70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
#include "plot.h"
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#include <qwt_plot_curve.h>
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#include <qwt_plot_grid.h>
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#include <qwt_symbol.h>
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#include <qwt_plot_picker.h>
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#include <qwt_scale_engine.h>
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Plot::Plot( QWidget *parent ):
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QwtPlot( parent )
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{
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setCanvasBackground( Qt::white );
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setAxisScale(QwtPlot::yLeft, 0.0, 10.0 );
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setTransformation( new QwtNullTransform() );
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populate();
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QwtPlotPicker *picker = new QwtPlotPicker( canvas() );
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picker->setTrackerMode( QwtPlotPicker::AlwaysOn );
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}
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void Plot::populate()
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{
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QwtPlotGrid *grid = new QwtPlotGrid();
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grid->setMinorPen( Qt::black, 0, Qt::DashLine );
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grid->enableXMin( true );
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grid->attach( this );
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QwtPlotCurve *curve = new QwtPlotCurve();
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curve->setTitle("Some Points");
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curve->setPen( Qt::blue, 4 ),
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curve->setRenderHint( QwtPlotItem::RenderAntialiased, true );
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QwtSymbol *symbol = new QwtSymbol( QwtSymbol::Ellipse,
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QBrush( Qt::yellow ), QPen( Qt::red, 2 ), QSize( 8, 8 ) );
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curve->setSymbol( symbol );
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QPolygonF points;
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points << QPointF( 10.0, 4.4 )
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<< QPointF( 100.0, 3.0 ) << QPointF( 200.0, 4.5 )
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<< QPointF( 300.0, 6.8 ) << QPointF( 400.0, 7.9 )
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<< QPointF( 500.0, 7.1 ) << QPointF( 600.0, 7.9 )
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<< QPointF( 700.0, 7.1 ) << QPointF( 800.0, 5.4 )
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<< QPointF( 900.0, 2.8 ) << QPointF( 1000.0, 3.6 );
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curve->setSamples( points );
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curve->attach( this );
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}
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void Plot::setTransformation( QwtTransform *transform )
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{
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QwtLinearScaleEngine *scaleEngine = new QwtLinearScaleEngine();
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scaleEngine->setTransformation( transform );
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setAxisScaleEngine( QwtPlot::xBottom, scaleEngine );
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// we have to reassign the axis settinge, because they are
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// invalidated, when the scale engine has changed
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QwtScaleDiv scaleDiv =
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axisScaleEngine( QwtPlot::xBottom )->divideScale( 10.0, 1000.0, 8, 10 );
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QList<double> ticks;
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ticks += 10.0;
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ticks += scaleDiv.ticks( QwtScaleDiv::MajorTick );
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scaleDiv.setTicks( QwtScaleDiv::MajorTick, ticks );
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setAxisScaleDiv( QwtPlot::xBottom, scaleDiv );
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replot();
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}
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