QwtPlotGLCanvas Class Reference

An alternative canvas for a QwtPlot derived from QGLWidget. More...

#include <qwt_plot_glcanvas.h>

Inheritance diagram for QwtPlotGLCanvas:

List of all members.

Classes
class	PrivateData
Public Slots
void	replot ()
Public Member Functions
Q_INVOKABLE QPainterPath	borderPath (const QRect &) const
virtual bool	event (QEvent *)
virtual Q_INVOKABLE void	invalidateBackingStore ()
	QwtPlotGLCanvas (QwtPlot *=NULL)
	Constructor.
	QwtPlotGLCanvas (const QGLFormat &, QwtPlot *=NULL)
virtual	~QwtPlotGLCanvas ()
	Destructor.
Protected Member Functions
virtual void	initializeGL ()
virtual void	paintEvent (QPaintEvent *)
virtual void	paintGL ()
virtual void	resizeGL (int width, int height)
Properties
double	borderRadius
QRect	frameRect
QFrame::Shadow	frameShadow
QFrame::Shape	frameShape
int	frameWidth
int	lineWidth
int	midLineWidth
Private Member Functions
virtual void	clearBackingStore ()
Private Attributes
PrivateData *	d_data

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Detailed Description

An alternative canvas for a QwtPlot derived from QGLWidget.

QwtPlotGLCanvas implements the very basics to act as canvas inside of a QwtPlot widget. It might be extended to a full featured alternative to QwtPlotCanvas in a future version of Qwt.

Even if QwtPlotGLCanvas is not derived from QFrame it imitates its API. When using style sheets it supports the box model - beside backgrounds with rounded borders.

See also:

QwtPlot::setCanvas(), QwtPlotCanvas, QwtPlotCanvas::OpenGLBuffer

Note:

With Qt4 you might want to use the QPaintEngine::OpenGL paint engine ( see QGL::setPreferredPaintEngine() ). On a Linux test system QPaintEngine::OpenGL2 shows very basic problems like translated geometries.

Another way for getting hardware accelerated graphics is using an OpenGL offscreen buffer ( QwtPlotCanvas::OpenGLBuffer ) with QwtPlotCanvas. Performance is worse, than rendering straight to a QGLWidget, but is usually better integrated into a desktop application.

Definition at line 42 of file qwt_plot_glcanvas.h.

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Constructor & Destructor Documentation

QwtPlotGLCanvas::QwtPlotGLCanvas

(

QwtPlot *

plot = NULL

)

[explicit]

Constructor.

Parameters:

plot	Parent plot widget

See also:

QwtPlot::setCanvas()

Definition at line 49 of file qwt_plot_glcanvas.cpp.

QwtPlotGLCanvas::QwtPlotGLCanvas	(	const QGLFormat &	format,
		QwtPlot *	plot = NULL
	)		[explicit]

Definition at line 59 of file qwt_plot_glcanvas.cpp.

QwtPlotGLCanvas::~QwtPlotGLCanvas

(

)

[virtual]

Destructor.

Definition at line 70 of file qwt_plot_glcanvas.cpp.

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Member Function Documentation

QPainterPath QwtPlotGLCanvas::borderPath

(

const QRect &

rect

)

const

Definition at line 124 of file qwt_plot_glcanvas.cpp.

void QwtPlotGLCanvas::clearBackingStore

(

)

[private, virtual]

Implements QwtPlotAbstractGLCanvas.

Definition at line 118 of file qwt_plot_glcanvas.cpp.

bool QwtPlotGLCanvas::event

(

QEvent *

event

)

[virtual]

Qt event handler for QEvent::PolishRequest and QEvent::StyleChange

Parameters:

event

Qt Event

Returns:

See QGLWidget::event()

Definition at line 91 of file qwt_plot_glcanvas.cpp.

void QwtPlotGLCanvas::initializeGL

(

)

[protected, virtual]

Definition at line 129 of file qwt_plot_glcanvas.cpp.

void QwtPlotGLCanvas::invalidateBackingStore

(

)

[virtual]

Implements QwtPlotAbstractGLCanvas.

Definition at line 113 of file qwt_plot_glcanvas.cpp.

void QwtPlotGLCanvas::paintEvent

(

QPaintEvent *

event

)

[protected, virtual]

Paint event

Parameters:

event

Paint event

See also:

QwtPlot::drawCanvas()

Definition at line 81 of file qwt_plot_glcanvas.cpp.

void QwtPlotGLCanvas::paintGL

(

)

[protected, virtual]

Definition at line 133 of file qwt_plot_glcanvas.cpp.

void QwtPlotGLCanvas::replot

(

)

[slot]

Invalidate the paint cache and repaint the canvas

See also:

invalidatePaintCache()

Reimplemented from QwtPlotAbstractGLCanvas.

Definition at line 108 of file qwt_plot_glcanvas.cpp.

void QwtPlotGLCanvas::resizeGL	(	int	width,
		int	height
	)		[protected, virtual]

Definition at line 189 of file qwt_plot_glcanvas.cpp.

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Member Data Documentation

PrivateData* QwtPlotGLCanvas::d_data [private]

Reimplemented from QwtPlotAbstractGLCanvas.

Definition at line 78 of file qwt_plot_glcanvas.h.

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Property Documentation

double QwtPlotGLCanvas::borderRadius [read, write]

Definition at line 53 of file qwt_plot_glcanvas.h.

QRect QwtPlotGLCanvas::frameRect [read]

Definition at line 51 of file qwt_plot_glcanvas.h.

QFrame::Shadow QwtPlotGLCanvas::frameShadow [read, write]

Definition at line 46 of file qwt_plot_glcanvas.h.

QFrame::Shape QwtPlotGLCanvas::frameShape [read, write]

Definition at line 47 of file qwt_plot_glcanvas.h.

int QwtPlotGLCanvas::frameWidth [read]

Definition at line 50 of file qwt_plot_glcanvas.h.

int QwtPlotGLCanvas::lineWidth [read, write]

Definition at line 48 of file qwt_plot_glcanvas.h.

int QwtPlotGLCanvas::midLineWidth [read, write]

Definition at line 49 of file qwt_plot_glcanvas.h.

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

• qwt_plot_glcanvas.h
• qwt_plot_glcanvas.cpp