QwtPlotMagnifier类 参考

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

#include <qwt_plot_magnifier.h>

类 QwtPlotMagnifier 继承关系图:

类
class	PrivateData

Public 槽
virtual void	rescale (double factor) override
	Rescale the plot axes by the given factor

Public 成员函数
	QwtPlotMagnifier (QWidget *)
	Constructor
void	setAxisEnabled (QwtAxisId, bool on)
	Enable or disable an axis for magnification
bool	isAxisEnabled (QwtAxisId) const
	Check if an axis is enabled for magnification
QWidget *	canvas ()
	Return the observed plot canvas
const QWidget *	canvas () const
	Return the observed plot canvas (const version)
QwtPlot *	plot ()
	Return the plot widget containing the observed canvas
const QwtPlot *	plot () const
	Return the plot widget containing the observed canvas (const version)
Public 成员函数 继承自 QwtMagnifier
	QwtMagnifier (QWidget *)
	Constructor
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

额外继承的成员函数
Protected 成员函数 继承自 QwtMagnifier
virtual void	rescale (double factor)=0
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.

详细描述

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.

参见

QwtPlotZoomer, QwtPlotPanner, QwtPlot

构造及析构函数说明

QwtPlotMagnifier()

QwtPlotMagnifier::QwtPlotMagnifier ( QWidget *  canvas )

explicit

Constructor

参数

canvas

Plot canvas to be magnified

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

Destructor

成员函数说明

canvas() [1/2]

QWidget * QwtPlotMagnifier::canvas

(

)

Return the observed plot canvas

返回

Pointer to the canvas widget

canvas() [2/2]

const QWidget * QwtPlotMagnifier::canvas

(

)

const

Return the observed plot canvas (const version)

返回

Const pointer to the canvas widget

isAxisEnabled()

bool QwtPlotMagnifier::isAxisEnabled

(

QwtAxisId

axisId

)

const

Check if an axis is enabled for magnification

参数

axisId

Axis identifier

返回

true if the axis is enabled, false otherwise

参见

setAxisEnabled()

plot() [1/2]

QwtPlot * QwtPlotMagnifier::plot

(

)

Return the plot widget containing the observed canvas

返回

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)

返回

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

参数

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

参数

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.

参见

isAxisEnabled()

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该类的文档由以下文件生成:

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