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 //[distance
11 //` Shows calculation of distance of point to some other geometries
12
13 #include <iostream>
14 #include <list>
15
16 #include <boost/geometry.hpp>
17 #include <boost/geometry/geometries/linestring.hpp>
18 #include <boost/geometry/geometries/point_xy.hpp>
19 #include <boost/geometry/geometries/polygon.hpp>
20 #include <boost/geometry/geometries/multi_point.hpp>
21 #include <boost/geometry/geometries/multi_polygon.hpp>
22
23 #include <boost/foreach.hpp>
24
main()25 int main()
26 {
27 typedef boost::geometry::model::d2::point_xy<double> point_type;
28 typedef boost::geometry::model::polygon<point_type> polygon_type;
29 typedef boost::geometry::model::linestring<point_type> linestring_type;
30 typedef boost::geometry::model::multi_point<point_type> multi_point_type;
31
32 point_type p(1,2);
33 polygon_type poly;
34 linestring_type line;
35 multi_point_type mp;
36
37 boost::geometry::read_wkt(
38 "POLYGON((2 1.3,2.4 1.7,2.8 1.8,3.4 1.2,3.7 1.6,3.4 2,4.1 3,5.3 2.6,5.4 1.2,4.9 0.8,2.9 0.7,2 1.3)"
39 "(4.0 2.0, 4.2 1.4, 4.8 1.9, 4.4 2.2, 4.0 2.0))", poly);
40 line.push_back(point_type(0,0));
41 line.push_back(point_type(0,3));
42 mp.push_back(point_type(0,0));
43 mp.push_back(point_type(3,3));
44
45 std::cout
46 << "Point-Poly: " << boost::geometry::distance(p, poly) << std::endl
47 << "Point-Line: " << boost::geometry::distance(p, line) << std::endl
48 << "Point-MultiPoint: " << boost::geometry::distance(p, mp) << std::endl;
49
50 return 0;
51 }
52
53 //]
54
55
56 //[distance_output
57 /*`
58 Output:
59 [pre
60 Point-Poly: 1.22066
61 Point-Line: 1
62 Point-MultiPoint: 2.23607
63 ]
64 */
65 //]
66
67