Sources_For_Win/Qwt/include/qwt_polar_spectrogram.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * QwtPolar Widget Library
 * Copyright (C) 2008   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
 *****************************************************************************/

#ifndef QWT_POLAR_SPECTROGRAM_H
#define QWT_POLAR_SPECTROGRAM_H

#include "qwt_polar_global.h"
#include "qwt_polar_item.h"
#include <qimage.h>

class QwtRasterData;
class QwtColorMap;

/*!
  \brief An item, which displays a spectrogram

  A spectrogram displays threedimenional data, where the 3rd dimension
  ( the intensity ) is displayed using colors. The colors are calculated
  from the values using a color map.

  \sa QwtRasterData, QwtColorMap
*/
class QWT_POLAR_EXPORT QwtPolarSpectrogram: public QwtPolarItem
{
public:
    /*!
        Attributes to modify the drawing algorithm.
        The default setting disables ApproximatedAtan

        \sa setPaintAttribute(), testPaintAttribute()
    */
    enum PaintAttribute
    {
        /*!
           Use qwtFastAtan2 instead of atan2 for translating
           widget into polar coordinates.
         */

        ApproximatedAtan = 0x01
    };

    //! Paint attributes
    typedef QFlags<PaintAttribute> PaintAttributes;

    explicit QwtPolarSpectrogram();
    virtual ~QwtPolarSpectrogram();

    void setData( QwtRasterData *data );
    const QwtRasterData *data() const;

    void setColorMap( QwtColorMap * );
    const QwtColorMap *colorMap() const;

    void setPaintAttribute( PaintAttribute, bool on = true );
    bool testPaintAttribute( PaintAttribute ) const;

    virtual int rtti() const;

    virtual void draw( QPainter *painter,
        const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
        const QPointF &pole, double radius,
        const QRectF &canvasRect ) const;

    virtual QwtInterval boundingInterval( int scaleId ) const;

protected:
    virtual QImage renderImage(
        const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
        const QPointF &pole, const QRect &rect ) const;

    virtual void renderTile(
        const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
        const QPointF &pole, const QPoint &imagePos,
        const QRect &tile, QImage *image ) const;

private:
    class TileInfo;
    void renderTile( const QwtScaleMap &, const QwtScaleMap &,
        const QPointF &pole, TileInfo * ) const;

    class PrivateData;
    PrivateData *d_data;
};

Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPolarSpectrogram::PaintAttributes )

#endif