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

#include <qwt_plot_glcanvas.h>

Inheritance diagram for QwtPlotGLCanvas:

[legend]

Classes
class	PrivateData

Public Slots
void	replot ()

Public Member Functions
Q_INVOKABLE QPainterPath	borderPath (const QRect &) const

virtual bool	event (QEvent *) QWT_OVERRIDE

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

	QwtPlotGLCanvas (const QGLFormat &, QwtPlot *=NULL)
	Constructor. More...

	QwtPlotGLCanvas (QwtPlot *=NULL)
	Constructor. More...

virtual	~QwtPlotGLCanvas ()
	Destructor. More...

Public Member Functions inherited from QwtPlotAbstractGLCanvas
QRect	frameRect () const

QFrame::Shadow	frameShadow () const

QFrame::Shape	frameShape () const

int	frameStyle () const

int	frameWidth () const

int	lineWidth () const

int	midLineWidth () const

	QwtPlotAbstractGLCanvas (QWidget *canvasWidget)
	Paint attributes. More...

void	setFrameShadow (QFrame::Shadow)

void	setFrameShape (QFrame::Shape)

void	setFrameStyle (int style)

void	setLineWidth (int)

void	setMidLineWidth (int)

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

bool	testPaintAttribute (PaintAttribute) const

virtual	~QwtPlotAbstractGLCanvas ()
	Destructor. More...

Public Member Functions inherited from QwtPlotAbstractCanvas
double	borderRadius () const

FocusIndicator	focusIndicator () const

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

const QwtPlot *	plot () const

	QwtPlotAbstractCanvas (QWidget *canvasWidget)
	Constructor. More...

void	setBorderRadius (double)

void	setFocusIndicator (FocusIndicator)

virtual	~QwtPlotAbstractCanvas ()
	Destructor. More...

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

virtual void	paintEvent (QPaintEvent *) QWT_OVERRIDE

virtual void	paintGL () QWT_OVERRIDE
	Paint the plot. More...

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

Protected Member Functions inherited from QwtPlotAbstractGLCanvas
void	draw (QPainter *)
	Helper function for the derived plot canvas. More...

void	replot ()

Protected Member Functions inherited from QwtPlotAbstractCanvas
QPainterPath	canvasBorderPath (const QRect &rect) const

QWidget *	canvasWidget ()

const QWidget *	canvasWidget () const

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

virtual void	drawBorder (QPainter *)

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

virtual void	drawFocusIndicator (QPainter *)

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

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

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

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

Properties
double	borderRadius

QRect	frameRect

QFrame::Shadow	frameShadow

QFrame::Shape	frameShape

int	frameWidth

int	lineWidth

int	midLineWidth

Private Member Functions
virtual void	clearBackingStore () QWT_OVERRIDE

void	init ()

Private Attributes
PrivateData *	m_data

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 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.

Since Qt 5.4 QOpenGLWidget is available, that is used by QwtPlotOpenGLCanvas.

See also: QwtPlot::setCanvas(), QwtPlotCanvas, QwtPlotOpenGLCanvas

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 45 of file qwt_plot_glcanvas.h.

Constructor & Destructor Documentation

◆ QwtPlotGLCanvas() [1/2]

QwtPlotGLCanvas::QwtPlotGLCanvas ( QwtPlot * plot = NULL )

explicit

Constructor.

Parameters

plot	Parent plot widget

See also: QwtPlot::setCanvas()

Definition at line 56 of file qwt_plot_glcanvas.cpp.

◆ QwtPlotGLCanvas() [2/2]

QwtPlotGLCanvas::QwtPlotGLCanvas	(	const QGLFormat &	format,
		QwtPlot *	plot = `NULL`
	)

explicit

Constructor.

Parameters

format	OpenGL rendering options
plot	Parent plot widget

See also: QwtPlot::setCanvas()

Definition at line 69 of file qwt_plot_glcanvas.cpp.

◆ ~QwtPlotGLCanvas()

QwtPlotGLCanvas::~QwtPlotGLCanvas ( )

virtual

Destructor.

Definition at line 77 of file qwt_plot_glcanvas.cpp.

Member Function Documentation

◆ borderPath()

QPainterPath QwtPlotGLCanvas::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

Definition at line 157 of file qwt_plot_glcanvas.cpp.

◆ clearBackingStore()

void QwtPlotGLCanvas::clearBackingStore ( )

privatevirtual

Implements QwtPlotAbstractGLCanvas.

Definition at line 142 of file qwt_plot_glcanvas.cpp.

◆ event()

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 110 of file qwt_plot_glcanvas.cpp.

◆ init()

void QwtPlotGLCanvas::init ( )

private

Definition at line 82 of file qwt_plot_glcanvas.cpp.

◆ initializeGL()

void QwtPlotGLCanvas::initializeGL ( )

protectedvirtual

No operation - reserved for some potential use in the future.

Definition at line 163 of file qwt_plot_glcanvas.cpp.

◆ invalidateBackingStore()

void QwtPlotGLCanvas::invalidateBackingStore ( )

virtual

Invalidate the internal backing store.

Implements QwtPlotAbstractGLCanvas.

Definition at line 137 of file qwt_plot_glcanvas.cpp.

◆ paintEvent()

void QwtPlotGLCanvas::paintEvent ( QPaintEvent * event )

protectedvirtual

Paint event

Parameters

event Paint event

See also: QwtPlot::drawCanvas()

Definition at line 100 of file qwt_plot_glcanvas.cpp.

◆ paintGL()

void QwtPlotGLCanvas::paintGL ( )

protectedvirtual

Paint the plot.

Definition at line 168 of file qwt_plot_glcanvas.cpp.

◆ replot

void QwtPlotGLCanvas::replot ( )

slot

Invalidate the paint cache and repaint the canvas

See also: invalidatePaintCache()

Definition at line 131 of file qwt_plot_glcanvas.cpp.

◆ resizeGL()

void QwtPlotGLCanvas::resizeGL	(	int	width,
		int	height
	)

protectedvirtual

No operation - reserved for some potential use in the future.

Definition at line 233 of file qwt_plot_glcanvas.cpp.

Member Data Documentation

◆ m_data

PrivateData* QwtPlotGLCanvas::m_data

private

Definition at line 82 of file qwt_plot_glcanvas.h.

Property Documentation

◆ borderRadius

double QwtPlotGLCanvas::borderRadius

readwrite

Definition at line 56 of file qwt_plot_glcanvas.h.

◆ frameRect

QRect QwtPlotGLCanvas::frameRect

read

Definition at line 54 of file qwt_plot_glcanvas.h.

◆ frameShadow

QFrame::Shadow QwtPlotGLCanvas::frameShadow

readwrite

Definition at line 49 of file qwt_plot_glcanvas.h.

◆ frameShape

QFrame::Shape QwtPlotGLCanvas::frameShape

readwrite

Definition at line 50 of file qwt_plot_glcanvas.h.

◆ frameWidth

int QwtPlotGLCanvas::frameWidth

read

Definition at line 53 of file qwt_plot_glcanvas.h.

◆ lineWidth

int QwtPlotGLCanvas::lineWidth

readwrite

Definition at line 51 of file qwt_plot_glcanvas.h.

◆ midLineWidth

int QwtPlotGLCanvas::midLineWidth

readwrite

Definition at line 52 of file qwt_plot_glcanvas.h.

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

Classes

Public Slots

Public Member Functions

Protected Member Functions

Properties

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QwtPlotGLCanvas() [1/2]

◆ QwtPlotGLCanvas() [2/2]

◆ ~QwtPlotGLCanvas()

Member Function Documentation

◆ borderPath()

◆ clearBackingStore()

◆ event()

◆ init()

◆ initializeGL()

◆ invalidateBackingStore()

◆ paintEvent()

◆ paintGL()

◆ replot

◆ resizeGL()

Member Data Documentation

◆ m_data

Property Documentation

◆ borderRadius

◆ frameRect

◆ frameShadow

◆ frameShape

◆ frameWidth

◆ lineWidth

◆ midLineWidth