QCanvasSpline(3qt)

1QCanvasSpline(3qt)                                          QCanvasSpline(3qt)
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NAME

6       QCanvasSpline - Multi-bezier splines on a QCanvas
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SYNOPSIS

9       #include <qcanvas.h>
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11       Inherits QCanvasPolygon.
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13   Public Members
14       QCanvasSpline ( QCanvas * canvas )
15       ~QCanvasSpline ()
16       void setControlPoints ( QPointArray ctrl, bool close = TRUE )
17       QPointArray controlPoints () const
18       bool closed () const
19       virtual int rtti () const
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DESCRIPTION

22       The QCanvasSpline class provides multi-bezier splines on a QCanvas.
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24       A QCanvasSpline is a sequence of 4-point bezier curves joined together
25       to make a curved shape.
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27       You set the control points of the spline with setControlPoints().
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29       If the bezier is closed(), then the first control point will be re-used
30       as the last control point. Therefore, a closed bezier must have a
31       multiple of 3 control points and an open bezier must have one extra
32       point.
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34       The beziers are not necessarily joined "smoothly". To ensure this, set
35       control points appropriately (general reference texts about beziers
36       will explain this in detail).
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38       Like any other canvas item splines can be moved with
39       QCanvasItem::move() and QCanvasItem::moveBy(), or by setting
40       coordinates with QCanvasItem::setX(), QCanvasItem::setY() and
41       QCanvasItem::setZ().
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43       See also Graphics Classes and Image Processing Classes.
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MEMBER FUNCTION DOCUMENTATION

QCanvasSpline::QCanvasSpline ( QCanvas * canvas )

47       Create a spline with no control points on the canvas canvas.
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49       See also setControlPoints().
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QCanvasSpline::~QCanvasSpline ()

52       Destroy the spline.
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bool QCanvasSpline::closed () const

55       Returns TRUE if the control points are a closed set; otherwise returns
56       FALSE.
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QPointArray QCanvasSpline::controlPoints () const

59       Returns the current set of control points.
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61       See also setControlPoints() and closed().
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int QCanvasSpline::rtti () const [virtual]

64       Returns 8 (QCanvasItem::Rtti_Spline).
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66       See also QCanvasItem::rtti().
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68       Reimplemented from QCanvasPolygon.
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void QCanvasSpline::setControlPoints ( QPointArray ctrl, bool close = TRUE )

71       Set the spline control points to ctrl.
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73       If close is TRUE, then the first point in ctrl will be re-used as the
74       last point, and the number of control points must be a multiple of 3.
75       If close is FALSE, one additional control point is required, and the
76       number of control points must be one of (4, 7, 10, 13, ...).
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78       If the number of control points doesn't meet the above conditions, the
79       number of points will be truncated to the largest number of points that
80       do meet the requirement.
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82       Example: canvas/canvas.cpp.
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COPYRIGHT

90       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the
91       license file included in the distribution for a complete license
92       statement.
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AUTHOR

95       Generated automatically from the source code.
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BUGS

98       If you find a bug in Qt, please report it as described in
99       http://doc.trolltech.com/bughowto.html.  Good bug reports help us to
100       help you. Thank you.
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102       The definitive Qt documentation is provided in HTML format; it is
103       located at $QTDIR/doc/html and can be read using Qt Assistant or with a
104       web browser. This man page is provided as a convenience for those users
105       who prefer man pages, although this format is not officially supported
106       by Trolltech.
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108       If you find errors in this manual page, please report them to qt-
109       bugs@trolltech.com.  Please include the name of the manual page
110       (qcanvasspline.3qt) and the Qt version (3.3.8).
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114Trolltech AS                    2 February 2007             QCanvasSpline(3qt)