Qwt Polar User's Guide 1.1.1

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QwtPolarMagnifier Class Reference

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

`#include <qwt_polar_magnifier.h>`

Inheritance diagram for QwtPolarMagnifier:
[legend]

## 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 | ) |
| 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::widgetKeyPressEvent | ( | QKeyEvent * | event | ) |
| protected virtual

Handle a key press event for the observed widget.

Parameters

  event | Key event