Provided by: libqwt-doc_6.0.0-1.2_all 
NAME
QwtPlotMarker -
A class for drawing markers.
SYNOPSIS
#include <qwt_plot_marker.h>
Inherits QwtPlotItem.
Public Types
enum LineStyle { NoLine, HLine, VLine, Cross }
Public Member Functions
QwtPlotMarker ()
virtual ~QwtPlotMarker ()
virtual int rtti () const
double xValue () const
double yValue () const
QPointF value () const
void setXValue (double)
void setYValue (double)
void setValue (double, double)
void setValue (const QPointF &)
void setLineStyle (LineStyle st)
LineStyle lineStyle () const
void setLinePen (const QPen &p)
const QPen & linePen () const
void setSymbol (const QwtSymbol *)
const QwtSymbol * symbol () const
void setLabel (const QwtText &)
QwtText label () const
void setLabelAlignment (Qt::Alignment)
Qt::Alignment labelAlignment () const
void setLabelOrientation (Qt::Orientation)
Qt::Orientation labelOrientation () const
void setSpacing (int)
int spacing () const
virtual void draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &) const
virtual QRectF boundingRect () const
virtual void updateLegend (QwtLegend *) const
virtual void drawLegendIdentifier (QPainter *, const QRectF &) const
Protected Member Functions
virtual void drawLines (QPainter *, const QRectF &, const QPointF &) const
virtual void drawLabel (QPainter *, const QRectF &, const QPointF &) const
Detailed Description
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 setLabel(), a label can be assigned to the marker. The 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 Qt::AlignLeft | Qt::AlignTop.
Member Enumeration Documentation
enum QwtPlotMarker::LineStyle Line styles.
See also:
setLineStyle(), lineStyle()
Enumerator:
NoLine No line.
HLine A horizontal line.
VLine A vertical line.
Cross A crosshair.
Constructor & Destructor Documentation
QwtPlotMarker::QwtPlotMarker () [explicit]
Sets alignment to Qt::AlignCenter, and style to QwtPlotMarker::NoLine.
QwtPlotMarker::~QwtPlotMarker () [virtual]
Destructor.
Member Function Documentation
QRectF QwtPlotMarker::boundingRect () const [virtual] Returns:
An invalid bounding rect: QRectF(1.0, 1.0, -2.0, -2.0)
Reimplemented from QwtPlotItem.
void QwtPlotMarker::draw (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF
&canvasRect) const [virtual] 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.
void QwtPlotMarker::drawLabel (QPainter *painter, const QRectF &canvasRect, const QPointF &pos) const
[protected, virtual] Align and draw the text label of the marker
Parameters:
painter Painter
canvasRect Contents rect of the canvas in painter coordinates
pos Position of the marker, translated into widget coordinates
See also:
drawLabel(), QwtSymbol::drawSymbol()
void QwtPlotMarker::drawLegendIdentifier (QPainter *painter, const QRectF &rect) const [virtual]
Draw the identifier representing the marker on the legend. Parameters:
painter Painter
rect Bounding rectangle for the identifier
See also:
updateLegend(), QwtPlotItem::Legend
Reimplemented from QwtLegendItemManager.
void QwtPlotMarker::drawLines (QPainter *painter, const QRectF &canvasRect, const QPointF &pos) const
[protected, virtual] Draw the lines marker
Parameters:
painter Painter
canvasRect Contents rect of the canvas in painter coordinates
pos Position of the marker, translated into widget coordinates
See also:
drawLabel(), QwtSymbol::drawSymbol()
QwtText QwtPlotMarker::label () const Returns:
the label
See also:
setLabel()
Qt::Alignment QwtPlotMarker::labelAlignment () const Returns:
the label alignment
See also:
setLabelAlignment(), setLabelOrientation()
Qt::Orientation QwtPlotMarker::labelOrientation () const Returns:
the label orientation
See also:
setLabelOrientation(), labelAlignment()
const QPen & QwtPlotMarker::linePen () const Returns:
the line pen
See also:
setLinePen()
QwtPlotMarker::LineStyle QwtPlotMarker::lineStyle () const Returns:
the line style
See also:
setLineStyle()
int QwtPlotMarker::rtti () const [virtual] Returns:
QwtPlotItem::Rtti_PlotMarker
Reimplemented from QwtPlotItem.
void QwtPlotMarker::setLabel (const QwtText &label)
Set the label. Parameters:
label label text
See also:
label()
void QwtPlotMarker::setLabelAlignment (Qt::Alignmentalign)
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.
See also:
labelAlignment(), labelOrientation()
void QwtPlotMarker::setLabelOrientation (Qt::Orientationorientation)
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()
void QwtPlotMarker::setLinePen (const QPen &pen) Specify a pen for the line.
Parameters:
pen New pen
See also:
linePen()
void QwtPlotMarker::setLineStyle (LineStylestyle)
Set the line style. Parameters:
style Line style.
See also:
lineStyle()
void QwtPlotMarker::setSpacing (intspacing)
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()
void QwtPlotMarker::setSymbol (const QwtSymbol *symbol)
Assign a symbol. Parameters:
symbol New symbol
See also:
symbol()
void QwtPlotMarker::setValue (const QPointF &pos)
Set Value.
void QwtPlotMarker::setValue (doublex, doubley)
Set Value.
void QwtPlotMarker::setXValue (doublex)
Set X Value.
void QwtPlotMarker::setYValue (doubley)
Set Y Value.
int QwtPlotMarker::spacing () const Returns:
the spacing
See also:
setSpacing()
const QwtSymbol * QwtPlotMarker::symbol () const Returns:
the symbol
See also:
setSymbol(), QwtSymbol
void QwtPlotMarker::updateLegend (QwtLegend *legend) const [virtual]
Update the widget that represents the item on the legend. Parameters:
legend Legend
See also:
drawLegendIdentifier(), legendItem(), itemChanged(), QwtLegend()
Note:
In the default setting QwtPlotItem::Legend is disabled
Reimplemented from QwtPlotItem.
QPointF QwtPlotMarker::value () const
Return Value.
double QwtPlotMarker::xValue () const
Return x Value.
double QwtPlotMarker::yValue () const
Return y Value.
Author
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