QwtPlotGLCanvas - An alternative canvas for a QwtPlot derived from QGLWidget.
NAME SYNOPSIS Public Slots Public Member Functions Protected Member Functions Additional Inherited Members Detailed Description Constructor & Destructor Documentation QwtPlotGLCanvas::QwtPlotGLCanvas (QwtPlot * plot = NULL) [explicit] QwtPlotGLCanvas::QwtPlotGLCanvas (const QGLFormat & format, QwtPlot * plot= NULL) [explicit] QwtPlotGLCanvas::˜QwtPlotGLCanvas () [virtual] Member Function Documentation QPainterPath QwtPlotGLCanvas::borderPath (const QRect & rect) const void QwtPlotGLCanvas::clearBackingStore () [override], [private],[virtual] bool QwtPlotGLCanvas::event (QEvent * event) [override], [virtual] void QwtPlotGLCanvas::initializeGL () [override], [protected], [virtual] void QwtPlotGLCanvas::invalidateBackingStore () [override], [virtual] void QwtPlotGLCanvas::paintEvent (QPaintEvent * event) [override],[protected], [virtual] void QwtPlotGLCanvas::paintGL () [override], [protected], [virtual] void QwtPlotGLCanvas::replot () [slot] void QwtPlotGLCanvas::resizeGL (int width, int height) [override],[protected], [virtual] AuthorNAME
QwtPlotGLCanvas − An alternative canvas for a QwtPlot derived from QGLWidget.
SYNOPSIS
#include <qwt_plot_glcanvas.h>
Inherits QGLWidget, and QwtPlotAbstractGLCanvas.
Public Slots
void replot ()
Public Member Functions
QwtPlotGLCanvas
(QwtPlot *=NULL)
Constructor.
QwtPlotGLCanvas (const QGLFormat &, QwtPlot
*=NULL)
Constructor.
virtual ˜QwtPlotGLCanvas ()
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 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::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::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 () [virtual]
Destructor.
Definition at line 77 of file qwt_plot_glcanvas.cpp.
Member Function Documentation
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.
void QwtPlotGLCanvas::clearBackingStore () [override], [private],[virtual]
Implements QwtPlotAbstractGLCanvas.
Definition at line 142 of file qwt_plot_glcanvas.cpp.
bool QwtPlotGLCanvas::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 110 of file qwt_plot_glcanvas.cpp.
void QwtPlotGLCanvas::initializeGL () [override], [protected], [virtual]
No operation - reserved for some potential use in the future.
Definition at line 163 of file qwt_plot_glcanvas.cpp.
void QwtPlotGLCanvas::invalidateBackingStore () [override], [virtual]
Invalidate the internal backing store.
Implements QwtPlotAbstractGLCanvas.
Definition at line 137 of file qwt_plot_glcanvas.cpp.
void QwtPlotGLCanvas::paintEvent (QPaintEvent * event) [override],[protected], [virtual]
Paint event
Parameters
event Paint event
See also
QwtPlot::drawCanvas()
Definition at line 100 of file qwt_plot_glcanvas.cpp.
void QwtPlotGLCanvas::paintGL () [override], [protected], [virtual]
Paint the plot.
Definition at line 168 of file qwt_plot_glcanvas.cpp.
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.
void QwtPlotGLCanvas::resizeGL (int width, int height) [override],[protected], [virtual]
No operation - reserved for some potential use in the future.
Definition at line 233 of file qwt_plot_glcanvas.cpp.
Author
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