106 lines
2.9 KiB
C++
106 lines
2.9 KiB
C++
/*****************************************************************************
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* Qwt Examples - Copyright (C) 2002 Uwe Rathmann
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* This file may be used under the terms of the 3-clause BSD License
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*****************************************************************************/
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#include "Plot.h"
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#include <QwtPlotMagnifier>
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#include <QwtPlotPanner>
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#include <QwtPlotPicker>
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#include <QwtPickerMachine>
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#include <QwtPlotCurve>
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#include <QwtText>
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#include <QPen>
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namespace
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{
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class DistancePicker : public QwtPlotPicker
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{
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public:
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DistancePicker( QWidget* canvas )
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: QwtPlotPicker( canvas )
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{
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setTrackerMode( QwtPicker::ActiveOnly );
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setStateMachine( new QwtPickerDragLineMachine() );
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setRubberBand( QwtPlotPicker::PolygonRubberBand );
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}
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virtual QwtText trackerTextF( const QPointF& pos ) const QWT_OVERRIDE
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{
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QwtText text;
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const QPolygon points = selection();
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if ( !points.isEmpty() )
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{
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QString num;
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num.setNum( QLineF( pos, invTransform( points[0] ) ).length() );
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QColor bg( Qt::white );
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bg.setAlpha( 200 );
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text.setBackgroundBrush( QBrush( bg ) );
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text.setText( num );
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}
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return text;
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}
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};
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}
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Plot::Plot( QWidget* parent )
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: QwtPlot( parent )
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, m_curve( NULL )
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{
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canvas()->setStyleSheet(
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"border: 2px solid Black;"
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"border-radius: 15px;"
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"background-color: qlineargradient( x1: 0, y1: 0, x2: 0, y2: 1,"
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"stop: 0 LemonChiffon, stop: 1 PaleGoldenrod );"
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);
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// attach curve
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m_curve = new QwtPlotCurve( "Scattered Points" );
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m_curve->setPen( QColor( "Purple" ) );
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// when using QwtPlotCurve::ImageBuffer simple dots can be
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// rendered in parallel on multicore systems.
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m_curve->setRenderThreadCount( 0 ); // 0: use QThread::idealThreadCount()
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m_curve->attach( this );
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setSymbol( NULL );
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// panning with the left mouse button
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(void )new QwtPlotPanner( canvas() );
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// zoom in/out with the wheel
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QwtPlotMagnifier* magnifier = new QwtPlotMagnifier( canvas() );
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magnifier->setMouseButton( Qt::NoButton );
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// distanve measurement with the right mouse button
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DistancePicker* picker = new DistancePicker( canvas() );
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picker->setMousePattern( QwtPlotPicker::MouseSelect1, Qt::RightButton );
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picker->setRubberBandPen( QPen( Qt::blue ) );
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}
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void Plot::setSymbol( QwtSymbol* symbol )
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{
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m_curve->setSymbol( symbol );
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if ( symbol == NULL )
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{
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m_curve->setStyle( QwtPlotCurve::Dots );
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}
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}
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void Plot::setSamples( const QVector< QPointF >& samples )
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{
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m_curve->setPaintAttribute(
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QwtPlotCurve::ImageBuffer, samples.size() > 1000 );
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m_curve->setSamples( samples );
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}
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#include "moc_Plot.cpp"
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