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QCanvasEllipse Class Reference
[canvas module]
The QCanvasEllipse class provides an ellipse or ellipse segment on a QCanvas. More...
#include <qcanvas.h>
Inherits QCanvasPolygonalItem.
Public Members
- QCanvasEllipse ( QCanvas * canvas )
- QCanvasEllipse ( int width, int height, QCanvas * canvas )
- QCanvasEllipse ( int width, int height, int startangle, int angle, QCanvas * canvas )
- int width () const
- int height () const
- void setSize ( int width, int height )
- void setAngles ( int start, int length )
- int angleStart () const
- int angleLength () const
- virtual int rtti () const
Protected Members
- virtual void drawShape ( QPainter & p )
Detailed Description
The QCanvasEllipse class provides an ellipse or ellipse segment on a QCanvas.A canvas item that paints an ellipse or ellipse segment with a QBrush. The ellipse's height, width, start angle and angle length can be set at construction time. The size can be changed at runtime with setSize(), and the angles can be changed (if you're displaying an ellipse segment rather than a whole ellipse) with setAngles().
Note that angles are specified in 16ths of a degree.
The ellipse can be drawn on a painter with drawShape().
Like any other canvas item ellipses can be moved with move() and moveBy(), or by setting coordinates with setX(), setY() and setZ().
See also Graphics Classes and Image Processing Classes.
Member Function Documentation
QCanvasEllipse::QCanvasEllipse ( QCanvas * canvas )
Constructs a 32x32 ellipse, centered at (0, 0) on canvas.QCanvasEllipse::QCanvasEllipse ( int width, int height, QCanvas * canvas )
Constructs a width by height pixel ellipse, centered at (0,0) on canvas.QCanvasEllipse::QCanvasEllipse ( int width, int height, int startangle, int angle, QCanvas * canvas )
Constructs a width by height pixel ellipse, centered at (0,0) on canvas. Only a segment of the ellipse is drawn, starting at angle startangle, and extending for angle angle (the angle length).Note that angles are specified in 1/16ths of a degree.
QCanvasEllipse::~QCanvasEllipse ()
Destroys the ellipse.int QCanvasEllipse::angleLength () const
Returns the length angle (the extent of the ellipse segment) in 16ths of a degree. Initially this will be 360 * 16 (a complete ellipse).
See also setAngles() and angleStart().
int QCanvasEllipse::angleStart () const
Returns the start angle in 16ths of a degree. Initially this will be 0.
See also setAngles() and angleLength().
void QCanvasEllipse::drawShape ( QPainter & p ) [virtual protected]
Draws the ellipse, centered at x(), y() using the painter p.Note that QCanvasEllipse does not support an outline (pen is always NoPen).
Reimplemented from QCanvasPolygonalItem.
int QCanvasEllipse::height () const
Returns the height of the ellipse.int QCanvasEllipse::rtti () const [virtual]
Returns 6 (QCanvasItem::Rtti_Ellipse).
See also QCanvasItem::rtti().
Reimplemented from QCanvasPolygonalItem.
void QCanvasEllipse::setAngles ( int start, int length )
Sets the angles for the ellipse. The start angle is start and the extent of the segment is length (the angle length) from the start. The angles are specified in 16ths of a degree. By default the ellipse will start at 0 and have an angle length of 360 * 16 (a complete ellipse).
See also angleStart() and angleLength().
void QCanvasEllipse::setSize ( int width, int height )
Sets the width and height of the ellipse.int QCanvasEllipse::width () const
Returns the width of the ellipse.This file is part of the Qt toolkit. Copyright © 1995-2002 Trolltech. All Rights Reserved.
Copyright © 2002 Trolltech | Trademarks | Qt version 3.0.5
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