QwtPolarMagnifier Class Reference

QwtPolarMagnifier provides zooming, by magnifying in steps. More...

#include <qwt_polar_magnifier.h>

Inheritance diagram for QwtPolarMagnifier:

Public Member Functions
	QwtPolarMagnifier (QwtPolarCanvas *)
virtual	~QwtPolarMagnifier ()
	Destructor.
void	setUnzoomKey (int key, int modifiers)
void	getUnzoomKey (int &key, int &modifiers) const
QwtPolarPlot *	plot ()
const QwtPolarPlot *	plot () const
QwtPolarCanvas *	canvas ()
const QwtPolarCanvas *	canvas () const

Protected Member Functions
virtual void	rescale (double factor)
void	unzoom ()
	Unzoom the plot widget.
virtual void	widgetKeyPressEvent (QKeyEvent *)

Detailed Description

QwtPolarMagnifier provides zooming, by magnifying in steps.

Using QwtPlotMagnifier a plot can be zoomed in/out in steps using keys, the mouse wheel or moving a mouse button in vertical direction.

Together with QwtPolarPanner it is possible to implement an individual navigation of the plot canvas.

See Also

QwtPolarPanner, QwtPolarPlot, QwtPolarCanvas

Constructor & Destructor Documentation

QwtPolarMagnifier::QwtPolarMagnifier ( QwtPolarCanvas *  canvas )

explicit

Constructor

Parameters

canvas

Plot canvas to be magnified

Member Function Documentation

QwtPolarCanvas * QwtPolarMagnifier::canvas

(

)

Returns

Observed plot canvas

const QwtPolarCanvas * QwtPolarMagnifier::canvas

(

)

const

Returns

Observed plot canvas

void QwtPolarMagnifier::getUnzoomKey	(	int &	key,
		int &	modifiers
	)		const

Returns

Key, and modifiers that are used for unzooming

Parameters

key	Key code
modifiers	Modifiers

See Also

setUnzoomKey(), QwtPolarPlot::unzoom()

QwtPolarPlot * QwtPolarMagnifier::plot

(

)

Returns

Observed plot

const QwtPolarPlot * QwtPolarMagnifier::plot

(

)

const

Returns

observed plot

void QwtPolarMagnifier::rescale ( double  factor )

protectedvirtual

Zoom in/out the zoomed area

Parameters

factor

A value < 1.0 zooms in, a value > 1.0 zooms out.

void QwtPolarMagnifier::setUnzoomKey	(	int	key,
		int	modifiers
	)

Assign key and modifiers, that are used for unzooming The default combination is Qt::Key_Home + Qt::NoModifier.

Parameters

key	Key code
modifiers	Modifiers

See Also

getUnzoomKey(), QwtPolarPlot::unzoom()

void QwtPolarMagnifier::widgetKeyPressEvent ( QKeyEvent *  event )

protectedvirtual

Handle a key press event for the observed widget.

Parameters

event

Key event