///////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
///
/// Copyright (c) 2005 - 2015 G-Truc Creation (www.g-truc.net)
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
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/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
/// 
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
/// 
/// Restrictions:
///             By making use of the Software for military purposes, you choose to make
///             a Bunny unhappy.
/// 
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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///
/// @ref gtx_closest_point
/// @file glm/gtx/closest_point.inl
/// @date 2005-12-30 / 2011-06-07
/// @author Christophe Riccio
///////////////////////////////////////////////////////////////////////////////////////////////////

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