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1 | // Boost.Geometry |
2 | ||
3 | // Copyright (c) 2019 Barend Gehrels, Amsterdam, the Netherlands. | |
4 | ||
5 | // Use, modification and distribution is subject to the Boost Software License, | |
6 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
7 | // http://www.boost.org/LICENSE_1_0.txt) | |
8 | ||
9 | #ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_MAKE_MAKE_HPP | |
10 | #define BOOST_GEOMETRY_ALGORITHMS_DETAIL_MAKE_MAKE_HPP | |
11 | ||
12 | #include <boost/geometry/geometries/infinite_line.hpp> | |
13 | #include <boost/geometry/core/access.hpp> | |
14 | ||
15 | namespace boost { namespace geometry | |
16 | { | |
17 | ||
18 | #ifndef DOXYGEN_NO_DETAIL | |
19 | namespace detail { namespace make | |
20 | { | |
21 | ||
22 | template <typename Type, typename Coordinate> | |
23 | inline | |
24 | model::infinite_line<Type> make_infinite_line(Coordinate const& x1, | |
25 | Coordinate const& y1, Coordinate const& x2, Coordinate const& y2) | |
26 | { | |
27 | model::infinite_line<Type> result; | |
28 | result.a = y1 - y2; | |
29 | result.b = x2 - x1; | |
30 | result.c = -result.a * x1 - result.b * y1; | |
31 | return result; | |
32 | } | |
33 | ||
34 | template <typename Type, typename Point> | |
35 | inline | |
36 | model::infinite_line<Type> make_infinite_line(Point const& a, Point const& b) | |
37 | { | |
38 | return make_infinite_line<Type>(geometry::get<0>(a), geometry::get<1>(a), | |
39 | geometry::get<0>(b), geometry::get<1>(b)); | |
40 | } | |
41 | ||
42 | template <typename Type, typename Segment> | |
43 | inline | |
44 | model::infinite_line<Type> make_infinite_line(Segment const& segment) | |
45 | { | |
46 | return make_infinite_line<Type>(geometry::get<0, 0>(segment), | |
47 | geometry::get<0, 1>(segment), | |
48 | geometry::get<1, 0>(segment), | |
49 | geometry::get<1, 1>(segment)); | |
50 | } | |
51 | ||
20effc67 TL |
52 | template <typename Type, typename Point> |
53 | inline | |
54 | model::infinite_line<Type> make_perpendicular_line(Point const& a, Point const& b, Point const& c) | |
55 | { | |
56 | // https://www.math-only-math.com/equation-of-a-line-perpendicular-to-a-line.html | |
57 | model::infinite_line<Type> const line = make_infinite_line<Type>(a, b); | |
58 | model::infinite_line<Type> result; | |
59 | result.a = line.b; | |
60 | result.b = -line.a; | |
61 | // Lines with any result.c are perpendicular to a->b | |
62 | // Calculate this result such that it goes through point c | |
63 | result.c = -result.a * geometry::get<0>(c) - result.b * geometry::get<1>(c); | |
64 | return result; | |
65 | } | |
92f5a8d4 TL |
66 | |
67 | }} // namespace detail::make | |
68 | #endif // DOXYGEN_NO_DETAIL | |
69 | ||
70 | ||
71 | }} // namespace boost::geometry | |
72 | ||
73 | #endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_MAKE_MAKE_HPP |