tvplot.cpp
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#include "tvplot.h"
#include <qwt_plot_layout.h>
#include <qwt_plot_canvas.h>
#include <qwt_plot_renderer.h>
#include <qwt_legend.h>
#include <qwt_legend_label.h>
#include <qwt_plot_grid.h>
#include <qwt_plot_histogram.h>
#include <qwt_column_symbol.h>
#include <qwt_series_data.h>
#include <qpen.h>
#include <stdlib.h>
class Histogram: public QwtPlotHistogram
{
public:
Histogram( const QString &, const QColor & );
void setColor( const QColor & );
void setValues( uint numValues, const double * );
};
Histogram::Histogram( const QString &title, const QColor &symbolColor ):
QwtPlotHistogram( title )
{
setStyle( QwtPlotHistogram::Columns );
setColor( symbolColor );
}
void Histogram::setColor( const QColor &color )
{
QColor c = color;
c.setAlpha( 180 );
setBrush( QBrush( c ) );
}
void Histogram::setValues( uint numValues, const double *values )
{
QVector<QwtIntervalSample> samples( numValues );
for ( uint i = 0; i < numValues; i++ )
{
QwtInterval interval( double( i ), i + 1.0 );
interval.setBorderFlags( QwtInterval::ExcludeMaximum );
samples[i] = QwtIntervalSample( values[i], interval );
}
setData( new QwtIntervalSeriesData( samples ) );
}
TVPlot::TVPlot( QWidget *parent ):
QwtPlot( parent )
{
setTitle( "Watching TV during a weekend" );
QwtPlotCanvas *canvas = new QwtPlotCanvas();
canvas->setPalette( Qt::gray );
canvas->setBorderRadius( 10 );
setCanvas( canvas );
plotLayout()->setAlignCanvasToScales( true );
setAxisTitle( QwtPlot::yLeft, "Number of People" );
setAxisTitle( QwtPlot::xBottom, "Number of Hours" );
QwtLegend *legend = new QwtLegend;
legend->setDefaultItemMode( QwtLegendData::Checkable );
insertLegend( legend, QwtPlot::RightLegend );
populate();
connect( legend, SIGNAL( checked( const QVariant &, bool, int ) ),
SLOT( showItem( const QVariant &, bool ) ) );
replot(); // creating the legend items
QwtPlotItemList items = itemList( QwtPlotItem::Rtti_PlotHistogram );
for ( int i = 0; i < items.size(); i++ )
{
if ( i == 0 )
{
const QVariant itemInfo = itemToInfo( items[i] );
QwtLegendLabel *legendLabel =
qobject_cast<QwtLegendLabel *>( legend->legendWidget( itemInfo ) );
if ( legendLabel )
legendLabel->setChecked( true );
items[i]->setVisible( true );
}
else
{
items[i]->setVisible( false );
}
}
setAutoReplot( true );
}
void TVPlot::populate()
{
QwtPlotGrid *grid = new QwtPlotGrid;
grid->enableX( false );
grid->enableY( true );
grid->enableXMin( false );
grid->enableYMin( false );
grid->setMajorPen( Qt::black, 0, Qt::DotLine );
grid->attach( this );
const double juneValues[] = { 7, 19, 24, 32, 10, 5, 3 };
const double novemberValues[] = { 4, 15, 22, 34, 13, 8, 4 };
Histogram *histogramJune = new Histogram( "Summer", Qt::red );
histogramJune->setValues(
sizeof( juneValues ) / sizeof( double ), juneValues );
histogramJune->attach( this );
Histogram *histogramNovember = new Histogram( "Winter", Qt::blue );
histogramNovember->setValues(
sizeof( novemberValues ) / sizeof( double ), novemberValues );
histogramNovember->attach( this );
}
void TVPlot::exportPlot()
{
QwtPlotRenderer renderer;
renderer.exportTo( this, "tvplot.pdf" );
}
void TVPlot::setMode( int mode )
{
QwtPlotItemList items = itemList( QwtPlotItem::Rtti_PlotHistogram );
for ( int i = 0; i < items.size(); i++ )
{
QwtPlotHistogram *histogram = static_cast<QwtPlotHistogram *>( items[i] );
if ( mode < 3 )
{
histogram->setStyle( static_cast<QwtPlotHistogram::HistogramStyle>( mode ) );
histogram->setSymbol( NULL );
QPen pen( Qt::black, 0 );
if ( mode == QwtPlotHistogram::Lines )
pen.setBrush( histogram->brush() );
histogram->setPen( pen );
}
else
{
histogram->setStyle( QwtPlotHistogram::Columns );
QwtColumnSymbol *symbol = new QwtColumnSymbol( QwtColumnSymbol::Box );
symbol->setFrameStyle( QwtColumnSymbol::Raised );
symbol->setLineWidth( 2 );
symbol->setPalette( QPalette( histogram->brush().color() ) );
histogram->setSymbol( symbol );
}
}
}
void TVPlot::showItem( const QVariant &itemInfo, bool on )
{
QwtPlotItem *plotItem = infoToItem( itemInfo );
if ( plotItem )
plotItem->setVisible( on );
}