Qwt User's Guide: QwtPlotGLCanvas Class Reference

Qwt User's Guide 6.1.3

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QwtPlotGLCanvas Class Reference

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

`#include <qwt_plot_glcanvas.h>`

Inheritance diagram for QwtPlotGLCanvas:
[legend]

## 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

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 | ) |
| protectedvirtual

Draw the background of the canvas

Parameters

  painter | Painter

void QwtPlotGLCanvas::drawBorder | ( | QPainter * | painter | ) |
| protectedvirtual

Draw the border of the canvas

Parameters

  painter | Painter

void QwtPlotGLCanvas::drawItems | ( | QPainter * | painter | ) |
| protectedvirtual

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 | ) |
| protectedvirtual

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()