qwt_plot_vectorfield.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_VECTOR_FIELD_H
#define QWT_PLOT_VECTOR_FIELD_H
 
#include "qwt_global.h"
#include "qwt_plot_seriesitem.h"
 
class QwtVectorFieldSymbol;
class QwtColorMap;
class QPen;
class QBrush;
 
class QWT_EXPORT QwtPlotVectorField
    : public QwtPlotSeriesItem
    , public QwtSeriesStore< QwtVectorFieldSample >
{
  public:
    enum IndicatorOrigin
    {
        OriginHead,
 
        OriginTail,
 
        OriginCenter
    };
 
    enum PaintAttribute
    {
        /*
            FilterVectors calculates an average sample from all samples
            that lie in the same cell of a grid that is determined by
            setting the rasterSize().
 
            \sa setRasterSize()
         */
        FilterVectors        = 0x01
    };
 
    Q_DECLARE_FLAGS( PaintAttributes, PaintAttribute )
 
    
    enum MagnitudeMode
    {
        MagnitudeAsColor = 0x01,
 
        MagnitudeAsLength = 0x02
    };
 
    Q_DECLARE_FLAGS( MagnitudeModes, MagnitudeMode )
 
    explicit QwtPlotVectorField( const QString& title = QString() );
    explicit QwtPlotVectorField( const QwtText& title );
 
    virtual ~QwtPlotVectorField();
 
    void setPaintAttribute( PaintAttribute, bool on = true );
    bool testPaintAttribute( PaintAttribute ) const;
 
    void setMagnitudeMode( MagnitudeMode, bool on = true );
    bool testMagnitudeMode( MagnitudeMode ) const;
 
    void setSymbol( QwtVectorFieldSymbol* );
    const QwtVectorFieldSymbol* symbol() const;
 
    void setPen( const QPen& );
    QPen pen() const;
 
    void setBrush( const QBrush& );
    QBrush brush() const;
 
    void setRasterSize( const QSizeF& );
    QSizeF rasterSize() const;
 
    void setIndicatorOrigin( IndicatorOrigin );
    IndicatorOrigin indicatorOrigin() const;
 
    void setSamples( const QVector< QwtVectorFieldSample >& );
    void setSamples( QwtVectorFieldData* );
 
    void setColorMap( QwtColorMap* );
    const QwtColorMap* colorMap() const;
 
    void setMagnitudeRange( const QwtInterval& );
    QwtInterval magnitudeRange() const;
 
    void setMinArrowLength( double );
    double minArrowLength() const;
 
    void setMaxArrowLength( double );
    double maxArrowLength() const;
 
    virtual double arrowLength( double magnitude ) const;
 
    virtual QRectF boundingRect() const QWT_OVERRIDE;
 
    virtual void drawSeries( QPainter*,
        const QwtScaleMap& xMap, const QwtScaleMap& yMap,
        const QRectF& canvasRect, int from, int to ) const QWT_OVERRIDE;
 
    virtual int rtti() const QWT_OVERRIDE;
 
    virtual QwtGraphic legendIcon(
        int index, const QSizeF& ) const QWT_OVERRIDE;
 
    void setMagnitudeScaleFactor( double factor );
    double magnitudeScaleFactor() const;
 
  protected:
    virtual void drawSymbols( QPainter*,
        const QwtScaleMap& xMap, const QwtScaleMap& yMap,
        const QRectF& canvasRect, int from, int to ) const;
 
    virtual void drawSymbol( QPainter*,
        double x, double y, double vx, double vy ) const;
 
    virtual void dataChanged() QWT_OVERRIDE;
 
  private:
    void init();
 
    class PrivateData;
    PrivateData* m_data;
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotVectorField::PaintAttributes )
Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotVectorField::MagnitudeModes )
 
#endif