QwtPlotCanvasZoomer provides zooming for all axes of a plot canvas 更多...

#include <qwt_plot_canvas_zoomer.h>

类 QwtPlotCanvasZoomer 继承关系图:

类
class	PrivateData

Public 槽
virtual void	zoom (int offset)
	Navigate in the zoom stack by the specified offset

virtual void	appendZoom (const QList< QwtPlotCanvasZoomState > &rect)
	Append a new zoom state to the zoom stack

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

信号
void	zoomed (const QList< QwtPlotCanvasZoomState > &state)
	Signal emitted when the plot has been zoomed in or out

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
	QwtPlotCanvasZoomer (QWidget *canvas, bool doReplot=true)
	Constructor creating a zoomer for a plot canvas

virtual void	setZoomBase (bool doReplot=true)
	Set the zoom base to the current axis ranges

void	setAutoReplot (bool on=true)
	Enable or disable automatic replot after zoom operations

bool	isAutoReplot () const
	Check if automatic replot is enabled

QList< QwtPlotCanvasZoomState >	zoomBase () const
	Get the base zoom state (initial unzoomed state)

QList< QwtPlotCanvasZoomState >	zoomState () const
	Get the current zoom state

void	setMaxStackDepth (int)
	Set the maximum depth of the zoom stack

int	maxStackDepth () const
	Get the maximum depth of the zoom stack

const QStack< QList< QwtPlotCanvasZoomState > > &	zoomStack () const
	Get the zoom stack containing all zoom states

uint	zoomStateIndex () const

Public 成员函数继承自 QwtCanvasPicker
	QwtCanvasPicker (QWidget *canvas)
	Constructor with canvas widget

	~QwtCanvasPicker () override
	Destructor

QwtPlot *	plot ()
	Get the associated plot

const QwtPlot *	plot () const
	Get the associated plot (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 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)
	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 ()

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

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

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

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

virtual bool	accept (QPolygon &) const override
	Validate and fix up 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	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
	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

QwtPlotCanvasZoomer provides zooming for all axes of a plot canvas

QwtPlotCanvasZoomer 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.

Mouse shortcuts:

MouseSelect2: Reset to base
MouseSelect3: Zoom out (back)
MouseSelect6: Zoom in (forward)

Keyboard shortcuts:

KeyUndo: Zoom out (back)
KeyRedo: Zoom in (forward)
KeyHome: Reset to base

参见: QwtPlotPanner, QwtPlotMagnifier

构造及析构函数说明

◆ QwtPlotCanvasZoomer()

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

explicit

Constructor creating a zoomer for a plot canvas

参数

[in]	canvas	Plot canvas to observe, also the parent object
[in]	doReplot	If true, call QwtPlot::replot() before initializing

The zoomer will zoom all axes of the plot simultaneously. It uses a drag rectangle picker machine for selecting zoom regions. The tracker mode is set to ActiveOnly and the rubber band is set to RectRubberBand.

Destructor

成员函数说明

◆ accept()

bool QwtPlotCanvasZoomer::accept ( QPolygon & selection ) const

overrideprotectedvirtual

Validate and fix up the selection

Accepts all selections unmodified

参数

selection Selection to validate and fix up

返回: true, when accepted, false otherwise

重载 QwtPicker .

◆ appendZoom

void QwtPlotCanvasZoomer::appendZoom ( const QList< QwtPlotCanvasZoomState > & rect )

virtualslot

Append a new zoom state to the zoom stack

参数

[in] rect List of zoom states for all plots

This method adds a new zoom state to the stack and makes it the current state. The zoomed() signal is emitted after the zoom is applied.

◆ begin()

void QwtPlotCanvasZoomer::begin ( )

overrideprotectedvirtual

Open a selection setting the state to active

参见: isActive(), end(), append(), move()

重载 QwtPicker .

◆ end()

bool QwtPlotCanvasZoomer::end ( bool ok = true )

overrideprotectedvirtual

Close a selection setting the state to inactive.

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

参数

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

返回: true if the selection is accepted, false otherwise

参见: isActive(), begin(), append(), move(), selected(), accept()

重载 QwtPicker .

◆ isAutoReplot()

bool QwtPlotCanvasZoomer::isAutoReplot ( ) const

Check if automatic replot is enabled

返回: true if automatic replot is enabled

◆ maxStackDepth()

int QwtPlotCanvasZoomer::maxStackDepth ( ) const

Get the maximum depth of the zoom stack

返回: Maximum number of zoom levels, -1 means unlimited

◆ setAutoReplot()

void QwtPlotCanvasZoomer::setAutoReplot ( bool on = true )

Enable or disable automatic replot after zoom operations

参数

[in] on If true, the plot will be automatically replotted after zoom

When enabled, the plot will automatically replot after each zoom operation. This is enabled by default.

◆ setMaxStackDepth()

void QwtPlotCanvasZoomer::setMaxStackDepth ( int depth )

Set the maximum depth of the zoom stack

参数

[in] depth Maximum number of zoom levels, -1 for unlimited

When the stack exceeds this depth, older zoom states are removed. If the current zoom level is beyond the new limit, it will be adjusted.

◆ setZoomBase()

void QwtPlotCanvasZoomer::setZoomBase ( bool doReplot = true )

virtual

Set the zoom base to the current axis ranges

参数

[in] doReplot If true, call QwtPlot::replotAll() before capturing state

This method clears the zoom stack and sets the current view as the base state. It captures the axis ranges of the main plot and all parasite plots.

◆ widgetKeyPressEvent()

void QwtPlotCanvasZoomer::widgetKeyPressEvent ( QKeyEvent * keyEvent )

overrideprotectedvirtual

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.

参数

keyEvent Key event

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

重载 QwtPicker .

◆ widgetMouseReleaseEvent()

void QwtPlotCanvasZoomer::widgetMouseReleaseEvent ( QMouseEvent * mouseEvent )

overrideprotectedvirtual

Handle a mouse release event for the observed widget.

参数

mouseEvent Mouse event

参见: eventFilter(), widgetMousePressEvent(), widgetMouseDoubleClickEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent(), widgetKeyReleaseEvent()

重载 QwtPicker .

◆ zoom

void QwtPlotCanvasZoomer::zoom ( int offset )

virtualslot

Navigate in the zoom stack by the specified offset

参数

[in] offset Number of positions to move (negative = zoom out, positive = zoom in)

Moving by 0 resets to the base zoom level. The zoomed() signal is emitted if the zoom state changes.

◆ zoomBase()

QList< QwtPlotCanvasZoomState > QwtPlotCanvasZoomer::zoomBase ( ) const

Get the base zoom state (initial unzoomed state)

返回: List of zoom states for all plots at the base level

Returns an empty list if the zoom stack is empty.

◆ zoomed

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

signal

Signal emitted when the plot has been zoomed in or out

参数

state Current zoom state containing all axis ranges

◆ zoomStack()

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

Get the zoom stack containing all zoom states

返回: Const reference to the internal zoom stack

The stack contains the complete history of zoom operations, with index 0 being the base (unzoomed) state.

◆ zoomState()

QList< QwtPlotCanvasZoomState > QwtPlotCanvasZoomer::zoomState ( ) const

Get the current zoom state

返回: List of zoom states for all plots at the current zoom level

Returns an empty list if the zoom stack is empty.

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/plot/qwt_plot_canvas_zoomer.h
/home/runner/work/QWT/QWT/src/plot/qwt_plot_canvas_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

◆ QwtPlotCanvasZoomer()

成员函数说明

◆ accept()

◆ appendZoom

◆ begin()

◆ end()

◆ isAutoReplot()

◆ maxStackDepth()

◆ setAutoReplot()

◆ setMaxStackDepth()

◆ setZoomBase()

◆ widgetKeyPressEvent()

◆ widgetMouseReleaseEvent()

◆ zoom

◆ zoomBase()

◆ zoomed

◆ zoomStack()

◆ zoomState()