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