1/// @ref gtx_closest_point
2
3namespace glm
4{
5	template<typename T, qualifier Q>
6	GLM_FUNC_QUALIFIER vec<3, T, Q> closestPointOnLine
7	(
8		vec<3, T, Q> const& point,
9		vec<3, T, Q> const& a,
10		vec<3, T, Q> const& b
11	)
12	{
13		T LineLength = distance(a, b);
14		vec<3, T, Q> Vector = point - a;
15		vec<3, T, Q> LineDirection = (b - a) / LineLength;
16
17		// Project Vector to LineDirection to get the distance of point from a
18		T Distance = dot(Vector, LineDirection);
19
20		if(Distance <= T(0)) return a;
21		if(Distance >= LineLength) return b;
22		return a + LineDirection * Distance;
23	}
24
25	template<typename T, qualifier Q>
26	GLM_FUNC_QUALIFIER vec<2, T, Q> closestPointOnLine
27	(
28		vec<2, T, Q> const& point,
29		vec<2, T, Q> const& a,
30		vec<2, T, Q> const& b
31	)
32	{
33		T LineLength = distance(a, b);
34		vec<2, T, Q> Vector = point - a;
35		vec<2, T, Q> LineDirection = (b - a) / LineLength;
36
37		// Project Vector to LineDirection to get the distance of point from a
38		T Distance = dot(Vector, LineDirection);
39
40		if(Distance <= T(0)) return a;
41		if(Distance >= LineLength) return b;
42		return a + LineDirection * Distance;
43	}
44
45}//namespace glm
46