qwt_null_paintdevice.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_NULL_PAINT_DEVICE_H
#define QWT_NULL_PAINT_DEVICE_H
 
#include "qwt_global.h"
 
#include <qpaintdevice.h>
#include <qpaintengine.h>
 
class QWT_EXPORT QwtNullPaintDevice : public QPaintDevice
{
public:
    enum Mode
    {
        NormalMode,
 
        PolygonPathMode,
 
        PathMode
    };
 
    QwtNullPaintDevice();
    ~QwtNullPaintDevice() override;
 
    void setMode(Mode);
    Mode mode() const;
 
    virtual QPaintEngine* paintEngine() const override;
 
    virtual int metric(PaintDeviceMetric) const override;
 
    virtual void drawRects(const QRect*, int);
    virtual void drawRects(const QRectF*, int);
 
    virtual void drawLines(const QLine*, int);
    virtual void drawLines(const QLineF*, int);
 
    virtual void drawEllipse(const QRectF&);
    virtual void drawEllipse(const QRect&);
 
    virtual void drawPath(const QPainterPath&);
 
    virtual void drawPoints(const QPointF*, int);
    virtual void drawPoints(const QPoint*, int);
 
    virtual void drawPolygon(const QPointF*, int, QPaintEngine::PolygonDrawMode);
 
    virtual void drawPolygon(const QPoint*, int, QPaintEngine::PolygonDrawMode);
 
    virtual void drawPixmap(const QRectF&, const QPixmap&, const QRectF&);
 
    virtual void drawTextItem(const QPointF&, const QTextItem&);
 
    virtual void drawTiledPixmap(const QRectF&, const QPixmap&, const QPointF&);
 
    virtual void drawImage(const QRectF&, const QImage&, const QRectF&, Qt::ImageConversionFlags);
 
    virtual void updateState(const QPaintEngineState&);
 
protected:
    virtual QSize sizeMetrics() const = 0;
 
private:
    class PaintEngine;
    PaintEngine* m_engine;
 
    QWT_DECLARE_PRIVATE(QwtNullPaintDevice)
};
 
#endif