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 "qwtcore_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 QWTCORE_EXPORT QwtRasterData
{
public:
    using ContourLines = QMap< double, QPolygonF >;
 
    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;
 
    // Get the bounding interval for an axis
    virtual QwtInterval interval(Qt::Axis) const = 0;
 
    virtual QRectF pixelHint(const QRectF&) const;
 
    virtual void initRaster(const QRectF&, const QSize& raster);
    virtual void discardRaster();
 
    // Get the value at a raster position
    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:
    QwtRasterData(const QwtRasterData&)            = delete;
    QwtRasterData& operator=(const QwtRasterData&) = delete;
 
    QWT_DECLARE_PRIVATE(QwtRasterData)
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QwtRasterData::ConrecFlags)
Q_DECLARE_OPERATORS_FOR_FLAGS(QwtRasterData::Attributes)
 
#endif