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projection.hh
1 // Copyright (C) 2009 EPITA Research and Development Laboratory (LRDE)
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25 
26 #ifndef MLN_FUN_V2V_PROJECTION_HH
27 # define MLN_FUN_V2V_PROJECTION_HH
28 
32 
33 # include <mln/core/concept/function.hh>
34 # include <mln/core/point.hh>
35 # include <mln/core/grids.hh>
36 
37 
38 namespace mln
39 {
40 
41  namespace fun
42  {
43 
44  namespace v2v
45  {
46 
47  template <typename P, unsigned dir>
48  struct projection : public Function_v2v< projection<P,dir> >
49  {
50  private:
51  typedef mln_grid(P) G_;
52  typedef mln_coord(P) C_;
53  enum { n_ = G_::dim };
54 
55  public:
56 
57  typedef point<mln_regular_grid_from_dim(n_ - 1), C_> result;
58  typedef P argument;
59 
60  result operator()(const P& p) const;
61  };
62 
63 
64 # ifndef MLN_INCLUDE_ONLY
65 
66  template <typename P, unsigned dir>
67  inline
69  projection<P, dir>::operator()(const P& p) const
70  {
71  result tmp;
72  for (unsigned i = 0, j = 0; i < n_; ++i)
73  if (i == dir)
74  continue;
75  else
76  tmp[j++] = p[i];
77  return tmp;
78  }
79 
80 # endif // ! MLN_INCLUDE_ONLY
81 
82  } // end of namespace mln::fun::v2v
83 
84  } // end of namespace mln::fun
85 
86 } // end of namespace mln
87 
88 
89 #endif // ! MLN_FUN_V2V_PROJECTION_HH