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snake_fwd.hh
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26 
27 #ifndef MLN_CANVAS_BROWSING_SNAKE_FWD_HH
28 # define MLN_CANVAS_BROWSING_SNAKE_FWD_HH
29 
33 
34 # include <mln/core/concept/browsing.hh>
35 # include <mln/geom/size2d.hh>
36 
37 
38 namespace mln
39 {
40 
41  namespace canvas
42  {
43 
44  namespace browsing
45  {
46 
86  struct snake_fwd_t : public Browsing< snake_fwd_t >
87  {
88  // This default constructor is needed for compilation with gcc
89  // 4.6.0, gcc 4.6.1 and Clang.
90  snake_fwd_t();
91 
92  template <typename F>
93  void operator()(F& f) const;
94  };
95 
96  extern const snake_fwd_t snake_fwd;
97 
98 # ifndef MLN_INCLUDE_ONLY
99 
100 # ifndef MLN_WO_GLOBAL_VARS
101 
102  const snake_fwd_t snake_fwd;
103 
104 # endif // ! MLN_WO_GLOBAL_VARS
105 
106  inline
108  {
109  }
110 
111  template <typename F>
112  inline
113  void
114  snake_fwd_t::operator()(F& f) const
115  {
116  // FIXME: Check the dimension of the input
117 // mlc_equal(mln_trait_image_dimension(I)(),
118 // trait::image::dimension::two_d)::check();
119  mln_trace("canvas::browsing::snake_fwd");
120  mln_precondition(f.input.is_valid());
121  def::coord
122  min_row = geom::min_row(f.input), max_row = geom::max_row(f.input),
123  min_col = geom::min_col(f.input), max_col = geom::max_col(f.input);
124 
125  // p
126  f.p = f.input.bbox().pmin();
127  def::coord& row = f.p.row();
128  def::coord& col = f.p.col();
129 
130  // initialization
131  f.init();
132 
133  bool fwd = true;
134  for (row = min_row; row <= max_row; ++row)
135  // FIXME: Add "if (f.input.has(p))"?
136  {
137  // go down
138  f.down();
139 
140  if (fwd)
141  // browse line fwd
142  while (col < max_col)
143  {
144  ++col;
145  f.fwd();
146  }
147  else
148  // browse line bkd
149  while (col > min_col)
150  {
151  --col;
152  f.bkd();
153  }
154 
155  // change browsing
156  fwd = ! fwd;
157  }
158  }
159 
160 # endif // ! MLN_INCLUDE_ONLY
161 
162  } // end of namespace mln::canvas::browsing
163 
164  } // end of namespace mln::canvas
165 
166 } // end of namespace mln
167 
168 
169 #endif // ! MLN_CANVAS_BROWSING_SNAKE_FWD_HH