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line: add closest parameter to point query

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This commit is contained in:
Danny Robson 2015-02-19 14:20:09 +11:00
parent 0ed770eb09
commit 4057a131c8
2 changed files with 15 additions and 3 deletions
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17
line.cpp
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@ -34,15 +34,26 @@ util::line<S,T>::line (util::point<S,T> _p,
///----------------------------------------------------------------------------
/// returns the distance alone the line in a line-plane intersection
/// returns the distance along 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
util::line<S,T>::intersect (plane<S,T> q) const
{
return dot (rhs.p - p, rhs.n) / dot (d, rhs.n);
return dot (q.p - p, q.n) / dot (d, q.n);
}
///----------------------------------------------------------------------------
/// returns the closest parameter along the line to a given point
template <size_t S, typename T>
T
util::line<S,T>::closest (point<S,T> q) const
{
// project the origin-point difference onto the direction
return dot (p - q, d);
}

1
line.hpp
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@ -31,6 +31,7 @@ namespace util {
util::vector<S,T> direction);
T intersect (plane<S,T>) const;
T closest (point<S,T>) const;
util::point<S,T> at (T) const;