ceph/src/boost/libs/geometry/doc/src/examples/algorithms/intersection_segment.cpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2 // QuickBook Example
   3
   4 // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands.
   5
   6 // Use, modification and distribution is subject to the Boost Software License,
   7 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   8 // http://www.boost.org/LICENSE_1_0.txt)
   9
  10 //[intersection_segment
  11 //` Calculate the intersection point (or points) of two segments
  12
  13 #include <iostream>
  14
  15 #include <boost/geometry.hpp>
  16 #include <boost/geometry/geometries/point_xy.hpp>
  17
  18 #include <boost/foreach.hpp>
  19
  20
  21 int main()
  22 {
  23     typedef boost::geometry::model::d2::point_xy<double> P;
  24     boost::geometry::model::segment<P> segment1, segment2;
  25     boost::geometry::read_wkt("linestring(1 1,2 2)", segment1);
  26     boost::geometry::read_wkt("linestring(2 1,1 2)", segment2);
  27
  28     std::vector<P> intersections;
  29     boost::geometry::intersection(segment1, segment2, intersections);
  30
  31     BOOST_FOREACH(P const& p, intersections)
  32     {
  33         std::cout << " " << boost::geometry::wkt(p);
  34     }
  35     std::cout << std::endl;
  36
  37     return 0;
  38 }
  39
  40 //]
  41
  42
  43 //[intersection_segment_output
  44 /*`
  45 Output:
  46 [pre
  47  POINT(1.5 1.5)
  48 ]
  49 */
  50 //]