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