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examples/distrowatch/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 <QwtPlotCanvas>
+#include <QwtPlotBarChart>
+#include <QwtColumnSymbol>
+#include <QwtPlotLayout>
+#include <QwtLegend>
+#include <QwtScaleDraw>
+#include <QwtText>
+
+#include <QApplication>
+#include <QPainter>
+
+namespace
+{
+    class ScaleDraw : public QwtScaleDraw
+    {
+      public:
+        ScaleDraw( Qt::Orientation orientation, const QStringList& labels )
+            : m_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 QWT_OVERRIDE
+        {
+            QwtText lbl;
+
+            const int index = qRound( value );
+            if ( index >= 0 && index < m_labels.size() )
+            {
+                lbl = m_labels[ index ];
+            }
+
+            return lbl;
+        }
+
+      private:
+        const QStringList m_labels;
+    };
+
+    class ChartItem : public QwtPlotBarChart
+    {
+      public:
+        ChartItem()
+            : 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 )
+        {
+            m_colors += color;
+            m_distros += distro;
+            itemChanged();
+        }
+
+        virtual QwtColumnSymbol* specialSymbol(
+            int index, const QPointF& ) const QWT_OVERRIDE
+        {
+            // 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 < m_colors.size() )
+                c = m_colors[ index ];
+
+            symbol->setPalette( c );
+
+            return symbol;
+        }
+
+        virtual QwtText barTitle( int sampleIndex ) const QWT_OVERRIDE
+        {
+            QwtText title;
+            if ( sampleIndex >= 0 && sampleIndex < m_distros.size() )
+                title = m_distros[ sampleIndex ];
+
+            return title;
+        }
+
+      private:
+        QList< QColor > m_colors;
+        QList< QString > m_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::WindowText, QColor( "Indigo" ) );
+    canvas->setPalette( canvasPalette );
+
+    setCanvas( canvas );
+
+    setTitle( "DistroWatch Page Hit Ranking, April 2012" );
+
+    ChartItem* chartItem = new ChartItem();
+
+    QVector< double > samples;
+
+    for ( uint i = 0; i < sizeof( pageHits ) / sizeof( pageHits[ 0 ] ); i++ )
+    {
+        m_distros += pageHits[ i ].distro;
+        samples += pageHits[ i ].hits;
+
+        chartItem->addDistro( pageHits[ i ].distro, pageHits[ i ].color );
+    }
+
+    chartItem->setSamples( samples );
+    chartItem->attach( this );
+
+    m_chartItem = chartItem;
+
+    insertLegend( new QwtLegend() );
+
+    setOrientation( 0 );
+    setAutoReplot( false );
+}
+
+void BarChart::setOrientation( int o )
+{
+    const Qt::Orientation orientation =
+        ( o == 0 ) ? Qt::Vertical : Qt::Horizontal;
+
+    int axis1 = QwtAxis::XBottom;
+    int axis2 = QwtAxis::YLeft;
+
+    if ( orientation == Qt::Horizontal )
+        qSwap( axis1, axis2 );
+
+    m_chartItem->setOrientation( orientation );
+
+    setAxisTitle( axis1, "Distros" );
+    setAxisMaxMinor( axis1, 3 );
+    setAxisScaleDraw( axis1, new ScaleDraw( orientation, m_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" );
+}
+
+void BarChart::doScreenShot()
+{
+    exportPNG( 800, 600 );
+}
+
+void BarChart::exportPNG( int width, int height )
+{
+    const QString fileBase = QString("distrowatch-%2x%3" ).arg( width ).arg( height);
+
+    const int resolution = qRound( 85.0 * width / 800.0 );
+
+    const double mmToInch = 1.0 / 25.4;
+    const int dotsPerMeter = qRound( resolution * mmToInch * 1000.0 );
+
+    QImage image( width, height, QImage::Format_ARGB32 );
+    image.setDotsPerMeterX( dotsPerMeter );
+    image.setDotsPerMeterY( dotsPerMeter );
+
+    image.fill( Qt::transparent );
+
+    QPainter painter( &image );
+    render( &painter, QRectF( 0, 0, width, height ) );
+    painter.end();
+
+    image.save( fileBase + ".png" );
+}
+
+void BarChart::render( QPainter* painter, const QRectF& targetRect )
+{
+    const int r = 20;
+    const QRectF plotRect = targetRect.adjusted( 0.5 * r, 0.5 * r, -0.5 * r, -0.5 * r );
+
+    QwtPlotRenderer renderer;
+
+    if ( qApp->styleSheet().isEmpty() )
+    {
+        renderer.setDiscardFlag( QwtPlotRenderer::DiscardBackground, true );
+
+        painter->save();
+        painter->setRenderHint( QPainter::Antialiasing, true );
+        painter->setPen( QPen( Qt::darkGray, 1 ) );
+        painter->setBrush( QColor( "WhiteSmoke" ) );
+        painter->drawRoundedRect( targetRect, r, r );
+        painter->restore();
+    }
+
+    renderer.render( this, painter, plotRect );
+}
+
+#include "moc_BarChart.cpp"

examples/distrowatch/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>
+#include <QStringList>
+
+class QwtPlotBarChart;
+
+class BarChart : public QwtPlot
+{
+    Q_OBJECT
+
+  public:
+    BarChart( QWidget* = NULL );
+
+  public Q_SLOTS:
+    void setOrientation( int );
+    void exportChart();
+    void doScreenShot();
+
+  private:
+    void populate();
+    void exportPNG( int width, int height );
+    void render( QPainter* painter, const QRectF& targetRect );
+
+    QwtPlotBarChart* m_chartItem;
+    QStringList m_distros;
+};

examples/distrowatch/distrowatch.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       = distrowatch
+
+HEADERS = \
+    BarChart.h 
+
+SOURCES = \
+    BarChart.cpp \
+    main.cpp

examples/distrowatch/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( this );
+    setCentralWidget( 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()), chart, SLOT(exportChart()) );
+
+    QToolButton* btnScreenshot = new QToolButton( toolBar );
+    btnScreenshot->setText( "Screenshot" );
+    btnScreenshot->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+    connect( btnScreenshot, SIGNAL(clicked()), chart, SLOT(doScreenShot()) );
+
+    toolBar->addWidget( orientationBox );
+    toolBar->addWidget( btnExport );
+    toolBar->addWidget( btnScreenshot );
+    addToolBar( toolBar );
+
+    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();
+}