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00010 #ifndef QWT_PLOT_RASTERITEM_H
00011 #define QWT_PLOT_RASTERITEM_H
00012
00013 #include "qwt_global.h"
00014 #include "qwt_plot_item.h"
00015 #include "qwt_interval.h"
00016 #include <qglobal.h>
00017 #include <qstring.h>
00018 #include <qimage.h>
00019
00037 class QWT_EXPORT QwtPlotRasterItem: public QwtPlotItem
00038 {
00039 public:
00052 enum CachePolicy
00053 {
00054 NoCache,
00055 PaintCache
00056 };
00057
00076 enum PaintAttribute
00077 {
00078 PaintInDeviceResolution = 1
00079 };
00080
00081 explicit QwtPlotRasterItem( const QString& title = QString::null );
00082 explicit QwtPlotRasterItem( const QwtText& title );
00083 virtual ~QwtPlotRasterItem();
00084
00085 void setPaintAttribute( PaintAttribute, bool on = true );
00086 bool testPaintAttribute( PaintAttribute ) const;
00087
00088 void setAlpha( int alpha );
00089 int alpha() const;
00090
00091 void setCachePolicy( CachePolicy );
00092 CachePolicy cachePolicy() const;
00093
00094 void invalidateCache();
00095
00096 virtual void draw( QPainter *p,
00097 const QwtScaleMap &xMap, const QwtScaleMap &yMap,
00098 const QRectF &rect ) const;
00099
00100 virtual QRectF pixelHint( const QRectF & ) const;
00101
00102 virtual QwtInterval interval(Qt::Axis) const;
00103 virtual QRectF boundingRect() const;
00104
00105 protected:
00120 virtual QImage renderImage( const QwtScaleMap &xMap,
00121 const QwtScaleMap &yMap, const QRectF &area,
00122 const QSize &imageSize ) const = 0;
00123
00124 virtual QwtScaleMap imageMap( Qt::Orientation,
00125 const QwtScaleMap &map, const QRectF &area,
00126 const QSize &imageSize, double pixelSize) const;
00127
00128 private:
00129 QwtPlotRasterItem( const QwtPlotRasterItem & );
00130 QwtPlotRasterItem &operator=( const QwtPlotRasterItem & );
00131
00132 void init();
00133
00134 QImage compose( const QwtScaleMap &, const QwtScaleMap &,
00135 const QRectF &imageArea, const QRectF &paintRect,
00136 const QSize &imageSize, bool doCache) const;
00137
00138
00139 class PrivateData;
00140 PrivateData *d_data;
00141 };
00142
00143 #endif