QwtCanvasZoomer provides zooming for all axes of a plot canvas. More...

#include <qwt_plot_canvas_zoomer.h>

Inheritance diagram for QwtPlotCanvasZoomer:

Classes
class	PrivateData

Public Slots
virtual void	zoom (int offset)

virtual void	appendZoom (const QList< QwtPlotCanvasZoomState > &rect)

Public Slots inherited from QwtPicker
void	setEnabled (bool)
	En/disable the picker.

Signals
void	zoomed (const QList< QwtPlotCanvasZoomState > &state)
	A signal emitted when the plot has been zoomed in or out.

Signals inherited from QwtPicker
void	activated (bool on)
	A signal indicating, when the picker has been activated.

void	selected (const QPolygon &polygon)
	A signal emitting the selected points, at the end of a selection.

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

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

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

void	changed (const QPolygon &selection)
	A signal emitted when the active selection has been changed.

Public Member Functions
	QwtPlotCanvasZoomer (QWidget *canvas, bool doReplot=true)
	Create a zoomer for a plot canvas.

virtual void	setZoomBase (bool doReplot=true)

void	setAutoReplot (bool on=true)
	设置是否自动replot,默认为true

bool	isAutoReplot () const
	是否自动replot,默认为true

QList< QwtPlotCanvasZoomState >	zoomBase () const

QList< QwtPlotCanvasZoomState >	zoomState () const

void	setMaxStackDepth (int)

int	maxStackDepth () const

const QStack< QList< QwtPlotCanvasZoomState > > &	zoomStack () const

uint	zoomStateIndex () const

Public Member Functions inherited from QwtCanvasPicker
	QwtCanvasPicker (QWidget *canvas)

QwtPlot *	plot ()

const QwtPlot *	plot () const

QWidget *	canvas ()

const QWidget *	canvas () const

Public Member Functions inherited from QwtPicker
	QwtPicker (QWidget *parent)
	Constructor.

	QwtPicker (RubberBand rubberBand, DisplayMode trackerMode, QWidget *)
	Constructor.

virtual	~QwtPicker ()
	Destructor.

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

const QwtPickerMachine *	stateMachine () const

QwtPickerMachine *	stateMachine ()

void	setRubberBand (RubberBand)
	Set the rubber band style.

RubberBand	rubberBand () const

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

DisplayMode	trackerMode () const

void	setResizeMode (ResizeMode)
	Set the resize mode.

ResizeMode	resizeMode () const

void	setRubberBandPen (const QPen &)
	Set the pen for the rubberband.

QPen	rubberBandPen () const

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

QPen	trackerPen () const

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

QFont	trackerFont () const

bool	isEnabled () const

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

virtual bool	eventFilter (QObject , QEvent ) QWT_OVERRIDE
	Event filter.

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

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

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 QwtText	trackerText (const QPoint &pos) const
	Return the label for a position.

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)
	强制设置trackerPosition，正常这个不需要调用，但有时候没有鼠标也想显示picker可以通过此函数来设置

QPoint	trackerPosition () const

QPolygon	selection () const

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 mouse 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

const QVector< KeyPattern > &	keyPattern () const

QVector< MousePattern > &	mousePattern ()

QVector< KeyPattern > &	keyPattern ()

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 ()

virtual void	widgetMouseReleaseEvent (QMouseEvent *) QWT_OVERRIDE
	Handle a mouse release event for the observed widget.

virtual void	widgetKeyPressEvent (QKeyEvent *) QWT_OVERRIDE
	Handle a key press event for the observed widget.

virtual void	begin () QWT_OVERRIDE
	Open a selection setting the state to active.

virtual bool	end (bool ok=true) QWT_OVERRIDE
	Close a selection setting the state to inactive.

virtual bool	accept (QPolygon &) const QWT_OVERRIDE
	Validate and fix up 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	append (const QPoint &)
	Append a point to the selection and update rubber band and tracker.

virtual void	move (const QPoint &)
	Move the last point of the selection The moved() signal is emitted.

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

const QwtWidgetOverlay *	trackerOverlay () const

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 of an active selection 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

QwtCanvasZoomer provides zooming for all axes of a plot canvas.

QwtCanvasZoomer selects rectangles from user inputs (mouse or keyboard) and adjusts ALL axes of the plot simultaneously. Unlike QwtPlotZoomer which only works on two axes, this zoomer works on the entire canvas and maintains separate ranges for all four axes.

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 zoom state is pushed on a stack.

支持如下鼠标快捷键设置：

MouseSelect2，重置回基础
MouseSelect3，缩放栈回退
MouseSelect6，缩放栈前进

支持如下键盘快捷键设置：

KeyUndo，缩放栈回退
KeyRedo，缩放栈前进
KeyHome，重置回基础

See also: QwtPlotPanner, QwtPlotMagnifier

Constructor & Destructor Documentation

◆ QwtPlotCanvasZoomer()

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

explicit

Create a zoomer for a plot canvas.

The zoomer will zoom all axes of the plot simultaneously.

Parameters

canvas	Plot canvas to observe, also the parent object
doReplot	Call QwtPlot::replot() for the attached plot before initializing the zoomer with its scales.

Member Function Documentation

◆ accept()

bool QwtPlotCanvasZoomer::accept ( QPolygon & selection ) const

protectedvirtual

Validate and fix up the selection.

Accepts all selections unmodified

Parameters

selection Selection to validate and fix up

Returns: true, when accepted, false otherwise

Reimplemented from QwtPicker.

◆ begin()

void QwtPlotCanvasZoomer::begin ( )

protectedvirtual

Open a selection setting the state to active.

See also: isActive(), end(), append(), move()

Reimplemented from QwtPicker.

◆ end()

bool QwtPlotCanvasZoomer::end ( bool ok = true )

protectedvirtual

Close a selection setting the state to inactive.

The selection is validated and maybe fixed by accept().

Parameters

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

Returns: true if the selection is accepted, false otherwise

See also: isActive(), begin(), append(), move(), selected(), accept()

Reimplemented from QwtPicker.

◆ isAutoReplot()

bool QwtPlotCanvasZoomer::isAutoReplot ( ) const

是否自动replot,默认为true

Returns

◆ setAutoReplot()

void QwtPlotCanvasZoomer::setAutoReplot ( bool on = true )

设置是否自动replot,默认为true

Parameters

on

◆ widgetKeyPressEvent()

void QwtPlotCanvasZoomer::widgetKeyPressEvent ( QKeyEvent * keyEvent )

protectedvirtual

Handle a key press event for the observed widget.

Selections can be completely done by the keyboard. The arrow keys move the cursor, the abort key aborts a selection. All other keys are handled by the current state machine.

Parameters

keyEvent Key event

See also: eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyReleaseEvent(), stateMachine(), QwtEventPattern::KeyPatternCode

Reimplemented from QwtPicker.

◆ widgetMouseReleaseEvent()

void QwtPlotCanvasZoomer::widgetMouseReleaseEvent ( QMouseEvent * mouseEvent )

protectedvirtual

Handle a mouse release event for the observed widget.

Parameters

mouseEvent Mouse event

See also: eventFilter(), widgetMousePressEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

Reimplemented from QwtPicker.

◆ zoomed

void QwtPlotCanvasZoomer::zoomed ( const QList< QwtPlotCanvasZoomState > & state )

signal

A signal emitted when the plot has been zoomed in or out.

Parameters

state Current zoom state containing all axis ranges.

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

/home/runner/work/QWT/QWT/src/qwt_plot_canvas_zoomer.h
/home/runner/work/QWT/QWT/src/qwt_plot_canvas_zoomer.cpp

Classes

Public Slots

Signals

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QwtPlotCanvasZoomer()

Member Function Documentation

◆ accept()

◆ begin()

◆ end()

◆ isAutoReplot()

◆ setAutoReplot()

◆ widgetKeyPressEvent()

◆ widgetMouseReleaseEvent()

◆ zoomed