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| <div class="section"> |
| <div class="titlepage"><div><div><h4 class="title"> |
| <a name="geometry.reference.core.point_order"></a><a class="link" href="point_order.html" title="point_order">point_order</a> |
| </h4></div></div></div> |
| <p> |
| <a class="indexterm" name="idp122178592"></a> |
| Metafunction defining <span class="bold"><strong>value</strong></span> as the point |
| order (clockwise, counterclockwise) of the specified geometry type. |
| </p> |
| <h6> |
| <a name="geometry.reference.core.point_order.h0"></a> |
| <span class="phrase"><a name="geometry.reference.core.point_order.synopsis"></a></span><a class="link" href="point_order.html#geometry.reference.core.point_order.synopsis">Synopsis</a> |
| </h6> |
| <p> |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Geometry</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">point_order</span> |
| <span class="special">{</span> |
| <span class="comment">// ...</span> |
| <span class="special">};</span> |
| </pre> |
| <p> |
| </p> |
| <h6> |
| <a name="geometry.reference.core.point_order.h1"></a> |
| <span class="phrase"><a name="geometry.reference.core.point_order.template_parameter_s_"></a></span><a class="link" href="point_order.html#geometry.reference.core.point_order.template_parameter_s_">Template |
| parameter(s)</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Parameter |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| </tr></thead> |
| <tbody><tr> |
| <td> |
| <p> |
| typename Geometry |
| </p> |
| </td> |
| <td> |
| <p> |
| Any type fulfilling a Geometry Concept |
| </p> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <h6> |
| <a name="geometry.reference.core.point_order.h2"></a> |
| <span class="phrase"><a name="geometry.reference.core.point_order.header"></a></span><a class="link" href="point_order.html#geometry.reference.core.point_order.header">Header</a> |
| </h6> |
| <p> |
| Either |
| </p> |
| <p> |
| <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> |
| </p> |
| <p> |
| Or |
| </p> |
| <p> |
| <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">core</span><span class="special">/</span><span class="identifier">point_order</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> |
| </p> |
| <div class="note"><table border="0" summary="Note"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td> |
| <th align="left">Note</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| The point order is defined for any geometry type, but only has a real |
| meaning for areal geometry types (ring, polygon, multi_polygon) |
| </p></td></tr> |
| </table></div> |
| <h6> |
| <a name="geometry.reference.core.point_order.h3"></a> |
| <span class="phrase"><a name="geometry.reference.core.point_order.complexity"></a></span><a class="link" href="point_order.html#geometry.reference.core.point_order.complexity">Complexity</a> |
| </h6> |
| <p> |
| Compile time |
| </p> |
| <h6> |
| <a name="geometry.reference.core.point_order.h4"></a> |
| <span class="phrase"><a name="geometry.reference.core.point_order.example"></a></span><a class="link" href="point_order.html#geometry.reference.core.point_order.example">Example</a> |
| </h6> |
| <p> |
| Examine the expected point order of a polygon type |
| </p> |
| <p> |
| </p> |
| <pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span> |
| |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">geometries</span><span class="special">/</span><span class="identifier">polygon</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">geometry</span><span class="special">/</span><span class="identifier">geometries</span><span class="special">/</span><span class="identifier">point_xy</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| |
| <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span> |
| <span class="special">{</span> |
| <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">d2</span><span class="special">::</span><span class="identifier">point_xy</span><span class="special"><</span><span class="keyword">double</span><span class="special">></span> <span class="identifier">point_type</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">model</span><span class="special">::</span><span class="identifier">polygon</span><span class="special"><</span><span class="identifier">point_type</span><span class="special">,</span> <span class="keyword">false</span><span class="special">></span> <span class="identifier">polygon_type</span><span class="special">;</span> |
| |
| <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">order_selector</span> <span class="identifier">order</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">point_order</span><span class="special"><</span><span class="identifier">polygon_type</span><span class="special">>::</span><span class="identifier">value</span><span class="special">;</span> |
| |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"order: "</span> <span class="special"><<</span> <span class="identifier">order</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span> |
| <span class="special"><<</span> <span class="string">"(clockwise = "</span> <span class="special"><<</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">clockwise</span> |
| <span class="special"><<</span> <span class="string">", counterclockwise = "</span> <span class="special"><<</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">geometry</span><span class="special">::</span><span class="identifier">counterclockwise</span> |
| <span class="special"><<</span> <span class="string">") "</span><span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> |
| |
| <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span> |
| <span class="special">}</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| Output: |
| </p> |
| <pre class="programlisting">order: 2 |
| (clockwise = 1, counterclockwise = 2) |
| </pre> |
| <h6> |
| <a name="geometry.reference.core.point_order.h5"></a> |
| <span class="phrase"><a name="geometry.reference.core.point_order.see_also"></a></span><a class="link" href="point_order.html#geometry.reference.core.point_order.see_also">See |
| also</a> |
| </h6> |
| <div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"> |
| <a class="link" href="../enumerations/order_selector.html" title="order_selector">The |
| order_selector enumeration</a> |
| </li></ul></div> |
| </div> |
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| <td align="left"></td> |
| <td align="right"><div class="copyright-footer">Copyright © 2009-2015 Barend Gehrels, Bruno Lalande, |
| Mateusz Loskot, Adam Wulkiewicz, Oracle and/or its affiliates<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
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