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    /* -*- 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
     *****************************************************************************/
    
    #ifndef QWT_RASTER_DATA_H
    #define QWT_RASTER_DATA_H 1
    
    #include "qwt_global.h"
    
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    #include "qwt_interval.h"
    #include <qmap.h>
    
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    #include <qlist.h>
    
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    #include <qpolygon.h>
    
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    class QwtScaleMap;
    
    /*!
      \brief QwtRasterData defines an interface to any type of raster data.
    
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      QwtRasterData is an abstract interface, that is used by
      QwtPlotRasterItem to find the values at the pixels of its raster.
    
      Often a raster item is used to display values from a matrix. Then the
      derived raster data class needs to implement some sort of resampling,
      that maps the raster of the matrix into the requested raster of
      the raster item ( depending on resolution and scales of the canvas ).
    
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    */
    class QWT_EXPORT QwtRasterData
    {
    public:
    
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        //! Contour lines
    
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        typedef QMap<double, QPolygonF> ContourLines;
    
    
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        //! Flags to modify the contour algorithm
        enum ConrecFlag
        {
            //! Ignore all vertices on the same level
            IgnoreAllVerticesOnLevel = 0x01,
    
            //! Ignore all values, that are out of range
            IgnoreOutOfRange = 0x02
    
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        };
    
    
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        //! Flags to modify the contour algorithm
        typedef QFlags<ConrecFlag> ConrecFlags;
    
    
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        QwtRasterData();
        virtual ~QwtRasterData();
    
    
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        virtual void setInterval( Qt::Axis, const QwtInterval & );
        const QwtInterval &interval(Qt::Axis) const;
    
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        virtual QRectF pixelHint( const QRectF & ) const;
    
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        virtual void initRaster( const QRectF &, const QSize& raster );
    
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        virtual void discardRaster();
    
    
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        /*!
           \return the value at a raster position
           \param x X value in plot coordinates
           \param y Y value in plot coordinates
        */
        virtual double value( double x, double y ) const = 0;
    
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        virtual ContourLines contourLines( const QRectF &rect,
            const QSize &raster, const QList<double> &levels,
            ConrecFlags ) const;
    
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        class Contour3DPoint;
        class ContourPlane;
    
    private:
    
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        // Disabled copy constructor and operator=
        QwtRasterData( const QwtRasterData & );
        QwtRasterData &operator=( const QwtRasterData & );
    
        QwtInterval d_intervals[3];
    
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    };
    
    
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    /*!
       \return Bounding interval for a axis
       \sa setInterval
    */
    inline const QwtInterval &QwtRasterData::interval( Qt::Axis axis) const
    {
        return d_intervals[axis];
    }
    
    Q_DECLARE_OPERATORS_FOR_FLAGS( QwtRasterData::ConrecFlags )
    
    
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    #endif