qwt_point_mapper.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_POINT_MAPPER_H
#define QWT_POINT_MAPPER_H
 
#include "qwt_global.h"
 
class QwtScaleMap;
template< typename T >
class QwtSeriesData;
class QPolygonF;
class QPointF;
class QRectF;
class QPolygon;
class QPen;
class QImage;
 
class QWT_EXPORT QwtPointMapper
{
public:
    enum TransformationFlag
    {
        RoundPoints = 0x01,
 
        WeedOutPoints = 0x02,
 
        WeedOutIntermediatePoints = 0x04,
 
        PixelColumnReduce = 0x08,
 
        LTTBReduce = 0x20,
 
        MinMaxReduce = 0x10,
 
        AdaptiveColumnReduce = 0x40
    };
 
    Q_DECLARE_FLAGS(TransformationFlags, TransformationFlag)
 
    // Constructor
    QwtPointMapper();
    // Destructor
    ~QwtPointMapper();
 
    // Set the transformation flags
    void setFlags(TransformationFlags);
    // Get the transformation flags
    TransformationFlags flags() const;
 
    // Set or clear a transformation flag
    void setFlag(TransformationFlag, bool on = true);
    // Test if a transformation flag is set
    bool testFlag(TransformationFlag) const;
 
    // Set the bounding rectangle for mapping
    void setBoundingRect(const QRectF&);
    // Get the bounding rectangle
    QRectF boundingRect() const;
 
    // Set the device pixel ratio of the target paint device
    void setDevicePixelRatio(qreal ratio);
    // Get the device pixel ratio of the target paint device
    qreal devicePixelRatio() const;
 
    // Translate a series of points into a QPolygonF
    QPolygonF
    toPolygonF(const QwtScaleMap& xMap, const QwtScaleMap& yMap, const QwtSeriesData< QPointF >* series, int from, int to) const;
 
    // Translate a series of points into a QPolygon
    QPolygon
    toPolygon(const QwtScaleMap& xMap, const QwtScaleMap& yMap, const QwtSeriesData< QPointF >* series, int from, int to) const;
 
    // Translate a series of points into a QPolygon (scattered points)
    QPolygon
    toPoints(const QwtScaleMap& xMap, const QwtScaleMap& yMap, const QwtSeriesData< QPointF >* series, int from, int to) const;
 
    // Translate a series of points into a QPolygonF (scattered points)
    QPolygonF
    toPointsF(const QwtScaleMap& xMap, const QwtScaleMap& yMap, const QwtSeriesData< QPointF >* series, int from, int to) const;
 
    // Translate a series into a QImage
    QImage toImage(const QwtScaleMap& xMap,
                   const QwtScaleMap& yMap,
                   const QwtSeriesData< QPointF >* series,
                   int from,
                   int to,
                   const QPen&,
                   bool antialiased,
                   uint numThreads) const;
 
private:
    QwtPointMapper(const QwtPointMapper&)            = delete;
    QwtPointMapper& operator=(const QwtPointMapper&) = delete;
 
    QWT_DECLARE_PRIVATE(QwtPointMapper)
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QwtPointMapper::TransformationFlags)
 
#endif