plot.cpp
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#include "plot.h"
#include <qwt_color_map.h>
#include <qwt_plot_spectrogram.h>
#include <qwt_plot_layout.h>
#include <qwt_matrix_raster_data.h>
#include <qwt_scale_widget.h>
#include <qwt_plot_magnifier.h>
#include <qwt_plot_panner.h>
#include <qwt_plot_renderer.h>
#include <qwt_plot_grid.h>
#include <qwt_plot_canvas.h>
class RasterData: public QwtMatrixRasterData
{
public:
RasterData()
{
const double matrix[] =
{
1, 2, 4, 1,
6, 3, 5, 2,
4, 2, 1, 5,
5, 4, 2, 3
};
QVector<double> values;
for ( uint i = 0; i < sizeof( matrix ) / sizeof( double ); i++ )
values += matrix[i];
const int numColumns = 4;
setValueMatrix( values, numColumns );
setInterval( Qt::XAxis,
QwtInterval( -0.5, 3.5, QwtInterval::ExcludeMaximum ) );
setInterval( Qt::YAxis,
QwtInterval( -0.5, 3.5, QwtInterval::ExcludeMaximum ) );
setInterval( Qt::ZAxis, QwtInterval( 1.0, 6.0 ) );
}
};
class ColorMap: public QwtLinearColorMap
{
public:
ColorMap():
QwtLinearColorMap( Qt::darkBlue, Qt::darkRed )
{
addColorStop( 0.2, Qt::blue );
addColorStop( 0.4, Qt::cyan );
addColorStop( 0.6, Qt::yellow );
addColorStop( 0.8, Qt::red );
}
};
Plot::Plot( QWidget *parent ):
QwtPlot( parent )
{
QwtPlotCanvas *canvas = new QwtPlotCanvas();
canvas->setBorderRadius( 10 );
setCanvas( canvas );
#if 0
QwtPlotGrid *grid = new QwtPlotGrid();
grid->setPen( Qt::DotLine );
grid->attach( this );
#endif
d_spectrogram = new QwtPlotSpectrogram();
d_spectrogram->setRenderThreadCount( 0 ); // use system specific thread count
d_spectrogram->setColorMap( new ColorMap() );
d_spectrogram->setData( new RasterData() );
d_spectrogram->attach( this );
const QwtInterval zInterval = d_spectrogram->data()->interval( Qt::ZAxis );
// A color bar on the right axis
QwtScaleWidget *rightAxis = axisWidget( QwtPlot::yRight );
rightAxis->setColorBarEnabled( true );
rightAxis->setColorBarWidth( 40 );
rightAxis->setColorMap( zInterval, new ColorMap() );
setAxisScale( QwtPlot::yRight, zInterval.minValue(), zInterval.maxValue() );
enableAxis( QwtPlot::yRight );
plotLayout()->setAlignCanvasToScales( true );
setAxisScale( QwtPlot::xBottom, 0.0, 3.0 );
setAxisMaxMinor( QwtPlot::xBottom, 0 );
setAxisScale( QwtPlot::yLeft, 0.0, 3.0 );
setAxisMaxMinor( QwtPlot::yLeft, 0 );
QwtPlotMagnifier *magnifier = new QwtPlotMagnifier( canvas );
magnifier->setAxisEnabled( QwtPlot::yRight, false );
QwtPlotPanner *panner = new QwtPlotPanner( canvas );
panner->setAxisEnabled( QwtPlot::yRight, false );
}
void Plot::exportPlot()
{
QwtPlotRenderer renderer;
renderer.exportTo( this, "rasterview.pdf" );
}
void Plot::setResampleMode( int mode )
{
RasterData *data = static_cast<RasterData *>( d_spectrogram->data() );
data->setResampleMode(
static_cast<QwtMatrixRasterData::ResampleMode>( mode ) );
replot();
}