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

QwtCompass - A Compass Widget.

#include <qwt_compass.h>

Inherits QwtDial.


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


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 *)

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.

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.

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

Draw the contents of the scale

Parameters:

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

Reimplemented from QwtDial.

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.

Returns:

rose

See also:

setRose()

QwtCompassRose * QwtCompass::rose ()

Returns:

rose

See also:

setRose()

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()

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Wed Jan 2 2019 Version 6.1.4