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42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
///////////////////////////////////////////////////////////////////////////////////////////////////
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// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Created : 2005-12-30
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// Updated : 2008-10-05
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// Licence : This source is under MIT License
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// File : glm/gtx/closest_point.inl
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///////////////////////////////////////////////////////////////////////////////////////////////////
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#ifndef glm_gtx_closest_point
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#define glm_gtx_closest_point
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namespace glm{
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namespace gtx{
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namespace closest_point{
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template <typename valType>
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GLM_FUNC_QUALIFIER detail::tvec3<valType> closestPointOnLine
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(
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detail::tvec3<valType> const & point,
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detail::tvec3<valType> const & a,
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detail::tvec3<valType> const & b
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)
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{
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valType LineLength = distance(a, b);
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detail::tvec3<valType> Vector = point - a;
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detail::tvec3<valType> LineDirection = (b - a) / LineLength;
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// Project Vector to LineDirection to get the distance of point from a
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valType Distance = dot(Vector, LineDirection);
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if(Distance <= valType(0)) return a;
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if(Distance >= LineLength) return b;
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return a + LineDirection * Distance;
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}
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}//namespace closest_point
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}//namespace gtx
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}//namespace glm
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#endif//glm_gtx_closest_point
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