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