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| 31 | </td>
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| 32 | <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QCanvasSpline Class Reference<br><small>[<a href="canvas.html">canvas module</a>]</small></h1>
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| 33 |
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| 34 | <p>The QCanvasSpline class provides multi-bezier splines on a QCanvas.
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| 35 | <a href="#details">More...</a>
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| 36 | <p><tt>#include <<a href="qcanvas-h.html">qcanvas.h</a>></tt>
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| 37 | <p>Inherits <a href="qcanvaspolygon.html">QCanvasPolygon</a>.
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| 38 | <p><a href="qcanvasspline-members.html">List of all member functions.</a>
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| 39 | <h2>Public Members</h2>
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| 40 | <ul>
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| 41 | <li class=fn><a href="#QCanvasSpline"><b>QCanvasSpline</b></a> ( QCanvas * canvas )</li>
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| 42 | <li class=fn><a href="#~QCanvasSpline"><b>~QCanvasSpline</b></a> ()</li>
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| 43 | <li class=fn>void <a href="#setControlPoints"><b>setControlPoints</b></a> ( QPointArray ctrl, bool close = TRUE )</li>
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| 44 | <li class=fn>QPointArray <a href="#controlPoints"><b>controlPoints</b></a> () const</li>
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| 45 | <li class=fn>bool <a href="#closed"><b>closed</b></a> () const</li>
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| 46 | <li class=fn>virtual int <a href="#rtti"><b>rtti</b></a> () const</li>
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| 47 | </ul>
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| 48 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 49 |
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| 50 |
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| 51 | The QCanvasSpline class provides multi-bezier splines on a <a href="qcanvas.html">QCanvas</a>.
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| 52 |
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| 53 | <p>
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| 54 |
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| 55 |
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| 56 | <p> A QCanvasSpline is a sequence of 4-point bezier curves joined
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| 57 | together to make a curved shape.
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| 58 | <p> You set the control points of the spline with <a href="#setControlPoints">setControlPoints</a>().
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| 59 | <p> If the bezier is <a href="#closed">closed</a>(), then the first control point will be
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| 60 | re-used as the last control point. Therefore, a closed bezier must
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| 61 | have a multiple of 3 control points and an open bezier must have
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| 62 | one extra point.
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| 63 | <p> The beziers are not necessarily joined "smoothly". To ensure this,
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| 64 | set control points appropriately (general reference texts about
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| 65 | beziers will explain this in detail).
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| 66 | <p> Like any other canvas item splines can be moved with
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| 67 | <a href="qcanvasitem.html#move">QCanvasItem::move</a>() and <a href="qcanvasitem.html#moveBy">QCanvasItem::moveBy</a>(), or by setting
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| 68 | coordinates with <a href="qcanvasitem.html#setX">QCanvasItem::setX</a>(), <a href="qcanvasitem.html#setY">QCanvasItem::setY</a>() and
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| 69 | <a href="qcanvasitem.html#setZ">QCanvasItem::setZ</a>().
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| 70 | <p> <p>See also <a href="graphics.html">Graphics Classes</a> and <a href="images.html">Image Processing Classes</a>.
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| 71 |
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| 72 | <hr><h2>Member Function Documentation</h2>
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| 73 | <h3 class=fn><a name="QCanvasSpline"></a>QCanvasSpline::QCanvasSpline ( <a href="qcanvas.html">QCanvas</a> * canvas )
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| 74 | </h3>
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| 75 | Create a spline with no control points on the canvas <em>canvas</em>.
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| 76 | <p> <p>See also <a href="#setControlPoints">setControlPoints</a>().
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| 77 |
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| 78 | <h3 class=fn><a name="~QCanvasSpline"></a>QCanvasSpline::~QCanvasSpline ()
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| 79 | </h3>
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| 80 | Destroy the spline.
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| 81 |
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| 82 | <h3 class=fn>bool <a name="closed"></a>QCanvasSpline::closed () const
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| 83 | </h3>
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| 84 | Returns TRUE if the control points are a closed set; otherwise
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| 85 | returns FALSE.
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| 86 |
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| 87 | <h3 class=fn><a href="qpointarray.html">QPointArray</a> <a name="controlPoints"></a>QCanvasSpline::controlPoints () const
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| 88 | </h3>
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| 89 | Returns the current set of control points.
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| 90 | <p> <p>See also <a href="#setControlPoints">setControlPoints</a>() and <a href="#closed">closed</a>().
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| 91 |
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| 92 | <h3 class=fn>int <a name="rtti"></a>QCanvasSpline::rtti () const<tt> [virtual]</tt>
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| 93 | </h3>
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| 94 | Returns 8 (QCanvasItem::Rtti_Spline).
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| 95 | <p> <p>See also <a href="qcanvasitem.html#rtti">QCanvasItem::rtti</a>().
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| 96 |
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| 97 | <p>Reimplemented from <a href="qcanvaspolygon.html#rtti">QCanvasPolygon</a>.
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| 98 | <h3 class=fn>void <a name="setControlPoints"></a>QCanvasSpline::setControlPoints ( <a href="qpointarray.html">QPointArray</a> ctrl, bool close = TRUE )
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| 99 | </h3>
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| 100 | Set the spline control points to <em>ctrl</em>.
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| 101 | <p> If <em>close</em> is TRUE, then the first point in <em>ctrl</em> will be
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| 102 | re-used as the last point, and the number of control points must
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| 103 | be a multiple of 3. If <em>close</em> is FALSE, one additional control
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| 104 | point is required, and the number of control points must be one of
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| 105 | (4, 7, 10, 13, ...).
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| 106 | <p> If the number of control points doesn't meet the above conditions,
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| 107 | the number of points will be truncated to the largest number of
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| 108 | points that do meet the requirement.
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| 109 |
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| 110 | <p>Example: <a href="canvas-example.html#x2926">canvas/canvas.cpp</a>.
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| 111 | <!-- eof -->
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| 112 | <hr><p>
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| 113 | This file is part of the <a href="index.html">Qt toolkit</a>.
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| 114 | Copyright © 1995-2007
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| 115 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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| 117 | <td>Copyright © 2007
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| 119 | <td align=right><div align=right>Qt 3.3.8</div>
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| 120 | </table></div></address></body>
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