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examples/barchart/BarChart.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "BarChart.h"
+
+#include <QwtPlotRenderer>
+#include <QwtPlotMultiBarChart>
+#include <QwtColumnSymbol>
+#include <QwtPlotLayout>
+#include <QwtLegend>
+#include <QwtScaleDraw>
+#include <QwtText>
+#include <QwtMath>
+
+BarChart::BarChart( QWidget* parent )
+    : QwtPlot( parent )
+{
+    setAutoFillBackground( true );
+
+    setPalette( Qt::white );
+    canvas()->setPalette( QColor( "LemonChiffon" ) );
+
+    setTitle( "Bar Chart" );
+
+    setAxisTitle( QwtAxis::YLeft, "Whatever" );
+    setAxisTitle( QwtAxis::XBottom, "Whatever" );
+
+    m_barChartItem = new QwtPlotMultiBarChart( "Bar Chart " );
+    m_barChartItem->setLayoutPolicy( QwtPlotMultiBarChart::AutoAdjustSamples );
+    m_barChartItem->setSpacing( 20 );
+    m_barChartItem->setMargin( 3 );
+
+    m_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 );
+    }
+    m_barChartItem->setBarTitles( titles );
+    m_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] ) );
+
+        m_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 + qwtRand() % 8 );
+
+        series += values;
+    }
+
+    m_barChartItem->setSamples( series );
+}
+
+void BarChart::setMode( int mode )
+{
+    if ( mode == 0 )
+    {
+        m_barChartItem->setStyle( QwtPlotMultiBarChart::Grouped );
+    }
+    else
+    {
+        m_barChartItem->setStyle( QwtPlotMultiBarChart::Stacked );
+    }
+}
+
+void BarChart::setOrientation( int orientation )
+{
+    int axis1, axis2;
+
+    if ( orientation == 0 )
+    {
+        axis1 = QwtAxis::XBottom;
+        axis2 = QwtAxis::YLeft;
+
+        m_barChartItem->setOrientation( Qt::Vertical );
+    }
+    else
+    {
+        axis1 = QwtAxis::YLeft;
+        axis2 = QwtAxis::XBottom;
+
+        m_barChartItem->setOrientation( Qt::Horizontal );
+    }
+
+    setAxisScale( axis1, 0, m_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" );
+}
+
+#include "moc_BarChart.cpp"

examples/barchart/BarChart.h

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#pragma once
+
+#include <QwtPlot>
+
+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* m_barChartItem;
+};

examples/barchart/barchart.pro

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+######################################################################
+# Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+# This file may be used under the terms of the 3-clause BSD License
+######################################################################
+
+include( $${PWD}/../examples.pri )
+
+TARGET   = barchart
+
+SOURCES = \
+    BarChart.cpp \
+    main.cpp
+
+HEADERS = \
+    BarChart.h

examples/barchart/main.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "BarChart.h"
+
+#include <QApplication>
+#include <QMainWindow>
+#include <QToolBar>
+#include <QToolButton>
+#include <QComboBox>
+
+namespace
+{
+    class MainWindow : public QMainWindow
+    {
+      public:
+        MainWindow( QWidget* = NULL );
+    };
+}
+
+MainWindow::MainWindow( QWidget* parent )
+    : QMainWindow( parent )
+{
+    BarChart* chart = new BarChart();
+    setCentralWidget( chart );
+
+    QToolBar* toolBar = new QToolBar();
+
+    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()), chart, SLOT(exportChart()) );
+
+    toolBar->addWidget( typeBox );
+    toolBar->addWidget( orientationBox );
+    toolBar->addWidget( btnExport );
+    addToolBar( toolBar );
+
+    chart->setMode( typeBox->currentIndex() );
+    connect( typeBox, SIGNAL(currentIndexChanged(int)),
+        chart, SLOT(setMode(int)) );
+
+    chart->setOrientation( orientationBox->currentIndex() );
+    connect( orientationBox, SIGNAL(currentIndexChanged(int)),
+        chart, SLOT(setOrientation(int)) );
+}
+
+int main( int argc, char* argv[] )
+{
+    QApplication app( argc, argv );
+
+    MainWindow window;
+
+    window.resize( 600, 400 );
+    window.show();
+
+    return app.exec();
+}