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#if QT_VERSION >= 0x040000
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#include <qprintdialog.h>
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#include <qwt_color_map.h>
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#include <qwt_plot_spectrogram.h>
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#include <qwt_scale_widget.h>
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#include <qwt_scale_draw.h>
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#include <qwt_plot_zoomer.h>
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#include <qwt_plot_panner.h>
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#include <qwt_plot_layout.h>
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class MyZoomer: public QwtPlotZoomer
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MyZoomer(QwtPlotCanvas *canvas):
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setTrackerMode(AlwaysOn);
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virtual QwtText trackerText(const QwtDoublePoint &pos) const
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#if QT_VERSION >= 0x040300
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QwtText text = QwtPlotZoomer::trackerText(pos);
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text.setBackgroundBrush( QBrush( bg ));
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class SpectrogramData: public QwtRasterData
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QwtRasterData(QwtDoubleRect(-1.5, -1.5, 3.0, 3.0))
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virtual QwtRasterData *copy() const
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return new SpectrogramData();
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virtual QwtDoubleInterval range() const
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return QwtDoubleInterval(0.0, 10.0);
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virtual double value(double x, double y) const
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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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Plot::Plot(QWidget *parent):
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d_spectrogram = new QwtPlotSpectrogram();
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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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d_spectrogram->setColorMap(colorMap);
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d_spectrogram->setData(SpectrogramData());
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d_spectrogram->attach(this);
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QwtValueList contourLevels;
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for ( double level = 0.5; level < 10.0; level += 1.0 )
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contourLevels += level;
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d_spectrogram->setContourLevels(contourLevels);
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// A color bar on the right axis
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QwtScaleWidget *rightAxis = axisWidget(QwtPlot::yRight);
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rightAxis->setTitle("Intensity");
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rightAxis->setColorBarEnabled(true);
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rightAxis->setColorMap(d_spectrogram->data().range(),
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d_spectrogram->colorMap());
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setAxisScale(QwtPlot::yRight,
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d_spectrogram->data().range().minValue(),
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d_spectrogram->data().range().maxValue() );
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enableAxis(QwtPlot::yRight);
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plotLayout()->setAlignCanvasToScales(true);
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// LeftButton for the zooming
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// MidButton for the panning
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// RightButton: zoom out by 1
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// Ctrl+RighButton: zoom out to full size
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QwtPlotZoomer* zoomer = new MyZoomer(canvas());
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#if QT_VERSION < 0x040000
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zoomer->setMousePattern(QwtEventPattern::MouseSelect2,
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Qt::RightButton, Qt::ControlButton);
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zoomer->setMousePattern(QwtEventPattern::MouseSelect2,
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Qt::RightButton, Qt::ControlModifier);
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zoomer->setMousePattern(QwtEventPattern::MouseSelect3,
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QwtPlotPanner *panner = new QwtPlotPanner(canvas());
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panner->setAxisEnabled(QwtPlot::yRight, false);
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panner->setMouseButton(Qt::MidButton);
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// Avoid jumping when labels with more/less digits
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// appear/disappear when scrolling vertically
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const QFontMetrics fm(axisWidget(QwtPlot::yLeft)->font());
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QwtScaleDraw *sd = axisScaleDraw(QwtPlot::yLeft);
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sd->setMinimumExtent( fm.width("100.00") );
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const QColor c(Qt::darkBlue);
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zoomer->setRubberBandPen(c);
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zoomer->setTrackerPen(c);
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void Plot::showContour(bool on)
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d_spectrogram->setDisplayMode(QwtPlotSpectrogram::ContourMode, on);
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void Plot::showSpectrogram(bool on)
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d_spectrogram->setDisplayMode(QwtPlotSpectrogram::ImageMode, on);
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d_spectrogram->setDefaultContourPen(on ? QPen() : QPen(Qt::NoPen));
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void Plot::printPlot()
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printer.setOrientation(QPrinter::Landscape);
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#if QT_VERSION < 0x040000
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printer.setColorMode(QPrinter::Color);
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printer.setOutputFileName("/tmp/spectrogram.ps");
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printer.setOutputFileName("/tmp/spectrogram.pdf");
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QPrintDialog dialog(&printer);