GoldenCheetah/qwt/examples/rasterview/plot.cpp

#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>
#include <qfiledialog.h>
#include <qimagewriter.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)
{
#if 0
    QwtPlotGrid *grid = new QwtPlotGrid();
    grid->setPen(QPen(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);

    canvas()->setBorderRadius( 10 );
}

void Plot::exportPlot()
{
    QString fileName = "rasterview.pdf";

#ifndef QT_NO_FILEDIALOG
    const QList<QByteArray> imageFormats =
        QImageWriter::supportedImageFormats();

    QStringList filter;
    filter += "PDF Documents (*.pdf)";
#ifndef QWT_NO_SVG
    filter += "SVG Documents (*.svg)";
#endif
    filter += "Postscript Documents (*.ps)";

    if ( imageFormats.size() > 0 )
    {
        QString imageFilter("Images (");
        for ( int i = 0; i < imageFormats.size(); i++ )
        {
            if ( i > 0 )
                imageFilter += " ";
            imageFilter += "*.";
            imageFilter += imageFormats[i];
        }
        imageFilter += ")";

        filter += imageFilter;
    }

    fileName = QFileDialog::getSaveFileName(
        this, "Export File Name", fileName,
        filter.join(";;"), NULL, QFileDialog::DontConfirmOverwrite);
#endif
    if ( !fileName.isEmpty() )
    {
        QwtPlotRenderer renderer;
        renderer.renderDocument(this, fileName, QSizeF(300, 200), 85);
    }
}

void Plot::setResampleMode(int mode)
{
    RasterData *data = (RasterData *)d_spectrogram->data();
    data->setResampleMode( (QwtMatrixRasterData::ResampleMode) mode);

    replot();
}