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

NAME

QwtCompass -

SYNOPSIS

#include <qwt_compass.h>
Inherits QwtDial.

Public Member Functions


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

Protected Member Functions


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 *)
 
virtual QwtText scaleLabel (double value) const
 

Additional Inherited Members

Detailed Description

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

Member Function Documentation

void QwtCompass::drawRose (QPainter *painter, const QPoint &center, intradius, doublenorth, QPalette::ColorGroupcg) 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, intradius) 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.

const QMap< double, QString > & QwtCompass::labelMap () const

Returns:
map, mapping values to labels
See also:
setLabelMap()

QMap< double, QString > & QwtCompass::labelMap ()

Returns:
map, mapping values to labels
See also:
setLabelMap()

const QwtCompassRose * QwtCompass::rose () const

Returns:
rose
See also:
setRose()

QwtCompassRose * QwtCompass::rose ()

Returns:
rose
See also:
setRose()

QwtText QwtCompass::scaleLabel (doublevalue) 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()

Author

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Tue Nov 20 2012 Version 5.2.3