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- /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
- * 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
- *****************************************************************************/
- #ifndef QWT_PLOT_TRADING_CURVE_H
- #define QWT_PLOT_TRADING_CURVE_H
- #include "qwt_global.h"
- #include "qwt_plot_seriesitem.h"
- #include "qwt_series_data.h"
- /*!
- \brief QwtPlotTradingCurve illustrates movements in the price of a
- financial instrument over time.
- QwtPlotTradingCurve supports candlestick or bar ( OHLC ) charts
- that are used in the domain of technical analysis.
- While the length ( height or width depending on orientation() )
- of each symbol depends on the corresponding OHLC sample the size
- of the other dimension can be controlled using:
- - setSymbolExtent()
- - setSymbolMinWidth()
- - setSymbolMaxWidth()
- The extent is a size in scale coordinates, so that the symbol width
- is increasing when the plot is zoomed in. Minimum/Maximum width
- is in widget coordinates independent from the zoom level.
- When setting the minimum and maximum to the same value, the width of
- the symbol is fixed.
- */
- class QWT_EXPORT QwtPlotTradingCurve:
- public QwtPlotSeriesItem, public QwtSeriesStore<QwtOHLCSample>
- {
- public:
- /*!
- \brief Symbol styles.
- The default setting is QwtPlotSeriesItem::CandleStick.
- \sa setSymbolStyle(), symbolStyle()
- */
- enum SymbolStyle
- {
- //! Nothing is displayed
- NoSymbol = -1,
- /*!
- A line on the chart shows the price range (the highest and lowest
- prices) over one unit of time, e.g. one day or one hour.
- Tick marks project from each side of the line indicating the
- opening and closing price.
- */
- Bar,
- /*!
- The range between opening/closing price are displayed as
- a filled box. The fill brush depends on the direction of the
- price movement. The box is connected to the highest/lowest
- values by lines.
- */
- CandleStick,
- /*!
- SymbolTypes >= UserSymbol are displayed by drawUserSymbol(),
- that needs to be overloaded and implemented in derived
- curve classes.
- \sa drawUserSymbol()
- */
- UserSymbol = 100
- };
- /*!
- \brief Direction of a price movement
- */
- enum Direction
- {
- //! The closing price is higher than the opening price
- Increasing,
- //! The closing price is lower than the opening price
- Decreasing
- };
- /*!
- Attributes to modify the drawing algorithm.
- \sa setPaintAttribute(), testPaintAttribute()
- */
- enum PaintAttribute
- {
- //! Check if a symbol is on the plot canvas before painting it.
- ClipSymbols = 0x01
- };
- //! Paint attributes
- typedef QFlags<PaintAttribute> PaintAttributes;
- explicit QwtPlotTradingCurve( const QString &title = QString() );
- explicit QwtPlotTradingCurve( const QwtText &title );
- virtual ~QwtPlotTradingCurve();
- virtual int rtti() const;
- void setPaintAttribute( PaintAttribute, bool on = true );
- bool testPaintAttribute( PaintAttribute ) const;
- void setSamples( const QVector<QwtOHLCSample> & );
- void setSamples( QwtSeriesData<QwtOHLCSample> * );
- void setSymbolStyle( SymbolStyle style );
- SymbolStyle symbolStyle() const;
- void setSymbolPen( const QColor &,
- qreal width = 0.0, Qt::PenStyle = Qt::SolidLine );
- void setSymbolPen( const QPen & );
- QPen symbolPen() const;
- void setSymbolBrush( Direction, const QBrush & );
- QBrush symbolBrush( Direction ) const;
- void setSymbolExtent( double );
- double symbolExtent() const;
- void setMinSymbolWidth( double );
- double minSymbolWidth() const;
- void setMaxSymbolWidth( double );
- double maxSymbolWidth() const;
- virtual void drawSeries( QPainter *painter,
- const QwtScaleMap &xMap, const QwtScaleMap &yMap,
- const QRectF &canvasRect, int from, int to ) const;
- virtual QRectF boundingRect() const;
- virtual QwtGraphic legendIcon( int index, const QSizeF & ) const;
- 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 *painter, 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:
- class PrivateData;
- PrivateData *d_data;
- };
- Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotTradingCurve::PaintAttributes )
- #endif
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