qwt_plot_directpainter.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_PLOT_DIRECT_PAINTER_H
#define QWT_PLOT_DIRECT_PAINTER_H
 
#include "qwt_global.h"
#include <qobject.h>
 
class QRegion;
class QwtPlotSeriesItem;
 
class QWT_EXPORT QwtPlotDirectPainter : public QObject
{
public:
    enum Attribute
    {
        AtomicPainter = 0x01,
 
        FullRepaint = 0x02,
 
        CopyBackingStore = 0x04
    };
 
    Q_DECLARE_FLAGS(Attributes, Attribute)
 
    // Constructor
    explicit QwtPlotDirectPainter(QObject* parent = nullptr);
 
    // Destructor
    ~QwtPlotDirectPainter() override;
 
    // Set attribute
    void setAttribute(Attribute, bool on);
 
    // Test attribute
    bool testAttribute(Attribute) const;
 
    // Set clipping
    void setClipping(bool);
 
    // Check if clipping is enabled
    bool hasClipping() const;
 
    // Set clip region
    void setClipRegion(const QRegion&);
 
    // Get clip region
    QRegion clipRegion() const;
 
    // Draw series
    void drawSeries(QwtPlotSeriesItem*, int from, int to);
 
    // Reset the painter
    void reset();
 
    // Event filter
    virtual bool eventFilter(QObject*, QEvent*) override;
 
private:
    QWT_DECLARE_PRIVATE(QwtPlotDirectPainter)
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QwtPlotDirectPainter::Attributes)
 
#endif