56 lines
1.3 KiB
C++
56 lines
1.3 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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#include "../vector.hpp"
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namespace cruft::geom {
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// an line of infinite extent that passes though 'base'.
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//
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// direction should be normalised
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template <size_t S, typename T>
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struct line {
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line () = default;
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line (cruft::point<S,T> a, cruft::point<S,T> b):
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line (a, normalised (b - a))
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{ ; }
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line (cruft::point<S,T> _base, cruft::vector<S,T> _direction):
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base (_base),
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direction (_direction)
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{
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CHECK (is_normalised (direction));
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}
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cruft::point<S,T> base;
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cruft::vector<S,T> direction;
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};
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using line2f = line<2,float>;
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using line3f = line<3,float>;
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template <size_t S, typename T>
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T
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distance2 (line<S,T> l, point<S,T> p)
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{
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const auto t = dot (p - l.base, l.direction);
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return distance2 (p, l.base + l.direction * t);
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}
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template <size_t S, typename T>
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T
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distance (line<S,T> l, point<S,T> p)
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{
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return std::sqrt (distance2 (l, p));
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}
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};
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