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122 lines
5.7 KiB
122 lines
5.7 KiB
13 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/canvas/qcanvas.cpp:4227 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>TQCanvasSpline Class</title>
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<font color="#004faf">All Classes</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQCanvasSpline Class Reference<br><small>[<a href="canvas.html">canvas module</a>]</small></h1>
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<p>The TQCanvasSpline class provides multi-bezier splines on a TQCanvas.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qcanvas-h.html">qcanvas.h</a>></tt>
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<p>Inherits <a href="qcanvaspolygon.html">TQCanvasPolygon</a>.
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<p><a href="qcanvasspline-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQCanvasSpline"><b>TQCanvasSpline</b></a> ( TQCanvas * canvas )</li>
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<li class=fn><a href="#~TQCanvasSpline"><b>~TQCanvasSpline</b></a> ()</li>
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<li class=fn>void <a href="#setControlPoints"><b>setControlPoints</b></a> ( TQPointArray ctrl, bool close = TRUE )</li>
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<li class=fn>TQPointArray <a href="#controlPoints"><b>controlPoints</b></a> () const</li>
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<li class=fn>bool <a href="#closed"><b>closed</b></a> () const</li>
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<li class=fn>virtual int <a href="#rtti"><b>rtti</b></a> () const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQCanvasSpline class provides multi-bezier splines on a <a href="qcanvas.html">TQCanvas</a>.
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<p>
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<p> A TQCanvasSpline is a sequence of 4-point bezier curves joined
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together to make a curved shape.
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<p> You set the control points of the spline with <a href="#setControlPoints">setControlPoints</a>().
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<p> If the bezier is <a href="#closed">closed</a>(), then the first control point will be
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re-used as the last control point. Therefore, a closed bezier must
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have a multiple of 3 control points and an open bezier must have
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one extra point.
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<p> The beziers are not necessarily joined "smoothly". To ensure this,
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set control points appropriately (general reference texts about
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beziers will explain this in detail).
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<p> Like any other canvas item splines can be moved with
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<a href="qcanvasitem.html#move">TQCanvasItem::move</a>() and <a href="qcanvasitem.html#moveBy">TQCanvasItem::moveBy</a>(), or by setting
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coordinates with <a href="qcanvasitem.html#setX">TQCanvasItem::setX</a>(), <a href="qcanvasitem.html#setY">TQCanvasItem::setY</a>() and
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<a href="qcanvasitem.html#setZ">TQCanvasItem::setZ</a>().
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<p> <p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQCanvasSpline"></a>TQCanvasSpline::TQCanvasSpline ( <a href="qcanvas.html">TQCanvas</a> * canvas )
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</h3>
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Create a spline with no control points on the canvas <em>canvas</em>.
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<p> <p>See also <a href="#setControlPoints">setControlPoints</a>().
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<h3 class=fn><a name="~TQCanvasSpline"></a>TQCanvasSpline::~TQCanvasSpline ()
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</h3>
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Destroy the spline.
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<h3 class=fn>bool <a name="closed"></a>TQCanvasSpline::closed () const
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</h3>
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Returns TRUE if the control points are a closed set; otherwise
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returns FALSE.
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<h3 class=fn><a href="qpointarray.html">TQPointArray</a> <a name="controlPoints"></a>TQCanvasSpline::controlPoints () const
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</h3>
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Returns the current set of control points.
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<p> <p>See also <a href="#setControlPoints">setControlPoints</a>() and <a href="#closed">closed</a>().
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<h3 class=fn>int <a name="rtti"></a>TQCanvasSpline::rtti () const<tt> [virtual]</tt>
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</h3>
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Returns 8 (TQCanvasItem::Rtti_Spline).
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<p> <p>See also <a href="qcanvasitem.html#rtti">TQCanvasItem::rtti</a>().
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<p>Reimplemented from <a href="qcanvaspolygon.html#rtti">TQCanvasPolygon</a>.
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<h3 class=fn>void <a name="setControlPoints"></a>TQCanvasSpline::setControlPoints ( <a href="qpointarray.html">TQPointArray</a> ctrl, bool close = TRUE )
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</h3>
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Set the spline control points to <em>ctrl</em>.
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<p> If <em>close</em> is TRUE, then the first point in <em>ctrl</em> will be
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re-used as the last point, and the number of control points must
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be a multiple of 3. If <em>close</em> is FALSE, one additional control
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point is retquired, and the number of control points must be one of
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(4, 7, 10, 13, ...).
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<p> If the number of control points doesn't meet the above conditions,
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the number of points will be truncated to the largest number of
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points that do meet the retquirement.
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<p>Example: <a href="canvas-example.html#x2926">canvas/canvas.cpp</a>.
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<!-- eof -->
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<hr><p>
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This file is part of the <a href="index.html">TQt toolkit</a>.
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Copyright © 1995-2007
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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