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1 | // Boost.Geometry (aka GGL, Generic Geometry Library) |
2 | // QuickBook Example | |
3 | ||
4 | // Copyright (c) 2013, 2014 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 | //[buffer_with_strategies | |
11 | //` Shows how the buffer algorithm can be used to create a buffer of a linestring, a multi point, a multi polygon | |
12 | ||
13 | #include <boost/geometry.hpp> | |
14 | #include <boost/geometry/geometries/point_xy.hpp> | |
15 | #include <boost/geometry/geometries/geometries.hpp> | |
16 | /*<-*/ #include "../examples_utils/create_svg_buffer.hpp" /*->*/ | |
17 | ||
18 | int main() | |
19 | { | |
20 | typedef double coordinate_type; | |
21 | typedef boost::geometry::model::d2::point_xy<coordinate_type> point; | |
22 | typedef boost::geometry::model::polygon<point> polygon; | |
23 | ||
24 | // Declare strategies | |
25 | const double buffer_distance = 1.0; | |
26 | const int points_per_circle = 36; | |
27 | boost::geometry::strategy::buffer::distance_symmetric<coordinate_type> distance_strategy(buffer_distance); | |
28 | boost::geometry::strategy::buffer::join_round join_strategy(points_per_circle); | |
29 | boost::geometry::strategy::buffer::end_round end_strategy(points_per_circle); | |
30 | boost::geometry::strategy::buffer::point_circle circle_strategy(points_per_circle); | |
31 | boost::geometry::strategy::buffer::side_straight side_strategy; | |
32 | ||
33 | // Declare output | |
34 | boost::geometry::model::multi_polygon<polygon> result; | |
35 | ||
36 | // Declare/fill a linestring | |
37 | boost::geometry::model::linestring<point> ls; | |
38 | boost::geometry::read_wkt("LINESTRING(0 0,4 5,7 4,10 6)", ls); | |
39 | ||
40 | // Create the buffer of a linestring | |
41 | boost::geometry::buffer(ls, result, | |
42 | distance_strategy, side_strategy, | |
43 | join_strategy, end_strategy, circle_strategy); | |
44 | /*<-*/ create_svg_buffer("buffer_linestring.svg", ls, result); /*->*/ | |
45 | ||
46 | // Declare/fill a multi point | |
47 | boost::geometry::model::multi_point<point> mp; | |
48 | boost::geometry::read_wkt("MULTIPOINT((3 3),(4 4),(6 2))", mp); | |
49 | ||
50 | // Create the buffer of a multi point | |
51 | boost::geometry::buffer(mp, result, | |
52 | distance_strategy, side_strategy, | |
53 | join_strategy, end_strategy, circle_strategy); | |
54 | /*<-*/ create_svg_buffer("buffer_multi_point.svg", mp, result); /*->*/ | |
55 | ||
56 | // Declare/fill a multi_polygon | |
57 | boost::geometry::model::multi_polygon<polygon> mpol; | |
58 | boost::geometry::read_wkt("MULTIPOLYGON(((0 1,2 5,5 3,0 1)),((1 1,5 2,5 0,1 1)))", mpol); | |
59 | ||
60 | // Create the buffer of a multi polygon | |
61 | boost::geometry::buffer(mpol, result, | |
62 | distance_strategy, side_strategy, | |
63 | join_strategy, end_strategy, circle_strategy); | |
64 | /*<-*/ create_svg_buffer("buffer_multi_polygon.svg", mpol, result); /*->*/ | |
65 | ||
66 | return 0; | |
67 | } | |
68 | ||
69 | //] | |
70 |