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QwtPlotMarker(3) Qwt User's Guide QwtPlotMarker(3)

QwtPlotMarker -

#include <qwt_plot_marker.h>
Inherits QwtPlotItem.


enum LineStyle { NoLine, HLine, VLine, Cross }
 


QwtPlotMarker ()
 
virtual ~QwtPlotMarker ()
 
virtual QwtDoubleRect boundingRect () const
 
virtual void draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &) const
 
QwtText label () const
 
Qt::Alignment labelAlignment () const
 
Qt::Orientation labelOrientation () const
 
const QPen & linePen () const
 
LineStyle lineStyle () const
 
virtual int rtti () const
 
void setLabel (const QwtText &)
 
void setLabelAlignment (Qt::Alignment)
 
void setLabelOrientation (Qt::Orientation)
 
void setLinePen (const QPen &p)
 
void setLineStyle (LineStyle st)
 
void setSpacing (int)
 
void setSymbol (const QwtSymbol &s)
 
void setValue (double, double)
 
void setValue (const QwtDoublePoint &)
 
void setXValue (double)
 
void setYValue (double)
 
int spacing () const
 
const QwtSymbol & symbol () const
 
QwtDoublePoint value () const
 
double xValue () const
 
double yValue () const
 


void drawAt (QPainter *, const QRect &, const QPoint &) const
 

A class for drawing markers.
A marker can be a horizontal line, a vertical line, a symbol, a label or any combination of them, which can be drawn around a center point inside a bounding rectangle.
The QwtPlotMarker::setSymbol() member assigns a symbol to the marker. The symbol is drawn at the specified point.
With QwtPlotMarker::setLabel(), a label can be assigned to the marker. The QwtPlotMarker::setLabelAlignment() member specifies where the label is drawn. All the Align*-constants in Qt::AlignmentFlags (see Qt documentation) are valid. The interpretation of the alignment depends on the marker's line style. The alignment refers to the center point of the marker, which means, for example, that the label would be printed left above the center point if the alignment was set to AlignLeft|AlignTop.

Line styles.
See also:
setLineStyle(), lineStyle()

Returns:
An invalid bounding rect: QwtDoubleRect(1.0, 1.0, -2.0, -2.0)
Reimplemented from QwtPlotItem.

Draw the marker
Parameters:
painter Painter
 
xMap x Scale Map
 
yMap y Scale Map
 
canvasRect Contents rect of the canvas in painter coordinates
Implements QwtPlotItem.

Draw the marker at a specific position
Parameters:
painter Painter
 
canvasRect Contents rect of the canvas in painter coordinates
 
pos Position of the marker in painter coordinates

Returns:
the label
See also:
setLabel()

Returns:
the label alignment
See also:
setLabelAlignment(), setLabelOrientation()

Returns:
the label orientation
See also:
setLabelOrientation(), labelAlignment()

Returns:
the line pen
See also:
setLinePen()

Returns:
the line style
See also:
For a description of line styles, see QwtPlotMarker::setLineStyle()

Returns:
QwtPlotItem::Rtti_PlotMarker
Reimplemented from QwtPlotItem.

Set the label. Parameters:
label label text
See also:
label()

Set the alignment of the label. In case of QwtPlotMarker::HLine the alignment is relative to the y position of the marker, but the horizontal flags correspond to the canvas rectangle. In case of QwtPlotMarker::VLine the alignment is relative to the x position of the marker, but the vertical flags correspond to the canvas rectangle.
In all other styles the alignment is relative to the marker's position.
Parameters:
align Alignment. A combination of AlignTop, AlignBottom, AlignLeft, AlignRight, AlignCenter, AlgnHCenter, AlignVCenter.
See also:
labelAlignment(), labelOrientation()

Set the orientation of the label. When orientation is Qt::Vertical the label is rotated by 90.0 degrees ( from bottom to top ).
Parameters:
orientation Orientation of the label
See also:
labelOrientation(), setLabelAlignment()

Specify a pen for the line.
The width of non cosmetic pens is scaled according to the resolution of the paint device.
Parameters:
pen New pen
See also:
linePen(), QwtPainter::scaledPen()

Set the line style. Parameters:
st Line style. Can be one of QwtPlotMarker::NoLine, HLine, VLine or Cross
See also:
lineStyle()

Set the spacing. When the label is not centered on the marker position, the spacing is the distance between the position and the label.
Parameters:
spacing Spacing
See also:
spacing(), setLabelAlignment()

Assign a symbol. Parameters:
s New symbol
See also:
symbol()

Returns:
the spacing
See also:
setSpacing()

Returns:
the symbol
See also:
setSymbol(), QwtSymbol

Generated automatically by Doxygen for Qwt User's Guide from the source code.
Tue Nov 20 2012 Version 5.2.3

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