Qwt Polar User's Guide 1.0.0
Public Member Functions | Protected Member Functions

QwtPolarMagnifier Class Reference

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

#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
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 ( )
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:
keyKey code
modifiersModifiers
See also:
setUnzoomKey(), QwtPolarPlot::unzoom()
const QwtPolarPlot * QwtPolarMagnifier::plot ( ) const
Returns:
observed plot
QwtPolarPlot * QwtPolarMagnifier::plot ( )
Returns:
Observed plot
void QwtPolarMagnifier::rescale ( double  factor) [protected, virtual]

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 *  event) [protected, virtual]

Handle a key press event for the observed widget.

Parameters:
eventKey event