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lib/glm/gtx/closest_point.inl

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+/// @ref gtx_closest_point
+/// @file glm/gtx/closest_point.inl
+
+namespace glm
+{
+	template <typename T, precision P>
+	GLM_FUNC_QUALIFIER tvec3<T, P> closestPointOnLine
+	(
+		tvec3<T, P> const & point,
+		tvec3<T, P> const & a,
+		tvec3<T, P> const & b
+	)
+	{
+		T LineLength = distance(a, b);
+		tvec3<T, P> Vector = point - a;
+		tvec3<T, P> LineDirection = (b - a) / LineLength;
+
+		// Project Vector to LineDirection to get the distance of point from a
+		T Distance = dot(Vector, LineDirection);
+
+		if(Distance <= T(0)) return a;
+		if(Distance >= LineLength) return b;
+		return a + LineDirection * Distance;
+	}
+	
+	template <typename T, precision P>
+	GLM_FUNC_QUALIFIER tvec2<T, P> closestPointOnLine
+	(
+		tvec2<T, P> const & point,
+		tvec2<T, P> const & a,
+		tvec2<T, P> const & b
+	)
+	{
+		T LineLength = distance(a, b);
+		tvec2<T, P> Vector = point - a;
+		tvec2<T, P> LineDirection = (b - a) / LineLength;
+
+		// Project Vector to LineDirection to get the distance of point from a
+		T Distance = dot(Vector, LineDirection);
+
+		if(Distance <= T(0)) return a;
+		if(Distance >= LineLength) return b;
+		return a + LineDirection * Distance;
+	}
+	
+}//namespace glm