QwtPlotOpenGLCanvas(3)         Qwt User's Guide         QwtPlotOpenGLCanvas(3)

NAME
       QwtPlotOpenGLCanvas - An alternative canvas for a QwtPlot derived from
       QOpenGLWidget.


SYNOPSIS
       #include <qwt_plot_opengl_canvas.h>

       Inherits QOpenGLWidget, and QwtPlotAbstractGLCanvas.

   Public Slots
       void replot ()

   Public Member Functions
       QwtPlotOpenGLCanvas (QwtPlot *=NULL)
           Constructor.
       QwtPlotOpenGLCanvas (const QSurfaceFormat &, QwtPlot *=NULL)
           Constructor.
       virtual ~QwtPlotOpenGLCanvas ()
           Destructor.
       virtual Q_INVOKABLE void invalidateBackingStore () override
           Invalidate the internal backing store.
       Q_INVOKABLE QPainterPath borderPath (const QRect &) const
       virtual bool event (QEvent *) override

   Protected Member Functions
       virtual void paintEvent (QPaintEvent *) override
       virtual void initializeGL () override
           No operation - reserved for some potential use in the future.
       virtual void paintGL () override
           Paint the plot.
       virtual void resizeGL (int width, int height) override
           No operation - reserved for some potential use in the future.

   Additional Inherited Members

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.

       Definition at line 34 of file qwt_plot_opengl_canvas.h.

Constructor & Destructor Documentation
   QwtPlotOpenGLCanvas::QwtPlotOpenGLCanvas (QwtPlot * plot = NULL) [explicit]
       Constructor.

       Parameters
           plot Parent plot widget

       See also
           QwtPlot::setCanvas()

       Definition at line 48 of file qwt_plot_opengl_canvas.cpp.

   QwtPlotOpenGLCanvas::QwtPlotOpenGLCanvas (const QSurfaceFormat & format,
       QwtPlot * plot = NULL) [explicit]
       Constructor.

       Parameters
           format OpenGL surface format
           plot Parent plot widget

       See also
           QwtPlot::setCanvas()

       Definition at line 65 of file qwt_plot_opengl_canvas.cpp.

Member Function Documentation
   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

       Definition at line 168 of file qwt_plot_opengl_canvas.cpp.

   bool QwtPlotOpenGLCanvas::event (QEvent * event) [override],  [virtual]
       Qt event handler for QEvent::PolishRequest and QEvent::StyleChange

       Parameters
           event Qt Event

       Returns
           See QGLWidget::event()

       Definition at line 112 of file qwt_plot_opengl_canvas.cpp.

   void QwtPlotOpenGLCanvas::paintEvent (QPaintEvent * event) [override],
       [protected],  [virtual]
       Paint event

       Parameters
           event Paint event

       See also
           QwtPlot::drawCanvas()

       Definition at line 101 of file qwt_plot_opengl_canvas.cpp.

   void QwtPlotOpenGLCanvas::replot () [slot]
       Invalidate the paint cache and repaint the canvas

       See also
           invalidatePaintCache()

       Definition at line 142 of file qwt_plot_opengl_canvas.cpp.


Author
       Generated automatically by Doxygen for Qwt User's Guide from the source
       code.

Version 6.2.0                   Sun Jul 18 2021         QwtPlotOpenGLCanvas(3)