1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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2 | * Qwt Widget Library
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3 | * Copyright (C) 1997 Josef Wilgen
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4 | * Copyright (C) 2002 Uwe Rathmann
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5 | *
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6 | * This library is free software; you can redistribute it and/or
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7 | * modify it under the terms of the Qwt License, Version 1.0
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8 | *****************************************************************************/
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9 |
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10 | #ifndef QWT_RASTER_DATA_H
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11 | #define QWT_RASTER_DATA_H 1
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12 |
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13 | #include "qwt_global.h"
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14 | #include "qwt_interval.h"
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15 | #include <qmap.h>
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16 | #include <qlist.h>
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17 | #include <qpolygon.h>
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18 |
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19 | class QwtScaleMap;
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20 |
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21 | /*!
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22 | \brief QwtRasterData defines an interface to any type of raster data.
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23 |
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24 | QwtRasterData is an abstract interface, that is used by
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25 | QwtPlotRasterItem to find the values at the pixels of its raster.
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26 |
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27 | Often a raster item is used to display values from a matrix. Then the
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28 | derived raster data class needs to implement some sort of resampling,
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29 | that maps the raster of the matrix into the requested raster of
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30 | the raster item ( depending on resolution and scales of the canvas ).
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31 | */
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32 | class QWT_EXPORT QwtRasterData
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33 | {
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34 | public:
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35 | //! Contour lines
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36 | typedef QMap<double, QPolygonF> ContourLines;
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37 |
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38 | //! Flags to modify the contour algorithm
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39 | enum ConrecFlag
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40 | {
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41 | //! Ignore all verices on the same level
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42 | IgnoreAllVerticesOnLevel = 0x01,
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43 |
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44 | //! Ignore all values, that are out of range
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45 | IgnoreOutOfRange = 0x02
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46 | };
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47 |
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48 | //! Flags to modify the contour algorithm
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49 | typedef QFlags<ConrecFlag> ConrecFlags;
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50 |
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51 | QwtRasterData();
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52 | virtual ~QwtRasterData();
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53 |
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54 | virtual void setInterval( Qt::Axis, const QwtInterval & );
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55 | const QwtInterval &interval(Qt::Axis) const;
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56 |
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57 | virtual QRectF pixelHint( const QRectF & ) const;
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58 |
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59 | virtual void initRaster( const QRectF &, const QSize& raster );
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60 | virtual void discardRaster();
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61 |
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62 | /*!
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63 | \return the value at a raster position
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64 | \param x X value in plot coordinates
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65 | \param y Y value in plot coordinates
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66 | */
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67 | virtual double value( double x, double y ) const = 0;
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68 |
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69 | virtual ContourLines contourLines( const QRectF &rect,
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70 | const QSize &raster, const QList<double> &levels,
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71 | ConrecFlags ) const;
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72 |
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73 | class Contour3DPoint;
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74 | class ContourPlane;
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75 |
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76 | private:
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77 | // Disabled copy constructor and operator=
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78 | QwtRasterData( const QwtRasterData & );
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79 | QwtRasterData &operator=( const QwtRasterData & );
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80 |
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81 | QwtInterval d_intervals[3];
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82 | };
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83 |
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84 | /*!
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85 | \return Bounding interval for a axis
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86 | \sa setInterval
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87 | */
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88 | inline const QwtInterval &QwtRasterData::interval( Qt::Axis axis) const
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89 | {
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90 | return d_intervals[axis];
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91 | }
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92 |
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93 | Q_DECLARE_OPERATORS_FOR_FLAGS( QwtRasterData::ConrecFlags )
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94 |
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95 | #endif
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