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big_chess.hh
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25 
26 #ifndef MLN_FUN_P2B_BIG_CHESS_HH
27 # define MLN_FUN_P2B_BIG_CHESS_HH
28 
34 # include <mln/core/concept/function.hh>
35 # include <mln/core/alias/point2d.hh>
36 
37 
38 namespace mln
39 {
40 
41  namespace fun
42  {
43 
44  namespace p2b
45  {
46 
47  // FIXME: Doc!
48  template <typename B>
49  struct big_chess : public Function_v2b< big_chess<B> >
50  {
51  typedef bool result;
52  typedef mln_psite(B) P;
53 
54  big_chess(const B& box, const unsigned div);
55 
56  bool operator()(const P& p) const;
57 
58  const B& box;
59  const unsigned div;
60  };
61 
62 
63 # ifndef MLN_INCLUDE_ONLY
64 
65  template < typename B>
66  big_chess<B>::big_chess(const B& box, const unsigned div)
67  : box(box), div(div)
68  {
69  }
70 
71  template < typename B>
72  inline
73  bool
74  big_chess<B>::operator()(const P& p) const
75  {
76  mln_coord(P) ret = 0;
77 
78  for (short i = 0; i < P::dim; i++)
79  ret += p[i] / ((box.pmax()[i] - 1) / div);
80 
81  return ret % 2;
82  }
83 
84 # endif // ! MLN_INCLUDE_ONLY
85 
86  } // end of namespace mln::fun::p2b
87 
88  } // end of namespace mln::fun
89 
90 } // end of namespace mln
91 
92 
93 #endif // ! MLN_FUN_P2B_BIG_CHESS_HH