Qwt User's Guide  6.1.3
QwtPlotGLCanvas Class Reference

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

#include <qwt_plot_glcanvas.h>

Inheritance diagram for QwtPlotGLCanvas:

Public Types

enum  Shadow { Plain = QFrame::Plain, Raised = QFrame::Raised, Sunken = QFrame::Sunken }
 Frame shadow. More...
 
enum  Shape { NoFrame = QFrame::NoFrame, Box = QFrame::Box, Panel = QFrame::Panel }
 Frame shape. More...
 

Public Slots

void replot ()
 Calls repaint()
 

Public Member Functions

 QwtPlotGLCanvas (QwtPlot *=NULL)
 Constructor. More...
 
virtual ~QwtPlotGLCanvas ()
 Destructor.
 
void setFrameStyle (int style)
 
int frameStyle () const
 
void setFrameShadow (Shadow)
 
Shadow frameShadow () const
 
void setFrameShape (Shape)
 
Shape frameShape () const
 
void setLineWidth (int)
 
int lineWidth () const
 
void setMidLineWidth (int)
 
int midLineWidth () const
 
int frameWidth () const
 
QRect frameRect () const
 
Q_INVOKABLE QPainterPath borderPath (const QRect &) const
 
virtual bool event (QEvent *)
 

Protected Member Functions

virtual void paintEvent (QPaintEvent *)
 
virtual void drawBackground (QPainter *)
 
virtual void drawBorder (QPainter *)
 
virtual void drawItems (QPainter *)
 

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.

See also
QwtPlot::setCanvas(), QwtPlotCanvas
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.

Member Enumeration Documentation

Frame shadow.

Unfortunately it is not possible to use QFrame::Shadow as a property of a widget that is not derived from QFrame. The following enum is made for the designer only. It is safe to use QFrame::Shadow instead.

Enumerator
Plain 

QFrame::Plain.

Raised 

QFrame::Raised.

Sunken 

QFrame::Sunken.

Frame shape.

Unfortunately it is not possible to use QFrame::Shape as a property of a widget that is not derived from QFrame. The following enum is made for the designer only. It is safe to use QFrame::Shadow instead.

Note
QFrame::StyledPanel and QFrame::WinPanel are unsuported and will be displayed as QFrame::Panel.

Constructor & Destructor Documentation

QwtPlotGLCanvas::QwtPlotGLCanvas ( QwtPlot plot = NULL)
explicit

Constructor.

Parameters
plotParent plot widget
See also
QwtPlot::setCanvas()

Member Function Documentation

QPainterPath QwtPlotGLCanvas::borderPath ( const QRect &  rect) const
Returns
Empty path
void QwtPlotGLCanvas::drawBackground ( QPainter *  painter)
protectedvirtual

Draw the background of the canvas

Parameters
painterPainter
void QwtPlotGLCanvas::drawBorder ( QPainter *  painter)
protectedvirtual

Draw the border of the canvas

Parameters
painterPainter
void QwtPlotGLCanvas::drawItems ( QPainter *  painter)
protectedvirtual

Draw the plot items

Parameters
painterPainter
See also
QwtPlot::drawCanvas()
bool QwtPlotGLCanvas::event ( QEvent *  event)
virtual

Qt event handler for QEvent::PolishRequest and QEvent::StyleChange

Parameters
eventQt Event
Returns
See QGLWidget::event()
QRect QwtPlotGLCanvas::frameRect ( ) const
Returns
The rectangle where the frame is drawn in.
QwtPlotGLCanvas::Shadow QwtPlotGLCanvas::frameShadow ( ) const
Returns
Frame shadow
See also
setFrameShadow(), QFrame::setFrameShadow()
QwtPlotGLCanvas::Shape QwtPlotGLCanvas::frameShape ( ) const
Returns
Frame shape
See also
setFrameShape(), QFrame::frameShape()
int QwtPlotGLCanvas::frameStyle ( ) const
Returns
The bitwise OR between a frameShape() and a frameShadow()
See also
setFrameStyle(), QFrame::frameStyle()
int QwtPlotGLCanvas::frameWidth ( ) const
Returns
Frame width depending on the style, line width and midline width.
int QwtPlotGLCanvas::lineWidth ( ) const
Returns
Line width of the frame
See also
setLineWidth(), midLineWidth()
int QwtPlotGLCanvas::midLineWidth ( ) const
Returns
Midline width of the frame
See also
setMidLineWidth(), lineWidth()
void QwtPlotGLCanvas::paintEvent ( QPaintEvent *  event)
protectedvirtual

Paint event

Parameters
eventPaint event
See also
QwtPlot::drawCanvas()
void QwtPlotGLCanvas::setFrameShadow ( Shadow  shadow)

Set the frame shadow

Parameters
shadowFrame shadow
See also
frameShadow(), setFrameShape(), QFrame::setFrameShadow()
void QwtPlotGLCanvas::setFrameShape ( Shape  shape)

Set the frame shape

Parameters
shapeFrame shape
See also
frameShape(), setFrameShadow(), QFrame::frameShape()
void QwtPlotGLCanvas::setFrameStyle ( int  style)

Set the frame style

Parameters
styleThe bitwise OR between a shape and a shadow.
See also
frameStyle(), QFrame::setFrameStyle(), setFrameShadow(), setFrameShape()
void QwtPlotGLCanvas::setLineWidth ( int  width)

Set the frame line width

The default line width is 2 pixels.

Parameters
widthLine width of the frame
See also
lineWidth(), setMidLineWidth()
void QwtPlotGLCanvas::setMidLineWidth ( int  width)

Set the frame mid line width

The default midline width is 0 pixels.

Parameters
widthMidline width of the frame
See also
midLineWidth(), setLineWidth()