1 // Boost.Geometry (aka GGL, Generic Geometry Library)
2 // QuickBook Example
3
4 // Copyright (c) 2020 Digvijay Janartha, Hamirpur, India.
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 //[covered_by
11 //` Checks if the first geometry is inside or on border the second geometry
12
13 #include <iostream>
14
15 #include <boost/geometry.hpp>
16 #include <boost/geometry/geometries/point_xy.hpp>
17 #include <boost/geometry/geometries/polygon.hpp>
18
19 namespace bg = boost::geometry; /*< Convenient namespace alias >*/
20
main()21 int main()
22 {
23 // Checks if the first geometry is inside or on border the second geometry.
24 bg::model::polygon<bg::model::d2::point_xy<double> > poly1;
25 bg::read_wkt("POLYGON((0 2,0 3,2 4,1 2,0 2))", poly1);
26 bg::model::polygon<bg::model::d2::point_xy<double> > poly2;
27 bg::read_wkt("POLYGON((0 4,3 4,2 2,0 1,0 4))", poly2);
28 bool check_covered = bg::covered_by(poly1, poly2);
29 if (check_covered) {
30 std::cout << "Covered: Yes" << std::endl;
31 } else {
32 std::cout << "Covered: No" << std::endl;
33 }
34
35 bg::model::polygon<bg::model::d2::point_xy<double> > poly3;
36 bg::read_wkt("POLYGON((-1 -1,-3 -4,-7 -7,-4 -3,-1 -1))", poly3);
37 check_covered = bg::covered_by(poly1, poly3);
38 if (check_covered) {
39 std::cout << "Covered: Yes" << std::endl;
40 } else {
41 std::cout << "Covered: No" << std::endl;
42 }
43
44 // This should return true since both polygons are same, so they are lying on each other.
45 check_covered = bg::covered_by(poly1, poly1);
46 if (check_covered) {
47 std::cout << "Covered: Yes" << std::endl;
48 } else {
49 std::cout << "Covered: No" << std::endl;
50 }
51
52 return 0;
53 }
54
55 //]
56
57
58 //[covered_by_output
59 /*`
60 Output:
61 [pre
62 Covered: Yes
63
64 [$img/algorithms/covered_by.png]
65
66 Covered: No
67 Covered: Yes
68 ]
69 */
70 //]
71
