Referencia de la Clase QwtPlotCanvas

#include <qwt_plot_canvas.h>

Diagrama de herencias de QwtPlotCanvas

Lista de todos los miembros.

Clases
class	PrivateData
Tipos públicos
enum	PaintAttribute { PaintCached = 1, PaintPacked = 2 }
	Paint attributes. Más...
enum	FocusIndicator { NoFocusIndicator, CanvasFocusIndicator, ItemFocusIndicator }
	Focus indicator. Más...
Métodos públicos
	QwtPlotCanvas (QwtPlot *)
	Sets a cross cursor, enables QwtPlotCanvas::PaintCached.
virtual	~QwtPlotCanvas ()
	Destructor.
QwtPlot *	plot ()
	Return parent plot widget.
const QwtPlot *	plot () const
	Return parent plot widget.
void	setFocusIndicator (FocusIndicator)
FocusIndicator	focusIndicator () const
void	setPaintAttribute (PaintAttribute, bool on=true)
	Changing the paint attributes.
bool	testPaintAttribute (PaintAttribute) const
QPixmap *	paintCache ()
	Return the paint cache, might be null.
const QPixmap *	paintCache () const
	Return the paint cache, might be null.
void	invalidatePaintCache ()
	Invalidate the internal paint cache.
Métodos protegidos
virtual void	hideEvent (QHideEvent *)
virtual void	paintEvent (QPaintEvent *)
	Paint event.
virtual void	drawContents (QPainter *)
	Redraw the canvas, and focus rect.
virtual void	drawFocusIndicator (QPainter *)
	Draw the focus indication.
void	drawCanvas (QPainter *painter=NULL)

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Descripción detallada

Canvas of a QwtPlot.

Ver también:

QwtPlot

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Documentación de las enumeraciones miembro de la clase

enum QwtPlotCanvas::FocusIndicator

Focus indicator.

• NoFocusIndicator
  Don't paint a focus indicator

• CanvasFocusIndicator
  The focus is related to the complete canvas. Paint the focus indicator using paintFocus()

• ItemFocusIndicator
  The focus is related to an item (curve, point, ...) on the canvas. It is up to the application to display a focus indication using f.e. highlighting.

Ver también:

setFocusIndicator(), focusIndicator(), paintFocus()

Valores de enumeraciones:

NoFocusIndicator
CanvasFocusIndicator
ItemFocusIndicator

enum QwtPlotCanvas::PaintAttribute

Paint attributes.

• PaintCached
  Paint double buffered and reuse the content of the pixmap buffer for some spontaneous repaints that happen when a plot gets unhidden, deiconified or changes the focus. Disabling the cache will improve the performance for incremental paints (using QwtPlotCurve::draw).

• PaintPacked
  Suppress system background repaints and paint it together with the canvas contents. Painting packed might avoid flickering for expensive repaints, when there is a notable gap between painting the background and the plot contents.

The default setting enables PaintCached and PaintPacked

Ver también:

setPaintAttribute(), testPaintAttribute(), paintCache()

Valores de enumeraciones:

PaintCached
PaintPacked

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Documentación del constructor y destructor

QwtPlotCanvas::QwtPlotCanvas

(

QwtPlot *

plot

)

[explicit]

Sets a cross cursor, enables QwtPlotCanvas::PaintCached.

QwtPlotCanvas::~QwtPlotCanvas

(

)

[virtual]

Destructor.

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Documentación de las funciones miembro

void QwtPlotCanvas::drawCanvas

(

QPainter *

painter = NULL

)

[protected]

Draw the the canvas

Paints all plot items to the contentsRect(), using QwtPlot::drawCanvas and updates the paint cache.

Ver también:

QwtPlot::drawCanvas, setPaintAttributes(), testPaintAttributes()

void QwtPlotCanvas::drawContents

(

QPainter *

painter

)

[protected, virtual]

Redraw the canvas, and focus rect.

Reimplementado de QFrame.

void QwtPlotCanvas::drawFocusIndicator

(

QPainter *

painter

)

[protected, virtual]

Draw the focus indication.

QwtPlotCanvas::FocusIndicator QwtPlotCanvas::focusIndicator

(

)

const

Devuelve:

Focus indicator

Ver también:

FocusIndicator, setFocusIndicator

void QwtPlotCanvas::hideEvent

(

QHideEvent *

)

[protected, virtual]

This event handler can be reimplemented in a subclass to receive widget hide events.

Hide events are sent to widgets immediately after they have been hidden.

Ver también:

event(), QHideEvent

Reimplementado de QWidget.

void QwtPlotCanvas::invalidatePaintCache

(

)

Invalidate the internal paint cache.

const QPixmap * QwtPlotCanvas::paintCache

(

)

const

Return the paint cache, might be null.

QPixmap * QwtPlotCanvas::paintCache

(

)

Return the paint cache, might be null.

void QwtPlotCanvas::paintEvent

(

QPaintEvent *

event

)

[protected, virtual]

Paint event.

Reimplementado de QFrame.

const QwtPlot * QwtPlotCanvas::plot

(

)

const

Return parent plot widget.

QwtPlot * QwtPlotCanvas::plot

(

)

Return parent plot widget.

void QwtPlotCanvas::setFocusIndicator

(

FocusIndicator

focusIndicator

)

Set the focus indicator

Ver también:

FocusIndicator, focusIndicator

void QwtPlotCanvas::setPaintAttribute	(	PaintAttribute	attribute,
		bool	on = true
	)

Changing the paint attributes.

Parámetros:

attribute	Paint attribute
on	On/Off

The default setting enables PaintCached and PaintPacked

Ver también:

testPaintAttribute(), drawCanvas(), drawContents(), paintCache()

bool QwtPlotCanvas::testPaintAttribute

(

PaintAttribute

attribute

)

const

Test wether a paint attribute is enabled

Parámetros:

attribute

Paint attribute

Devuelve:

true if the attribute is enabled

Ver también:

setPaintAttribute()

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

• src/qwt/src/qwt_plot_canvas.h
• src/qwt/src/qwt_plot_canvas.cpp