Qwt User's Guide
QwtPlotGLCanvas Class Reference

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

#include <qwt_plot_glcanvas.h>

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.
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) [protected, virtual]

Draw the background of the canvas

Parameters:
painterPainter
void QwtPlotGLCanvas::drawBorder ( QPainter *  painter) [protected, virtual]

Draw the border of the canvas

Parameters:
painterPainter
void QwtPlotGLCanvas::drawItems ( QPainter *  painter) [protected, virtual]

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.
Returns:
Frame shadow
See also:
setFrameShadow(), QFrame::setFrameShadow()
Returns:
Frame shape
See also:
setFrameShape(), QFrame::frameShape()
Returns:
The bitwise OR between a frameShape() and a frameShadow()
See also:
setFrameStyle(), QFrame::frameStyle()
Returns:
Frame width depending on the style, line width and midline width.
Returns:
Line width of the frame
See also:
setLineWidth(), midLineWidth()
Returns:
Midline width of the frame
See also:
setMidLineWidth(), lineWidth()
void QwtPlotGLCanvas::paintEvent ( QPaintEvent *  event) [protected, virtual]

Paint event

Parameters:
eventPaint event
See also:
QwtPlot::drawCanvas()

Set the frame shadow

Parameters:
shadowFrame shadow
See also:
frameShadow(), setFrameShape(), QFrame::setFrameShadow()

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()

List of all members.

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