46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
/// @ref gtx_closest_point
|
|
/// @file glm/gtx/closest_point.inl
|
|
|
|
namespace glm
|
|
{
|
|
template <typename T, precision P>
|
|
GLM_FUNC_QUALIFIER tvec3<T, P> closestPointOnLine
|
|
(
|
|
tvec3<T, P> const & point,
|
|
tvec3<T, P> const & a,
|
|
tvec3<T, P> const & b
|
|
)
|
|
{
|
|
T LineLength = distance(a, b);
|
|
tvec3<T, P> Vector = point - a;
|
|
tvec3<T, P> 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, precision P>
|
|
GLM_FUNC_QUALIFIER tvec2<T, P> closestPointOnLine
|
|
(
|
|
tvec2<T, P> const & point,
|
|
tvec2<T, P> const & a,
|
|
tvec2<T, P> const & b
|
|
)
|
|
{
|
|
T LineLength = distance(a, b);
|
|
tvec2<T, P> Vector = point - a;
|
|
tvec2<T, P> 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
|