Qwt Polar User's Guide  0.1.0
Public Member Functions | Protected Member Functions | List of all members
QwtPolarMagnifier Class Reference

#include <qwt_polar_magnifier.h>

Public Member Functions

 QwtPolarMagnifier (QwtPolarCanvas *)
virtual ~QwtPolarMagnifier ()
void setUnzoomKey (int key, int modifiers)
void getUnzoomKey (int &key, int &modifiers) const
QwtPolarPlotplot ()
const QwtPolarPlotplot () const
QwtPolarCanvascanvas ()
const QwtPolarCanvascanvas () 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
canvasPlot canvas to be magnified
QwtPolarMagnifier::~QwtPolarMagnifier ( )
virtual

Destructor.

Member Function Documentation

QwtPolarCanvas * QwtPolarMagnifier::canvas ( )

Return 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
keyKey code
modifiersModifiers
See Also
setUnzoomKey(), QwtPolarPlot::unzoom()
QwtPolarPlot * QwtPolarMagnifier::plot ( )

Return observed plot.

const QwtPolarPlot * QwtPolarMagnifier::plot ( ) const

Return observed plot.

void QwtPolarMagnifier::rescale ( double  factor)
protectedvirtual

Zoom in/out the zoomed area

Parameters
factorA 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
keyKey code
modifiersModifiers
See Also
getUnzoomKey(), QwtPolarPlot::unzoom()
void QwtPolarMagnifier::unzoom ( )
protected

Unzoom the plot widget.

void QwtPolarMagnifier::widgetKeyPressEvent ( QKeyEvent *  ke)
protectedvirtual

Handle a key press event for the observed widget.

Parameters
keKey event