#include <qwt_plot_magnifier.h>

Inherits QwtMagnifier.

Public Member Functions
QwtPlotCanvas *	canvas ()
const QwtPlotCanvas *	canvas () const
virtual bool	eventFilter (QObject , QEvent )
void	getMouseButton (int &button, int &buttonState) const
void	getZoomInKey (int &key, int &modifiers) const
void	getZoomOutKey (int &key, int &modifiers) const
bool	isAxisEnabled (int axis) const
bool	isEnabled () const
double	keyFactor () const
double	mouseFactor () const
QWidget *	parentWidget ()
const QWidget *	parentWidget () const
QwtPlot *	plot ()
const QwtPlot *	plot () const
	QwtPlotMagnifier (QwtPlotCanvas *)
void	setAxisEnabled (int axis, bool on)
void	setEnabled (bool)
void	setKeyFactor (double)
void	setMouseButton (int button, int buttonState=Qt::NoButton)
void	setMouseFactor (double)
void	setWheelButtonState (int buttonState)
void	setWheelFactor (double)
void	setZoomInKey (int key, int modifiers)
void	setZoomOutKey (int key, int modifiers)
int	wheelButtonState () const
double	wheelFactor () const
virtual	~QwtPlotMagnifier ()
Protected Member Functions
virtual void	rescale (double factor)
virtual void	widgetKeyPressEvent (QKeyEvent *)
virtual void	widgetKeyReleaseEvent (QKeyEvent *)
virtual void	widgetMouseMoveEvent (QMouseEvent *)
virtual void	widgetMousePressEvent (QMouseEvent *)
virtual void	widgetMouseReleaseEvent (QMouseEvent *)
virtual void	widgetWheelEvent (QWheelEvent *)

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 ( QwtPlotCanvas * canvas ) [explicit]

Constructor

Parameters:

canvas Plot canvas to be magnified

QwtPlotMagnifier::~QwtPlotMagnifier ( ) [virtual]

Destructor.

Member Function Documentation

QwtPlotCanvas * QwtPlotMagnifier::canvas ( )

Return observed plot canvas.

const QwtPlotCanvas * QwtPlotMagnifier::canvas ( ) const

Return Observed plot canvas.

bool QwtMagnifier::eventFilter	(	QObject *	object,
		QEvent *	event
	)		`[virtual, inherited]`

Event filter.

When isEnabled() the mouse events of the observed widget are filtered.

Parameters:

object	Object to be filtered
event	Event

See also:: widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent() widgetKeyReleaseEvent()

void QwtMagnifier::getMouseButton	(	int &	button,
		int &	buttonState
	)		const `[inherited]`

See also:: setMouseButton()

void QwtMagnifier::getZoomInKey	(	int &	key,
		int &	modifiers
	)		const `[inherited]`

See also:: setZoomInKey()

void QwtMagnifier::getZoomOutKey	(	int &	key,
		int &	modifiers
	)		const `[inherited]`

See also:: setZoomOutKey()

bool QwtPlotMagnifier::isAxisEnabled ( int axis ) const

Test if an axis is enabled

Parameters:

axis	Axis, see QwtPlot::Axis

Returns:: True, if the axis is enabled

See also:: setAxisEnabled()

bool QwtMagnifier::isEnabled ( ) const [inherited]

Returns:: true when enabled, false otherwise

See also:: setEnabled(), eventFilter()

double QwtMagnifier::keyFactor ( ) const [inherited]

Returns:: Key factor

See also:: setKeyFactor()

double QwtMagnifier::mouseFactor ( ) const [inherited]

Returns:: Mouse factor

See also:: setMouseFactor()

QWidget * QwtMagnifier::parentWidget ( ) [inherited]

Returns:: Parent widget, where the rescaling happens

const QWidget * QwtMagnifier::parentWidget ( ) const [inherited]

Returns:: Parent widget, where the rescaling happens

QwtPlot * QwtPlotMagnifier::plot ( )

Return plot widget, containing the observed plot canvas.

const QwtPlot * QwtPlotMagnifier::plot ( ) const

Return plot widget, containing the observed plot canvas.

void QwtPlotMagnifier::rescale ( double factor ) [protected, virtual]

Zoom in/out the axes scales

Parameters:

factor A 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.

Parameters:

axis	Axis, see QwtPlot::Axis
on	On/Off

See also:: isAxisEnabled()

void QwtMagnifier::setEnabled ( bool on ) [inherited]

En/disable the magnifier.

When enabled is true an event filter is installed for the observed widget, otherwise the event filter is removed.

Parameters:

on	true or false

See also:: isEnabled(), eventFilter()

void QwtMagnifier::setKeyFactor ( double factor ) [inherited]

Change the key factor.

The key factor defines the ratio between the current range on the parent widget and the zoomed range for each key press of the zoom in/out keys. The default value is 0.9.

Parameters:

factor Key factor

See also:: keyFactor(), setZoomInKey(), setZoomOutKey(), setWheelFactor, setMouseFactor()

void QwtMagnifier::setMouseButton	(	int	button,
		int	buttonState = `Qt::NoButton`
	)		`[inherited]`

Assign the mouse button, that is used for zooming in/out. The default value is Qt::RightButton.

Parameters:

button	Button
buttonState	Button state

See also:: getMouseButton()

void QwtMagnifier::setMouseFactor ( double factor ) [inherited]

Change the mouse factor.

The mouse factor defines the ratio between the current range on the parent widget and the zoomed range for each vertical mouse movement. The default value is 0.95.

Parameters:

factor Wheel factor

See also:: mouseFactor(), setMouseButton(), setWheelFactor(), setKeyFactor()

void QwtMagnifier::setWheelButtonState ( int buttonState ) [inherited]

Assign a mandatory button state for zooming in/out using the wheel. The default button state is Qt::NoButton.

Parameters:

buttonState Button state

See also:: wheelButtonState()

void QwtMagnifier::setWheelFactor ( double factor ) [inherited]

Change the wheel factor.

The wheel factor defines the ratio between the current range on the parent widget and the zoomed range for each step of the wheel. The default value is 0.9.

Parameters:

factor Wheel factor

See also:: wheelFactor(), setWheelButtonState(), setMouseFactor(), setKeyFactor()

void QwtMagnifier::setZoomInKey	(	int	key,
		int	modifiers
	)		`[inherited]`

Assign the key, that is used for zooming in. The default combination is Qt::Key_Plus + Qt::NoModifier.

Parameters:

key
modifiers

See also:: getZoomInKey(), setZoomOutKey()

void QwtMagnifier::setZoomOutKey	(	int	key,
		int	modifiers
	)		`[inherited]`

Assign the key, that is used for zooming out. The default combination is Qt::Key_Minus + Qt::NoModifier.

Parameters:

key
modifiers

See also:: getZoomOutKey(), setZoomOutKey()

int QwtMagnifier::wheelButtonState ( ) const [inherited]

Returns:: Wheel button state

See also:: setWheelButtonState()

double QwtMagnifier::wheelFactor ( ) const [inherited]

Returns:: Wheel factor

See also:: setWheelFactor()

void QwtMagnifier::widgetKeyPressEvent ( QKeyEvent * keyEvent ) [protected, virtual, inherited]

Handle a key press event for the observed widget.

Parameters:

keyEvent Key event

See also:: eventFilter(), widgetKeyReleaseEvent()

void QwtMagnifier::widgetKeyReleaseEvent ( QKeyEvent * keyEvent ) [protected, virtual, inherited]

Handle a key release event for the observed widget.

Parameters:

keyEvent Key event

See also:: eventFilter(), widgetKeyReleaseEvent()

void QwtMagnifier::widgetMouseMoveEvent ( QMouseEvent * mouseEvent ) [protected, virtual, inherited]

Handle a mouse move event for the observed widget.

Parameters:

mouseEvent Mouse event

See also:: eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(),

void QwtMagnifier::widgetMousePressEvent ( QMouseEvent * mouseEvent ) [protected, virtual, inherited]

Handle a mouse press event for the observed widget.

Parameters:

mouseEvent Mouse event

See also:: eventFilter(), widgetMouseReleaseEvent(), widgetMouseMoveEvent()

void QwtMagnifier::widgetMouseReleaseEvent ( QMouseEvent * mouseEvent ) [protected, virtual, inherited]

Handle a mouse release event for the observed widget.

Parameters:

mouseEvent Mouse event

See also:: eventFilter(), widgetMousePressEvent(), widgetMouseMoveEvent(),

void QwtMagnifier::widgetWheelEvent ( QWheelEvent * wheelEvent ) [protected, virtual, inherited]

Handle a wheel event for the observed widget.

Parameters:

wheelEvent Wheel event

See also:: eventFilter()

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation