QwtPlotGLCanvas (3) - Linux Manuals
NAME
QwtPlotGLCanvas -
An alternative canvas for a QwtPlot derived from QGLWidget.
SYNOPSIS
#include <qwt_plot_glcanvas.h>
Public Types
enum Shadow { Plain = QFrame::Plain, Raised = QFrame::Raised, Sunken = QFrame::Sunken }
Frame shadow.
enum Shape { NoFrame = QFrame::NoFrame, Box = QFrame::Box, Panel = QFrame::Panel }
Frame shape.
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:
-
You might want to use the QPaintEngine::OpenGL paint engine ( see QGL::setPreferredPaintEngine() ). On a Linux test system QPaintEngine::OpenGL2 shows very basic problems ( wrong geometries of rectangles ) but also more advanced stuff like antialiasing doesn't work.
Another way to introduce OpenGL rendering to Qwt is to use QGLPixelBuffer or QGLFramebufferObject. Both type of buffers can be converted into a QImage and used in combination with a regular QwtPlotCanvas.
Member Enumeration Documentation
enum QwtPlotGLCanvas::Shadow
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.
enum QwtPlotGLCanvas::Shape
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:
- plot Parent 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 canvasParameters:
- painter Painter
void QwtPlotGLCanvas::drawBorder (QPainter *painter) [protected], [virtual]
Draw the border of the canvasParameters:
- painter Painter
void QwtPlotGLCanvas::drawItems (QPainter *painter) [protected], [virtual]
Draw the plot itemsParameters:
- painter Painter
See Also:
- QwtPlot::drawCanvas()
bool QwtPlotGLCanvas::event (QEvent *event) [virtual]
Qt event handler for QEvent::PolishRequest and QEvent::StyleChangeParameters:
- event Qt 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) [protected], [virtual]
Paint eventParameters:
- event Paint event
See Also:
- QwtPlot::drawCanvas()
void QwtPlotGLCanvas::setFrameShadow (Shadowshadow)
Set the frame shadowParameters:
- shadow Frame shadow
See Also:
- frameShadow(), setFrameShape(), QFrame::setFrameShadow()
void QwtPlotGLCanvas::setFrameShape (Shapeshape)
Set the frame shapeParameters:
- shape Frame shape
See Also:
- frameShape(), setFrameShadow(), QFrame::frameShape()
void QwtPlotGLCanvas::setFrameStyle (intstyle)
Set the frame styleParameters:
- style The bitwise OR between a shape and a shadow.
See Also:
- frameStyle(), QFrame::setFrameStyle(), setFrameShadow(), setFrameShape()
void QwtPlotGLCanvas::setLineWidth (intwidth)
Set the frame line widthThe default line width is 2 pixels.
Parameters:
- width Line width of the frame
See Also:
- lineWidth(), setMidLineWidth()
void QwtPlotGLCanvas::setMidLineWidth (intwidth)
Set the frame mid line widthThe default midline width is 0 pixels.
Parameters:
- width Midline width of the frame
See Also:
- midLineWidth(), setLineWidth()
Author
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