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

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2 // QuickBook Example
   3
   4 // Copyright (c) 2014, Oracle and/or its affiliates
   5
   6 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
   7
   8 // Licensed under the Boost Software License version 1.0.
   9 // http://www.boost.org/users/license.html
  10
  11 //[is_valid
  12 //` Checks whether a geometry is valid
  13
  14 #include <iostream>
  15
  16 #include <boost/geometry.hpp>
  17 #include <boost/geometry/geometries/point_xy.hpp>
  18 #include <boost/geometry/geometries/polygon.hpp>
  19 /*<-*/ #include "create_svg_one.hpp" /*->*/
  20
  21 int main()
  22 {
  23     typedef boost::geometry::model::d2::point_xy<double> point_type;
  24     typedef boost::geometry::model::polygon<point_type> polygon_type;
  25
  26     polygon_type poly;
  27     boost::geometry::read_wkt("POLYGON((0 0,0 10,10 10,10 0,0 0),(0 0,9 1,9 2,0 0),(0 0,2 9,1 9,0 0),(2 9,9 2,9 9,2 9))", poly);
  28
  29     std::cout << "is valid? " << (boost::geometry::is_valid(poly) ? "yes" : "no") << std::endl;
  30     /*<-*/ create_svg("is_valid_example.svg", poly); /*->*/
  31     return 0;
  32 }
  33
  34 //]
  35
  36 //[is_valid_output
  37 /*`
  38 Output:
  39 [pre
  40 is valid? no
  41
  42 [$img/algorithms/is_valid_example.png]
  43
  44 ]
  45
  46 */
  47 //]