libcruft-util/line.cpp

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2015-02-19 13:28:56 +11:00
/*
* This file is part of libgim.
*
* libgim is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
#include "line.hpp"
#include "debug.hpp"
//-----------------------------------------------------------------------------
template <size_t S, typename T>
util::line<S,T>::line (util::point<S,T> _p,
util::vector<S,T> _d):
p (_p),
d (_d)
{
CHECK_EQ (d.magnitude2 (), 1);
}
///----------------------------------------------------------------------------
/// returns the distance alone the line in a line-plane intersection
///
/// returns inf if parallel
/// returns 0 if colinear
template <size_t S, typename T>
T
util::line<S,T>::intersect (plane<S,T> rhs) const
{
return dot (rhs.p - p, rhs.n) / dot (d, rhs.n);
}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
util::point<S,T>
util::line<S,T>::at (T t) const
{
return p + d * t;
}
//-----------------------------------------------------------------------------
template struct util::line<2,float>;
template struct util::line<3,float>;