756 lines
19 KiB
Groff
756 lines
19 KiB
Groff
.TH "QwtPlotTradingCurve" 3 "Sun Jul 18 2021" "Version 6.2.0" "Qwt User's Guide" \" -*- nroff -*-
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.ad l
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.nh
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.SH NAME
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QwtPlotTradingCurve \- \fBQwtPlotTradingCurve\fP illustrates movements in the price of a financial instrument over time\&.
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.SH SYNOPSIS
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.br
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.PP
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.PP
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\fC#include <qwt_plot_tradingcurve\&.h>\fP
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.PP
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Inherits \fBQwtPlotSeriesItem\fP, and \fBQwtSeriesStore< QwtOHLCSample >\fP\&.
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.SS "Public Types"
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.in +1c
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.ti -1c
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.RI "enum \fBSymbolStyle\fP { \fBNoSymbol\fP = -1, \fBBar\fP, \fBCandleStick\fP, \fBUserSymbol\fP = 100 }"
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.br
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.RI "Symbol styles\&. "
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.ti -1c
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.RI "enum \fBDirection\fP { \fBIncreasing\fP, \fBDecreasing\fP }"
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.br
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.RI "Direction of a price movement\&. "
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.ti -1c
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.RI "enum \fBPaintAttribute\fP { \fBClipSymbols\fP = 0x01 }"
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.br
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.ti -1c
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.RI "typedef QFlags< \fBPaintAttribute\fP > \fBPaintAttributes\fP"
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.br
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.in -1c
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.SS "Public Member Functions"
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.RI "\fBQwtPlotTradingCurve\fP (const QString &\fBtitle\fP=QString())"
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.RI "\fBQwtPlotTradingCurve\fP (const \fBQwtText\fP &\fBtitle\fP)"
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.ti -1c
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.RI "virtual \fB~QwtPlotTradingCurve\fP ()"
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.RI "Destructor\&. "
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.ti -1c
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.RI "virtual int \fBrtti\fP () const override"
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.br
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.ti -1c
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.RI "void \fBsetPaintAttribute\fP (\fBPaintAttribute\fP, bool on=true)"
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.ti -1c
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.RI "bool \fBtestPaintAttribute\fP (\fBPaintAttribute\fP) const"
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.ti -1c
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.RI "void \fBsetSamples\fP (const \fBQVector\fP< \fBQwtOHLCSample\fP > &)"
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.br
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.ti -1c
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.RI "void \fBsetSamples\fP (\fBQwtSeriesData\fP< \fBQwtOHLCSample\fP > *)"
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.RI "void \fBsetSymbolStyle\fP (\fBSymbolStyle\fP style)"
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.RI "\fBSymbolStyle\fP \fBsymbolStyle\fP () const"
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.RI "void \fBsetSymbolPen\fP (const QColor &, qreal width=0\&.0, Qt::PenStyle=Qt::SolidLine)"
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.br
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.ti -1c
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.RI "void \fBsetSymbolPen\fP (const QPen &)"
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.br
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.RI "Set the symbol pen\&. "
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.RI "QPen \fBsymbolPen\fP () const"
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.br
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.RI "void \fBsetSymbolBrush\fP (\fBDirection\fP, const QBrush &)"
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.RI "QBrush \fBsymbolBrush\fP (\fBDirection\fP) const"
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.RI "void \fBsetSymbolExtent\fP (double)"
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.RI "Set the extent of the symbol\&. "
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.RI "double \fBsymbolExtent\fP () const"
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.br
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.RI "void \fBsetMinSymbolWidth\fP (double)"
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.RI "double \fBminSymbolWidth\fP () const"
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.RI "void \fBsetMaxSymbolWidth\fP (double)"
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.br
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.RI "double \fBmaxSymbolWidth\fP () const"
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.br
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.ti -1c
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.RI "virtual void \fBdrawSeries\fP (QPainter *, const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRectF &canvasRect, int from, int to) const override"
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.br
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.RI "virtual QRectF \fBboundingRect\fP () const override"
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.br
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.ti -1c
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.RI "virtual \fBQwtGraphic\fP \fBlegendIcon\fP (int index, const QSizeF &) const override"
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.br
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.in -1c
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.SS "Protected Member Functions"
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.in +1c
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.RI "void \fBinit\fP ()"
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.br
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.RI "Initialize internal members\&. "
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.ti -1c
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.RI "virtual void \fBdrawSymbols\fP (QPainter *, const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRectF &canvasRect, int from, int to) const"
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.br
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.ti -1c
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.RI "virtual void \fBdrawUserSymbol\fP (QPainter *, \fBSymbolStyle\fP, const \fBQwtOHLCSample\fP &, Qt::Orientation, bool inverted, double symbolWidth) const"
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.br
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.RI "Draw a symbol for a symbol style >= UserSymbol\&. "
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.ti -1c
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.RI "void \fBdrawBar\fP (QPainter *, const \fBQwtOHLCSample\fP &, Qt::Orientation, bool inverted, double width) const"
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.br
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.RI "Draw a bar\&. "
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.ti -1c
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.RI "void \fBdrawCandleStick\fP (QPainter *, const \fBQwtOHLCSample\fP &, Qt::Orientation, double width) const"
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.br
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.RI "Draw a candle stick\&. "
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.ti -1c
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.RI "virtual double \fBscaledSymbolWidth\fP (const \fBQwtScaleMap\fP &xMap, const \fBQwtScaleMap\fP &yMap, const QRectF &canvasRect) const"
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.br
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.in -1c
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.SH "Detailed Description"
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.PP
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\fBQwtPlotTradingCurve\fP illustrates movements in the price of a financial instrument over time\&.
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\fBQwtPlotTradingCurve\fP supports candlestick or bar ( OHLC ) charts that are used in the domain of technical analysis\&.
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.PP
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While the length ( height or width depending on \fBorientation()\fP ) of each symbol depends on the corresponding OHLC sample the size of the other dimension can be controlled using:
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.PP
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.IP "\(bu" 2
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\fBsetSymbolExtent()\fP
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.IP "\(bu" 2
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setSymbolMinWidth()
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.IP "\(bu" 2
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setSymbolMaxWidth()
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.PP
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.PP
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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\&.
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.PP
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Definition at line 37 of file qwt_plot_tradingcurve\&.h\&.
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.SH "Member Typedef Documentation"
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.PP
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.SS "typedef QFlags<\fBPaintAttribute\fP > \fBQwtPlotTradingCurve::PaintAttributes\fP"
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An ORed combination of \fBPaintAttribute\fP values\&.
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.PP
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Definition at line 101 of file qwt_plot_tradingcurve\&.h\&.
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.SH "Member Enumeration Documentation"
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.PP
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.SS "enum \fBQwtPlotTradingCurve::Direction\fP"
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.PP
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Direction of a price movement\&.
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.PP
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\fBEnumerator\fP
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.in +1c
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.TP
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\fB\fIIncreasing \fP\fP
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The closing price is higher than the opening price\&.
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.TP
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\fB\fIDecreasing \fP\fP
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The closing price is lower than the opening price\&.
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.PP
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Definition at line 82 of file qwt_plot_tradingcurve\&.h\&.
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.SS "enum \fBQwtPlotTradingCurve::PaintAttribute\fP"
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Attributes to modify the drawing algorithm\&.
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetPaintAttribute()\fP, \fBtestPaintAttribute()\fP
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.RE
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.PP
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.PP
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\fBEnumerator\fP
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.in +1c
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.TP
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\fB\fIClipSymbols \fP\fP
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Check if a symbol is on the plot canvas before painting it\&.
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.PP
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Definition at line 95 of file qwt_plot_tradingcurve\&.h\&.
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.SS "enum \fBQwtPlotTradingCurve::SymbolStyle\fP"
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.PP
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Symbol styles\&. The default setting is QwtPlotSeriesItem::CandleStick\&.
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetSymbolStyle()\fP, \fBsymbolStyle()\fP
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.RE
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.PP
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.PP
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\fBEnumerator\fP
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.in +1c
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.TP
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\fB\fINoSymbol \fP\fP
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Nothing is displayed\&.
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.TP
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\fB\fIBar \fP\fP
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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\&.
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.TP
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\fB\fICandleStick \fP\fP
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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\&.
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.TP
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\fB\fIUserSymbol \fP\fP
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SymbolTypes >= UserSymbol are displayed by \fBdrawUserSymbol()\fP, that needs to be overloaded and implemented in derived curve classes\&.
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.PP
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\fBSee also\fP
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.RS 4
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\fBdrawUserSymbol()\fP
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.RE
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.PP
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.PP
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Definition at line 48 of file qwt_plot_tradingcurve\&.h\&.
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.SH "Constructor & Destructor Documentation"
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.PP
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.SS "QwtPlotTradingCurve::QwtPlotTradingCurve (const QString & title = \fCQString()\fP)\fC [explicit]\fP"
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Constructor
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.PP
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\fBParameters\fP
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.RS 4
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\fItitle\fP Title of the curve
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.RE
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.PP
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.PP
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Definition at line 70 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "QwtPlotTradingCurve::QwtPlotTradingCurve (const \fBQwtText\fP & title)\fC [explicit]\fP"
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Constructor
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.PP
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\fBParameters\fP
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.RS 4
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\fItitle\fP Title of the curve
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.RE
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.PP
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.PP
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Definition at line 60 of file qwt_plot_tradingcurve\&.cpp\&.
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.SH "Member Function Documentation"
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.PP
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.SS "QRectF QwtPlotTradingCurve::boundingRect () const\fC [override]\fP, \fC [virtual]\fP"
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.PP
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\fBReturns\fP
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.RS 4
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Bounding rectangle of all samples\&. For an empty series the rectangle is invalid\&.
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.RE
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.PP
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.PP
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Reimplemented from \fBQwtPlotSeriesItem\fP\&.
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.PP
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Definition at line 365 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::drawBar (QPainter * painter, const \fBQwtOHLCSample\fP & sample, Qt::Orientation orientation, bool inverted, double width) const\fC [protected]\fP"
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.PP
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Draw a bar\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Qt painter, initialized with pen/brush
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\fIsample\fP Sample, already translated into paint device coordinates
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\fIorientation\fP Vertical or horizontal
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\fIinverted\fP When inverted is false the open tick is painted to the left/top, otherwise it is painted right/bottom\&. The close tick is painted in the opposite direction of the open tick\&. painted in the opposite d opposite direction\&.
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.br
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\fIwidth\fP Width or height of the candle, depending on the orientation
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBBar\fP
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.RE
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.PP
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.PP
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Definition at line 562 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::drawCandleStick (QPainter * painter, const \fBQwtOHLCSample\fP & sample, Qt::Orientation orientation, double width) const\fC [protected]\fP"
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.PP
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Draw a candle stick\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Qt painter, initialized with pen/brush
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.br
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\fIsample\fP Samples already translated into paint device coordinates
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.br
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\fIorientation\fP Vertical or horizontal
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.br
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\fIwidth\fP Width or height of the candle, depending on the orientation
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBCandleStick\fP
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.RE
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.PP
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.PP
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Definition at line 601 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::drawSeries (QPainter * painter, const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRectF & canvasRect, int from, int to) const\fC [override]\fP, \fC [virtual]\fP"
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Draw an interval of the curve
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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.br
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\fIxMap\fP Maps x-values into pixel coordinates\&.
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.br
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\fIyMap\fP Maps y-values into pixel coordinates\&.
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.br
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\fIcanvasRect\fP Contents rectangle of the canvas
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.br
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\fIfrom\fP Index of the first point to be painted
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\fIto\fP Index of the last point to be painted\&. If to < 0 the curve will be painted to its last point\&.
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBdrawSymbols()\fP
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.RE
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.PP
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.PP
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Implements \fBQwtPlotSeriesItem\fP\&.
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.PP
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Definition at line 387 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::drawSymbols (QPainter * painter, const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRectF & canvasRect, int from, int to) const\fC [protected]\fP, \fC [virtual]\fP"
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Draw symbols
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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\fIxMap\fP x map
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.br
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\fIyMap\fP y map
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\fIcanvasRect\fP Contents rectangle of the canvas
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.br
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\fIfrom\fP Index of the first point to be painted
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.br
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\fIto\fP Index of the last point to be painted
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBdrawSeries()\fP
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.RE
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.PP
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.PP
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Definition at line 420 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::drawUserSymbol (QPainter * painter, \fBSymbolStyle\fP symbolStyle, const \fBQwtOHLCSample\fP & sample, Qt::Orientation orientation, bool inverted, double symbolWidth) const\fC [protected]\fP, \fC [virtual]\fP"
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.PP
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Draw a symbol for a symbol style >= UserSymbol\&. The implementation does nothing and is intended to be overloaded
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Qt painter, initialized with pen/brush
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.br
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\fIsymbolStyle\fP Symbol style
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.br
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\fIsample\fP Samples already translated into paint device coordinates
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.br
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\fIorientation\fP Vertical or horizontal
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\fIinverted\fP True, when the opposite scale ( Qt::Vertical: x, Qt::Horizontal: y ) is increasing in the opposite direction as QPainter coordinates\&.
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.br
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\fIsymbolWidth\fP Width of the symbol in paint device coordinates
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.RE
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.PP
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.PP
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Definition at line 534 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "\fBQwtGraphic\fP QwtPlotTradingCurve::legendIcon (int index, const QSizeF & size) const\fC [override]\fP, \fC [virtual]\fP"
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.PP
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\fBReturns\fP
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.RS 4
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A rectangle filled with the color of the symbol pen
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.RE
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.PP
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\fBParameters\fP
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.RS 4
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\fIindex\fP Index of the legend entry ( usually there is only one )
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.br
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\fIsize\fP Icon size
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetLegendIconSize()\fP, \fBlegendData()\fP
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.RE
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.PP
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.PP
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Reimplemented from \fBQwtPlotItem\fP\&.
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.PP
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Definition at line 642 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "double QwtPlotTradingCurve::maxSymbolWidth () const"
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.PP
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\fBReturns\fP
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.RS 4
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Maximum for the symbol width
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetMaxSymbolWidth()\fP, \fBminSymbolWidth()\fP, \fBsymbolExtent()\fP
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.RE
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.PP
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.PP
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Definition at line 356 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "double QwtPlotTradingCurve::minSymbolWidth () const"
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.PP
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\fBReturns\fP
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.RS 4
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Minmum for the symbol width
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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\fBsetMinSymbolWidth()\fP, \fBmaxSymbolWidth()\fP, \fBsymbolExtent()\fP
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.RE
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.PP
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.PP
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Definition at line 328 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "int QwtPlotTradingCurve::rtti () const\fC [override]\fP, \fC [virtual]\fP"
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.PP
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\fBReturns\fP
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\fBQwtPlotItem::Rtti_PlotTradingCurve\fP
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Reimplemented from \fBQwtPlotItem\fP\&.
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Definition at line 95 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "double QwtPlotTradingCurve::scaledSymbolWidth (const \fBQwtScaleMap\fP & xMap, const \fBQwtScaleMap\fP & yMap, const QRectF & canvasRect) const\fC [protected]\fP, \fC [virtual]\fP"
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Calculate the symbol width in paint coordinates
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.PP
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The width is calculated by scaling the symbol extent into paint device coordinates bounded by the minimum/maximum symbol width\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fIxMap\fP Maps x-values into pixel coordinates\&.
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.br
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\fIyMap\fP Maps y-values into pixel coordinates\&.
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.br
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\fIcanvasRect\fP Contents rectangle of the canvas
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\fBReturns\fP
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.RS 4
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Symbol width in paint coordinates
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\fBSee also\fP
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\fBsymbolExtent()\fP, \fBminSymbolWidth()\fP, \fBmaxSymbolWidth()\fP
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Definition at line 664 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::setMaxSymbolWidth (double width)"
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Set a maximum for the symbol width
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.PP
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A value <= 0\&.0 means an unlimited width
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\fBParameters\fP
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\fIwidth\fP Width in paint device coordinates
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\fBSee also\fP
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\fBmaxSymbolWidth()\fP, \fBsetMinSymbolWidth()\fP, \fBsetSymbolExtent()\fP
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Definition at line 341 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::setMinSymbolWidth (double width)"
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Set a minimum for the symbol width
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\fBParameters\fP
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\fIwidth\fP Width in paint device coordinates
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\fBSee also\fP
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\fBminSymbolWidth()\fP, \fBsetMaxSymbolWidth()\fP, \fBsetSymbolExtent()\fP
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Definition at line 312 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::setPaintAttribute (\fBPaintAttribute\fP attribute, bool on = \fCtrue\fP)"
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Specify an attribute how to draw the curve
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\fBParameters\fP
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\fIattribute\fP Paint attribute
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\fIon\fP On/Off
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\fBSee also\fP
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Definition at line 107 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::setSamples (const \fBQVector\fP< \fBQwtOHLCSample\fP > & samples)"
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Initialize data with an array of samples\&.
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\fBParameters\fP
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\fIsamples\fP Vector of samples
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\fBSee also\fP
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QwtPlotSeriesItem::setData()
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Definition at line 132 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::setSamples (\fBQwtSeriesData\fP< \fBQwtOHLCSample\fP > * data)"
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Assign a series of samples
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.PP
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\fBsetSamples()\fP is just a wrapper for \fBsetData()\fP without any additional value - beside that it is easier to find for the developer\&.
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\fBParameters\fP
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\fIdata\fP Data
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\fBWarning\fP
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The item takes ownership of the data object, deleting it when its not used anymore\&.
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Definition at line 148 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::setSymbolBrush (\fBDirection\fP direction, const QBrush & brush)"
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Set the symbol brush
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\fBParameters\fP
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\fIdirection\fP Direction type
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.br
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\fIbrush\fP Brush used to fill the body of all candlestick symbols with the direction
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\fBSee also\fP
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\fBsymbolBrush()\fP, \fBsetSymbolPen()\fP
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Definition at line 238 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::setSymbolExtent (double extent)"
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.PP
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Set the extent of the symbol\&. The width of the symbol is given in scale coordinates\&. When painting a symbol the width is scaled into paint device coordinates by \fBscaledSymbolWidth()\fP\&. The scaled width is bounded by \fBminSymbolWidth()\fP, \fBmaxSymbolWidth()\fP
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\fBParameters\fP
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\fIextent\fP Symbol width in scale coordinates
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\fBSee also\fP
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\fBsymbolExtent()\fP, \fBscaledSymbolWidth()\fP, \fBsetMinSymbolWidth()\fP, \fBsetMaxSymbolWidth()\fP
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Definition at line 284 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::setSymbolPen (const QColor & color, qreal width = \fC0\&.0\fP, Qt::PenStyle style = \fCQt::SolidLine\fP)"
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Build and assign the symbol pen
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.PP
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In Qt5 the default pen width is 1\&.0 ( 0\&.0 in Qt4 ) what makes it non cosmetic ( see QPen::isCosmetic() )\&. This method has been introduced to hide this incompatibility\&.
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\fBParameters\fP
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\fIcolor\fP Pen color
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\fIstyle\fP Pen style
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pen(), brush()
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Definition at line 195 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::setSymbolPen (const QPen & pen)"
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.PP
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Set the symbol pen\&. The symbol pen is used for rendering the lines of the bar or candlestick symbols
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\fBSee also\fP
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\fBsymbolPen()\fP, \fBsetSymbolBrush()\fP
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Definition at line 209 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "void QwtPlotTradingCurve::setSymbolStyle (\fBSymbolStyle\fP style)"
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Set the symbol style
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.PP
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\fBParameters\fP
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.RS 4
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\fIstyle\fP Symbol style
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.RE
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\fBSee also\fP
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\fBsymbolStyle()\fP, \fBsetSymbolExtent()\fP, \fBsetSymbolPen()\fP, \fBsetSymbolBrush()\fP
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Definition at line 162 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "QBrush QwtPlotTradingCurve::symbolBrush (\fBDirection\fP direction) const"
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.PP
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\fBParameters\fP
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\fIdirection\fP
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\fBReturns\fP
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Brush used to fill the body of all candlestick symbols with the direction
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\fBSee also\fP
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Definition at line 262 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "double QwtPlotTradingCurve::symbolExtent () const"
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.PP
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\fBReturns\fP
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.RS 4
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Extent of a symbol in scale coordinates
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.RE
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\fBSee also\fP
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\fBsetSymbolExtent()\fP, \fBscaledSymbolWidth()\fP, \fBminSymbolWidth()\fP, \fBmaxSymbolWidth()\fP
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.RE
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.PP
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Definition at line 301 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "QPen QwtPlotTradingCurve::symbolPen () const"
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.PP
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\fBReturns\fP
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.RS 4
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Symbol pen
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.RE
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\fBSee also\fP
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\fBsetSymbolPen()\fP, \fBsymbolBrush()\fP
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Definition at line 224 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "\fBQwtPlotTradingCurve::SymbolStyle\fP QwtPlotTradingCurve::symbolStyle () const"
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.PP
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\fBReturns\fP
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.RS 4
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Symbol style
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.RE
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\fBSee also\fP
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\fBsetSymbolStyle()\fP, \fBsymbolExtent()\fP, \fBsymbolPen()\fP, \fBsymbolBrush()\fP
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Definition at line 177 of file qwt_plot_tradingcurve\&.cpp\&.
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.SS "bool QwtPlotTradingCurve::testPaintAttribute (\fBPaintAttribute\fP attribute) const"
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.PP
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\fBReturns\fP
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.RS 4
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True, when attribute is enabled
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\fBSee also\fP
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\fBPaintAttribute\fP, \fBsetPaintAttribute()\fP
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Definition at line 120 of file qwt_plot_tradingcurve\&.cpp\&.
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.SH "Author"
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.PP
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Generated automatically by Doxygen for Qwt User's Guide from the source code\&.
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