133 lines
3.3 KiB
C++
133 lines
3.3 KiB
C++
#include "barchart.h"
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#include <qwt_plot_renderer.h>
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#include <qwt_plot_canvas.h>
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#include <qwt_plot_multi_barchart.h>
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#include <qwt_column_symbol.h>
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#include <qwt_plot_layout.h>
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#include <qwt_legend.h>
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#include <qwt_scale_draw.h>
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BarChart::BarChart( QWidget *parent ):
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QwtPlot( parent )
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{
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setAutoFillBackground( true );
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setPalette( Qt::white );
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canvas()->setPalette( QColor( "LemonChiffon" ) );
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setTitle( "Bar Chart" );
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setAxisTitle( QwtPlot::yLeft, "Whatever" );
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setAxisTitle( QwtPlot::xBottom, "Whatever" );
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d_barChartItem = new QwtPlotMultiBarChart( "Bar Chart " );
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d_barChartItem->setLayoutPolicy( QwtPlotMultiBarChart::AutoAdjustSamples );
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d_barChartItem->setSpacing( 20 );
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d_barChartItem->setMargin( 3 );
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d_barChartItem->attach( this );
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insertLegend( new QwtLegend() );
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populate();
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setOrientation( 0 );
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setAutoReplot( true );
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}
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void BarChart::populate()
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{
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static const char *colors[] = { "DarkOrchid", "SteelBlue", "Gold" };
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const int numSamples = 5;
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const int numBars = sizeof( colors ) / sizeof( colors[0] );
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QList<QwtText> titles;
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for ( int i = 0; i < numBars; i++ )
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{
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QString title("Bar %1");
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titles += title.arg( i );
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}
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d_barChartItem->setBarTitles( titles );
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d_barChartItem->setLegendIconSize( QSize( 10, 14 ) );
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for ( int i = 0; i < numBars; i++ )
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{
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QwtColumnSymbol *symbol = new QwtColumnSymbol( QwtColumnSymbol::Box );
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symbol->setLineWidth( 2 );
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symbol->setFrameStyle( QwtColumnSymbol::Raised );
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symbol->setPalette( QPalette( colors[i] ) );
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d_barChartItem->setSymbol( i, symbol );
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}
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QVector< QVector<double> > series;
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for ( int i = 0; i < numSamples; i++ )
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{
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QVector<double> values;
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for ( int j = 0; j < numBars; j++ )
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values += ( 2 + qrand() % 8 );
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series += values;
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}
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d_barChartItem->setSamples( series );
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}
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void BarChart::setMode( int mode )
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{
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if ( mode == 0 )
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{
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d_barChartItem->setStyle( QwtPlotMultiBarChart::Grouped );
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}
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else
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{
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d_barChartItem->setStyle( QwtPlotMultiBarChart::Stacked );
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}
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}
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void BarChart::setOrientation( int orientation )
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{
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QwtPlot::Axis axis1, axis2;
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if ( orientation == 0 )
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{
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axis1 = QwtPlot::xBottom;
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axis2 = QwtPlot::yLeft;
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d_barChartItem->setOrientation( Qt::Vertical );
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}
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else
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{
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axis1 = QwtPlot::yLeft;
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axis2 = QwtPlot::xBottom;
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d_barChartItem->setOrientation( Qt::Horizontal );
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}
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setAxisScale( axis1, 0, d_barChartItem->dataSize() - 1, 1.0 );
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setAxisAutoScale( axis2 );
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QwtScaleDraw *scaleDraw1 = axisScaleDraw( axis1 );
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scaleDraw1->enableComponent( QwtScaleDraw::Backbone, false );
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scaleDraw1->enableComponent( QwtScaleDraw::Ticks, false );
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QwtScaleDraw *scaleDraw2 = axisScaleDraw( axis2 );
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scaleDraw2->enableComponent( QwtScaleDraw::Backbone, true );
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scaleDraw2->enableComponent( QwtScaleDraw::Ticks, true );
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plotLayout()->setAlignCanvasToScale( axis1, true );
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plotLayout()->setAlignCanvasToScale( axis2, false );
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plotLayout()->setCanvasMargin( 0 );
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updateCanvasMargins();
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replot();
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}
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void BarChart::exportChart()
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{
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QwtPlotRenderer renderer;
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renderer.exportTo( this, "barchart.pdf" );
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}
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