ceph/src/boost/libs/geometry/doc/src/examples/algorithms/intersects_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 //[intersects
  11 //` Check if two linestrings intersect each other
  12
  13 #include <iostream>
  14
  15 #include <boost/geometry.hpp>
  16 #include <boost/geometry/geometries/linestring.hpp>
  17 #include <boost/geometry/geometries/point_xy.hpp>
  18
  19 int main()
  20 {
  21     // Calculate the intersects of a cartesian polygon
  22     typedef boost::geometry::model::d2::point_xy<double> P;
  23     bg::model::linestring<P> line1, line2;
  24
  25     boost::geometry::read_wkt("linestring(1 1,2 2)", line1);
  26     boost::geometry::read_wkt("linestring(2 1,1 2)", line2);
  27
  28     bool b = boost::geometry::intersects(line1, line2);
  29
  30     std::cout << "Intersects: " << (b ? "YES" : "NO") << std::endl;
  31
  32     return 0;
  33 }
  34
  35 //]
  36
  37
  38 //[intersects_output
  39 /*`
  40 Output:
  41 [pre
  42 Intersects: YES
  43 ]
  44 */
  45 //]