彻底改版2.0

third/qwtdemo/examples/barchart/barchart.cpp

@@ -0,0 +1,132 @@
+#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" );
+}