/usr/include/glm/gtx/closest_point.inl is in libglm-dev 0.9.9~a2-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | /// @ref gtx_closest_point
/// @file glm/gtx/closest_point.inl
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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