QwtPolarMagnifier Class Reference

#include <qwt_polar_magnifier.h>

List of all members.

Public Member Functions
	QwtPolarMagnifier (QwtPolarCanvas *)
virtual	~QwtPolarMagnifier ()
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 ()
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

QwtPolarMagnifier::~QwtPolarMagnifier

(

)

[virtual]

Destructor.

---

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

)

[protected, virtual]

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::unzoom

(

)

[protected]

Unzoom the plot widget.

void QwtPolarMagnifier::widgetKeyPressEvent

(

QKeyEvent *

event

)

[protected, virtual]

Handle a key press event for the observed widget.

Parameters:

event

Key event