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103 lines
3.8 KiB
103 lines
3.8 KiB
'\" t
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.TH QCanvasSpline 3qt "2 February 2007" "Trolltech AS" \" -*- nroff -*-
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.\" Copyright 1992-2007 Trolltech ASA. All rights reserved. See the
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.\" license file included in the distribution for a complete license
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.\" statement.
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.\"
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.ad l
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.nh
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.SH NAME
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QCanvasSpline \- Multi-bezier splines on a QCanvas
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.SH SYNOPSIS
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\fC#include <qcanvas.h>\fR
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.PP
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Inherits QCanvasPolygon.
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.PP
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.SS "Public Members"
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.in +1c
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.ti -1c
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.BI "\fBQCanvasSpline\fR ( QCanvas * canvas )"
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.br
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.ti -1c
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.BI "\fB~QCanvasSpline\fR ()"
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.br
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.ti -1c
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.BI "void \fBsetControlPoints\fR ( QPointArray ctrl, bool close = TRUE )"
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.br
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.ti -1c
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.BI "QPointArray \fBcontrolPoints\fR () const"
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.br
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.ti -1c
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.BI "bool \fBclosed\fR () const"
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.br
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.ti -1c
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.BI "virtual int \fBrtti\fR () const"
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.br
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.in -1c
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.SH DESCRIPTION
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The QCanvasSpline class provides multi-bezier splines on a QCanvas.
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.PP
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A QCanvasSpline is a sequence of 4-point bezier curves joined together to make a curved shape.
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.PP
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You set the control points of the spline with setControlPoints().
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.PP
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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.
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.PP
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The beziers are not necessarily joined "smoothly". To ensure this, set control points appropriately (general reference texts about beziers will explain this in detail).
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.PP
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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().
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.PP
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See also Graphics Classes and Image Processing Classes.
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.SH MEMBER FUNCTION DOCUMENTATION
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.SH "QCanvasSpline::QCanvasSpline ( QCanvas * canvas )"
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Create a spline with no control points on the canvas \fIcanvas\fR.
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.PP
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See also setControlPoints().
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.SH "QCanvasSpline::~QCanvasSpline ()"
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Destroy the spline.
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.SH "bool QCanvasSpline::closed () const"
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Returns TRUE if the control points are a closed set; otherwise returns FALSE.
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.SH "QPointArray QCanvasSpline::controlPoints () const"
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Returns the current set of control points.
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.PP
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See also setControlPoints() and closed().
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.SH "int QCanvasSpline::rtti () const\fC [virtual]\fR"
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Returns 8 (QCanvasItem::Rtti_Spline).
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.PP
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See also QCanvasItem::rtti().
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.PP
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Reimplemented from QCanvasPolygon.
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.SH "void QCanvasSpline::setControlPoints ( QPointArray ctrl, bool close = TRUE )"
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Set the spline control points to \fIctrl\fR.
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.PP
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If \fIclose\fR is TRUE, then the first point in \fIctrl\fR will be re-used as the last point, and the number of control points must be a multiple of 3. If \fIclose\fR is FALSE, one additional control point is required, and the number of control points must be one of (4, 7, 10, 13, ...).
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.PP
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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.
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.PP
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Example: canvas/canvas.cpp.
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.SH "SEE ALSO"
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.BR http://doc.trolltech.com/qcanvasspline.html
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.BR http://www.trolltech.com/faq/tech.html
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.SH COPYRIGHT
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Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
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license file included in the distribution for a complete license
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statement.
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.SH AUTHOR
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Generated automatically from the source code.
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.SH BUGS
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If you find a bug in Qt, please report it as described in
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.BR http://doc.trolltech.com/bughowto.html .
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Good bug reports help us to help you. Thank you.
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.P
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The definitive Qt documentation is provided in HTML format; it is
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located at $QTDIR/doc/html and can be read using Qt Assistant or with
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a web browser. This man page is provided as a convenience for those
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users who prefer man pages, although this format is not officially
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supported by Trolltech.
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.P
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If you find errors in this manual page, please report them to
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.BR qt-bugs@trolltech.com .
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Please include the name of the manual page (qcanvasspline.3qt) and the Qt
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version (3.3.8).
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