142 lines
3.2 KiB
C++
142 lines
3.2 KiB
C++
#include <qglobal.h>
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#include <qtimer.h>
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#include <qwt_plot_grid.h>
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#include <qwt_plot_canvas.h>
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#include <qwt_plot_layout.h>
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#include <qwt_scale_widget.h>
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#include <qwt_scale_draw.h>
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#include "scrollzoomer.h"
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#include "randomplot.h"
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const unsigned int c_rangeMax = 1000;
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class Zoomer: public ScrollZoomer
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{
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public:
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Zoomer( QWidget *canvas ):
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ScrollZoomer( canvas )
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{
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#if 0
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setRubberBandPen( QPen( Qt::red, 2, Qt::DotLine ) );
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#else
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setRubberBandPen( QPen( Qt::red ) );
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#endif
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}
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virtual QwtText trackerTextF( const QPointF &pos ) const
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{
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QColor bg( Qt::white );
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QwtText text = QwtPlotZoomer::trackerTextF( pos );
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text.setBackgroundBrush( QBrush( bg ) );
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return text;
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}
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virtual void rescale()
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{
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QwtScaleWidget *scaleWidget = plot()->axisWidget( yAxis() );
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QwtScaleDraw *sd = scaleWidget->scaleDraw();
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double minExtent = 0.0;
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if ( zoomRectIndex() > 0 )
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{
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// When scrolling in vertical direction
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// the plot is jumping in horizontal direction
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// because of the different widths of the labels
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// So we better use a fixed extent.
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minExtent = sd->spacing() + sd->maxTickLength() + 1;
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minExtent += sd->labelSize(
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scaleWidget->font(), c_rangeMax ).width();
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}
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sd->setMinimumExtent( minExtent );
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ScrollZoomer::rescale();
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}
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};
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RandomPlot::RandomPlot( QWidget *parent ):
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IncrementalPlot( parent ),
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d_timer( 0 ),
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d_timerCount( 0 )
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{
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setFrameStyle( QFrame::NoFrame );
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setLineWidth( 0 );
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plotLayout()->setAlignCanvasToScales( true );
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QwtPlotGrid *grid = new QwtPlotGrid;
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grid->setMajorPen( Qt::gray, 0, Qt::DotLine );
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grid->attach( this );
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setCanvasBackground( QColor( 29, 100, 141 ) ); // nice blue
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setAxisScale( xBottom, 0, c_rangeMax );
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setAxisScale( yLeft, 0, c_rangeMax );
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replot();
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// enable zooming
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( void ) new Zoomer( canvas() );
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}
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QSize RandomPlot::sizeHint() const
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{
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return QSize( 540, 400 );
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}
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void RandomPlot::appendPoint()
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{
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double x = qrand() % c_rangeMax;
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x += ( qrand() % 100 ) / 100;
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double y = qrand() % c_rangeMax;
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y += ( qrand() % 100 ) / 100;
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IncrementalPlot::appendPoint( QPointF( x, y ) );
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if ( --d_timerCount <= 0 )
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stop();
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}
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void RandomPlot::append( int timeout, int count )
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{
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if ( !d_timer )
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{
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d_timer = new QTimer( this );
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connect( d_timer, SIGNAL( timeout() ), SLOT( appendPoint() ) );
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}
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d_timerCount = count;
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Q_EMIT running( true );
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d_timeStamp.start();
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QwtPlotCanvas *plotCanvas = qobject_cast<QwtPlotCanvas *>( canvas() );
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plotCanvas->setPaintAttribute( QwtPlotCanvas::BackingStore, false );
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d_timer->start( timeout );
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}
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void RandomPlot::stop()
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{
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Q_EMIT elapsed( d_timeStamp.elapsed() );
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if ( d_timer )
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{
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d_timer->stop();
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Q_EMIT running( false );
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}
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QwtPlotCanvas *plotCanvas = qobject_cast<QwtPlotCanvas *>( canvas() );
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plotCanvas->setPaintAttribute( QwtPlotCanvas::BackingStore, true );
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}
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void RandomPlot::clear()
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{
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clearPoints();
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replot();
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}
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