qwt_raster_data.h

/******************************************************************************
 * 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
 *
 * Modified by ChenZongYan in 2024 <czy.t@163.com>
 *   Summary of major modifications (see ChangeLog.md for full history):
 *   1. CMake build system & C++11 throughout.
 *   2. Core panner/ zoomer refactored:
 *        - QwtPanner → QwtCachePanner (pixmap-cache version)
 *        - New real-time QwtPlotPanner derived from QwtPicker.
 *   3. Zoomer supports multi-axis.
 *   4. Parasite-plot framework:
 *        - QwtFigure, QwtPlotParasiteLayout, QwtPlotTransparentCanvas,
 *        - QwtPlotScaleEventDispatcher, built-in pan/zoom on axis.
 *   5. New picker: QwtPlotSeriesDataPicker (works with date axis).
 *   6. Raster & color-map extensions:
 *        - QwtGridRasterData (2-D table + interpolation)
 *        - QwtLinearColorMap::stopColors(), stopPos() API rename.
 *   7. Bar-chart: expose pen/brush control.
 *   8. Amalgamated build: single QwtPlot.h / QwtPlot.cpp pair in src-amalgamate.
 *****************************************************************************/
 
#ifndef QWT_RASTER_DATA_H
#define QWT_RASTER_DATA_H
 
#include "qwt_global.h"
#include <qnamespace.h>
 
class QwtInterval;
class QPolygonF;
class QRectF;
class QSize;
template< typename T > class QList;
template< class Key, class T > class QMap;
 
class QWT_EXPORT QwtRasterData
{
  public:
    typedef QMap< double, QPolygonF > ContourLines;
 
    enum Attribute
    {
        WithoutGaps = 0x01
    };
 
    Q_DECLARE_FLAGS( Attributes, Attribute )
 
    
    enum ConrecFlag
    {
        IgnoreAllVerticesOnLevel = 0x01,
 
        IgnoreOutOfRange = 0x02
    };
 
    Q_DECLARE_FLAGS( ConrecFlags, ConrecFlag )
 
    QwtRasterData();
    virtual ~QwtRasterData();
 
    void setAttribute( Attribute, bool on = true );
    bool testAttribute( Attribute ) const;
 
    virtual QwtInterval interval( Qt::Axis ) const = 0;
 
    virtual QRectF pixelHint( const QRectF& ) const;
 
    virtual void initRaster( const QRectF&, const QSize& raster );
    virtual void discardRaster();
 
    virtual double value( double x, double y ) const = 0;
 
    virtual ContourLines contourLines( const QRectF& rect,
        const QSize& raster, const QList< double >& levels,
        ConrecFlags ) const;
 
    class Contour3DPoint;
    class ContourPlane;
 
  private:
    Q_DISABLE_COPY(QwtRasterData)
 
    class PrivateData;
    PrivateData* m_data;
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS( QwtRasterData::ConrecFlags )
Q_DECLARE_OPERATORS_FOR_FLAGS( QwtRasterData::Attributes )
 
#endif