Qwt User's Guide: QwtCompass Class Reference

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QwtCompass Class Reference

A Compass Widget. More...

#include <qwt_compass.h>

Inheritance diagram for QwtCompass:
[legend]

List of all members.

Public Member Functions

 QwtCompass (QWidget *parent=NULL)
virtual ~QwtCompass ()
void setRose (QwtCompassRose *rose)
const QwtCompassRose * rose () const
QwtCompassRose * rose ()
const QMap< double, QString > & labelMap () const
QMap< double, QString > & labelMap ()
void setLabelMap (const QMap< double, QString > &map)

Protected Member Functions

virtual QwtText scaleLabel (double value) const
virtual void drawRose (QPainter *, const QPoint &center, int radius, double north, QPalette::ColorGroup) const
virtual void drawScaleContents (QPainter *, const QPoint &center, int radius) const
virtual void keyPressEvent (QKeyEvent *)

Detailed Description

A Compass Widget.

QwtCompass is a widget to display and enter directions. It consists of a scale, an optional needle and rose.

dials1.png
Note:
The examples/dials example shows how to use QwtCompass.

Constructor & Destructor Documentation

QwtCompass::QwtCompass ( QWidget *  parent = NULL  )  [explicit]

Constructor.

Parameters:
parent Parent widget

Create a compass widget with a scale, no needle and no rose. The default origin is 270.0 with no valid value. It accepts mouse and keyboard inputs and has no step size. The default mode is QwtDial::RotateNeedle.

QwtCompass::~QwtCompass (  )  [virtual]

Destructor.

Member Function Documentation

void QwtCompass::drawRose ( QPainter *  painter,
const QPoint &  center,
int  radius,
double  north,
QPalette::ColorGroup  cg 
) const [protected, virtual]

Draw the compass rose

Parameters:
painter Painter
center Center of the compass
radius of the circle, where to paint the rose
north Direction pointing north, in degrees counter clockwise
cg Color group
void QwtCompass::drawScaleContents ( QPainter *  painter,
const QPoint &  center,
int  radius 
) const [protected, virtual]

Draw the contents of the scale

Parameters:
painter Painter
center Center of the content circle
radius Radius of the content circle

Reimplemented from QwtDial.

void QwtCompass::keyPressEvent ( QKeyEvent *  kev  )  [protected, virtual]

Handles key events

Beside the keys described in QwtDial::keyPressEvent numbers from 1-9 (without 5) set the direction according to their position on the num pad.

See also:
isReadOnly()

Reimplemented from QwtDial.

QMap< double, QString > & QwtCompass::labelMap (  ) 
Returns:
map, mapping values to labels
See also:
setLabelMap()
const QMap< double, QString > & QwtCompass::labelMap (  )  const
Returns:
map, mapping values to labels
See also:
setLabelMap()
QwtCompassRose * QwtCompass::rose (  ) 
Returns:
rose
See also:
setRose()
const QwtCompassRose * QwtCompass::rose (  )  const
Returns:
rose
See also:
setRose()
QwtText QwtCompass::scaleLabel ( double  value  )  const [protected, virtual]

Map a value to a corresponding label

Parameters:
value Value that will be mapped
Returns:
Label, or QString::null

label() looks in a map for a corresponding label for value or return an null text.

See also:
labelMap(), setLabelMap()

Reimplemented from QwtDial.

void QwtCompass::setLabelMap ( const QMap< double, QString > &  map  ) 

Set a map, mapping values to labels.

Parameters:
map value to label map

The values of the major ticks are found by looking into this map. The default map consists of the labels N, NE, E, SE, S, SW, W, NW.

Warning:
The map will have no effect for values that are no major tick values. Major ticks can be changed by QwtScaleDraw::setScale
See also:
labelMap(), scaleDraw(), setScale()
void QwtCompass::setRose ( QwtCompassRose *  rose  ) 

Set a rose for the compass

Parameters:
rose Compass rose
Warning:
The rose will be deleted, when a different rose is set or in ~QwtCompass
See also:
rose()
Generated on Wed Sep 2 18:37:23 2009 for Qwt User's Guide by  doxygen 1.6.1
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