彻底改版2.0

third/qwtdemo/examples/distrowatch/barchart.cpp

@@ -0,0 +1,196 @@
+#include "barchart.h"
+#include <qwt_plot_renderer.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_barchart.h>
+#include <qwt_column_symbol.h>
+#include <qwt_plot_layout.h>
+#include <qwt_legend.h>
+#include <qwt_scale_draw.h>
+
+class DistroScaleDraw: public QwtScaleDraw
+{
+public:
+    DistroScaleDraw( Qt::Orientation orientation, const QStringList &labels ):
+        d_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
+    {
+        QwtText lbl;
+
+        const int index = qRound( value );
+        if ( index >= 0 && index < d_labels.size() )
+        {
+            lbl = d_labels[ index ];
+        }
+            
+        return lbl;
+    }
+
+private:
+    const QStringList d_labels;
+};
+
+class DistroChartItem: public QwtPlotBarChart
+{
+public:
+    DistroChartItem():
+        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 )
+    {
+        d_colors += color;
+        d_distros += distro;
+        itemChanged();
+    }
+
+    virtual QwtColumnSymbol *specialSymbol(
+        int index, const QPointF& ) const
+    {
+        // 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 < d_colors.size() )
+            c = d_colors[ index ];
+
+        symbol->setPalette( c );
+    
+        return symbol;
+    }
+
+    virtual QwtText barTitle( int sampleIndex ) const
+    {
+        QwtText title;
+        if ( sampleIndex >= 0 && sampleIndex < d_distros.size() )
+            title = d_distros[ sampleIndex ];
+
+        return title;
+    }
+
+private:
+    QList<QColor> d_colors;
+    QList<QString> d_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::Foreground, QColor( "Indigo" ) );
+    canvas->setPalette( canvasPalette );
+
+    setCanvas( canvas );
+
+    setTitle( "DistroWatch Page Hit Ranking, April 2012" );
+
+    d_barChartItem = new DistroChartItem();
+
+    QVector< double > samples;
+
+    for ( uint i = 0; i < sizeof( pageHits ) / sizeof( pageHits[ 0 ] ); i++ )
+    {
+        d_distros += pageHits[ i ].distro;
+        samples += pageHits[ i ].hits;
+
+        d_barChartItem->addDistro( 
+            pageHits[ i ].distro, pageHits[ i ].color );
+    }
+
+    d_barChartItem->setSamples( samples );
+
+    d_barChartItem->attach( this );
+
+    insertLegend( new QwtLegend() );
+
+    setOrientation( 0 );
+    setAutoReplot( false );
+}
+
+void BarChart::setOrientation( int o )
+{
+    const Qt::Orientation orientation =
+        ( o == 0 ) ? Qt::Vertical : Qt::Horizontal;
+
+    int axis1 = QwtPlot::xBottom;
+    int axis2 = QwtPlot::yLeft;
+
+    if ( orientation == Qt::Horizontal )
+        qSwap( axis1, axis2 );
+
+    d_barChartItem->setOrientation( orientation );
+
+    setAxisTitle( axis1, "Distros" );
+    setAxisMaxMinor( axis1, 3 );
+    setAxisScaleDraw( axis1, new DistroScaleDraw( orientation, d_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" );
+}