QwtPlotMagnifier Class Reference

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

#include <qwt_plot_magnifier.h>

Inheritance diagram for QwtPlotMagnifier:

Classes
class	PrivateData

Public Slots
virtual void	rescale (double factor) override

Public Member Functions
	QwtPlotMagnifier (QWidget *)
virtual	~QwtPlotMagnifier ()
void	setAxisEnabled (QwtAxisId, bool on)
bool	isAxisEnabled (QwtAxisId) const
QWidget *	canvas ()
const QWidget *	canvas () const
QwtPlot *	plot ()
const QwtPlot *	plot () const
Public Member Functions inherited from QwtMagnifier
	QwtMagnifier (QWidget *)
	Constructor.
virtual	~QwtMagnifier ()
	Destructor .
QWidget *	parentWidget ()
	Return the parent widget where the rescaling happens.
const QWidget *	parentWidget () const
	Return the parent widget where the rescaling happens.
void	setEnabled (bool)
	En/disable the magnifier.
bool	isEnabled () const
	Return whether the magnifier is enabled.
void	setMouseFactor (double)
	Change the mouse factor.
double	mouseFactor () const
	Return the mouse factor.
void	setMouseButton (Qt::MouseButton, Qt::KeyboardModifiers=Qt::NoModifier)
	Assign the mouse button that is used for zooming in/out.
void	getMouseButton (Qt::MouseButton &, Qt::KeyboardModifiers &) const
	Get the mouse button and modifiers used for zooming.
void	setWheelFactor (double)
	Change the wheel factor.
double	wheelFactor () const
	Return the wheel factor.
void	setWheelModifiers (Qt::KeyboardModifiers)
	Assign keyboard modifiers for zooming in/out using the wheel.
Qt::KeyboardModifiers	wheelModifiers () const
	Return the wheel modifiers.
void	setKeyFactor (double)
	Change the key factor.
double	keyFactor () const
	Return the key factor.
void	setZoomInKey (int key, Qt::KeyboardModifiers=Qt::NoModifier)
	Assign the key that is used for zooming in.
void	getZoomInKey (int &key, Qt::KeyboardModifiers &) const
	Retrieve the settings of the zoom in key.
void	setZoomOutKey (int key, Qt::KeyboardModifiers=Qt::NoModifier)
	Assign the key that is used for zooming out.
void	getZoomOutKey (int &key, Qt::KeyboardModifiers &) const
	Retrieve the settings of the zoom out key.
virtual bool	eventFilter (QObject *, QEvent *) override
	Event filter.

Additional Inherited Members
Protected Member Functions inherited from QwtMagnifier
virtual void	rescale (double factor)=0
	Rescale the parent widget.
virtual void	widgetMousePressEvent (QMouseEvent *)
	Handle a mouse press event for the observed widget.
virtual void	widgetMouseReleaseEvent (QMouseEvent *)
	Handle a mouse release event for the observed widget.
virtual void	widgetMouseMoveEvent (QMouseEvent *)
	Handle a mouse move event for the observed widget.
virtual void	widgetWheelEvent (QWheelEvent *)
	Handle a wheel event for the observed widget.
virtual void	widgetKeyPressEvent (QKeyEvent *)
	Handle a key press event for the observed widget.
virtual void	widgetKeyReleaseEvent (QKeyEvent *)
	Handle a key release event for the observed widget.

Detailed Description

QwtPlotMagnifier provides zooming, by magnifying in steps.

Constructor & Destructor Documentation

QwtPlotMagnifier()

QwtPlotMagnifier::QwtPlotMagnifier ( QWidget *  canvas )

explicit

Constructor

Parameters

canvas

Plot canvas to be magnified

Creates a magnifier attached to the given plot canvas. All axes are enabled by default.

~QwtPlotMagnifier()

QwtPlotMagnifier::~QwtPlotMagnifier ( )

virtual

Destructor

Member Function Documentation

canvas() [1/2]

QWidget * QwtPlotMagnifier::canvas

(

)

Return the observed plot canvas

Returns

Pointer to the canvas widget

canvas() [2/2]

const QWidget * QwtPlotMagnifier::canvas

(

)

const

Return the observed plot canvas (const version)

Returns

Const pointer to the canvas widget

isAxisEnabled()

bool QwtPlotMagnifier::isAxisEnabled

(

QwtAxisId

axisId

)

const

Check if an axis is enabled for magnification

Parameters

axisId

Axis identifier

Returns

true if the axis is enabled, false otherwise

See also

setAxisEnabled()

plot() [1/2]

QwtPlot * QwtPlotMagnifier::plot

(

)

Return the plot widget containing the observed canvas

Returns

Pointer to the QwtPlot widget, or nullptr if not found

plot() [2/2]

const QwtPlot * QwtPlotMagnifier::plot

(

)

const

Return the plot widget containing the observed canvas (const version)

Returns

Const pointer to the QwtPlot widget, or nullptr if not found

rescale

void QwtPlotMagnifier::rescale ( double  factor )

overridevirtualslot

Rescale the plot axes by the given factor

Parameters

factor

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

This method zooms in/out the axes scales by applying the given factor to all enabled axes. The zoom is centered around the current viewport center.

For parasite plots, this method does nothing.

The method handles all plots in the plot list, including parasite plots that share the same canvas area.

setAxisEnabled()

void QwtPlotMagnifier::setAxisEnabled	(	QwtAxisId	axisId,
		bool	on
	)

Enable or disable an axis for magnification

Parameters

axisId	Axis identifier
on	true to enable, false to disable

Only axes that are enabled will be zoomed when the magnifier is triggered. All other axes will remain unchanged.

All axes are enabled by default.

See also

isAxisEnabled()

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The documentation for this class was generated from the following files:

• /home/runner/work/QWT/QWT/src/plot/qwt_plot_magnifier.h
• /home/runner/work/QWT/QWT/src/plot/qwt_plot_magnifier.cpp