qwt_plot_spectrogram.cpp

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#include <qimage.h>
#include <qpen.h>
#include <qpainter.h>
#include "qwt_painter.h"
#include "qwt_double_interval.h"
#include "qwt_scale_map.h"
#include "qwt_color_map.h"
#include "qwt_plot_spectrogram.h"

#if QT_VERSION < 0x040000
typedef QValueVector<QRgb> QwtColorTable;
#else
typedef QVector<QRgb> QwtColorTable;
#endif

class QwtPlotSpectrogramImage: public QImage
{
    // This class hides some Qt3/Qt4 API differences
public:
    QwtPlotSpectrogramImage(const QSize &size, QwtColorMap::Format format):
#if QT_VERSION < 0x040000
        QImage(size, format == QwtColorMap::RGB ? 32 : 8)
#else
        QImage(size, format == QwtColorMap::RGB
               ? QImage::Format_ARGB32 : QImage::Format_Indexed8 )
#endif
    {
    }

    QwtPlotSpectrogramImage(const QImage &other):
        QImage(other) {
    }

    void initColorTable(const QImage& other) {
#if QT_VERSION < 0x040000
        const unsigned int numColors = other.numColors();

        setNumColors(numColors);
        for ( unsigned int i = 0; i < numColors; i++ )
            setColor(i, other.color(i));
#else
        setColorTable(other.colorTable());
#endif
    }

#if QT_VERSION < 0x040000

    void setColorTable(const QwtColorTable &colorTable) {
        setNumColors(colorTable.size());
        for ( unsigned int i = 0; i < colorTable.size(); i++ )
            setColor(i, colorTable[i]);
    }

    QwtColorTable colorTable() const {
        QwtColorTable table(numColors());
        for ( int i = 0; i < numColors(); i++ )
            table[i] = color(i);

        return table;
    }
#endif