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#include "lfrspectrogram.h"
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class SpectrogramData: public QwtRasterData
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{
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public:
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SpectrogramData():
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QwtRasterData(QwtDoubleRect(-1.5, -1.5, 3.0, 3.0))
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{
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}
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virtual QwtRasterData *copy() const
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{
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return new SpectrogramData();
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}
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virtual QwtDoubleInterval range() const
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{
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return QwtDoubleInterval(0.0, 10.0);
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}
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virtual double value(double x, double y) const
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{
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const double c = 0.842;
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const double v1 = x * x + (y-c) * (y+c);
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const double v2 = x * (y+c) + x * (y+c);
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return 1.0 / (v1 * v1 + v2 * v2);
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}
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};
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LFRSpectrogram::LFRSpectrogram(QWidget *parent) :
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QWidget(parent)
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{
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mainLayout = new QVBoxLayout();
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plot_spectrogram = new QwtPlot();
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spectrogram = new QwtPlotSpectrogram(tr("spectrogram"));
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QwtLinearColorMap colorMap(Qt::darkCyan, Qt::red);
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colorMap.addColorStop(0.1, Qt::cyan);
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colorMap.addColorStop(0.6, Qt::green);
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colorMap.addColorStop(0.95, Qt::yellow);
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spectrogram->setColorMap(colorMap);
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spectrogram->setData( SpectrogramData() );
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spectrogram->attach(plot_spectrogram);
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// A color bar on the right axis
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QwtScaleWidget *rightAxis = plot_spectrogram->axisWidget(QwtPlot::yRight);
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rightAxis->setTitle("Intensity");
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rightAxis->setColorBarEnabled(true);
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rightAxis->setColorMap(spectrogram->data().range(),
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spectrogram->colorMap());
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plot_spectrogram->setAxisScale(QwtPlot::yRight,
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spectrogram->data().range().minValue(),
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spectrogram->data().range().maxValue() );
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plot_spectrogram->enableAxis(QwtPlot::yRight);
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plot_spectrogram->plotLayout()->setAlignCanvasToScales(true);
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plot_spectrogram->replot();
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mainLayout->addWidget(plot_spectrogram);
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this->setLayout(mainLayout);
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}
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