QwtPlotAxisZoomer provides stacked zooming for a plot widget 更多...

#include <qwt_plot_axis_zoomer.h>

类 QwtPlotAxisZoomer 继承关系图:

类
class	PrivateData

Public 槽
void	moveBy (double dx, double dy)
	Moves the current zoom rectangle by an offset.

virtual void	moveTo (const QPointF &)
	Moves the current zoom rectangle.

virtual void	zoom (const QRectF &)
	Zooms in to a rectangle.

virtual void	zoom (int offset)
	Zooms in or out by an offset.

Public 槽继承自 QwtPicker
void	setEnabled (bool)
	Enable or disable the picker

信号
void	zoomed (const QRectF &rect)

信号继承自 QwtPlotPicker
void	selected (const QPointF &pos)
	Signal emitted in case of QwtPickerMachine::PointSelection

void	selected (const QRectF &rect)
	Signal emitted in case of QwtPickerMachine::RectSelection

void	selected (const QVector< QPointF > &pa)
	Signal emitting the selected points at the end of a selection

void	appended (const QPointF &pos)
	Signal emitted when a point has been appended to the selection

void	moved (const QPointF &pos)
	Signal emitted whenever the last appended point of the selection has been moved

信号继承自 QwtPicker
void	activated (bool on)
	Signal indicating when the picker has been activated

void	selected (const QPolygon &polygon)
	Signal emitting the selected points at the end of a selection

void	appended (const QPoint &pos)
	Signal emitted when a point has been appended to the selection

void	moved (const QPoint &pos)
	Signal emitted whenever the last appended point of the selection has been moved

void	removed (const QPoint &pos)
	Signal emitted whenever the last appended point of the selection has been removed

void	changed (const QPolygon &selection)
	Signal emitted when the active selection has been changed

Public 成员函数
	QwtPlotAxisZoomer (QWidget *, bool doReplot=true)
	Creates a zoomer for a plot canvas.

	QwtPlotAxisZoomer (QwtAxisId xAxis, QwtAxisId yAxis, QWidget *, bool doReplot=true)
	Creates a zoomer for a plot canvas with specified axes.

virtual void	setZoomBase (bool doReplot=true)
	Reinitializes the zoom stack with scaleRect() as base.

virtual void	setZoomBase (const QRectF &)
	Sets the initial size of the zoomer.

QRectF	zoomBase () const
	Returns the initial rectangle of the zoomer.

QRectF	zoomRect () const
	Returns the rectangle at the current position on the zoom stack.

virtual void	setAxes (QwtAxisId xAxis, QwtAxisId yAxis) override
	Reinitializes the axes, and sets the zoom base to their scales.

void	setMaxStackDepth (int)
	Limits the number of recursive zoom operations to depth.

int	maxStackDepth () const
	Returns the maximal depth of the zoom stack.

const QStack< QRectF > &	zoomStack () const
	Returns the zoom stack.

void	setZoomStack (const QStack< QRectF > &, int zoomRectIndex=-1)
	Assigns a zoom stack.

uint	zoomRectIndex () const
	Returns the index of current position of zoom stack.

Public 成员函数继承自 QwtPlotPicker
	QwtPlotPicker (QWidget *canvas)
	Constructor

	~QwtPlotPicker () override
	Destructor

	QwtPlotPicker (QwtAxisId xAxisId, QwtAxisId yAxisId, QWidget *)
	Constructor with axes

	QwtPlotPicker (QwtAxisId xAxisId, QwtAxisId yAxisId, RubberBand rubberBand, DisplayMode trackerMode, QWidget *)
	Constructor with axes, rubber band and tracker mode

QwtAxisId	xAxis () const
	Get the x axis

QwtAxisId	yAxis () const
	Get the y axis

QwtPlot *	plot ()
	Get the plot widget

const QwtPlot *	plot () const
	Get the plot widget (const version)

QWidget *	canvas ()
	Get the canvas widget

const QWidget *	canvas () const
	Get the canvas widget (const version)

Public 成员函数继承自 QwtPicker
	QwtPicker (QWidget *parent)
	Constructor

	QwtPicker (RubberBand rubberBand, DisplayMode trackerMode, QWidget *)

void	setStateMachine (QwtPickerMachine *)
	Set a state machine and delete the previous one

const QwtPickerMachine *	stateMachine () const
	Return the assigned state machine (const)

QwtPickerMachine *	stateMachine ()
	Return the assigned state machine

void	setRubberBand (RubberBand)
	Set the rubber band style

RubberBand	rubberBand () const
	Return the rubber band style

void	setTrackerMode (DisplayMode)
	Set the display mode of the tracker

DisplayMode	trackerMode () const
	Return the tracker display mode

void	setResizeMode (ResizeMode)
	Set the resize mode

ResizeMode	resizeMode () const
	Return the resize mode

void	setRubberBandPen (const QPen &)
	Set the pen for the rubber band

QPen	rubberBandPen () const
	Return the rubber band pen

void	setTrackerPen (const QPen &)
	Set the pen for the tracker

QPen	trackerPen () const
	Return the tracker pen

void	setTrackerFont (const QFont &)
	Set the font for the tracker

QFont	trackerFont () const
	Return the tracker font

bool	isEnabled () const
	Return true when enabled, false otherwise

bool	isActive () const
	A picker is active between begin() and end()

virtual bool	eventFilter (QObject , QEvent ) override
	Event filter for handling events

QWidget *	parentWidget ()
	Return the parent widget, where the selection happens

const QWidget *	parentWidget () const
	Return the parent widget, where the selection happens (const)

virtual QPainterPath	pickArea () const
	Find the area of the observed widget, where selection might happen

virtual void	drawRubberBand (QPainter *) const
	Draw a rubber band, depending on rubberBand()

virtual void	drawTracker (QPainter *) const
	Draw the tracker

virtual QRegion	trackerMask () const
	Calculate the mask for the tracker overlay

virtual QRegion	rubberBandMask () const
	Calculate the mask for the rubber band overlay

virtual QRect	trackerRect (const QFont &) const
	Calculate the bounding rectangle for the tracker text from the current position of the tracker

virtual void	setTrackerPosition (const QPoint &pos)
	Set the tracker position manually

QPoint	trackerPosition () const
	Return the current position of the tracker

QPolygon	selection () const
	Return the selected points

void	update ()

void	setActive (bool on)

Public 成员函数继承自 QwtEventPattern
	QwtEventPattern ()
	Constructor

virtual	~QwtEventPattern ()
	Destructor

void	initMousePattern (int numButtons)
	Set default mouse patterns depending on the number of mouse buttons

void	initKeyPattern ()
	Set default key patterns

void	setMousePattern (MousePatternCode, Qt::MouseButton button, Qt::KeyboardModifiers=Qt::NoModifier)
	Change one mouse pattern

void	setKeyPattern (KeyPatternCode, int key, Qt::KeyboardModifiers modifiers=Qt::NoModifier)
	Change one key pattern

void	setMousePattern (const QVector< MousePattern > &)
	Change the mouse event patterns

void	setKeyPattern (const QVector< KeyPattern > &)
	Change the key event patterns

const QVector< MousePattern > &	mousePattern () const
	Return the mouse pattern vector

const QVector< KeyPattern > &	keyPattern () const
	Return the key pattern vector

QVector< MousePattern > &	mousePattern ()
	Return the mouse pattern vector

QVector< KeyPattern > &	keyPattern ()
	Return the key pattern vector

bool	mouseMatch (MousePatternCode, const QMouseEvent *) const
	Compare a mouse event with an event pattern

bool	keyMatch (KeyPatternCode, const QKeyEvent *) const
	Compare a key event with an event pattern

Protected 成员函数
virtual void	rescale ()
	Rescale the plot

virtual QSizeF	minZoomSize () const
	Get minimum zoom size

virtual void	widgetMouseReleaseEvent (QMouseEvent *) override
	Handle mouse release event

virtual void	widgetKeyPressEvent (QKeyEvent *) override
	Handle key press event

virtual void	begin () override
	Begin selection

virtual bool	end (bool ok=true) override
	End selection

virtual bool	accept (QPolygon &) const override
	Accept selection

Protected 成员函数继承自 QwtPlotPicker
QRectF	scaleRect () const
	Get the scale rectangle

QRectF	invTransform (const QRect &) const
	Inverse transform a rectangle

QRect	transform (const QRectF &) const
	Transform a rectangle

QPointF	invTransform (const QPoint &) const
	Inverse transform a point

QPoint	transform (const QPointF &) const
	Transform a point

virtual QwtText	trackerText (const QPoint &) const override
	Get the tracker text for a point

virtual QwtText	trackerTextF (const QPointF &) const
	Get the tracker text for a point (floating point)

virtual void	move (const QPoint &) override
	Move the selection

virtual void	append (const QPoint &) override
	Append a point to the selection

Protected 成员函数继承自 QwtPicker
virtual QPolygon	adjustedPoints (const QPolygon &) const
	Map the pickedPoints() into a selection()

virtual void	transition (const QEvent *)
	Passes an event to the state machine and executes the resulting commands.

virtual void	remove ()
	Remove the last point of the selection The removed() signal is emitted.

virtual void	reset ()
	Reset the state machine and terminate ( end(false) ) the selection

virtual void	widgetMousePressEvent (QMouseEvent *)
	Handle a mouse press event for the observed widget.

virtual void	widgetMouseDoubleClickEvent (QMouseEvent *)
	Handle mouse double click 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	widgetKeyReleaseEvent (QKeyEvent *)
	Handle a key release event for the observed widget.

virtual void	widgetEnterEvent (QEvent *)
	Handle a enter event for the observed widget.

virtual void	widgetLeaveEvent (QEvent *)
	Handle a leave event for the observed widget.

virtual void	stretchSelection (const QSize &oldSize, const QSize &newSize)
	Scale the selection by the ratios of oldSize and newSize The changed() signal is emitted.

virtual void	updateDisplay ()
	Update the state of rubber band and tracker label

const QwtWidgetOverlay *	rubberBandOverlay () const
	Return the overlay displaying the rubber band

const QwtWidgetOverlay *	trackerOverlay () const
	Return the overlay displaying the tracker text

const QPolygon &	pickedPoints () const
	Return the points that have been collected so far

Protected 成员函数继承自 QwtEventPattern
virtual bool	mouseMatch (const MousePattern &, const QMouseEvent *) const
	Compare a mouse event with an event pattern.

virtual bool	keyMatch (const KeyPattern &, const QKeyEvent *) const
	Compare a key event with an event pattern.

额外继承的成员函数
Public 类型继承自 QwtPicker
enum	RubberBand { NoRubberBand = 0 , HLineRubberBand , VLineRubberBand , CrossRubberBand , RectRubberBand , EllipseRubberBand , PolygonRubberBand , UserRubberBand = 100 }
	Rubber band style 更多...

enum	DisplayMode { AlwaysOff , AlwaysOn , ActiveOnly }
	Display mode 更多...

enum	ResizeMode { Stretch , KeepSize }
	Controls what to do with the selected points when the observed widget is resized 更多...

Public 类型继承自 QwtEventPattern
enum	MousePatternCode { MouseSelect1 , MouseSelect2 , MouseSelect3 , MouseSelect4 , MouseSelect5 , MouseSelect6 , MousePatternCount }
	Symbolic mouse input codes 更多...

enum	KeyPatternCode { KeySelect1 , KeySelect2 , KeyAbort , KeyLeft , KeyRight , KeyUp , KeyDown , KeyRedo , KeyUndo , KeyHome , KeyPatternCount }
	Symbolic keyboard input codes 更多...

属性继承自 QwtPicker
bool	isEnabled

ResizeMode	resizeMode

DisplayMode	trackerMode

QPen	trackerPen

QFont	trackerFont

RubberBand	rubberBand

QPen	rubberBandPen

详细描述

QwtPlotAxisZoomer provides stacked zooming for a plot widget

QwtPlotAxisZoomer selects rectangles from user inputs ( mouse or keyboard ) translates them into plot coordinates and adjusts the axes to them. The selection is supported by a rubber band and optionally by displaying the coordinates of the current mouse position.

Zooming can be repeated as often as possible, limited only by maxStackDepth() or minZoomSize(). Each rectangle is pushed on a stack.

The default setting how to select rectangles is a QwtPickerDragRectMachine with the following bindings:

QwtEventPattern::MouseSelect1 The first point of the zoom rectangle is selected by a mouse press, the second point from the position, where the mouse is released.
QwtEventPattern::KeySelect1 The first key press selects the first, the second key press selects the second point.
QwtEventPattern::KeyAbort Discard the selection in the state, where the first point is selected.

To traverse the zoom stack the following bindings are used:

QwtEventPattern::MouseSelect3, QwtEventPattern::KeyUndo Zoom out one position on the zoom stack
QwtEventPattern::MouseSelect6, QwtEventPattern::KeyRedo Zoom in one position on the zoom stack
QwtEventPattern::MouseSelect2, QwtEventPattern::KeyHome Zoom to the zoom base

The setKeyPattern() and setMousePattern() functions can be used to configure the zoomer actions. The following example shows, how to configure the 'I' and 'O' keys for zooming in and out one position on the zoom stack. The "Home" key is used to "unzoom" the plot.

zoomer = new QwtPlotAxisZoomer( plot );
zoomer->setKeyPattern( QwtEventPattern::KeyRedo, Qt::Key_I, Qt::ShiftModifier );
zoomer->setKeyPattern( QwtEventPattern::KeyUndo, Qt::Key_O, Qt::ShiftModifier );
zoomer->setKeyPattern( QwtEventPattern::KeyHome, Qt::Key_Home );

QwtPlotAxisZoomer is tailored for plots with one x and y axis, but it is allowed to attach a second QwtPlotAxisZoomer ( without rubber band and tracker ) for the other axes.

注解: The realtime example includes an derived zoomer class that adds scrollbars to the plot canvas.

参见: QwtPlotPanner, QwtPlotMagnifier

构造及析构函数说明

◆ QwtPlotAxisZoomer() [1/2]

QwtPlotAxisZoomer::QwtPlotAxisZoomer	(	QWidget *	canvas,
		bool	doReplot = `true`
	)

explicit

Creates a zoomer for a plot canvas.

The zoomer is set to those x- and y-axis of the parent plot of the canvas that are enabled. If both or no x-axis are enabled, the picker is set to QwtAxis::XBottom. If both or no y-axis are enabled, it is set to QwtAxis::YLeft.

The zoomer is initialized with a QwtPickerDragRectMachine, the tracker mode is set to QwtPicker::ActiveOnly and the rubber band is set to QwtPicker::RectRubberBand.

参数

[in]	canvas	Plot canvas to observe, also the parent object.
[in]	doReplot	Call QwtPlot::replot() for the attached plot before initializing the zoomer with its scales. This might be necessary, when the plot is in a state with pending scale changes.

参见: QwtPlot::autoReplot(), QwtPlot::replot(), setZoomBase()

◆ QwtPlotAxisZoomer() [2/2]

QwtPlotAxisZoomer::QwtPlotAxisZoomer	(	QwtAxisId	xAxisId,
		QwtAxisId	yAxisId,
		QWidget *	canvas,
		bool	doReplot = `true`
	)

explicit

Creates a zoomer for a plot canvas with specified axes.

The zoomer is initialized with a QwtPickerDragRectMachine, the tracker mode is set to QwtPicker::ActiveOnly and the rubber band is set to QwtPicker::RectRubberBand.

参数

[in]	xAxisId	X axis of the zoomer.
[in]	yAxisId	Y axis of the zoomer.
[in]	canvas	Plot canvas to observe, also the parent object.
[in]	doReplot	Call QwtPlot::replot() for the attached plot before initializing the zoomer with its scales. This might be necessary, when the plot is in a state with pending scale changes.

参见: QwtPlot::autoReplot(), QwtPlot::replot(), setZoomBase()

成员函数说明

◆ accept()

bool QwtPlotAxisZoomer::accept ( QPolygon & pa ) const

overrideprotectedvirtual

Accept selection

Check and correct a selected rectangle

Reject rectangles with a height or width < 2, otherwise expand the selected rectangle to a minimum size of 11x11 and accept it.

返回: true If the rectangle is accepted, or has been changed to an accepted one.

重载 QwtPicker .

◆ begin()

void QwtPlotAxisZoomer::begin ( )

overrideprotectedvirtual

Begin selection

Rejects selections, when the stack depth is too deep, or the zoomed rectangle is minZoomSize().

参见: minZoomSize(), maxStackDepth()

重载 QwtPicker .

◆ end()

bool QwtPlotAxisZoomer::end ( bool ok = true )

overrideprotectedvirtual

End selection

Expand the selected rectangle to minZoomSize() and zoom in if accepted.

参数

ok	If true, complete the selection and emit selected signals otherwise discard the selection.

参见: accept(), minZoomSize()

返回: True if the selection has been accepted, false otherwise

重载 QwtPlotPicker .

◆ maxStackDepth()

int QwtPlotAxisZoomer::maxStackDepth ( ) const

Returns the maximal depth of the zoom stack.

返回: Maximal depth of the zoom stack.

参见: setMaxStackDepth()

◆ minZoomSize()

QSizeF QwtPlotAxisZoomer::minZoomSize ( ) const

protectedvirtual

Get minimum zoom size

Limit zooming by a minimum rectangle

返回: zoomBase().width() / 10e4, zoomBase().height() / 10e4

◆ moveBy

void QwtPlotAxisZoomer::moveBy	(	double	dx,
		double	dy
	)

slot

Moves the current zoom rectangle by an offset.

参数

[in]	dx	X offset.
[in]	dy	Y offset.

注解: The changed rectangle is limited by the zoom base.

◆ moveTo

void QwtPlotAxisZoomer::moveTo ( const QPointF & pos )

virtualslot

Moves the current zoom rectangle.

参数

[in] pos New position.

参见: QRectF::moveTo()

注解: The changed rectangle is limited by the zoom base.

◆ rescale()

void QwtPlotAxisZoomer::rescale ( )

protectedvirtual

Rescale the plot

Adjust the observed plot to zoomRect()

注解: Initiates QwtPlot::replot()

◆ setAxes()

void QwtPlotAxisZoomer::setAxes	(	QwtAxisId	xAxisId,
		QwtAxisId	yAxisId
	)

overridevirtual

Reinitializes the axes, and sets the zoom base to their scales.

参数

[in]	xAxisId	X axis.
[in]	yAxisId	Y axis.

重载 QwtPlotPicker .

◆ setMaxStackDepth()

void QwtPlotAxisZoomer::setMaxStackDepth ( int depth )

Limits the number of recursive zoom operations to depth.

A value of -1 sets the depth to unlimited, 0 disables zooming. If the current zoom rectangle is below depth, the plot is unzoomed.

参数

[in] depth Maximum for the stack depth.

参见: maxStackDepth()

注解: depth doesn't include the zoom base, so zoomStack().count() might be maxStackDepth() + 1.

◆ setZoomBase() [1/2]

void QwtPlotAxisZoomer::setZoomBase ( bool doReplot = true )

virtual

Reinitializes the zoom stack with scaleRect() as base.

参数

[in] doReplot Call QwtPlot::replot() for the attached plot before initializing the zoomer with its scales. This might be necessary, when the plot is in a state with pending scale changes.

参见: zoomBase(), scaleRect(), QwtPlot::autoReplot(), QwtPlot::replot()

◆ setZoomBase() [2/2]

void QwtPlotAxisZoomer::setZoomBase ( const QRectF & base )

virtual

Sets the initial size of the zoomer.

base is united with the current scaleRect() and the zoom stack is reinitialized with it as zoom base. plot is zoomed to scaleRect().

参数

[in] base Zoom base rectangle.

参见: zoomBase(), scaleRect()

◆ setZoomStack()

void QwtPlotAxisZoomer::setZoomStack	(	const QStack< QRectF > &	zoomStack,
		int	zoomRectIndex = `-1`
	)

Assigns a zoom stack.

In combination with other types of navigation it might be useful to modify to manipulate the complete zoom stack.

参数

[in]	zoomStack	New zoom stack.
[in]	zoomRectIndex	Index of the current position of zoom stack. In case of -1 the current position is at the top of the stack.

注解: The zoomed signal might be emitted.

参见: zoomStack(), zoomRectIndex()

◆ widgetKeyPressEvent()

void QwtPlotAxisZoomer::widgetKeyPressEvent ( QKeyEvent * ke )

overrideprotectedvirtual

Handle key press event

Qt::Key_Plus zooms in, Qt::Key_Minus zooms out one position on the zoom stack, Qt::Key_Escape zooms out to the zoom base.

Changes the current position on the stack, but doesn't pop any rectangle.

注解: The keys codes can be changed, using QwtEventPattern::setKeyPattern: 3, 4, 5

重载 QwtPicker .

◆ widgetMouseReleaseEvent()

void QwtPlotAxisZoomer::widgetMouseReleaseEvent ( QMouseEvent * me )

overrideprotectedvirtual

Handle mouse release event

Qt::MidButton zooms out one position on the zoom stack, Qt::RightButton to the zoom base.

Changes the current position on the stack, but doesn't pop any rectangle.

注解: The mouse events can be changed, using QwtEventPattern::setMousePattern: 2, 1

重载 QwtPicker .

◆ zoom [1/2]

void QwtPlotAxisZoomer::zoom ( const QRectF & rect )

virtualslot

Zooms in to a rectangle.

Clears all rectangles above the current position of the zoom stack and pushes the normalized rectangle on it.

参数

[in] rect Rectangle to zoom to.

注解: If the maximal stack depth is reached, zoom is ignored.; The zoomed signal is emitted.

◆ zoom [2/2]

void QwtPlotAxisZoomer::zoom ( int offset )

virtualslot

Zooms in or out by an offset.

Activates a rectangle on the zoom stack with an offset relative to the current position. Negative values of offset will zoom out, positive zoom in. A value of 0 zooms out to the zoom base.

参数

[in] offset Offset relative to the current position of the zoom stack.

注解: The zoomed signal is emitted.

参见: zoomRectIndex()

◆ zoomBase()

QRectF QwtPlotAxisZoomer::zoomBase ( ) const

Returns the initial rectangle of the zoomer.

返回: Initial rectangle of the zoomer.

参见: setZoomBase(), zoomRect()

◆ zoomed

void QwtPlotAxisZoomer::zoomed ( const QRectF & rect )

signal

A signal emitting the zoomRect(), when the plot has been zoomed in or out.

参数

rect	Current zoom rectangle.

◆ zoomRect()

QRectF QwtPlotAxisZoomer::zoomRect ( ) const

Returns the rectangle at the current position on the zoom stack.

返回: Rectangle at the current position on the zoom stack.

参见: zoomRectIndex(), scaleRect()

◆ zoomRectIndex()

uint QwtPlotAxisZoomer::zoomRectIndex ( ) const

Returns the index of current position of zoom stack.

返回: Index of current position of zoom stack.

◆ zoomStack()

const QStack< QRectF > & QwtPlotAxisZoomer::zoomStack ( ) const

Returns the zoom stack.

返回: The zoom stack. zoomStack()[0] is the zoom base, zoomStack()[1] the first zoomed rectangle.

参见: setZoomStack(), zoomRectIndex()

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/plot/qwt_plot_axis_zoomer.h
/home/runner/work/QWT/QWT/src/plot/qwt_plot_axis_zoomer.cpp

类

Public 槽

信号

Public 成员函数

Protected 成员函数

额外继承的成员函数

详细描述

构造及析构函数说明

◆ QwtPlotAxisZoomer() [1/2]

◆ QwtPlotAxisZoomer() [2/2]

成员函数说明

◆ accept()

◆ begin()

◆ end()

◆ maxStackDepth()

◆ minZoomSize()

◆ moveBy

◆ moveTo

◆ rescale()

◆ setAxes()

◆ setMaxStackDepth()

◆ setZoomBase() [1/2]

◆ setZoomBase() [2/2]

◆ setZoomStack()

◆ widgetKeyPressEvent()

◆ widgetMouseReleaseEvent()

◆ zoom [1/2]

◆ zoom [2/2]

◆ zoomBase()

◆ zoomed

◆ zoomRect()

◆ zoomRectIndex()

◆ zoomStack()