Qwt Polar User's Guide  1.1.1
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QwtPolarMarker Class Reference

A class for drawing markers. More...

#include <qwt_polar_marker.h>

Inheritance diagram for QwtPolarMarker:
Inheritance graph
[legend]

Public Member Functions

 QwtPolarMarker ()
 Sets alignment to Qt::AlignCenter, and style to NoLine.
 
virtual ~QwtPolarMarker ()
 Destructor.
 
virtual int rtti () const
 
void setPosition (const QwtPointPolar &)
 Change the position of the marker.
 
QwtPointPolar position () const
 
void setSymbol (const QwtSymbol *s)
 Assign a symbol. More...
 
const QwtSymbol * symbol () const
 
void setLabel (const QwtText &)
 Set the label. More...
 
QwtText label () const
 
void setLabelAlignment (Qt::Alignment)
 Set the alignment of the label. More...
 
Qt::Alignment labelAlignment () const
 
virtual void draw (QPainter *painter, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, double radius, const QRectF &canvasRect) const
 
virtual QwtInterval boundingInterval (int scaleId) const
 
- Public Member Functions inherited from QwtPolarItem
 QwtPolarItem (const QwtText &title=QwtText())
 
virtual ~QwtPolarItem ()
 Destroy the QwtPolarItem.
 
void attach (QwtPolarPlot *plot)
 Attach the item to a plot. More...
 
void detach ()
 This method detaches a QwtPolarItem from the QwtPolarPlot it has been associated with. More...
 
QwtPolarPlotplot () const
 
void setTitle (const QString &title)
 
void setTitle (const QwtText &title)
 
const QwtText & title () const
 
void setItemAttribute (ItemAttribute, bool on=true)
 
bool testItemAttribute (ItemAttribute) const
 
void setRenderHint (RenderHint, bool on=true)
 
bool testRenderHint (RenderHint) const
 
void setRenderThreadCount (uint numThreads)
 
uint renderThreadCount () const
 
double z () const
 
void setZ (double z)
 Set the z value. More...
 
void show ()
 Show the item.
 
void hide ()
 Hide the item.
 
virtual void setVisible (bool)
 
bool isVisible () const
 
virtual void itemChanged ()
 
virtual void legendChanged ()
 
virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &, const QwtInterval &)
 Update the item to changes of the axes scale division. More...
 
virtual int marginHint () const
 
void setLegendIconSize (const QSize &)
 
QSize legendIconSize () const
 
virtual QList< QwtLegendData > legendData () const
 Return all information, that is needed to represent the item on the legend. More...
 
virtual QwtGraphic legendIcon (int index, const QSizeF &) const
 

Additional Inherited Members

- Public Types inherited from QwtPolarItem
enum  RttiValues {
  Rtti_PolarItem = 0, Rtti_PolarGrid, Rtti_PolarMarker, Rtti_PolarCurve,
  Rtti_PolarSpectrogram, Rtti_PolarUserItem = 1000
}
 Runtime type information. More...
 
enum  ItemAttribute { Legend = 0x01, AutoScale = 0x02 }
 Plot Item Attributes. More...
 
enum  RenderHint { RenderAntialiased = 0x01 }
 Render hints. More...
 
typedef QFlags< ItemAttributeItemAttributes
 Item attributes.
 
typedef QFlags< RenderHintRenderHints
 Item attributes.
 

Detailed Description

A class for drawing markers.

A marker can be a a symbol, a label or a combination of them, which can be drawn around a center point inside a bounding rectangle.

The 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 alignment refers to the center point of the marker, which means, for example, that the label would be painted left above the center point if the alignment was set to AlignLeft|AlignTop.

Member Function Documentation

QwtInterval QwtPolarMarker::boundingInterval ( int  scaleId) const
virtual

Interval, that is necessary to display the item This interval can be useful for operations like clipping or autoscaling

Parameters
scaleIdScale index
Returns
bounding interval ( == position )
See Also
position()

Reimplemented from QwtPolarItem.

void QwtPolarMarker::draw ( QPainter *  painter,
const QwtScaleMap &  azimuthMap,
const QwtScaleMap &  radialMap,
const QPointF &  pole,
double  radius,
const QRectF &  canvasRect 
) const
virtual

Draw the marker

Parameters
painterPainter
azimuthMapMaps azimuth values to values related to 0.0, M_2PI
radialMapMaps radius values into painter coordinates.
polePosition of the pole in painter coordinates
radiusRadius of the complete plot area in painter coordinates
canvasRectContents rect of the canvas in painter coordinates

Implements QwtPolarItem.

QwtText QwtPolarMarker::label ( ) const
Returns
the label
See Also
setLabel()
Qt::Alignment QwtPolarMarker::labelAlignment ( ) const
Returns
the label alignment
See Also
setLabelAlignment()
QwtPointPolar QwtPolarMarker::position ( ) const
Returns
Position of the marker
int QwtPolarMarker::rtti ( ) const
virtual
Returns
QwtPolarItem::Rtti_PlotMarker

Reimplemented from QwtPolarItem.

void QwtPolarMarker::setLabel ( const QwtText &  label)

Set the label.

Parameters
labellabel text
See Also
label()
void QwtPolarMarker::setLabelAlignment ( Qt::Alignment  align)

Set the alignment of the label.

The alignment determines where the label is drawn relative to the marker's position.

Parameters
alignAlignment. A combination of AlignTop, AlignBottom, AlignLeft, AlignRight, AlignCenter, AlgnHCenter, AlignVCenter.
See Also
labelAlignment()
void QwtPolarMarker::setSymbol ( const QwtSymbol *  symbol)

Assign a symbol.

Parameters
symbolNew symbol
See Also
symbol()
const QwtSymbol * QwtPolarMarker::symbol ( ) const
Returns
the symbol
See Also
setSymbol(), QwtSymbol