qwt_painter_command.h

/******************************************************************************
 * 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
 *
 * Modified by ChenZongYan in 2024 <czy.t@163.com>
 *   Summary of major modifications (see ChangeLog.md for full history):
 *   1. CMake build system & C++11 throughout.
 *   2. Core panner/ zoomer refactored:
 *        - QwtPanner → QwtCachePanner (pixmap-cache version)
 *        - New real-time QwtPlotPanner derived from QwtPicker.
 *   3. Zoomer supports multi-axis.
 *   4. Parasite-plot framework:
 *        - QwtFigure, QwtPlotParasiteLayout, QwtPlotTransparentCanvas,
 *        - QwtPlotScaleEventDispatcher, built-in pan/zoom on axis.
 *   5. New picker: QwtPlotSeriesDataPicker (works with date axis).
 *   6. Raster & color-map extensions:
 *        - QwtGridRasterData (2-D table + interpolation)
 *        - QwtLinearColorMap::stopColors(), stopPos() API rename.
 *   7. Bar-chart: expose pen/brush control.
 *   8. Amalgamated build: single QwtPlot.h / QwtPlot.cpp pair in src-amalgamate.
 *****************************************************************************/
 
#ifndef QWT_PAINTER_COMMAND_H
#define QWT_PAINTER_COMMAND_H
 
#include "qwt_global.h"
 
#include <qpaintengine.h>
#include <qpixmap.h>
#include <qimage.h>
#include <qpolygon.h>
#include <qpainterpath.h>
 
class QPainterPath;
 
class QWT_EXPORT QwtPainterCommand
{
  public:
    enum Type
    {
        Invalid = -1,
 
        Path,
 
        Pixmap,
 
        Image,
 
        State
    };
 
    struct PixmapData
    {
        QRectF rect;
        QPixmap pixmap;
        QRectF subRect;
    };
 
    struct ImageData
    {
        QRectF rect;
        QImage image;
        QRectF subRect;
        Qt::ImageConversionFlags flags;
    };
 
    struct StateData
    {
        QPaintEngine::DirtyFlags flags;
 
        QPen pen;
        QBrush brush;
        QPointF brushOrigin;
        QBrush backgroundBrush;
        Qt::BGMode backgroundMode;
        QFont font;
        QTransform transform;
 
        Qt::ClipOperation clipOperation;
        QRegion clipRegion;
        QPainterPath clipPath;
        bool isClipEnabled;
 
        QPainter::RenderHints renderHints;
        QPainter::CompositionMode compositionMode;
        qreal opacity;
    };
 
    QwtPainterCommand();
    QwtPainterCommand(const QwtPainterCommand&);
 
    explicit QwtPainterCommand( const QPainterPath& );
 
    QwtPainterCommand( const QRectF& rect,
        const QPixmap&, const QRectF& subRect );
 
    QwtPainterCommand( const QRectF& rect,
        const QImage&, const QRectF& subRect,
        Qt::ImageConversionFlags );
 
    explicit QwtPainterCommand( const QPaintEngineState& );
 
    ~QwtPainterCommand();
 
    QwtPainterCommand& operator=(const QwtPainterCommand& );
 
    Type type() const;
 
    QPainterPath* path();
    const QPainterPath* path() const;
 
    PixmapData* pixmapData();
    const PixmapData* pixmapData() const;
 
    ImageData* imageData();
    const ImageData* imageData() const;
 
    StateData* stateData();
    const StateData* stateData() const;
 
  private:
    void copy( const QwtPainterCommand& );
    void reset();
 
    Type m_type;
 
    union
    {
        QPainterPath* m_path;
        PixmapData* m_pixmapData;
        ImageData* m_imageData;
        StateData* m_stateData;
    };
};
 
inline QwtPainterCommand::Type QwtPainterCommand::type() const
{
    return m_type;
}
 
inline const QPainterPath* QwtPainterCommand::path() const
{
    return m_path;
}
 
inline const QwtPainterCommand::PixmapData*
QwtPainterCommand::pixmapData() const
{
    return m_pixmapData;
}
 
inline const QwtPainterCommand::ImageData*
QwtPainterCommand::imageData() const
{
    return m_imageData;
}
 
inline const QwtPainterCommand::StateData*
QwtPainterCommand::stateData() const
{
    return m_stateData;
}
 
#endif