/Src/Dependencies/Boost/libs/geometry/doc/src/examples/algorithms/difference_inserter.cpp
http://hadesmem.googlecode.com/ · C++ · 88 lines · 36 code · 18 blank · 34 comment · 0 complexity · 281b06e4933cc10fe05b780cfe6b82af MD5 · raw file
- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // QuickBook Example
- // Copyright (c) 2011 Barend Gehrels, Amsterdam, the Netherlands.
- // Use, modification and distribution is subject to the Boost Software License,
- // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- //[difference_inserter
- //` Shows how the difference_inserter function can be used
- #include <iostream>
- #include <vector>
- #include <boost/geometry.hpp>
- #include <boost/geometry/geometries/point_xy.hpp>
- #include <boost/geometry/geometries/polygon.hpp>
- #include <boost/geometry/domains/gis/io/wkt/wkt.hpp>
- #include <boost/foreach.hpp>
- /*<-*/ #include "create_svg_overlay.hpp" /*->*/
- int main()
- {
- typedef boost::geometry::model::polygon<boost::geometry::model::d2::point_xy<double> > polygon;
- polygon green, blue;
- boost::geometry::read_wkt(
- "POLYGON((2 1.3,2.4 1.7,2.8 1.8,3.4 1.2,3.7 1.6,3.4 2,4.1 3,5.3 2.6,5.4 1.2,4.9 0.8,2.9 0.7,2 1.3)"
- "(4.0 2.0, 4.2 1.4, 4.8 1.9, 4.4 2.2, 4.0 2.0))", green);
- boost::geometry::read_wkt(
- "POLYGON((4.0 -0.5 , 3.5 1.0 , 2.0 1.5 , 3.5 2.0 , 4.0 3.5 , 4.5 2.0 , 6.0 1.5 , 4.5 1.0 , 4.0 -0.5))", blue);
- std::vector<polygon> output;
- // Note that this sample simulates the symmetric difference,
- // which is also available as a separate algorithm.
- // It chains the output iterator returned by the function to the second instance.
- boost::geometry::difference_inserter<polygon>
- (
- green, blue,
- boost::geometry::difference_inserter<polygon>
- (
- blue, green,
- std::back_inserter(output)
- )
- );
- int i = 0;
- std::cout << "(blue \ green) u (green \ blue):" << std::endl;
- BOOST_FOREACH(polygon const& p, output)
- {
- std::cout << i++ << ": " << boost::geometry::area(p) << std::endl;
- }
- /*<-*/ create_svg("difference_inserter.svg", green, blue, output); /*->*/
- return 0;
- }
- //]
- //[difference_inserter_output
- /*`
- Output:
- [pre
- (blue \\ green) u (green \\ blue):
- 0: 0.525154
- 1: 0.015
- 2: 0.181136
- 3: 0.128798
- 4: 0.340083
- 5: 0.307778
- 6: 0.02375
- 7: 0.542951
- 8: 0.0149697
- 9: 0.226855
- 10: 0.839424
- [$img/algorithms/sym_difference.png]
- ]
- */
- //]