upload base code

1 files changed, 45 insertions, 0 deletions

diff --git a/glm/gtx/closest_point.inl b/glm/gtx/closest_point.inl
new file mode 100644
index 0000000..0a39b04
--- /dev/null
+++ b/glm/gtx/closest_point.inl
@@ -0,0 +1,45 @@
+/// @ref gtx_closest_point
+
+namespace glm
+{
+	template<typename T, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<3, T, Q> closestPointOnLine
+	(
+		vec<3, T, Q> const& point,
+		vec<3, T, Q> const& a,
+		vec<3, T, Q> const& b
+	)
+	{
+		T LineLength = distance(a, b);
+		vec<3, T, Q> Vector = point - a;
+		vec<3, T, Q> 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, qualifier Q>
+	GLM_FUNC_QUALIFIER vec<2, T, Q> closestPointOnLine
+	(
+		vec<2, T, Q> const& point,
+		vec<2, T, Q> const& a,
+		vec<2, T, Q> const& b
+	)
+	{
+		T LineLength = distance(a, b);
+		vec<2, T, Q> Vector = point - a;
+		vec<2, T, Q> 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