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#include <qwt_plot.h>
#include <qwt_plot_canvas.h>
#include <qwt_plot_curve.h>
#include <qwt_symbol.h>
#include <qwt_plot_directpainter.h>
#include <qwt_painter.h>
#include "incrementalplot.h"
#include <qpaintengine.h>
class CurveData: public QwtArraySeriesData<QPointF>
{
public:
CurveData()
{
}
virtual QRectF boundingRect() const
{
if ( d_boundingRect.width() < 0.0 )
d_boundingRect = qwtBoundingRect( *this );
return d_boundingRect;
}
inline void append( const QPointF &point )
{
d_samples += point;
}
void clear()
{
d_samples.clear();
d_samples.squeeze();
d_boundingRect = QRectF( 0.0, 0.0, -1.0, -1.0 );
}
};
IncrementalPlot::IncrementalPlot( QWidget *parent ):
QwtPlot( parent ),
d_curve( NULL )
{
d_directPainter = new QwtPlotDirectPainter( this );
if ( QwtPainter::isX11GraphicsSystem() )
{
#if QT_VERSION < 0x050000
canvas()->setAttribute( Qt::WA_PaintOutsidePaintEvent, true );
#endif
canvas()->setAttribute( Qt::WA_PaintOnScreen, true );
}
d_curve = new QwtPlotCurve( "Test Curve" );
d_curve->setData( new CurveData() );
showSymbols( true );
d_curve->attach( this );
setAutoReplot( false );
}
IncrementalPlot::~IncrementalPlot()
{
delete d_curve;
}
void IncrementalPlot::appendPoint( const QPointF &point )
{
CurveData *curveData = static_cast<CurveData *>( d_curve->data() );
curveData->append( point );
const bool doClip = !canvas()->testAttribute( Qt::WA_PaintOnScreen );
if ( doClip )
{
/*
Depending on the platform setting a clip might be an important
performance issue. F.e. for Qt Embedded this reduces the
part of the backing store that has to be copied out - maybe
to an unaccelerated frame buffer device.
*/
const QwtScaleMap xMap = canvasMap( d_curve->xAxis() );
const QwtScaleMap yMap = canvasMap( d_curve->yAxis() );
QRegion clipRegion;
const QSize symbolSize = d_curve->symbol()->size();
QRect r( 0, 0, symbolSize.width() + 2, symbolSize.height() + 2 );
const QPointF center =
QwtScaleMap::transform( xMap, yMap, point );
r.moveCenter( center.toPoint() );
clipRegion += r;
d_directPainter->setClipRegion( clipRegion );
}
d_directPainter->drawSeries( d_curve,
curveData->size() - 1, curveData->size() - 1 );
}
void IncrementalPlot::clearPoints()
{
CurveData *curveData = static_cast<CurveData *>( d_curve->data() );
curveData->clear();
replot();
}
void IncrementalPlot::showSymbols( bool on )
{
if ( on )
{
d_curve->setStyle( QwtPlotCurve::NoCurve );
d_curve->setSymbol( new QwtSymbol( QwtSymbol::XCross,
Qt::NoBrush, QPen( Qt::white ), QSize( 4, 4 ) ) );
}
else
{
d_curve->setPen( Qt::white );
d_curve->setStyle( QwtPlotCurve::Dots );
d_curve->setSymbol( NULL );
}
replot();
}
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