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

#include <qwt_plot_axis_zoomer.h>

Inheritance diagram for QwtPlotAxisZoomer:

Classes
class	PrivateData

Public Slots
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 Slots inherited from QwtPicker
void	setEnabled (bool)
	Enable or disable the picker.

Signals
void	zoomed (const QRectF &rect)

Signals inherited from 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.

Signals inherited from 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 Member Functions
	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 Member Functions inherited from QwtPlotPicker
	QwtPlotPicker (QWidget *canvas)
	Constructor.

virtual	~QwtPlotPicker ()
	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 Member Functions inherited from 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 Member Functions inherited from 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 Member Functions
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 Member Functions inherited from 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 Member Functions inherited from 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 Member Functions inherited from 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.

Additional Inherited Members
Public Types inherited from QwtPicker
enum	RubberBand { NoRubberBand = 0 , HLineRubberBand , VLineRubberBand , CrossRubberBand , RectRubberBand , EllipseRubberBand , PolygonRubberBand , UserRubberBand = 100 }
	Rubber band style. More...

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

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

Public Types inherited from QwtEventPattern
enum	MousePatternCode { MouseSelect1 , MouseSelect2 , MouseSelect3 , MouseSelect4 , MouseSelect5 , MouseSelect6 , MousePatternCount }
	Symbolic mouse input codes. More...

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

Properties inherited from QwtPicker
bool	isEnabled

ResizeMode	resizeMode

DisplayMode	trackerMode

QPen	trackerPen

QFont	trackerFont

RubberBand	rubberBand

QPen	rubberBandPen

Detailed Description

QwtPlotAxisZoomer provides stacked zooming for a plot widget.

Constructor & Destructor Documentation

◆ QwtPlotAxisZoomer() [1/2]

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

explicit

Creates a zoomer for a plot canvas.

◆ 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.

Member Function Documentation

◆ 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.

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

Reimplemented from QwtPicker.

◆ begin()

void QwtPlotAxisZoomer::begin ( )

overrideprotectedvirtual

Begin selection.

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

See also: minZoomSize(), maxStackDepth()

Reimplemented from QwtPicker.

◆ end()

bool QwtPlotAxisZoomer::end ( bool ok = true )

overrideprotectedvirtual

End selection.

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

Parameters

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

See also: accept(), minZoomSize()

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

Reimplemented from QwtPlotPicker.

◆ maxStackDepth()

int QwtPlotAxisZoomer::maxStackDepth ( ) const

Returns the maximal depth of the zoom stack.

◆ minZoomSize()

QSizeF QwtPlotAxisZoomer::minZoomSize ( ) const

protectedvirtual

Get minimum zoom size.

Limit zooming by a minimum rectangle.

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

◆ moveBy

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

slot

Moves the current zoom rectangle by an offset.

◆ moveTo

void QwtPlotAxisZoomer::moveTo ( const QPointF & pos )

virtualslot

Moves the current zoom rectangle.

◆ rescale()

void QwtPlotAxisZoomer::rescale ( )

protectedvirtual

Rescale the plot.

Adjust the observed plot to zoomRect()

Note: Initiates QwtPlot::replot()

◆ setAxes()

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

overridevirtual

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

Reimplemented from QwtPlotPicker.

◆ setMaxStackDepth()

void QwtPlotAxisZoomer::setMaxStackDepth ( int depth )

Limits the number of recursive zoom operations to depth.

◆ setZoomBase() [1/2]

void QwtPlotAxisZoomer::setZoomBase ( bool doReplot = true )

virtual

Reinitializes the zoom stack with scaleRect() as base.

◆ setZoomBase() [2/2]

void QwtPlotAxisZoomer::setZoomBase ( const QRectF & base )

virtual

Sets the initial size of the zoomer.

◆ setZoomStack()

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

Assigns a zoom stack.

◆ 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.

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

Reimplemented from 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.

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

Reimplemented from QwtPicker.

◆ zoom [1/2]

void QwtPlotAxisZoomer::zoom ( const QRectF & rect )

virtualslot

Zooms in to a rectangle.

◆ zoom [2/2]

void QwtPlotAxisZoomer::zoom ( int offset )

virtualslot

Zooms in or out by an offset.

◆ zoomBase()

QRectF QwtPlotAxisZoomer::zoomBase ( ) const

Returns the initial rectangle of the zoomer.

◆ zoomed

void QwtPlotAxisZoomer::zoomed ( const QRectF & rect )

signal

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

Parameters

rect	Current zoom rectangle.

◆ zoomRect()

QRectF QwtPlotAxisZoomer::zoomRect ( ) const

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

◆ zoomRectIndex()

uint QwtPlotAxisZoomer::zoomRectIndex ( ) const

Returns the index of current position of zoom stack.

◆ zoomStack()

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

Returns the zoom stack.

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

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

Classes

Public Slots

Signals

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QwtPlotAxisZoomer() [1/2]

◆ QwtPlotAxisZoomer() [2/2]

Member Function Documentation

◆ 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()