QwtPlotGLCanvas - Man Page

An alternative canvas for a QwtPlot derived from QGLWidget.

Synopsis

#include <qwt_plot_glcanvas.h>

Inherits QGLWidget.

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

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

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 unsupported 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 canvas

Parameters

painter Painter

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

Draw the border of the canvas

Parameters

painter Painter

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

Draw the plot items

Parameters

painter Painter

See also

QwtPlot::drawCanvas()

bool QwtPlotGLCanvas::event (QEvent * event) [virtual]

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

Parameters

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 event

Parameters

event Paint event

See also

QwtPlot::drawCanvas()

void QwtPlotGLCanvas::setFrameShadow (Shadow shadow)

Set the frame shadow

Parameters

shadow Frame shadow

See also

frameShadow(), setFrameShape(), QFrame::setFrameShadow()

void QwtPlotGLCanvas::setFrameShape (Shape shape)

Set the frame shape

Parameters

shape Frame shape

See also

frameShape(), setFrameShadow(), QFrame::frameShape()

void QwtPlotGLCanvas::setFrameStyle (int style)

Set the frame style

Parameters

style The 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

width Line 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

width Midline width of the frame

See also

midLineWidth(), setLineWidth()

Author

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Info

Mon Jun 1 2020 Version 6.1.5 Qwt User's Guide