 0;
+    layout->addWidget( new QLabel( "From" ), row, 0 );
+    layout->addWidget( d_startDateTime, row, 1 );
+
+    row++;
+    layout->addWidget( new QLabel( "To" ), row, 0 );
+    layout->addWidget( d_endDateTime, row, 1 );
+
+    row++;
+    layout->addWidget( new QLabel( "Max. Major Steps" ), row, 0 );
+    layout->addWidget( d_maxMajorSteps, row, 1 );
+
+    row++;
+    layout->addWidget( new QLabel( "Max. Minor Steps" ), row, 0 );
+    layout->addWidget( d_maxMinorSteps, row, 1 );
+
+    row++;
+    layout->addWidget( new QLabel( "Max Weeks" ), row, 0 );
+    layout->addWidget( d_maxWeeks, row, 1 );
+
+    connect( d_startDateTime,
+        SIGNAL( dateTimeChanged( const QDateTime & ) ), SIGNAL( edited() ) );
+    connect( d_endDateTime,
+        SIGNAL( dateTimeChanged( const QDateTime & ) ), SIGNAL( edited() ) );
+    connect( d_maxMajorSteps,
+        SIGNAL( valueChanged( int ) ), SIGNAL( edited() ) );
+    connect( d_maxMinorSteps,
+        SIGNAL( valueChanged( int ) ), SIGNAL( edited() ) );
+    connect( d_maxWeeks,
+        SIGNAL( valueChanged( int ) ), SIGNAL( edited() ) );
+}
+
+void Panel::setSettings( const Settings &settings )
+{
+    blockSignals( true );
+
+    d_startDateTime->setDateTime( settings.startDateTime );
+    d_endDateTime->setDateTime( settings.endDateTime );
+
+    d_maxMajorSteps->setValue( settings.maxMajorSteps );
+    d_maxMinorSteps->setValue( settings.maxMinorSteps );
+    d_maxWeeks->setValue( settings.maxWeeks );
+        
+    blockSignals( false );
+}
+
+Settings Panel::settings() const
+{
+    Settings settings;
+
+    settings.startDateTime = d_startDateTime->dateTime();
+    settings.endDateTime = d_endDateTime->dateTime();
+
+    settings.maxMajorSteps = d_maxMajorSteps->value();
+    settings.maxMinorSteps = d_maxMinorSteps->value();
+    settings.maxWeeks = d_maxWeeks->value();
+
+    return settings;
+}

playground/timescale/panel.h

@@ -0,0 +1,32 @@
+#ifndef _PANEL_
+#define _PANEL_
+
+#include "settings.h"
+#include <qwidget.h>
+
+class QDateTimeEdit;
+class QSpinBox;
+
+class Panel: public QWidget
+{
+    Q_OBJECT
+
+public:
+    Panel( QWidget *parent = NULL );
+
+    void setSettings( const Settings &);
+    Settings settings() const;
+    
+Q_SIGNALS:
+    void edited();
+
+private:
+    QDateTimeEdit* d_startDateTime;
+    QDateTimeEdit* d_endDateTime;
+
+    QSpinBox *d_maxMajorSteps;
+    QSpinBox *d_maxMinorSteps;
+    QSpinBox *d_maxWeeks;
+};
+
+#endif

playground/timescale/plot.cpp

@@ -0,0 +1,90 @@
+#include "plot.h"
+#include "settings.h"
+#include <qwt_date.h>
+#include <qwt_date_scale_draw.h>
+#include <qwt_date_scale_engine.h>
+#include <qwt_plot_panner.h>
+#include <qwt_plot_magnifier.h>
+#include <qwt_plot_grid.h>
+#include <qwt_plot_layout.h>
+
+Plot::Plot( QWidget *parent ):
+    QwtPlot( parent )
+{
+    setAutoFillBackground( true );
+    setPalette( Qt::darkGray );
+    setCanvasBackground( Qt::white );
+
+    plotLayout()->setAlignCanvasToScales( true );
+
+    initAxis( QwtPlot::yLeft, "Local Time", Qt::LocalTime );
+    initAxis( QwtPlot::yRight, 
+        "Coordinated Universal Time ( UTC )", Qt::UTC );
+
+    QwtPlotPanner *panner = new QwtPlotPanner( canvas() );
+    QwtPlotMagnifier *magnifier = new QwtPlotMagnifier( canvas() );
+
+    for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
+    {
+        const bool on = axis == QwtPlot::yLeft ||
+            axis == QwtPlot::yRight;
+
+        enableAxis( axis, on );
+        panner->setAxisEnabled( axis, on );
+        magnifier->setAxisEnabled( axis, on );
+    }
+
+    QwtPlotGrid *grid = new QwtPlotGrid();
+    grid->setMajorPen( Qt::black, 0, Qt::SolidLine );
+    grid->setMinorPen( Qt::gray, 0 , Qt::SolidLine );
+    grid->enableX( false );
+    grid->enableXMin( false );
+    grid->enableY( true );
+    grid->enableYMin( true );
+
+    grid->attach( this );
+}
+
+void Plot::initAxis( int axis, 
+    const QString& title, Qt::TimeSpec timeSpec )
+{
+    setAxisTitle( axis, title );
+
+    QwtDateScaleDraw *scaleDraw = new QwtDateScaleDraw( timeSpec );
+    QwtDateScaleEngine *scaleEngine = new QwtDateScaleEngine( timeSpec );
+
+#if 0
+    if ( timeSpec == Qt::LocalTime )
+    {
+        scaleDraw->setTimeSpec( Qt::OffsetFromUTC );
+        scaleDraw->setUtcOffset( 10 );
+
+        scaleEngine->setTimeSpec( Qt::OffsetFromUTC );
+        scaleEngine->setUtcOffset( 10 );
+    }
+#endif
+    setAxisScaleDraw( axis, scaleDraw );
+    setAxisScaleEngine( axis, scaleEngine );
+}
+
+void Plot::applySettings( const Settings &settings )
+{
+    applyAxisSettings( QwtPlot::yLeft, settings );
+    applyAxisSettings( QwtPlot::yRight, settings );
+
+    replot();
+}
+
+void Plot::applyAxisSettings( int axis, const Settings &settings )
+{
+    QwtDateScaleEngine *scaleEngine = 
+        static_cast<QwtDateScaleEngine *>( axisScaleEngine( axis ) );
+
+    scaleEngine->setMaxWeeks( settings.maxWeeks );
+    setAxisMaxMinor( axis, settings.maxMinorSteps );
+    setAxisMaxMajor( axis, settings.maxMajorSteps );
+
+
+    setAxisScale( axis, QwtDate::toDouble( settings.startDateTime ), 
+        QwtDate::toDouble( settings.endDateTime ) );
+}

playground/timescale/plot.h

@@ -0,0 +1,23 @@
+#ifndef _PLOT_H_
+#define _PLOT_H_
+
+#include <qwt_plot.h>
+
+class Settings;
+
+class Plot: public QwtPlot
+{
+    Q_OBJECT 
+
+public:
+    Plot( QWidget *parent = NULL );
+
+public Q_SLOTS:
+    void applySettings( const Settings & );
+
+private:
+    void initAxis( int axis, const QString& title, Qt::TimeSpec );
+    void applyAxisSettings( int axis, const Settings & );
+};
+
+#endif

playground/timescale/settings.h

@@ -0,0 +1,25 @@
+#ifndef _SETTINGS_H_
+#define _SETTINGS_H_ 1
+
+#include <qdatetime.h>
+
+class Settings
+{
+public:
+    Settings():
+        maxMajorSteps( 10 ),
+        maxMinorSteps( 5 ),
+        maxWeeks( -1 )
+    {
+    };
+
+    QDateTime startDateTime;
+    QDateTime endDateTime;
+
+    int maxMajorSteps;
+    int maxMinorSteps;
+
+    int maxWeeks;
+};
+
+#endif

playground/timescale/timescale.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}/../playground.pri )
+
+TARGET       = timescale
+
+HEADERS = \
+    panel.h \
+    plot.h \
+    mainwindow.h
+
+SOURCES = \
+    panel.cpp \
+    plot.cpp \
+    mainwindow.cpp \
+    main.cpp
+