[Olena-patches] milena r1428: Add box_bounds_piter_ to iterate on the bounds of a box2d

URL: https://svn.lrde.epita.fr/svn/oln/trunk/milena ChangeLog: 2007-11-05 Matthieu Garrigues &lt;garrigues(a)lrde.epita.fr&gt; Add box_bounds_piter_ to iterate on the bounds of a box2d. * mln/core/box_piter.hh: (box_bounds_piter_) New, iterator to iterate on the bounds of a box2d. --- box_piter.hh | 129 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 129 insertions(+) Index: trunk/milena/mln/core/box_piter.hh =================================================================== --- trunk/milena/mln/core/box_piter.hh (revision 1427) +++ trunk/milena/mln/core/box_piter.hh (revision 1428) @@ -139,6 +139,59 @@ }; + /*! \brief A iterator on points of bounds of a boxes 2d. + * + * The parameter \c P is the type of points. + * + * \see mln::box_ + * + * \todo change it to n dimensions + */ + + template <typename P> + class box_bounds_piter_ : public internal::point_iterator_base_< P, box_bounds_piter_<P> > + { + typedef box_bounds_piter_<P> self_; + typedef internal::point_iterator_base_< P, self_ > super_; + public: + + // Make definitions from super class available. + enum { dim = super_::dim }; + + /*! \brief Constructor. + * + * \param[in] b A box. + */ + box_bounds_piter_(const box_<P>& b); + + /// Convertion to point. + operator P() const; + + /// Reference to the corresponding point. + const P& to_point() const; + + /// Give the i-th coordinate. + mln_coord(P) operator[](unsigned i) const; + + /// Test the iterator validity. + bool is_valid() const; + + /// Invalidate the iterator. + void invalidate(); + + /// Start an iteration. + void start(); + + /// Go to the next point. + void next_(); + + private: + const box_<P>& b_; + P p_, nop_; + unsigned step_; + }; + + # ifndef MLN_INCLUDE_ONLY @@ -284,6 +337,82 @@ p_ = nop_; } + + // box_bounds_piter_<P> + + template <typename P> + box_bounds_piter_<P>::box_bounds_piter_(const box_<P>& b) + : b_(b) + { + nop_ = b_.pmax(); + ++nop_[0]; + invalidate(); + } + + template <typename P> + box_bounds_piter_<P>::operator P() const + { + return p_; + } + + template <typename P> + const P& + box_bounds_piter_<P>::to_point() const + { + return p_; + } + + template <typename P> + mln_coord(P) + box_bounds_piter_<P>::operator[](unsigned i) const + { + assert(i < dim); + return p_[i]; + } + + template <typename P> + bool + box_bounds_piter_<P>::is_valid() const + { + return p_ != nop_; + } + + template <typename P> + void + box_bounds_piter_<P>::invalidate() + { + p_ = nop_; + } + + template <typename P> + void + box_bounds_piter_<P>::start() + { + p_ = b_.pmin(); + step_ = 1; + } + + template <typename P> + void + box_bounds_piter_<P>::next_() + { + if (step_ <= 2) + p_[step_ - 1]++; + if (step_ > 2) + p_[step_ - 3]--; + + if (step_ > 2) + if (p_[step_ - 3] == b_.pmin()[step_ - 3]) + step_++; + + if (step_ <= 2) + if (p_[step_ - 1] == b_.pmax()[step_ - 1]) + step_++; + + if (step_ == 5) + invalidate(); + } + # endif // ! MLN_INCLUDE_ONLY } // end of namespace mln