1 /////////////////////////////////////////////////////////////////////////////////////////////////// 2 // OpenGL Mathematics Copyright (c) 2005 - 2014 G-Truc Creation (www.g-truc.net) 3 /////////////////////////////////////////////////////////////////////////////////////////////////// 4 // Created : 2005-12-30 5 // Updated : 2008-10-05 6 // Licence : This source is under MIT License 7 // File : glm/gtx/closest_point.inl 8 /////////////////////////////////////////////////////////////////////////////////////////////////// 9 10 #ifndef glm_gtx_closest_point 11 #define glm_gtx_closest_point 12 13 namespace glm 14 { 15 template <typename T, precision P> 16 GLM_FUNC_QUALIFIER detail::tvec3<T, P> closestPointOnLine 17 ( 18 detail::tvec3<T, P> const & point, 19 detail::tvec3<T, P> const & a, 20 detail::tvec3<T, P> const & b 21 ) 22 { 23 T LineLength = distance(a, b); 24 detail::tvec3<T, P> Vector = point - a; 25 detail::tvec3<T, P> LineDirection = (b - a) / LineLength; 26 27 // Project Vector to LineDirection to get the distance of point from a 28 T Distance = dot(Vector, LineDirection); 29 30 if(Distance <= T(0)) return a; 31 if(Distance >= LineLength) return b; 32 return a + LineDirection * Distance; 33 } 34 }//namespace glm 35 36 #endif//glm_gtx_closest_point 37
