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

QwtPolarMagnifier - QwtPolarMagnifier provides zooming, by magnifying in steps.

#include <qwt_polar_magnifier.h>

Inherits QwtMagnifier.


virtual void rescale (double factor) override
void unzoom ()
Unzoom the plot widget.


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


virtual void widgetKeyPressEvent (QKeyEvent *) override

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

Definition at line 30 of file qwt_polar_magnifier.h.

Constructor

Parameters

canvas Plot canvas to be magnified

Definition at line 34 of file qwt_polar_magnifier.cpp.

QwtPolarCanvas * QwtPolarMagnifier::canvas ()

Returns

Observed plot canvas

Definition at line 74 of file qwt_polar_magnifier.cpp.

const QwtPolarCanvas * QwtPolarMagnifier::canvas () const

Returns

Observed plot canvas

Definition at line 80 of file qwt_polar_magnifier.cpp.

Returns

Key, and modifiers that are used for unzooming

Parameters

key Key code
modifiers Modifiers

See also

setUnzoomKey(), QwtPolarPlot::unzoom()

Definition at line 67 of file qwt_polar_magnifier.cpp.

QwtPolarPlot * QwtPolarMagnifier::plot ()

Returns

Observed plot

Definition at line 86 of file qwt_polar_magnifier.cpp.

const QwtPolarPlot * QwtPolarMagnifier::plot () const

Returns

observed plot

Definition at line 96 of file qwt_polar_magnifier.cpp.

Zoom in/out the zoomed area

Parameters

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

Definition at line 129 of file qwt_polar_magnifier.cpp.

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()

Definition at line 54 of file qwt_polar_magnifier.cpp.

Handle a key press event for the observed widget.

Parameters

event Key event

Reimplemented from QwtMagnifier.

Definition at line 110 of file qwt_polar_magnifier.cpp.

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

Sun Jul 18 2021 Version 6.2.0