51 lines
1.1 KiB
C++
51 lines
1.1 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#pragma once
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#include "../point.hpp"
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namespace util::geom {
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template <size_t S, typename T>
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struct segment {
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util::point<S,T> a;
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util::point<S,T> b;
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};
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using segment2f = segment<2,float>;
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using segment3f = segment<3,float>;
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template <size_t S, typename T>
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T
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distance2 (segment<S,T> s, point<S,T> p)
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{
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const auto dir = s.b - s.a;
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const auto t1 = dot (p - s.a, dir);
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if (t1 < 0)
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return distance2 (p, s.a);
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const auto t2 = dot (dir, dir);
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if (t2 < t1)
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return distance2 (p, s.b);
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auto t = t1 / t2;
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return distance2 (p, s.a + t * dir);
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}
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template <size_t S, typename T>
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T
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distance (segment<S,T> s, point<S,T> p)
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{
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return std::sqrt (distance2 (s, p));
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}
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};
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