qwt_plot_rasteritem.h

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/******************************************************************************
 * 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_PLOT_RASTERITEM_H
#define QWT_PLOT_RASTERITEM_H

#include "qwt_global.h"
#include "qwt_plot_item.h"

#include <qstring.h>

class QwtInterval;

class QWT_EXPORT QwtPlotRasterItem : public QwtPlotItem
{
  public:
    enum CachePolicy
    {
        NoCache,

        PaintCache
    };

    enum PaintAttribute
    {
        PaintInDeviceResolution = 1
    };

    Q_DECLARE_FLAGS( PaintAttributes, PaintAttribute )

    explicit QwtPlotRasterItem( const QString& title = QString() );
    explicit QwtPlotRasterItem( const QwtText& title );
    virtual ~QwtPlotRasterItem();

    void setPaintAttribute( PaintAttribute, bool on = true );
    bool testPaintAttribute( PaintAttribute ) const;

    void setAlpha( int alpha );
    int alpha() const;

    void setCachePolicy( CachePolicy );
    CachePolicy cachePolicy() const;

    void invalidateCache();

    virtual void draw( QPainter*,
        const QwtScaleMap& xMap, const QwtScaleMap& yMap,
        const QRectF& canvasRect ) const QWT_OVERRIDE;

    virtual QRectF pixelHint( const QRectF& ) const;

    virtual QwtInterval interval(Qt::Axis) const;
    virtual QRectF boundingRect() const QWT_OVERRIDE;

  protected:
    virtual QImage renderImage( const QwtScaleMap& xMap,
        const QwtScaleMap& yMap, const QRectF& area,
        const QSize& imageSize ) const = 0;

    virtual QwtScaleMap imageMap( Qt::Orientation,
        const QwtScaleMap& map, const QRectF& area,
        const QSize& imageSize, double pixelSize) const;

  private:
    explicit QwtPlotRasterItem( const QwtPlotRasterItem& );
    QwtPlotRasterItem& operator=( const QwtPlotRasterItem& );

    void init();

    QImage compose( const QwtScaleMap&, const QwtScaleMap&,
        const QRectF& imageArea, const QRectF& paintRect,
        const QSize& imageSize, bool doCache) const;


    class PrivateData;
    PrivateData* m_data;
};

Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotRasterItem::PaintAttributes )

#endif