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
main()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 //]
48
