bool equivalent (const Line<D, NumericT> & other) {
// Are we pointing in the same direction
if (!_direction.equivalent(other._direction))
return false;
// Is the distance between the parallel lines equivalent to zero?
return Numerics::equivalent(shortest_distance_to_point(other._point), 0);
}
/// Is this segment zero-length?
bool is_degenerate () {
return _start.equivalent(_end);
}