QCanvasSpline(3qt)QCanvasSpline(3qt)NAME
QCanvasSpline - Multi-bezier splines on a QCanvas
SYNOPSIS
#include <qcanvas.h>
Inherits QCanvasPolygon.
Public Members
QCanvasSpline ( QCanvas * canvas )
~QCanvasSpline ()
void setControlPoints ( QPointArray ctrl, bool close = TRUE )
QPointArray controlPoints () const
bool closed () const
virtual int rtti () const
DESCRIPTION
The QCanvasSpline class provides multi-bezier splines on a QCanvas.
A QCanvasSpline is a sequence of 4-point bezier curves joined together
to make a curved shape.
You set the control points of the spline with setControlPoints().
If the bezier is closed(), then the first control point will be re-used
as the last control point. Therefore, a closed bezier must have a
multiple of 3 control points and an open bezier must have one extra
point.
The beziers are not necessarily joined "smoothly". To ensure this, set
control points appropriately (general reference texts about beziers
will explain this in detail).
Like any other canvas item splines can be moved with
QCanvasItem::move() and QCanvasItem::moveBy(), or by setting
coordinates with QCanvasItem::setX(), QCanvasItem::setY() and
QCanvasItem::setZ().
See also Graphics Classes and Image Processing Classes.
MEMBER FUNCTION DOCUMENTATIONQCanvasSpline::QCanvasSpline ( QCanvas * canvas )
Create a spline with no control points on the canvas canvas.
See also setControlPoints().
QCanvasSpline::~QCanvasSpline ()
Destroy the spline.
bool QCanvasSpline::closed () const
Returns TRUE if the control points are a closed set; otherwise returns
FALSE.
QPointArray QCanvasSpline::controlPoints () const
Returns the current set of control points.
See also setControlPoints() and closed().
int QCanvasSpline::rtti () const [virtual]
Returns 8 (QCanvasItem::Rtti_Spline).
See also QCanvasItem::rtti().
Reimplemented from QCanvasPolygon.
void QCanvasSpline::setControlPoints ( QPointArray ctrl, bool close = TRUE )
Set the spline control points to ctrl.
If close is TRUE, then the first point in ctrl will be re-used as the
last point, and the number of control points must be a multiple of 3.
If close is FALSE, one additional control point is required, and the
number of control points must be one of (4, 7, 10, 13, ...).
If the number of control points doesn't meet the above conditions, the
number of points will be truncated to the largest number of points that
do meet the requirement.
Example: canvas/canvas.cpp.
SEE ALSO
http://doc.trolltech.com/qcanvasspline.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
license file included in the distribution for a complete license
statement.
AUTHOR
Generated automatically from the source code.
BUGS
If you find a bug in Qt, please report it as described in
http://doc.trolltech.com/bughowto.html. Good bug reports help us to
help you. Thank you.
The definitive Qt documentation is provided in HTML format; it is
located at $QTDIR/doc/html and can be read using Qt Assistant or with a
web browser. This man page is provided as a convenience for those users
who prefer man pages, although this format is not officially supported
by Trolltech.
If you find errors in this manual page, please report them to qt-
bugs@trolltech.com. Please include the name of the manual page
(qcanvasspline.3qt) and the Qt version (3.3.8).
Trolltech AS 2 February 2007 QCanvasSpline(3qt)