QwtCompass - Man Page

A Compass Widget.

Synopsis

#include <qwt_compass.h>

Inherits QwtDial.

Public Member Functions

QwtCompass (QWidget *parent=NULL)
Constructor.
virtual ~QwtCompass ()
Destructor.
void setRose (QwtCompassRose *rose)
const QwtCompassRose * rose () const
QwtCompassRose * rose ()

Protected Member Functions

virtual void drawRose (QPainter *, const QPointF &center, double radius, double north, QPalette::ColorGroup) const
virtual void drawScaleContents (QPainter *, const QPointF &center, double radius) const
virtual void keyPressEvent (QKeyEvent *)

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 QPointF & center, double 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 QPointF & center, double 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 QwtAbstractSlider.

QwtCompassRose * QwtCompass::rose ()

Returns

rose

See also

setRose()

const QwtCompassRose * QwtCompass::rose () const

Returns

rose

See also

setRose()

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

Generated automatically by Doxygen for Qwt User's Guide from the source code.

Info

Mon Jun 1 2020 Version 6.1.5 Qwt User's Guide