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<a href="#pub-methods">Public Member Functions</a> |
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<a href="#pub-static-methods">Static Public Member Functions</a> |
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<a href="class_qwt_bezier-members.html">List of all members</a> </div>
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<div class="title">QwtBezier Class Reference</div> </div>
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<div class="contents">
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<p>An implementation of the de Casteljau’s Algorithm for interpolating Bézier curves.
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<a href="class_qwt_bezier.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="qwt__bezier_8h_source.html">qwt_bezier.h</a>></code></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:a7b74d8e4874bc39110c84f74594d61b9"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_bezier.html#a7b74d8e4874bc39110c84f74594d61b9">QwtBezier</a> (double <a class="el" href="class_qwt_bezier.html#a53b980b7397ef4bdcbc011d6556108b8">tolerance</a>=0.5)</td></tr>
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||
<tr class="memdesc:a7b74d8e4874bc39110c84f74594d61b9"><td class="mdescLeft"> </td><td class="mdescRight">Constructor. <a href="class_qwt_bezier.html#a7b74d8e4874bc39110c84f74594d61b9">More...</a><br /></td></tr>
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<tr class="separator:a7b74d8e4874bc39110c84f74594d61b9"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a750ad26d6b7a3c37685f03db98868d3f"><td class="memItemLeft" align="right" valign="top"><a id="a750ad26d6b7a3c37685f03db98868d3f"></a>
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 </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_bezier.html#a750ad26d6b7a3c37685f03db98868d3f">~QwtBezier</a> ()</td></tr>
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||
<tr class="memdesc:a750ad26d6b7a3c37685f03db98868d3f"><td class="mdescLeft"> </td><td class="mdescRight">Destructor. <br /></td></tr>
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||
<tr class="separator:a750ad26d6b7a3c37685f03db98868d3f"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a5c0ad844ea7d4ee69f3c391fd1a93ae7"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_bezier.html#a5c0ad844ea7d4ee69f3c391fd1a93ae7">setTolerance</a> (double <a class="el" href="class_qwt_bezier.html#a53b980b7397ef4bdcbc011d6556108b8">tolerance</a>)</td></tr>
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<tr class="separator:a5c0ad844ea7d4ee69f3c391fd1a93ae7"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a53b980b7397ef4bdcbc011d6556108b8"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_bezier.html#a53b980b7397ef4bdcbc011d6556108b8">tolerance</a> () const</td></tr>
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||
<tr class="separator:a53b980b7397ef4bdcbc011d6556108b8"><td class="memSeparator" colspan="2"> </td></tr>
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||
<tr class="memitem:a1cac7efebcc8bf42fe9a12552a9d727d"><td class="memItemLeft" align="right" valign="top">QPolygonF </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_bezier.html#a1cac7efebcc8bf42fe9a12552a9d727d">toPolygon</a> (const QPointF &p1, const QPointF &cp1, const QPointF &cp2, const QPointF &p2) const</td></tr>
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||
<tr class="memdesc:a1cac7efebcc8bf42fe9a12552a9d727d"><td class="mdescLeft"> </td><td class="mdescRight">Interpolate a Bézier curve by a polygon. <a href="class_qwt_bezier.html#a1cac7efebcc8bf42fe9a12552a9d727d">More...</a><br /></td></tr>
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||
<tr class="separator:a1cac7efebcc8bf42fe9a12552a9d727d"><td class="memSeparator" colspan="2"> </td></tr>
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||
<tr class="memitem:a1e67390b7109a819d29b043418bcb1b5"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_bezier.html#a1e67390b7109a819d29b043418bcb1b5">appendToPolygon</a> (const QPointF &p1, const QPointF &cp1, const QPointF &cp2, const QPointF &p2, QPolygonF &polygon) const</td></tr>
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<tr class="memdesc:a1e67390b7109a819d29b043418bcb1b5"><td class="mdescLeft"> </td><td class="mdescRight">Interpolate a Bézier curve by a polygon. <a href="class_qwt_bezier.html#a1e67390b7109a819d29b043418bcb1b5">More...</a><br /></td></tr>
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<tr class="separator:a1e67390b7109a819d29b043418bcb1b5"><td class="memSeparator" colspan="2"> </td></tr>
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||
</table><table class="memberdecls">
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||
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-static-methods"></a>
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Static Public Member Functions</h2></td></tr>
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||
<tr class="memitem:a962c356b89fb7fd2343091fed1569530"><td class="memItemLeft" align="right" valign="top">static QPointF </td><td class="memItemRight" valign="bottom"><a class="el" href="class_qwt_bezier.html#a962c356b89fb7fd2343091fed1569530">pointAt</a> (const QPointF &p1, const QPointF &cp1, const QPointF &cp2, const QPointF &p2, double t)</td></tr>
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<tr class="separator:a962c356b89fb7fd2343091fed1569530"><td class="memSeparator" colspan="2"> </td></tr>
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||
</table>
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||
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>An implementation of the de Casteljau’s Algorithm for interpolating Bézier curves. </p>
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<p>The flatness criterion for terminating the subdivision is based on "Piecewise Linear Approximation of Bézier Curves" by Roger Willcocks ( <a href="http://www.rops.org">http://www.rops.org</a> )</p>
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||
<p>This article explains the maths behind in a very nice way: <a href="https://jeremykun.com/2013/05/11/bezier-curves-and-picasso">https://jeremykun.com/2013/05/11/bezier-curves-and-picasso</a> </p>
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<p class="definition">Definition at line <a class="el" href="qwt__bezier_8h_source.html#l00029">29</a> of file <a class="el" href="qwt__bezier_8h_source.html">qwt_bezier.h</a>.</p>
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||
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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||
<a id="a7b74d8e4874bc39110c84f74594d61b9"></a>
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||
<h2 class="memtitle"><span class="permalink"><a href="#a7b74d8e4874bc39110c84f74594d61b9">◆ </a></span>QwtBezier()</h2>
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||
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">QwtBezier::QwtBezier </td>
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||
<td>(</td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>tolerance</em> = <code>0.5</code></td><td>)</td>
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||
<td></td>
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||
</tr>
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||
</table>
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</div><div class="memdoc">
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<p>Constructor. </p>
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||
<dl class="params"><dt>Parameters</dt><dd>
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||
<table class="params">
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||
<tr><td class="paramname">tolerance</td><td>Termination criterion for the subdivision </td></tr>
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||
</table>
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||
</dd>
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||
</dl>
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||
<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_bezier.html#a5c0ad844ea7d4ee69f3c391fd1a93ae7">setTolerance()</a> </dd></dl>
|
||
|
||
<p class="definition">Definition at line <a class="el" href="qwt__bezier_8cpp_source.html#l00116">116</a> of file <a class="el" href="qwt__bezier_8cpp_source.html">qwt_bezier.cpp</a>.</p>
|
||
|
||
</div>
|
||
</div>
|
||
<h2 class="groupheader">Member Function Documentation</h2>
|
||
<a id="a1e67390b7109a819d29b043418bcb1b5"></a>
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||
<h2 class="memtitle"><span class="permalink"><a href="#a1e67390b7109a819d29b043418bcb1b5">◆ </a></span>appendToPolygon()</h2>
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||
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">void QwtBezier::appendToPolygon </td>
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<td>(</td>
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<td class="paramtype">const QPointF & </td>
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<td class="paramname"><em>p1</em>, </td>
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</tr>
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<tr>
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||
<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const QPointF & </td>
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<td class="paramname"><em>cp1</em>, </td>
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</tr>
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<tr>
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||
<td class="paramkey"></td>
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||
<td></td>
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||
<td class="paramtype">const QPointF & </td>
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<td class="paramname"><em>cp2</em>, </td>
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||
</tr>
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<tr>
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||
<td class="paramkey"></td>
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||
<td></td>
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||
<td class="paramtype">const QPointF & </td>
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<td class="paramname"><em>p2</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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||
<td class="paramtype">QPolygonF & </td>
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<td class="paramname"><em>polygon</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td> const</td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Interpolate a Bézier curve by a polygon. </p>
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||
<p><a class="el" href="class_qwt_bezier.html#a1e67390b7109a819d29b043418bcb1b5" title="Interpolate a Bézier curve by a polygon.">appendToPolygon()</a> is tailored for cumulating points from a sequence of bezier curves like being created by a spline interpolation.</p>
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||
<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">p1</td><td>Start point </td></tr>
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||
<tr><td class="paramname">cp1</td><td>First control point </td></tr>
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<tr><td class="paramname">cp2</td><td>Second control point </td></tr>
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<tr><td class="paramname">p2</td><td>End point </td></tr>
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<tr><td class="paramname">polygon</td><td>Polygon, where the interpolating points are added</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section note"><dt>Note</dt><dd>If the last point of the incoming polygon matches p1 it won't be inserted a second time. </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__bezier_8cpp_source.html#l00186">186</a> of file <a class="el" href="qwt__bezier_8cpp_source.html">qwt_bezier.cpp</a>.</p>
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|
||
</div>
|
||
</div>
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||
<a id="a962c356b89fb7fd2343091fed1569530"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a962c356b89fb7fd2343091fed1569530">◆ </a></span>pointAt()</h2>
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<div class="memitem">
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<div class="memproto">
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<tr>
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<td class="mlabels-left">
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<table class="memname">
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<tr>
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<td class="memname">QPointF QwtBezier::pointAt </td>
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<td>(</td>
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<td class="paramtype">const QPointF & </td>
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<td class="paramname"><em>p1</em>, </td>
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</tr>
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||
<tr>
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||
<td class="paramkey"></td>
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||
<td></td>
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<td class="paramtype">const QPointF & </td>
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<td class="paramname"><em>cp1</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const QPointF & </td>
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<td class="paramname"><em>cp2</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">const QPointF & </td>
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<td class="paramname"><em>p2</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>t</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</td>
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<td class="mlabels-right">
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Find a point on a Bézier Curve</p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">p1</td><td>Start point </td></tr>
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<tr><td class="paramname">cp1</td><td>First control point </td></tr>
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<tr><td class="paramname">cp2</td><td>Second control point </td></tr>
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<tr><td class="paramname">p2</td><td>End point </td></tr>
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<tr><td class="paramname">t</td><td>Parameter value, something between [0,1]</td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>Point on the curve </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__bezier_8cpp_source.html#l00239">239</a> of file <a class="el" href="qwt__bezier_8cpp_source.html">qwt_bezier.cpp</a>.</p>
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</div>
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</div>
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<a id="a5c0ad844ea7d4ee69f3c391fd1a93ae7"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a5c0ad844ea7d4ee69f3c391fd1a93ae7">◆ </a></span>setTolerance()</h2>
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<div class="memitem">
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<div class="memproto">
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<tr>
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<td class="memname">void QwtBezier::setTolerance </td>
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<td>(</td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>tolerance</em></td><td>)</td>
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<td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Set the tolerance</p>
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<p>The tolerance is a measurement for the flatness of a curve. A curve with a flatness below the tolerance is considered as being flat terminating the subdivision algorithm.</p>
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<p>When interpolating a Bezier curve to render it as a sequence of lines to some sort of raster ( f.e to screen ) a value of 0.5 of the pixel size is a good value for the tolerance.</p>
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||
<dl class="params"><dt>Parameters</dt><dd>
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||
<table class="params">
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<tr><td class="paramname">tolerance</td><td>Termination criterion for the subdivision </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_bezier.html#a53b980b7397ef4bdcbc011d6556108b8">tolerance()</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__bezier_8cpp_source.html#l00141">141</a> of file <a class="el" href="qwt__bezier_8cpp_source.html">qwt_bezier.cpp</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a53b980b7397ef4bdcbc011d6556108b8">◆ </a></span>tolerance()</h2>
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<td class="memname">double QwtBezier::tolerance </td>
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<td>(</td>
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<td class="paramname"></td><td>)</td>
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<td> const</td>
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<span class="mlabels"><span class="mlabel">inline</span></span> </td>
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<dl class="section return"><dt>Returns</dt><dd>Tolerance, that is used as criterion for the subdivision </dd></dl>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="class_qwt_bezier.html#a5c0ad844ea7d4ee69f3c391fd1a93ae7">setTolerance()</a> </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__bezier_8h_source.html#l00056">56</a> of file <a class="el" href="qwt__bezier_8h_source.html">qwt_bezier.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a1cac7efebcc8bf42fe9a12552a9d727d">◆ </a></span>toPolygon()</h2>
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<td class="memname">QPolygonF QwtBezier::toPolygon </td>
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<td class="paramtype">const QPointF & </td>
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<td class="paramname"><em>p1</em>, </td>
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<p>Interpolate a Bézier curve by a polygon. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<tr><td class="paramname">p1</td><td>Start point </td></tr>
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<tr><td class="paramname">cp1</td><td>First control point </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>Interpolating polygon </dd></dl>
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<p class="definition">Definition at line <a class="el" href="qwt__bezier_8cpp_source.html#l00157">157</a> of file <a class="el" href="qwt__bezier_8cpp_source.html">qwt_bezier.cpp</a>.</p>
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