barchart.cpp
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#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" );
}