qwt_plot_tradingcurve.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_TRADING_CURVE_H
#define QWT_PLOT_TRADING_CURVE_H
 
#include "qwt_global.h"
#include "qwt_plot_seriesitem.h"
 
class QWT_EXPORT QwtPlotTradingCurve : public QwtPlotSeriesItem, public QwtSeriesStore< QwtOHLCSample >
{
public:
    enum SymbolStyle
    {
        NoSymbol = -1,
 
        Bar,
 
        CandleStick,
 
        UserSymbol = 100
    };
 
    enum Direction
    {
        Increasing,
 
        Decreasing
    };
 
    enum PaintAttribute
    {
        ClipSymbols = 0x01
    };
 
    Q_DECLARE_FLAGS(PaintAttributes, PaintAttribute)
 
    // Constructor
    explicit QwtPlotTradingCurve(const QString& title = QString());
    // Constructor with title
    explicit QwtPlotTradingCurve(const QwtText& title);
 
    // Destructor
    ~QwtPlotTradingCurve() override;
 
    // Get the runtime type information
    virtual int rtti() const override;
 
    // Set a paint attribute
    void setPaintAttribute(PaintAttribute, bool on = true);
    // Test a paint attribute
    bool testPaintAttribute(PaintAttribute) const;
 
    // Set the samples
    void setSamples(const QVector< QwtOHLCSample >&);
    // Set the samples
    void setSamples(QwtSeriesData< QwtOHLCSample >*);
 
    // Set the symbol style
    void setSymbolStyle(SymbolStyle style);
    // Get the symbol style
    SymbolStyle symbolStyle() const;
 
    // Set the symbol pen
    void setSymbolPen(const QColor&, qreal width = 0.0, Qt::PenStyle = Qt::SolidLine);
    // Set the symbol pen
    void setSymbolPen(const QPen&);
    // Get the symbol pen
    QPen symbolPen() const;
 
    // Set the symbol brush
    void setSymbolBrush(Direction, const QBrush&);
    // Get the symbol brush
    QBrush symbolBrush(Direction) const;
 
    // Set the symbol extent
    void setSymbolExtent(double);
    // Get the symbol extent
    double symbolExtent() const;
 
    // Set the minimum symbol width
    void setMinSymbolWidth(double);
    // Get the minimum symbol width
    double minSymbolWidth() const;
 
    // Set the maximum symbol width
    void setMaxSymbolWidth(double);
    // Get the maximum symbol width
    double maxSymbolWidth() const;
 
    // Draw the series
    virtual void drawSeries(QPainter*,
                            const QwtScaleMap& xMap,
                            const QwtScaleMap& yMap,
                            const QRectF& canvasRect,
                            int from,
                            int to) const override;
 
    // Get the bounding rectangle
    virtual QRectF boundingRect() const override;
 
    // Get the legend icon
    virtual QwtGraphic legendIcon(int index, const QSizeF&) const override;
 
protected:
    void init();
 
    virtual void
    drawSymbols(QPainter*, const QwtScaleMap& xMap, const QwtScaleMap& yMap, const QRectF& canvasRect, int from, int to) const;
 
    virtual void
    drawUserSymbol(QPainter*, SymbolStyle, const QwtOHLCSample&, Qt::Orientation, bool inverted, double symbolWidth) const;
 
    void drawBar(QPainter*, const QwtOHLCSample&, Qt::Orientation, bool inverted, double width) const;
 
    void drawCandleStick(QPainter*, const QwtOHLCSample&, Qt::Orientation, double width) const;
 
    virtual double scaledSymbolWidth(const QwtScaleMap& xMap, const QwtScaleMap& yMap, const QRectF& canvasRect) const;
 
private:
    QWT_DECLARE_PRIVATE(QwtPlotTradingCurve)
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(QwtPlotTradingCurve::PaintAttributes)
 
#endif