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- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
- <title>Point Usage</title>
- </head>
- <body>
- <p><font face="Courier New">/*<br>
- Copyright 2008 Intel Corporation<br>
- <br>
- Use, modification and distribution are subject to the Boost Software License,<br>
- Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at<br>
- http://www.boost.org/LICENSE_1_0.txt).<br>
- */<br>
- #include <boost/polygon/polygon.hpp><br>
- #include <cassert><br>
- namespace gtl = boost::polygon;<br>
- using namespace boost::polygon::operators;<br><br>
- int main() {<br>
- //constructing a gtl point<br>
- typedef gtl::point_data<int> Point;<br>
- int x = 10;<br>
- int y = 20;<br>
- Point pt(x, y);<br>
- assert(gtl::x(pt) == 10);<br>
- assert(gtl::y(pt) == 20);<br>
- <br>
- //a quick primer in isotropic point access<br>
- typedef gtl::orientation_2d O;<br>
- using gtl::HORIZONTAL;<br>
- using gtl::VERTICAL;<br>
- O o = HORIZONTAL;<br>
- assert(gtl::x(pt) == gtl::get(pt, o));<br>
- <br>
- o = o.get_perpendicular();<br>
- assert(o == VERTICAL);<br>
- assert(gtl::y(pt) == gtl::get(pt, o));<br>
- <br>
- gtl::set(pt, o, 30);<br>
- assert(gtl::y(pt) == 30);<br>
- <br>
- //using some of the library functions<br>
- Point pt2(10, 30);<br>
- assert(gtl::equivalence(pt, pt2));<br>
- <br>
- gtl::transformation<int> tr(gtl::axis_transformation::SWAP_XY);<br>
- gtl::transform(pt, tr);<br>
- assert(gtl::equivalence(pt, Point(30, 10)));<br>
- <br>
- gtl::transformation<int> tr2 = tr.inverse();<br>
- assert(tr == tr2); //SWAP_XY is its own inverse transform<br>
- <br>
- gtl::transform(pt, tr2);<br>
- assert(gtl::equivalence(pt, pt2)); //the two points are equal again<br>
- <br>
- gtl::move(pt, o, 10); //move pt 10 units in y<br>
- assert(gtl::euclidean_distance(pt, pt2) == 10.0f);<br>
- <br>
- gtl::move(pt, o.get_perpendicular(), 10); //move pt 10 units in x<br>
- assert(gtl::manhattan_distance(pt, pt2) == 20);<br>
- <br>
- return 0;<br>
- }<br>
- </font></p>
- <table class="docinfo" rules="none" frame="void" id="table1">
- <colgroup>
- <col class="docinfo-name"><col class="docinfo-content">
- </colgroup>
- <tbody vAlign="top">
- <tr>
- <th class="docinfo-name">Copyright:</th>
- <td>Copyright © Intel Corporation 2008-2010.</td>
- </tr>
- <tr class="field">
- <th class="docinfo-name">License:</th>
- <td class="field-body">Distributed under the Boost Software License,
- Version 1.0. (See accompanying file <tt class="literal">
- <span class="pre">LICENSE_1_0.txt</span></tt> or copy at
- <a class="reference" target="_top" href="http://www.boost.org/LICENSE_1_0.txt">
- http://www.boost.org/LICENSE_1_0.txt</a>)</td>
- </tr>
- </table>
- </body>
- </html>
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