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);
 
    ~QwtPlotMarker() override;
 
    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:
    QWT_DECLARE_PRIVATE(QwtPlotMarker)
};
 
#endif