64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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 util::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 (util::point<S,T> a, util::point<S,T> b):
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line (a, normalised (b - a))
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{ ; }
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line (util::point<S,T> _base, util::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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util::point<S,T> base;
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util::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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