diff options
Diffstat (limited to 'src/include/glm/gtx/closest_point.inl')
| -rw-r--r-- | src/include/glm/gtx/closest_point.inl | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/include/glm/gtx/closest_point.inl b/src/include/glm/gtx/closest_point.inl new file mode 100644 index 0000000..4c17506 --- /dev/null +++ b/src/include/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
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