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

#include <qwt_plot_opengl_canvas.h>

Inheritance diagram for QwtPlotOpenGLCanvas:

Classes
class	PrivateData

Public Slots
void	replot ()
	Invalidate the paint cache and repaint the canvas.

Public Member Functions
	QwtPlotOpenGLCanvas (QwtPlot *=NULL)
	Constructor.

	QwtPlotOpenGLCanvas (const QSurfaceFormat &, QwtPlot *=NULL)
	Constructor.

virtual	~QwtPlotOpenGLCanvas ()
	Destructor.

virtual Q_INVOKABLE void	invalidateBackingStore () QWT_OVERRIDE
	Invalidate the internal backing store.

Q_INVOKABLE QPainterPath	borderPath (const QRect &) const
	Calculate the painter path for a styled or rounded border.

virtual bool	event (QEvent *) QWT_OVERRIDE
	Qt event handler for QEvent::PolishRequest and QEvent::StyleChange.

Public Member Functions inherited from QwtPlotAbstractGLCanvas
	QwtPlotAbstractGLCanvas (QWidget *canvasWidget)
	Paint attributes.

virtual	~QwtPlotAbstractGLCanvas ()
	Destructor.

void	setPaintAttribute (PaintAttribute, bool on=true)
	Changing the paint attributes.

bool	testPaintAttribute (PaintAttribute) const
	Test whether a paint attribute is enabled.

void	setFrameStyle (int style)
	Set the frame style.

int	frameStyle () const

void	setFrameShadow (QFrame::Shadow)
	Set the frame shadow.

QFrame::Shadow	frameShadow () const

void	setFrameShape (QFrame::Shape)
	Set the frame shape.

QFrame::Shape	frameShape () const

void	setLineWidth (int)
	Set the frame line width.

int	lineWidth () const

void	setMidLineWidth (int)
	Set the frame mid line width.

int	midLineWidth () const

int	frameWidth () const

QRect	frameRect () const

Public Member Functions inherited from QwtPlotAbstractCanvas
	QwtPlotAbstractCanvas (QWidget *canvasWidget)
	Constructor.

virtual	~QwtPlotAbstractCanvas ()
	Destructor.

QwtPlot *	plot ()
	Return parent plot widget.

const QwtPlot *	plot () const
	Return parent plot widget.

void	setFocusIndicator (FocusIndicator)
	Set the focus indicator.

FocusIndicator	focusIndicator () const

void	setBorderRadius (double)
	Set the radius for the corners of the border frame.

double	borderRadius () const

Protected Member Functions
virtual void	paintEvent (QPaintEvent *) QWT_OVERRIDE
	Paint event.

virtual void	initializeGL () QWT_OVERRIDE
	No operation - reserved for some potential use in the future.

virtual void	paintGL () QWT_OVERRIDE
	Paint the plot.

virtual void	resizeGL (int width, int height) QWT_OVERRIDE
	No operation - reserved for some potential use in the future.

Protected Member Functions inherited from QwtPlotAbstractGLCanvas
void	replot ()
	Invalidate the paint cache and repaint the canvas.

void	draw (QPainter *)
	Helper function for the derived plot canvas.

Protected Member Functions inherited from QwtPlotAbstractCanvas
QWidget *	canvasWidget ()

const QWidget *	canvasWidget () const

virtual void	drawFocusIndicator (QPainter *)
	Draw the focus indication.

virtual void	drawBorder (QPainter *)
	Draw the border of the canvas.

virtual void	drawBackground (QPainter *)
	Helper function for the derived plot canvas.

void	fillBackground (QPainter *)
	Helper function for the derived plot canvas.

void	drawCanvas (QPainter *)
	Draw the plot to the canvas.

void	drawStyled (QPainter *, bool)
	Helper function for the derived plot canvas.

void	drawUnstyled (QPainter *)
	Helper function for the derived plot canvas.

QPainterPath	canvasBorderPath (const QRect &rect) const

void	updateStyleSheetInfo ()
	Update the cached information about the current style sheet.

Properties
QFrame::Shadow	frameShadow

QFrame::Shape	frameShape

int	lineWidth

int	midLineWidth

int	frameWidth

QRect	frameRect

double	borderRadius

Additional Inherited Members
Public Types inherited from QwtPlotAbstractGLCanvas
enum	PaintAttribute { BackingStore = 1 , ImmediatePaint = 8 }
	Paint attributes. More...

Public Types inherited from QwtPlotAbstractCanvas
enum	FocusIndicator { NoFocusIndicator , CanvasFocusIndicator , ItemFocusIndicator }
	Focus indicator The default setting is NoFocusIndicator. More...

Detailed Description

An alternative canvas for a QwtPlot derived from QOpenGLWidget.

Even if QwtPlotOpenGLCanvas 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: 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 QOpenGLWidget, but is usually better integrated into a desktop application.

Constructor & Destructor Documentation

◆ QwtPlotOpenGLCanvas() [1/2]

QwtPlotOpenGLCanvas::QwtPlotOpenGLCanvas ( QwtPlot * plot = NULL )

explicit

Constructor.

Parameters

plot	Parent plot widget

See also: QwtPlot::setCanvas()

◆ QwtPlotOpenGLCanvas() [2/2]

QwtPlotOpenGLCanvas::QwtPlotOpenGLCanvas	(	const QSurfaceFormat &	format,
		QwtPlot *	plot = `NULL`
	)

explicit

Constructor.

Parameters

format	OpenGL surface format
plot	Parent plot widget

See also: QwtPlot::setCanvas()

Member Function Documentation

◆ borderPath()

QPainterPath QwtPlotOpenGLCanvas::borderPath ( const QRect & rect ) const

Calculate the painter path for a styled or rounded border.

When the canvas has no styled background or rounded borders the painter path is empty.

Parameters

rect	Bounding rectangle of the canvas

Returns: Painter path, that can be used for clipping

◆ event()

bool QwtPlotOpenGLCanvas::event ( QEvent * event )

virtual

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

Parameters

event Qt Event

Returns: See QGLWidget::event()

◆ invalidateBackingStore()

void QwtPlotOpenGLCanvas::invalidateBackingStore ( )

virtual

Invalidate the internal backing store.

Implements QwtPlotAbstractGLCanvas.

◆ paintEvent()

void QwtPlotOpenGLCanvas::paintEvent ( QPaintEvent * event )

protectedvirtual

Paint event.

Parameters

event Paint event

See also: QwtPlot::drawCanvas()

◆ replot

void QwtPlotOpenGLCanvas::replot ( )

slot

Invalidate the paint cache and repaint the canvas.

See also: invalidatePaintCache()

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

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

Classes

Public Slots

Public Member Functions

Protected Member Functions

Properties

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QwtPlotOpenGLCanvas() [1/2]

◆ QwtPlotOpenGLCanvas() [2/2]

Member Function Documentation

◆ borderPath()

◆ event()

◆ invalidateBackingStore()

◆ paintEvent()

◆ replot