QwtPlotZoomer provides stacked zooming for a plot widget. Más...

#include <qwt_plot_zoomer.h>

Diagrama de herencias de QwtPlotZoomer

Clases
class	PrivateData
Slots públicos
void	moveBy (double x, double y)
virtual void	move (double x, double y)
virtual void	zoom (const QwtDoubleRect &)
	Zoom in.
virtual void	zoom (int up)
	Zoom in or out.
Señales
void	zoomed (const QwtDoubleRect &rect)
Métodos públicos
	QwtPlotZoomer (QwtPlotCanvas *, bool doReplot=true)
	Create a zoomer for a plot canvas.
	QwtPlotZoomer (int xAxis, int yAxis, QwtPlotCanvas *, bool doReplot=true)
	Create a zoomer for a plot canvas.
	QwtPlotZoomer (int xAxis, int yAxis, int selectionFlags, DisplayMode trackerMode, QwtPlotCanvas *, bool doReplot=true)
virtual	~QwtPlotZoomer ()
virtual void	setZoomBase (bool doReplot=true)
virtual void	setZoomBase (const QwtDoubleRect &)
	Set the initial size of the zoomer.
QwtDoubleRect	zoomBase () const
QwtDoubleRect	zoomRect () const
virtual void	setAxis (int xAxis, int yAxis)
void	setMaxStackDepth (int)
	Limit the number of recursive zoom operations to depth.
int	maxStackDepth () const
const QValueStack < QwtDoubleRect > &	zoomStack () const
void	setZoomStack (const QValueStack< QwtDoubleRect > &, int zoomRectIndex=-1)
	Assign a zoom stack.
uint	zoomRectIndex () const
virtual void	setSelectionFlags (int)
Métodos protegidos
virtual void	rescale ()
virtual QwtDoubleSize	minZoomSize () const
	Limit zooming by a minimum rectangle.
virtual void	widgetMouseReleaseEvent (QMouseEvent *)
virtual void	widgetKeyPressEvent (QKeyEvent *)
virtual void	begin ()
virtual bool	end (bool ok=true)
virtual bool	accept (QwtPolygon &) const
	Check and correct a selected rectangle.

Descripción detallada

QwtPlotZoomer provides stacked zooming for a plot widget.

QwtPlotZoomer offers rubberband selections on the plot canvas, translating the selected rectangles into plot coordinates and adjusting the axes to them. Zooming can repeated as often as possible, limited only by maxStackDepth() or minZoomSize(). Each rectangle is pushed on a stack.

Zoom rectangles can be selected depending on selectionFlags() using the mouse or keyboard (QwtEventPattern, QwtPickerMachine). QwtEventPattern::MouseSelect3/QwtEventPattern::KeyUndo, or QwtEventPattern::MouseSelect6/QwtEventPattern::KeyRedo walk up and down the zoom stack. QwtEventPattern::MouseSelect2 or QwtEventPattern::KeyHome unzoom to the initial size.

QwtPlotZoomer is tailored for plots with one x and y axis, but it is allowed to attach a second QwtPlotZoomer for the other axes.

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

Documentación del constructor y destructor

QwtPlotZoomer::QwtPlotZoomer	(	QwtPlotCanvas *	canvas,
		bool	doReplot = `true`
	)		`[explicit]`

Create 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 QwtPlot::xBottom. If both or no y-axis are enabled, it is set to QwtPlot::yLeft.

The selectionFlags() are set to QwtPicker::RectSelection & QwtPicker::ClickSelection, the tracker mode to QwtPicker::ActiveOnly.

Parámetros:

canvas	Plot canvas to observe, also the parent object
doReplot	Call 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.

Ver también:: QwtPlot::autoReplot(), QwtPlot::replot(), setZoomBase()

QwtPlotZoomer::QwtPlotZoomer	(	int	xAxis,
		int	yAxis,
		QwtPlotCanvas *	canvas,
		bool	doReplot = `true`
	)		`[explicit]`

Create a zoomer for a plot canvas.

The selectionFlags() are set to QwtPicker::RectSelection & QwtPicker::ClickSelection, the tracker mode to QwtPicker::ActiveOnly.

Parámetros:

xAxis	X axis of the zoomer
yAxis	Y axis of the zoomer
canvas	Plot canvas to observe, also the parent object
doReplot	Call 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.

Ver también:: QwtPlot::autoReplot(), QwtPlot::replot(), setZoomBase()

QwtPlotZoomer::QwtPlotZoomer	(	int	xAxis,
		int	yAxis,
		int	selectionFlags,
		DisplayMode	trackerMode,
		QwtPlotCanvas *	canvas,
		bool	doReplot = `true`
	)		`[explicit]`

Create a zoomer for a plot canvas.

Parámetros:

xAxis	X axis of the zoomer
yAxis	Y axis of the zoomer
selectionFlags	Or'd value of QwtPicker::RectSelectionType and QwtPicker::SelectionMode. QwtPicker::RectSelection will be auto added.
trackerMode	Tracker mode
canvas	Plot canvas to observe, also the parent object
doReplot	Call 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.

Ver también:: QwtPicker, QwtPicker::setSelectionFlags(), QwtPicker::setRubberBand(), QwtPicker::setTrackerMode; QwtPlot::autoReplot(), QwtPlot::replot(), setZoomBase()

QwtPlotZoomer::~QwtPlotZoomer ( ) [virtual]

Documentación de las funciones miembro

bool QwtPlotZoomer::accept ( QwtPolygon & pa ) const [protected, virtual]

Check and correct a selected rectangle.

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

Devuelve:: true If rect is accepted, or has been changed to a accepted rectangle.

Reimplementado de QwtPicker.

void QwtPlotZoomer::begin ( ) [protected, virtual]

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

Ver también:: minZoomSize(), maxStackDepth()

Reimplementado de QwtPicker.

bool QwtPlotZoomer::end ( bool ok = true ) [protected, virtual]

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

Ver también:: QwtPlotZoomer::accept()a, QwtPlotZoomer::minZoomSize()

Reimplementado de QwtPlotPicker.

int QwtPlotZoomer::maxStackDepth ( ) const

Devuelve:: Maximal depth of the zoom stack.

Ver también:: setMaxStackDepth()

QwtDoubleSize QwtPlotZoomer::minZoomSize ( ) const [protected, virtual]

Limit zooming by a minimum rectangle.

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

void QwtPlotZoomer::move	(	double	x,
		double	y
	)		`[virtual, slot]`

Move the the current zoom rectangle.

Parámetros:

x	X value
y	Y value

Ver también:: QwtDoubleRect::move

Nota:: The changed rectangle is limited by the zoom base

void QwtPlotZoomer::moveBy	(	double	dx,
		double	dy
	)		`[slot]`

Move the current zoom rectangle.

Parámetros:

dx	X offset
dy	Y offset

Nota:: The changed rectangle is limited by the zoom base

void QwtPlotZoomer::rescale ( ) [protected, virtual]

Adjust the observed plot to zoomRect()

Nota:: Initiates QwtPlot::replot

void QwtPlotZoomer::setAxis	(	int	xAxis,
		int	yAxis
	)		`[virtual]`

Reinitialize the axes, and set the zoom base to their scales.

Parámetros:

xAxis	X axis
yAxis	Y axis

Reimplementado de QwtPlotPicker.

void QwtPlotZoomer::setMaxStackDepth ( int depth )

Limit the number of recursive zoom operations to depth.

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

Parámetros:

depth Maximum for the stack depth

Ver también:: maxStackDepth()

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

void QwtPlotZoomer::setSelectionFlags ( int flags ) [virtual]

Set the selection flags

Parámetros:

flags Or'd value of QwtPicker::RectSelectionType and QwtPicker::SelectionMode. The default value is QwtPicker::RectSelection & QwtPicker::ClickSelection.

Ver también:: selectionFlags(), SelectionType, RectSelectionType, SelectionMode

Nota:: QwtPicker::RectSelection will be auto added.

Reimplementado de QwtPicker.

void QwtPlotZoomer::setZoomBase ( bool doReplot = true ) [virtual]

Reinitialized the zoom stack with scaleRect() as base.

Parámetros:

doReplot Call 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.

Ver también:: zoomBase(), scaleRect() QwtPlot::autoReplot(), QwtPlot::replot().

void QwtPlotZoomer::setZoomBase ( const QwtDoubleRect & base ) [virtual]

Set the initial size of the zoomer.

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

Parámetros:

base Zoom base

Ver también:: zoomBase(), scaleRect()

void QwtPlotZoomer::setZoomStack	(	const QValueStack< QwtDoubleRect > &	zoomStack,
		int	zoomRectIndex = `-1`
	)

Assign a zoom stack.

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

Parámetros:

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

Nota:: The zoomed signal might be emitted.

Ver también:: zoomStack(), zoomRectIndex()

void QwtPlotZoomer::widgetKeyPressEvent ( QKeyEvent * ke ) [protected, virtual]

Qt::Key_Plus zooms out, Qt::Key_Minus zooms in 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.

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

Reimplementado de QwtPicker.

void QwtPlotZoomer::widgetMouseReleaseEvent ( QMouseEvent * me ) [protected, virtual]

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.

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

Reimplementado de QwtPicker.

void QwtPlotZoomer::zoom ( int offset ) [virtual, slot]

Zoom in or out.

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

Parámetros:

offset Offset relative to the current position of the zoom stack.

Nota:: The zoomed signal is emitted.

Ver también:: zoomRectIndex()

void QwtPlotZoomer::zoom ( const QwtDoubleRect & rect ) [virtual, slot]

Zoom in.

Clears all rectangles above the current position of the zoom stack and pushs the intersection of zoomRect() and the normalized rect on it.

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

QwtDoubleRect QwtPlotZoomer::zoomBase ( ) const

Devuelve:: Initial rectangle of the zoomer

Ver también:: setZoomBase(), zoomRect()

void QwtPlotZoomer::zoomed ( const QwtDoubleRect & rect ) [signal]

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

Parámetros:

rect	Current zoom rectangle.

QwtDoubleRect QwtPlotZoomer::zoomRect ( ) const

Rectangle at the current position on the zoom stack.

Ver también:: zoomRectIndex(), scaleRect().

uint QwtPlotZoomer::zoomRectIndex ( ) const

Devuelve:: Index of current position of zoom stack.

const QwtZoomStack & QwtPlotZoomer::zoomStack ( ) const

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

Ver también:: setZoomStack(), zoomRectIndex()

La documentación para esta clase fue generada a partir de los siguientes ficheros:

src/qwt/src/qwt_plot_zoomer.h
src/qwt/src/qwt_plot_zoomer.cpp

Clases

Slots públicos

Señales

Métodos públicos

Métodos protegidos

Descripción detallada

Documentación del constructor y destructor

Documentación de las funciones miembro