plot.cpp
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#include <qprinter.h>
#include <qprintdialog.h>
#include <qwt_color_map.h>
#include <qwt_plot_spectrogram.h>
#include <qwt_scale_widget.h>
#include <qwt_scale_draw.h>
#include <qwt_plot_zoomer.h>
#include <qwt_plot_panner.h>
#include <qwt_plot_layout.h>
#include <qwt_plot_renderer.h>
#include "plot.h"
class MyZoomer: public QwtPlotZoomer
{
public:
MyZoomer( QWidget *canvas ):
QwtPlotZoomer( canvas )
{
setTrackerMode( AlwaysOn );
}
virtual QwtText trackerTextF( const QPointF &pos ) const
{
QColor bg( Qt::white );
bg.setAlpha( 200 );
QwtText text = QwtPlotZoomer::trackerTextF( pos );
text.setBackgroundBrush( QBrush( bg ) );
return text;
}
};
class SpectrogramData: public QwtRasterData
{
public:
SpectrogramData()
{
setInterval( Qt::XAxis, QwtInterval( -1.5, 1.5 ) );
setInterval( Qt::YAxis, QwtInterval( -1.5, 1.5 ) );
setInterval( Qt::ZAxis, QwtInterval( 0.0, 10.0 ) );
}
virtual double value( double x, double y ) const
{
const double c = 0.842;
const double v1 = x * x + ( y - c ) * ( y + c );
const double v2 = x * ( y + c ) + x * ( y + c );
return 1.0 / ( v1 * v1 + v2 * v2 );
}
};
class ColorMap: public QwtLinearColorMap
{
public:
ColorMap():
QwtLinearColorMap( Qt::darkCyan, Qt::red )
{
addColorStop( 0.1, Qt::cyan );
addColorStop( 0.6, Qt::green );
addColorStop( 0.95, Qt::yellow );
}
};
Plot::Plot( QWidget *parent ):
QwtPlot( parent )
{
d_spectrogram = new QwtPlotSpectrogram();
d_spectrogram->setRenderThreadCount( 0 ); // use system specific thread count
d_spectrogram->setColorMap( new ColorMap() );
d_spectrogram->setCachePolicy( QwtPlotRasterItem::PaintCache );
d_spectrogram->setData( new SpectrogramData() );
d_spectrogram->attach( this );
QList<double> contourLevels;
for ( double level = 0.5; level < 10.0; level += 1.0 )
contourLevels += level;
d_spectrogram->setContourLevels( contourLevels );
const QwtInterval zInterval = d_spectrogram->data()->interval( Qt::ZAxis );
// A color bar on the right axis
QwtScaleWidget *rightAxis = axisWidget( QwtPlot::yRight );
rightAxis->setTitle( "Intensity" );
rightAxis->setColorBarEnabled( true );
rightAxis->setColorMap( zInterval, new ColorMap() );
setAxisScale( QwtPlot::yRight, zInterval.minValue(), zInterval.maxValue() );
enableAxis( QwtPlot::yRight );
plotLayout()->setAlignCanvasToScales( true );
replot();
// LeftButton for the zooming
// MidButton for the panning
// RightButton: zoom out by 1
// Ctrl+RighButton: zoom out to full size
QwtPlotZoomer* zoomer = new MyZoomer( canvas() );
zoomer->setMousePattern( QwtEventPattern::MouseSelect2,
Qt::RightButton, Qt::ControlModifier );
zoomer->setMousePattern( QwtEventPattern::MouseSelect3,
Qt::RightButton );
QwtPlotPanner *panner = new QwtPlotPanner( canvas() );
panner->setAxisEnabled( QwtPlot::yRight, false );
panner->setMouseButton( Qt::MidButton );
// Avoid jumping when labels with more/less digits
// appear/disappear when scrolling vertically
const QFontMetrics fm( axisWidget( QwtPlot::yLeft )->font() );
QwtScaleDraw *sd = axisScaleDraw( QwtPlot::yLeft );
sd->setMinimumExtent( fm.width( "100.00" ) );
const QColor c( Qt::darkBlue );
zoomer->setRubberBandPen( c );
zoomer->setTrackerPen( c );
}
void Plot::showContour( bool on )
{
d_spectrogram->setDisplayMode( QwtPlotSpectrogram::ContourMode, on );
replot();
}
void Plot::showSpectrogram( bool on )
{
d_spectrogram->setDisplayMode( QwtPlotSpectrogram::ImageMode, on );
d_spectrogram->setDefaultContourPen(
on ? QPen( Qt::black, 0 ) : QPen( Qt::NoPen ) );
replot();
}
void Plot::setAlpha( int alpha )
{
d_spectrogram->setAlpha( alpha );
replot();
}
#ifndef QT_NO_PRINTER
void Plot::printPlot()
{
QPrinter printer( QPrinter::HighResolution );
printer.setOrientation( QPrinter::Landscape );
printer.setOutputFileName( "spectrogram.pdf" );
QPrintDialog dialog( &printer );
if ( dialog.exec() )
{
QwtPlotRenderer renderer;
if ( printer.colorMode() == QPrinter::GrayScale )
{
renderer.setDiscardFlag( QwtPlotRenderer::DiscardBackground );
renderer.setDiscardFlag( QwtPlotRenderer::DiscardCanvasBackground );
renderer.setDiscardFlag( QwtPlotRenderer::DiscardCanvasFrame );
renderer.setLayoutFlag( QwtPlotRenderer::FrameWithScales );
}
renderer.renderTo( this, printer );
}
}
#endif