| 1 | /// @ref gtx_closest_point |
| 2 | |
| 3 | namespace 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 |