libs/geometry/doc/src/examples/algorithms/is_simple.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_simple
  12 //` Checks whether a geometry is simple
  13
  14 #include <iostream>
  15
  16 #include <boost/geometry.hpp>
  17 #include <boost/geometry/geometries/point_xy.hpp>
  18 #include <boost/geometry/geometries/linestring.hpp>
  19 #include <boost/geometry/geometries/multi_linestring.hpp>
  20 /*<-*/ #include "create_svg_one.hpp" /*->*/
  21
  22 int main()
  23 {
  24     typedef boost::geometry::model::d2::point_xy<double> point_type;
  25     typedef boost::geometry::model::linestring<point_type> linestring_type;
  26     typedef boost::geometry::model::multi_linestring<linestring_type> multi_linestring_type;
  27
  28     multi_linestring_type multi_linestring;
  29     boost::geometry::read_wkt("MULTILINESTRING((0 0,0 10,10 10,10 0,0 0),(10 10,20 20))", multi_linestring);
  30
  31     std::cout << "is simple? "
  32               << (boost::geometry::is_simple(multi_linestring) ? "yes" : "no")
  33               << std::endl;
  34     /*<-*/ create_svg("is_simple_example.svg", multi_linestring); /*->*/
  35     return 0;
  36 }
  37
  38 //]
  39
  40 //[is_simple_output
  41 /*`
  42 Output:
  43 [pre
  44 is simple? no
  45
  46 [$img/algorithms/is_simple_example.png]
  47
  48 ]
  49
  50 */
  51 //]