ceph/src/boost/libs/polygon/doc/gtl_point_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; //constructing a gtl point<br>
  23 &nbsp; typedef gtl::point_data&lt;int&gt; Point;<br>
  24 &nbsp; int x = 10;<br>
  25 &nbsp; int y = 20;<br>
  26 &nbsp; Point pt(x, y);<br>
  27 &nbsp; assert(gtl::x(pt) == 10);<br>
  28 &nbsp; assert(gtl::y(pt) == 20);<br>
  29 &nbsp; <br>
  30 &nbsp; //a quick primer in isotropic point access<br>
  31 &nbsp; typedef gtl::orientation_2d O;<br>
  32 &nbsp; using gtl::HORIZONTAL;<br>
  33 &nbsp; using gtl::VERTICAL;<br>
  34 &nbsp; O o = HORIZONTAL;<br>
  35 &nbsp; assert(gtl::x(pt) == gtl::get(pt, o));<br>
  36 &nbsp; <br>
  37 &nbsp; o = o.get_perpendicular();<br>
  38 &nbsp; assert(o == VERTICAL);<br>
  39 &nbsp; assert(gtl::y(pt) == gtl::get(pt, o));<br>
  40 <br>
  41 &nbsp; gtl::set(pt, o, 30);<br>
  42 &nbsp; assert(gtl::y(pt) == 30);<br>
  43 <br>
  44 &nbsp; //using some of the library functions<br>
  45 &nbsp; Point pt2(10, 30);<br>
  46 &nbsp; assert(gtl::equivalence(pt, pt2));<br>
  47 <br>
  48 &nbsp; gtl::transformation&lt;int&gt; tr(gtl::axis_transformation::SWAP_XY);<br>
  49 &nbsp; gtl::transform(pt, tr);<br>
  50 &nbsp; assert(gtl::equivalence(pt, Point(30, 10)));<br>
  51 <br>
  52 &nbsp; gtl::transformation&lt;int&gt; tr2 = tr.inverse();<br>
  53 &nbsp; assert(tr == tr2); //SWAP_XY is its own inverse transform<br>
  54 <br>
  55 &nbsp; gtl::transform(pt, tr2);<br>
  56 &nbsp; assert(gtl::equivalence(pt, pt2)); //the two points are equal again<br>
  57 <br>
  58 &nbsp; gtl::move(pt, o, 10); //move pt 10 units in y<br>
  59 &nbsp; assert(gtl::euclidean_distance(pt, pt2) == 10.0f);<br>
  60 <br>
  61 &nbsp; gtl::move(pt, o.get_perpendicular(), 10); //move pt 10 units in x<br>
  62 &nbsp; assert(gtl::manhattan_distance(pt, pt2) == 20);<br>
  63 <br>
  64 &nbsp; return 0;<br>
  65 }<br>
  66 &nbsp;</font></p>
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  69 <table class="docinfo" rules="none" frame="void" id="table1">
  70         <colgroup>
  71                 <col class="docinfo-name"><col class="docinfo-content">
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  74                 <tr>
  75                         <th class="docinfo-name">Copyright:</th>
  76                         <td>Copyright © Intel Corporation 2008-2010.</td>
  77                 </tr>
  78                 <tr class="field">
  79                         <th class="docinfo-name">License:</th>
  80                         <td class="field-body">Distributed under the Boost Software License,
  81                         Version 1.0. (See accompanying file <tt class="literal">
  82                         <span class="pre">LICENSE_1_0.txt</span></tt> or copy at
  83                         <a class="reference" target="_top" href="http://www.boost.org/LICENSE_1_0.txt">
  84                         http://www.boost.org/LICENSE_1_0.txt</a>)</td>
  85                 </tr>
  86 </table>
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