qwt_plot_marker.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_MARKER_H
#define QWT_PLOT_MARKER_H
 
#include "qwt_global.h"
#include "qwt_plot_item.h"
 
class QString;
class QRectF;
class QwtText;
class QwtSymbol;
 
class QWT_EXPORT QwtPlotMarker : public QwtPlotItem
{
  public:
 
    enum LineStyle
    {
        NoLine,
 
        HLine,
 
        VLine,
 
        Cross
    };
 
    explicit QwtPlotMarker();
    explicit QwtPlotMarker( const QString& title );
    explicit QwtPlotMarker( const QwtText& title );
 
    virtual ~QwtPlotMarker();
 
    virtual int rtti() const override;
 
    double xValue() const;
    double yValue() const;
    QPointF value() const;
 
    void setXValue( double );
    void setYValue( double );
    void setValue( double, double );
    void setValue( const QPointF& );
 
    void setLineStyle( LineStyle );
    LineStyle lineStyle() const;
 
    void setLinePen( const QColor&, qreal width = 0.0, Qt::PenStyle = Qt::SolidLine );
    void setLinePen( const QPen& );
    const QPen& linePen() const;
 
    void setSymbol( const QwtSymbol* );
    const QwtSymbol* symbol() const;
 
    void setLabel( const QwtText& );
    QwtText label() const;
 
    void setLabelAlignment( Qt::Alignment );
    Qt::Alignment labelAlignment() const;
 
    void setLabelOrientation( Qt::Orientation );
    Qt::Orientation labelOrientation() const;
 
    void setSpacing( int );
    int spacing() const;
 
    virtual void draw( QPainter*,
        const QwtScaleMap& xMap, const QwtScaleMap& yMap,
        const QRectF& ) const override;
 
    virtual QRectF boundingRect() const override;
 
    virtual QwtGraphic legendIcon(
        int index, const QSizeF& ) const override;
 
  protected:
    virtual void drawLines( QPainter*,
        const QRectF&, const QPointF& ) const;
 
    virtual void drawSymbol( QPainter*,
        const QRectF&, const QPointF& ) const;
 
    virtual void drawLabel( QPainter*,
        const QRectF&, const QPointF& ) const;
 
  private:
 
    class PrivateData;
    PrivateData* m_data;
};
 
#endif