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| <title>Polygon Usage</title> |
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| <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> |
| //lets construct a 10x10 rectangle shaped polygon<br> |
| typedef gtl::polygon_data<int> Polygon;<br> |
| typedef gtl::polygon_traits<Polygon>::point_type Point;<br> |
| Point pts[] = {gtl::construct<Point>(0, 0),<br> |
| gtl::construct<Point>(10, 0),<br> |
| gtl::construct<Point>(10, 10),<br> |
| gtl::construct<Point>(0, 10) };<br> |
| Polygon poly;<br> |
| gtl::set_points(poly, pts, pts+4);<br> |
| <br> |
| //now lets see what we can do with this polygon<br> |
| assert(gtl::area(poly) == 100.0f);<br> |
| assert(gtl::contains(poly, gtl::construct<Point>(5, 5)));<br> |
| assert(!gtl::contains(poly, gtl::construct<Point>(15, 5)));<br> |
| gtl::rectangle_data<int> rect;<br> |
| assert(gtl::extents(rect, poly)); //get bounding box of poly<br> |
| assert(gtl::equivalence(rect, poly)); //hey, that's slick<br> |
| assert(gtl::winding(poly) == gtl::COUNTERCLOCKWISE);<br> |
| assert(gtl::perimeter(poly) == 40.0f);<br> |
| <br> |
| //add 5 to all coords of poly<br> |
| gtl::convolve(poly, gtl::construct<Point>(5, 5));<br> |
| //multiply all coords of poly by 2<br> |
| gtl::scale_up(poly, 2);<br> |
| gtl::set_points(rect, gtl::point_data<int>(10, 10),<br> |
| gtl::point_data<int>(30, 30));<br> |
| assert(gtl::equivalence(poly, rect));<br> |
| return 0;<br> |
| }<br> |
| //Now you know how to use the built in polygon data type<br> |
| </font></p> |
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| <col class="docinfo-name"><col class="docinfo-content"> |
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| <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> |
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