ceph/src/boost/libs/polygon/doc/gtl_polygon_usage.htm

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  10 <p><font face="Courier New">/*<br>
  11 Copyright 2008 Intel Corporation<br>
  12 <br>
  13 Use, modification and distribution are subject to the Boost Software License,<br>
  14 Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at<br>
  15 http://www.boost.org/LICENSE_1_0.txt).<br>
  16 */<br>
  17 #include &lt;boost/polygon/polygon.hpp&gt;<br>
  18 #include &lt;cassert&gt;<br>
  19 namespace gtl = boost::polygon;<br>
  20 using namespace boost::polygon::operators;<br><br>
  21 int main() {<br>
  22 &nbsp;&nbsp;&nbsp; //lets construct a 10x10 rectangle shaped polygon<br>
  23 &nbsp;&nbsp;&nbsp; typedef gtl::polygon_data&lt;int&gt; Polygon;<br>
  24 &nbsp;&nbsp;&nbsp; typedef gtl::polygon_traits&lt;Polygon&gt;::point_type Point;<br>
  25 &nbsp;&nbsp;&nbsp; Point pts[] = {gtl::construct&lt;Point&gt;(0, 0),<br>
  26 &nbsp;&nbsp;&nbsp; gtl::construct&lt;Point&gt;(10, 0),<br>
  27 &nbsp;&nbsp;&nbsp; gtl::construct&lt;Point&gt;(10, 10),<br>
  28 &nbsp;&nbsp;&nbsp; gtl::construct&lt;Point&gt;(0, 10) };<br>
  29 &nbsp;&nbsp;&nbsp; Polygon poly;<br>
  30 &nbsp;&nbsp;&nbsp; gtl::set_points(poly, pts, pts+4);<br>
  31 <br>
  32 &nbsp;&nbsp;&nbsp; //now lets see what we can do with this polygon<br>
  33 &nbsp;&nbsp;&nbsp; assert(gtl::area(poly) == 100.0f);<br>
  34 &nbsp;&nbsp;&nbsp; assert(gtl::contains(poly, gtl::construct&lt;Point&gt;(5, 5)));<br>
  35 &nbsp;&nbsp;&nbsp; assert(!gtl::contains(poly, gtl::construct&lt;Point&gt;(15, 5)));<br>
  36 &nbsp;&nbsp;&nbsp; gtl::rectangle_data&lt;int&gt; rect;<br>
  37 &nbsp;&nbsp;&nbsp; assert(gtl::extents(rect, poly)); //get bounding box of poly<br>
  38 &nbsp;&nbsp;&nbsp; assert(gtl::equivalence(rect, poly)); //hey, that's slick<br>
  39 &nbsp;&nbsp;&nbsp; assert(gtl::winding(poly) == gtl::COUNTERCLOCKWISE);<br>
  40 &nbsp;&nbsp;&nbsp; assert(gtl::perimeter(poly) == 40.0f);<br>
  41 <br>
  42 &nbsp;&nbsp;&nbsp; //add 5 to all coords of poly<br>
  43 &nbsp;&nbsp;&nbsp; gtl::convolve(poly, gtl::construct&lt;Point&gt;(5, 5));<br>
  44 &nbsp;&nbsp;&nbsp; //multiply all coords of poly by 2<br>
  45 &nbsp;&nbsp;&nbsp; gtl::scale_up(poly, 2);<br>
  46 &nbsp;&nbsp;&nbsp; gtl::set_points(rect, gtl::point_data&lt;int&gt;(10, 10),<br>
  47 &nbsp;&nbsp;&nbsp; gtl::point_data&lt;int&gt;(30, 30));<br>
  48 &nbsp;&nbsp;&nbsp; assert(gtl::equivalence(poly, rect));<br>
  49 &nbsp;&nbsp;&nbsp; return 0;<br>
  50 }<br>
  51 //Now you know how to use the built in polygon data type<br>
  52 &nbsp;</font></p>
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  57                 <col class="docinfo-name"><col class="docinfo-content">
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  61                         <th class="docinfo-name">Copyright:</th>
  62                         <td>Copyright © Intel Corporation 2008-2010.</td>
  63                 </tr>
  64                 <tr class="field">
  65                         <th class="docinfo-name">License:</th>
  66                         <td class="field-body">Distributed under the Boost Software License,
  67                         Version 1.0. (See accompanying file <tt class="literal">
  68                         <span class="pre">LICENSE_1_0.txt</span></tt> or copy at
  69                         <a class="reference" target="_top" href="http://www.boost.org/LICENSE_1_0.txt">
  70                         http://www.boost.org/LICENSE_1_0.txt</a>)</td>
  71                 </tr>
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