qwt_raster_data.h 2.62 KB
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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