qwt_clipper.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_CLIPPER_H
#define QWT_CLIPPER_H
 
#include "qwt_global.h"
 
class QwtInterval;
class QPointF;
class QRect;
class QRectF;
class QPolygon;
class QPolygonF;
 
#if QT_VERSION < 0x060000
template< typename T > class QVector;
#endif
 
namespace QwtClipper
{
    // Clip polygon against a rectangle
    QWT_EXPORT void clipPolygon( const QRect&,
        QPolygon&, bool closePolygon = false );
 
    // Clip polygon against a float rectangle
    QWT_EXPORT void clipPolygon( const QRectF&,
        QPolygon&, bool closePolygon = false );
 
    // Clip float polygon against a float rectangle
    QWT_EXPORT void clipPolygonF( const QRectF&,
        QPolygonF&, bool closePolygon = false );
 
    // Return clipped polygon
    QWT_EXPORT QPolygon clippedPolygon( const QRect&,
        const QPolygon&, bool closePolygon = false );
 
    // Return clipped polygon (float rect)
    QWT_EXPORT QPolygon clippedPolygon( const QRectF&,
        const QPolygon&, bool closePolygon = false );
 
    // Return clipped float polygon
    QWT_EXPORT QPolygonF clippedPolygonF( const QRectF&,
        const QPolygonF&, bool closePolygon = false );
 
    // Clip circle and return arcs as intervals
    QWT_EXPORT QVector< QwtInterval > clipCircle(
        const QRectF&, const QPointF&, double radius );
};
 
#endif