qwt_plot_opengl_canvas.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_OPENGL_CANVAS_H
#define QWT_PLOT_OPENGL_CANVAS_H
 
#include "qwt_global.h"
#include "qwt_plot_abstract_canvas.h"
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
#include <QtOpenGLWidgets/QOpenGLWidget>
#else
#include <QOpenGLWidget>
#endif
#include <QSurfaceFormat>
#include <QPainterPath>
 
class QwtPlot;
 
class QWT_EXPORT QwtPlotOpenGLCanvas : public QOpenGLWidget, public QwtPlotAbstractGLCanvas
{
    Q_OBJECT
 
    Q_PROPERTY(QFrame::Shadow frameShadow READ frameShadow WRITE setFrameShadow)
    Q_PROPERTY(QFrame::Shape frameShape READ frameShape WRITE setFrameShape)
    Q_PROPERTY(int lineWidth READ lineWidth WRITE setLineWidth)
    Q_PROPERTY(int midLineWidth READ midLineWidth WRITE setMidLineWidth)
    Q_PROPERTY(int frameWidth READ frameWidth)
    Q_PROPERTY(QRect frameRect READ frameRect DESIGNABLE false)
 
    Q_PROPERTY(double borderRadius READ borderRadius WRITE setBorderRadius)
 
public:
    explicit QwtPlotOpenGLCanvas(QwtPlot* = nullptr);
    explicit QwtPlotOpenGLCanvas(const QSurfaceFormat&, QwtPlot* = nullptr);
    ~QwtPlotOpenGLCanvas() override;
 
    Q_INVOKABLE virtual void invalidateBackingStore() override;
    Q_INVOKABLE QPainterPath borderPath(const QRect&) const;
 
    virtual bool event(QEvent*) override;
 
public Q_SLOTS:
    void replot();
 
protected:
    virtual void paintEvent(QPaintEvent*) override;
 
    virtual void initializeGL() override;
    virtual void paintGL() override;
    virtual void resizeGL(int width, int height) override;
 
private:
    void init(const QSurfaceFormat&);
    virtual void clearBackingStore() override;
 
    QWT_DECLARE_PRIVATE(QwtPlotOpenGLCanvas)
};
 
#endif