QwtPlotOpenGLCanvas - An alternative canvas for a QwtPlot derived from QOpenGLWidget.
NAME SYNOPSIS Public Slots Public Member Functions Protected Member Functions Additional Inherited Members Detailed Description Constructor & Destructor Documentation QwtPlotOpenGLCanvas::QwtPlotOpenGLCanvas (QwtPlot * plot = NULL) [explicit] QwtPlotOpenGLCanvas::QwtPlotOpenGLCanvas (int numSamples, QwtPlot * plot =NULL) [explicit] QwtPlotOpenGLCanvas::˜QwtPlotOpenGLCanvas () [virtual] Member Function Documentation QPainterPath QwtPlotOpenGLCanvas::borderPath (const QRect & rect) const void QwtPlotOpenGLCanvas::clearBackingStore () [override], [private],[virtual] bool QwtPlotOpenGLCanvas::event (QEvent * event) [override], [virtual] void QwtPlotOpenGLCanvas::initializeGL () [override], [protected],[virtual] void QwtPlotOpenGLCanvas::invalidateBackingStore () [override], [virtual] void QwtPlotOpenGLCanvas::paintEvent (QPaintEvent * event) [override],[protected], [virtual] void QwtPlotOpenGLCanvas::paintGL () [override], [protected], [virtual] void QwtPlotOpenGLCanvas::replot () [slot] void QwtPlotOpenGLCanvas::resizeGL (int width, int height) [override],[protected], [virtual] AuthorNAME
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 (int samples, 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
Public Member Functions inherited from QwtPlotAbstractGLCanvas
QwtPlotAbstractGLCanvas
(QWidget *canvasWidget)
Constructor.
virtual ˜QwtPlotAbstractGLCanvas ()
Destructor.
void setPaintAttribute (PaintAttribute, bool
on=true)
Changing the paint attributes.
bool testPaintAttribute (PaintAttribute) const
void setFrameStyle (int style)
int frameStyle () const
void setFrameShadow (QFrame::Shadow)
QFrame::Shadow frameShadow () const
void setFrameShape (QFrame::Shape)
QFrame::Shape frameShape () const
void setLineWidth (int)
int lineWidth () const
void setMidLineWidth (int)
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)
FocusIndicator focusIndicator () const
void setBorderRadius (double)
double borderRadius () const
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.
Protected Member Functions inherited from QwtPlotAbstractGLCanvas
void replot ()
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 *)
virtual void drawBorder (QPainter *)
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.
Additional Inherited Members
Public Types inherited from QwtPlotAbstractGLCanvas
enum PaintAttribute {
BackingStore = 1, ImmediatePaint = 8 }
Paint attributes.
typedef QFlags< PaintAttribute >
PaintAttributes
Paint attributes.
Public Types inherited from QwtPlotAbstractCanvas
enum FocusIndicator {
NoFocusIndicator, CanvasFocusIndicator,
ItemFocusIndicator }
Focus indicator The default setting is NoFocusIndicator.
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 49 of file qwt_plot_opengl_canvas.cpp.
QwtPlotOpenGLCanvas::QwtPlotOpenGLCanvas (int numSamples, QwtPlot * plot =NULL) [explicit]
Constructor.
Parameters
numSamples Number of
samples, see QSurfaceFormat::samples()
plot Parent plot widget
See also
QwtPlot::setCanvas()
Definition at line 63 of file qwt_plot_opengl_canvas.cpp.
QwtPlotOpenGLCanvas::˜QwtPlotOpenGLCanvas () [virtual]
Destructor.
Definition at line 94 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 185 of file qwt_plot_opengl_canvas.cpp.
void QwtPlotOpenGLCanvas::clearBackingStore () [override], [private],[virtual]
Implements QwtPlotAbstractGLCanvas.
Definition at line 170 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 116 of file qwt_plot_opengl_canvas.cpp.
void QwtPlotOpenGLCanvas::initializeGL () [override], [protected],[virtual]
No operation - reserved for some potential use in the future.
Definition at line 191 of file qwt_plot_opengl_canvas.cpp.
void QwtPlotOpenGLCanvas::invalidateBackingStore () [override], [virtual]
Invalidate the internal backing store.
Implements QwtPlotAbstractGLCanvas.
Definition at line 165 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 105 of file qwt_plot_opengl_canvas.cpp.
void QwtPlotOpenGLCanvas::paintGL () [override], [protected], [virtual]
Paint the plot.
Definition at line 196 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 159 of file qwt_plot_opengl_canvas.cpp.
void QwtPlotOpenGLCanvas::resizeGL (int width, int height) [override],[protected], [virtual]
No operation - reserved for some potential use in the future.
Definition at line 270 of file qwt_plot_opengl_canvas.cpp.
Author
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