Released version 6.1.3

examples/barchart/barchart.cpp

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+#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

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+#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

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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   = barchart
+
+SOURCES = \
+    barchart.cpp \
+    main.cpp
+
+HEADERS = \
+    barchart.h

examples/barchart/main.cpp

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+#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();
+}