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<title>Boost.Geometry (aka GGL, Generic Geometry Library)</title>
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<h1>06_transformation_example.cpp</h1>This sample demonstrates the usage of transformations in the Generic Geometry Library. Behind the screens this is done using with the uBLAS matrix/vector library.<p>
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<div class="fragment"><pre class="fragment"><span class="comment">// Boost.Geometry (aka GGL, Generic Geometry Library)</span>
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<span class="comment">//</span>
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<span class="comment">// Copyright Barend Gehrels 2007-2009, Geodan, Amsterdam, the Netherlands</span>
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<span class="comment">// Copyright Bruno Lalande 2008, 2009</span>
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<span class="comment">// Use, modification and distribution is subject to the Boost Software License,</span>
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<span class="comment">// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at</span>
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<span class="comment">// http://www.boost.org/LICENSE_1_0.txt)</span>
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<span class="comment">//</span>
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<span class="comment">// Transformation Example</span>
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<span class="preprocessor">#include <iostream></span>
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<span class="preprocessor">#include <boost/geometry/geometry.hpp></span>
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<span class="preprocessor">#include <<a class="code" href="cartesian2d_8hpp.html">boost/geometry/geometries/cartesian2d.hpp</a>></span>
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<span class="preprocessor">#include <<a class="code" href="c__array__cartesian_8hpp.html">boost/geometry/geometries/adapted/c_array_cartesian.hpp</a>></span>
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<span class="preprocessor">#include <<a class="code" href="std__as__linestring_8hpp.html">boost/geometry/geometries/adapted/std_as_linestring.hpp</a>></span>
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<span class="keywordtype">int</span> main()
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{
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<span class="keyword">using namespace </span>boost::geometry;
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<a name="_a0"></a><a class="code" href="classboost_1_1geometry_1_1point__xy.html" title="2D point in Cartesian coordinate system">point_2d</a> p(1, 1);
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<a class="code" href="classboost_1_1geometry_1_1point__xy.html" title="2D point in Cartesian coordinate system">point_2d</a> p2;
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<span class="comment">// Example: translate a point over (5,5)</span>
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<a name="_a1"></a><a class="code" href="structboost_1_1geometry_1_1strategy_1_1transform_1_1translate__transformer.html" title="Strategy of translate transformation in Cartesian system.">strategy::transform::translate_transformer<point_2d, point_2d></a> translate(5, 5);
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<a name="a2"></a><a class="code" href="group__transform.html#g6b9a387b5ac973d7d9e273d9dffc1d3e" title="Transforms from one geometry to another geometry using a strategy.">transform</a>(p, p2, translate);
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std::cout << <span class="stringliteral">"transformed point "</span> << <a name="a3"></a><a class="code" href="group__utility.html#g62cc5db4d3bb1147591298b3500f8f1a" title="Main DSV-streaming function.">boost::geometry::dsv</a>(p2) << std::endl;
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<span class="comment">// Transform a polygon</span>
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<a name="_a4"></a><a class="code" href="classboost_1_1geometry_1_1polygon.html" title="The polygon contains an outer ring and zero or more inner rings.">polygon_2d</a> poly, poly2;
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<span class="keyword">const</span> <span class="keywordtype">double</span> coor[][2] = { {0, 0}, {0, 7}, {2, 2}, {2, 0}, {0, 0} };
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<span class="comment">// note that for this syntax you have to include the two</span>
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<span class="comment">// include files above (c_array_cartesian.hpp, std_as_linestring.hpp)</span>
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<a name="a5"></a><a class="code" href="group__access.html#gd1a7d6277b95439021f13191094aebdb" title="assign two values to a 2D point">assign</a>(poly, coor);
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<span class="comment">//read_wkt("POLYGON((0 0,0 7,4 2,2 0,0 0))", poly);</span>
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<a class="code" href="group__transform.html#g6b9a387b5ac973d7d9e273d9dffc1d3e" title="Transforms from one geometry to another geometry using a strategy.">transform</a>(poly, poly2, translate);
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std::cout << <span class="stringliteral">"source polygon "</span> << <a class="code" href="group__utility.html#g62cc5db4d3bb1147591298b3500f8f1a" title="Main DSV-streaming function.">boost::geometry::dsv</a>(poly) << std::endl;
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std::cout << <span class="stringliteral">"transformed polygon "</span> << <a class="code" href="group__utility.html#g62cc5db4d3bb1147591298b3500f8f1a" title="Main DSV-streaming function.">boost::geometry::dsv</a>(poly2) << std::endl;
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<span class="comment">// Many more transformations are possible:</span>
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<span class="comment">// - from Cartesian to Spherical coordinate systems and back</span>
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<span class="comment">// - from Cartesian to Cartesian (mapping, affine transformations) and back (inverse)</span>
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<span class="comment">// - Map Projections</span>
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<span class="comment">// - from Degree to Radian and back in spherical or geographic coordinate systems</span>
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<span class="keywordflow">return</span> 0;
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}
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</pre></div> </div>
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<td align="left"><small>
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<p>December 1, 2009</p>
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<small>Copyright © 1995-2009 Barend Gehrels, Geodan, Amsterdam<br>
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Copyright © 2008-2009 Bruno Lalande, Paris<br>
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Copyright © 2009 Mateusz Loskot, Cadcorp, London<br>
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