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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

QwtText QwtPlotMarker::label () const

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()

QwtPlotMarker::LineStyle QwtPlotMarker::lineStyle () const

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

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Tue Nov 20 2012 Version 5.2.3