Qwt User's Guide  6.1.3
QwtPlotMagnifier Class Reference

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

#include <qwt_plot_magnifier.h>

Inheritance diagram for QwtPlotMagnifier:

Public Member Functions

 QwtPlotMagnifier (QWidget *)
virtual ~QwtPlotMagnifier ()
void setAxisEnabled (int axis, bool on)
 En/Disable an axis. More...
bool isAxisEnabled (int axis) const
QWidget * canvas ()
 Return observed plot canvas.
const QWidget * canvas () const
 Return Observed plot canvas.
QwtPlotplot ()
 Return plot widget, containing the observed plot canvas.
const QwtPlotplot () const
 Return plot widget, containing the observed plot canvas.
- Public Member Functions inherited from QwtMagnifier
 QwtMagnifier (QWidget *)
virtual ~QwtMagnifier ()
QWidget * parentWidget ()
const QWidget * parentWidget () const
void setEnabled (bool)
 En/disable the magnifier. More...
bool isEnabled () const
void setMouseFactor (double)
 Change the mouse factor. More...
double mouseFactor () const
void setMouseButton (Qt::MouseButton, Qt::KeyboardModifiers=Qt::NoModifier)
void getMouseButton (Qt::MouseButton &, Qt::KeyboardModifiers &) const
void setWheelFactor (double)
 Change the wheel factor. More...
double wheelFactor () const
void setWheelModifiers (Qt::KeyboardModifiers)
Qt::KeyboardModifiers wheelModifiers () const
void setKeyFactor (double)
 Change the key factor. More...
double keyFactor () const
void setZoomInKey (int key, Qt::KeyboardModifiers=Qt::NoModifier)
void getZoomInKey (int &key, Qt::KeyboardModifiers &) const
 Retrieve the settings of the zoom in key. More...
void setZoomOutKey (int key, Qt::KeyboardModifiers=Qt::NoModifier)
void getZoomOutKey (int &key, Qt::KeyboardModifiers &) const
 Retrieve the settings of the zoom out key. More...
virtual bool eventFilter (QObject *, QEvent *)
 Event filter. More...

Protected Member Functions

virtual void rescale (double factor)
- Protected Member Functions inherited from QwtMagnifier
virtual void widgetMousePressEvent (QMouseEvent *)
virtual void widgetMouseReleaseEvent (QMouseEvent *)
virtual void widgetMouseMoveEvent (QMouseEvent *)
virtual void widgetWheelEvent (QWheelEvent *)
virtual void widgetKeyPressEvent (QKeyEvent *)
virtual void widgetKeyReleaseEvent (QKeyEvent *)

Detailed Description

QwtPlotMagnifier 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 QwtPlotZoomer and QwtPlotPanner it is possible to implement individual and powerful navigation of the plot canvas.

See also
QwtPlotZoomer, QwtPlotPanner, QwtPlot

Constructor & Destructor Documentation

QwtPlotMagnifier::QwtPlotMagnifier ( QWidget *  canvas)


canvasPlot canvas to be magnified

Member Function Documentation

bool QwtPlotMagnifier::isAxisEnabled ( int  axis) const

Test if an axis is enabled

axisAxis, see QwtPlot::Axis
True, if the axis is enabled
See also
void QwtPlotMagnifier::rescale ( double  factor)

Zoom in/out the axes scales

factorA value < 1.0 zooms in, a value > 1.0 zooms out.

Implements QwtMagnifier.

void QwtPlotMagnifier::setAxisEnabled ( int  axis,
bool  on 

En/Disable an axis.

Only Axes that are enabled will be zoomed. All other axes will remain unchanged.

axisAxis, see QwtPlot::Axis
See also