Qwt User's Guide 6.0.1

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# qwt_plot_rasteritem.h

    00001 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
    00002  * Qwt Widget Library
    00003  * Copyright (C) 1997   Josef Wilgen
    00004  * Copyright (C) 2002   Uwe Rathmann
    00005  *
    00006  * This library is free software; you can redistribute it and/or
    00007  * modify it under the terms of the Qwt License, Version 1.0
    00008  *****************************************************************************/
    00009
    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
    00062     enum PaintAttribute
    00063     {
    00076         PaintInDeviceResolution = 1
    00077     };
    00078
    00080     typedef QFlags<PaintAttribute> PaintAttributes;
    00081
    00082     explicit QwtPlotRasterItem( const QString& title = QString::null );
    00083     explicit QwtPlotRasterItem( const QwtText& title );
    00084     virtual ~QwtPlotRasterItem();
    00085
    00086     void setPaintAttribute( PaintAttribute, bool on = true );
    00087     bool testPaintAttribute( PaintAttribute ) const;
    00088
    00089     void setAlpha( int alpha );
    00090     int alpha() const;
    00091
    00092     void setCachePolicy( CachePolicy );
    00093     CachePolicy cachePolicy() const;
    00094
    00095     void invalidateCache();
    00096
    00097     virtual void draw( QPainter *p,
    00098         const QwtScaleMap &xMap, const QwtScaleMap &yMap,
    00099         const QRectF &rect ) const;
    00100
    00101     virtual QRectF pixelHint( const QRectF & ) const;
    00102
    00103     virtual QwtInterval interval(Qt::Axis) const;
    00104     virtual QRectF boundingRect() const;
    00105
    00106 protected:
    00121     virtual QImage renderImage( const QwtScaleMap &xMap,
    00122         const QwtScaleMap &yMap, const QRectF &area,
    00123         const QSize &imageSize ) const = 0;
    00124
    00125     virtual QwtScaleMap imageMap( Qt::Orientation,
    00126         const QwtScaleMap &map, const QRectF &area,
    00127         const QSize &imageSize, double pixelSize) const;
    00128
    00129 private:
    00130     QwtPlotRasterItem( const QwtPlotRasterItem & );
    00131     QwtPlotRasterItem &operator=( const QwtPlotRasterItem & );
    00132
    00133     void init();
    00134
    00135     QImage compose( const QwtScaleMap &, const QwtScaleMap &,
    00136         const QRectF &imageArea, const QRectF &paintRect,
    00137         const QSize &imageSize, bool doCache) const;
    00138
    00139
    00140     class PrivateData;
    00141     PrivateData *d_data;
    00142 };
    00143
    00144 Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotRasterItem::PaintAttributes )
    00145
    00146 #endif