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122 lines
5.7 KiB
122 lines
5.7 KiB
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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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<title>QCanvasSpline Class</title>
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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>QCanvasSpline Class Reference<br><small>[<a href="canvas.html">canvas module</a>]</small></h1>
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<p>The QCanvasSpline class provides multi-bezier splines on a QCanvas.
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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">QCanvasPolygon</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="#QCanvasSpline"><b>QCanvasSpline</b></a> ( QCanvas * canvas )</li>
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<li class=fn><a href="#~QCanvasSpline"><b>~QCanvasSpline</b></a> ()</li>
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<li class=fn>void <a href="#setControlPoints"><b>setControlPoints</b></a> ( QPointArray ctrl, bool close = TRUE )</li>
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<li class=fn>QPointArray <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 QCanvasSpline class provides multi-bezier splines on a <a href="qcanvas.html">QCanvas</a>.
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<p>
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<p> A QCanvasSpline 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">QCanvasItem::move</a>() and <a href="qcanvasitem.html#moveBy">QCanvasItem::moveBy</a>(), or by setting
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coordinates with <a href="qcanvasitem.html#setX">QCanvasItem::setX</a>(), <a href="qcanvasitem.html#setY">QCanvasItem::setY</a>() and
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<a href="qcanvasitem.html#setZ">QCanvasItem::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="QCanvasSpline"></a>QCanvasSpline::QCanvasSpline ( <a href="qcanvas.html">QCanvas</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="~QCanvasSpline"></a>QCanvasSpline::~QCanvasSpline ()
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</h3>
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Destroy the spline.
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<h3 class=fn>bool <a name="closed"></a>QCanvasSpline::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">QPointArray</a> <a name="controlPoints"></a>QCanvasSpline::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>QCanvasSpline::rtti () const<tt> [virtual]</tt>
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</h3>
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Returns 8 (QCanvasItem::Rtti_Spline).
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<p> <p>See also <a href="qcanvasitem.html#rtti">QCanvasItem::rtti</a>().
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<p>Reimplemented from <a href="qcanvaspolygon.html#rtti">QCanvasPolygon</a>.
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<h3 class=fn>void <a name="setControlPoints"></a>QCanvasSpline::setControlPoints ( <a href="qpointarray.html">QPointArray</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 required, 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 requirement.
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<p>Example: <a href="canvas-example.html#x2926">canvas/canvas.cpp</a>.
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