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Closest point algorithm can be easily extended to support 2d points #238

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Oct 5, 2014
Merged

Closest point algorithm can be easily extended to support 2d points #238

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ad85092
Update closest_point.hpp
SiliconKiwi Sep 15, 2014
b5409fb
Update closest_point.inl
SiliconKiwi Sep 15, 2014
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7 changes: 7 additions & 0 deletions glm/gtx/closest_point.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,13 @@ namespace glm
detail::tvec3<T, P> const & point,
detail::tvec3<T, P> const & a,
detail::tvec3<T, P> const & b);

/// 2d lines work as well
template <typename T, precision P>
GLM_FUNC_DECL detail::tvec2<T, P> closestPointOnLine(
detail::tvec2<T, P> const & point,
detail::tvec2<T, P> const & a,
detail::tvec2<T, P> const & b);

/// @}
}// namespace glm
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21 changes: 21 additions & 0 deletions glm/gtx/closest_point.inl
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Expand Up @@ -28,4 +28,25 @@ namespace glm
if(Distance >= LineLength) return b;
return a + LineDirection * Distance;
}

template <typename T, precision P>
GLM_FUNC_QUALIFIER detail::tvec2<T, P> closestPointOnLine
(
detail::tvec2<T, P> const & point,
detail::tvec2<T, P> const & a,
detail::tvec2<T, P> const & b
)
{
T LineLength = distance(a, b);
detail::tvec2<T, P> Vector = point - a;
detail::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