.TH "QwtPlotOpenGLCanvas" 3 "Sun Jul 18 2021" "Version 6.2.0" "Qwt User's Guide" \" -*- nroff -*-
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.SH NAME
QwtPlotOpenGLCanvas \- An alternative canvas for a \fBQwtPlot\fP derived from QOpenGLWidget\&.  

.SH SYNOPSIS
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.PP
.PP
\fC#include <qwt_plot_opengl_canvas\&.h>\fP
.PP
Inherits QOpenGLWidget, and \fBQwtPlotAbstractGLCanvas\fP\&.
.SS "Public Slots"

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.RI "void \fBreplot\fP ()"
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.SS "Public Member Functions"

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.RI "\fBQwtPlotOpenGLCanvas\fP (\fBQwtPlot\fP *=NULL)"
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.RI "Constructor\&. "
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.RI "\fBQwtPlotOpenGLCanvas\fP (const QSurfaceFormat &, \fBQwtPlot\fP *=NULL)"
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.RI "Constructor\&. "
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.RI "virtual \fB~QwtPlotOpenGLCanvas\fP ()"
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.RI "Destructor\&. "
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.RI "virtual Q_INVOKABLE void \fBinvalidateBackingStore\fP () override"
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.RI "Invalidate the internal backing store\&. "
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.RI "Q_INVOKABLE QPainterPath \fBborderPath\fP (const QRect &) const"
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.RI "virtual bool \fBevent\fP (QEvent *) override"
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.SS "Protected Member Functions"

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.RI "virtual void \fBpaintEvent\fP (QPaintEvent *) override"
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.RI "virtual void \fBinitializeGL\fP () override"
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.RI "No operation - reserved for some potential use in the future\&. "
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.RI "virtual void \fBpaintGL\fP () override"
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.RI "Paint the plot\&. "
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.RI "virtual void \fBresizeGL\fP (int width, int height) override"
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.RI "No operation - reserved for some potential use in the future\&. "
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.SS "Additional Inherited Members"
.SH "Detailed Description"
.PP 
An alternative canvas for a \fBQwtPlot\fP derived from QOpenGLWidget\&. 

Even if \fBQwtPlotOpenGLCanvas\fP is not derived from QFrame it imitates its API\&. When using style sheets it supports the box model - beside backgrounds with rounded borders\&.
.PP
\fBSee also\fP
.RS 4
\fBQwtPlot::setCanvas()\fP, \fBQwtPlotCanvas\fP, QwtPlotCanvas::OpenGLBuffer
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.PP
\fBNote\fP
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Another way for getting hardware accelerated graphics is using an OpenGL offscreen buffer ( QwtPlotCanvas::OpenGLBuffer ) with \fBQwtPlotCanvas\fP\&. Performance is worse, than rendering straight to a QOpenGLWidget, but is usually better integrated into a desktop application\&. 
.RE
.PP

.PP
Definition at line 34 of file qwt_plot_opengl_canvas\&.h\&.
.SH "Constructor & Destructor Documentation"
.PP 
.SS "QwtPlotOpenGLCanvas::QwtPlotOpenGLCanvas (\fBQwtPlot\fP * plot = \fCNULL\fP)\fC [explicit]\fP"

.PP
Constructor\&. 
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\fBParameters\fP
.RS 4
\fIplot\fP Parent plot widget 
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\fBSee also\fP
.RS 4
\fBQwtPlot::setCanvas()\fP 
.RE
.PP

.PP
Definition at line 48 of file qwt_plot_opengl_canvas\&.cpp\&.
.SS "QwtPlotOpenGLCanvas::QwtPlotOpenGLCanvas (const QSurfaceFormat & format, \fBQwtPlot\fP * plot = \fCNULL\fP)\fC [explicit]\fP"

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Constructor\&. 
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\fBParameters\fP
.RS 4
\fIformat\fP OpenGL surface format 
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\fIplot\fP Parent plot widget 
.RE
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\fBSee also\fP
.RS 4
\fBQwtPlot::setCanvas()\fP 
.RE
.PP

.PP
Definition at line 65 of file qwt_plot_opengl_canvas\&.cpp\&.
.SH "Member Function Documentation"
.PP 
.SS "QPainterPath QwtPlotOpenGLCanvas::borderPath (const QRect & rect) const"
Calculate the painter path for a styled or rounded border
.PP
When the canvas has no styled background or rounded borders the painter path is empty\&.
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\fBParameters\fP
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\fIrect\fP Bounding rectangle of the canvas 
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\fBReturns\fP
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Painter path, that can be used for clipping 
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Definition at line 168 of file qwt_plot_opengl_canvas\&.cpp\&.
.SS "bool QwtPlotOpenGLCanvas::event (QEvent * event)\fC [override]\fP, \fC [virtual]\fP"
Qt event handler for QEvent::PolishRequest and QEvent::StyleChange 
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\fBParameters\fP
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\fIevent\fP Qt Event 
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\fBReturns\fP
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See QGLWidget::event() 
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.PP
Definition at line 112 of file qwt_plot_opengl_canvas\&.cpp\&.
.SS "void QwtPlotOpenGLCanvas::paintEvent (QPaintEvent * event)\fC [override]\fP, \fC [protected]\fP, \fC [virtual]\fP"
Paint event
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\fBParameters\fP
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\fIevent\fP Paint event 
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\fBSee also\fP
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\fBQwtPlot::drawCanvas()\fP 
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.PP
Definition at line 101 of file qwt_plot_opengl_canvas\&.cpp\&.
.SS "void QwtPlotOpenGLCanvas::replot ()\fC [slot]\fP"
Invalidate the paint cache and repaint the canvas 
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\fBSee also\fP
.RS 4
invalidatePaintCache() 
.RE
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.PP
Definition at line 142 of file qwt_plot_opengl_canvas\&.cpp\&.

.SH "Author"
.PP 
Generated automatically by Doxygen for Qwt User's Guide from the source code\&.