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backdiagonal2d.hh
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26 
27 #ifndef MLN_CANVAS_BROWSING_BACKDIAGONAL2D_HH
28 # define MLN_CANVAS_BROWSING_BACKDIAGONAL2D_HH
29 
33 
34 # include <mln/core/concept/browsing.hh>
35 # include <mln/core/concept/image.hh>
36 
37 
38 namespace mln
39 {
40 
41  namespace canvas
42  {
43 
44  namespace browsing
45  {
46 
86  struct backdiagonal2d_t : public Browsing< backdiagonal2d_t >
87  {
88  // This default constructor is needed for compilation with gcc
89  // 4.6.0, gcc 4.6.1 and Clang.
91 
92  template <typename F>
93  void operator()(F& f) const;
94  };
95 
96  extern const backdiagonal2d_t backdiagonal2d;
97 
98 
99 
100 # ifndef MLN_INCLUDE_ONLY
101 
102 # ifndef MLN_WO_GLOBAL_VARS
103 
105 
106 # endif // ! MLN_WO_GLOBAL_VARS
107 
108  inline
110  {
111  }
112 
113  template <typename F>
114  inline
115  void
116  backdiagonal2d_t::operator()(F& f) const
117  {
118  mln_trace("canvas::browsing::backdiagonal2d");
119 
120  typedef typename F::I I;
121  typedef mln_deduce(I, psite, delta) dpsite;
122  typedef mln_psite(I) psite;
123 
124  // Directions
125  dpsite dp_first(-1, 0);
126  dpsite dp_second(0, 1);
127  dpsite dp_diag(1, 1);
128 
129  mln_deduce(I, psite, delta) diag;
130 
131  psite
132  pmin = f.input.domain().pmin(),
133  pmax = f.input.domain().pmax();
134 
135  // Start at the bottom left corner.
136  f.p[0] = pmax[0];
137  f.p[1] = pmin[1];
138 
139  f.init();
140 
141  while (f.input.domain().has(f.p))
142  {
143  psite start_diag = f.p;
144  // Browse one diag.
145  f.init_diag();
146  while (f.input.domain().has(f.p))
147  {
148  f.next();
149  f.p = f.p + dp_diag;
150  }
151 
152  // Goto next diag start.
153  f.p = start_diag + dp_first;
154  }
155  f.p = f.p - dp_first;
156 
157  f.p = f.p + dp_second;
158  while (f.input.domain().has(f.p))
159  {
160  psite start_diag = f.p;
161 
162  // Browse one diag.
163  f.init_diag();
164  while (f.input.domain().has(f.p))
165  {
166  f.next();
167  f.p = f.p + dp_diag;
168  }
169  f.p = f.p - dp_diag;
170 
171  // Goto next diag start.
172  f.p = start_diag + dp_second;
173  }
174 
175  f.final();
176  }
177 
178 # endif // ! MLN_INCLUDE_ONLY
179 
180  } // end of namespace mln::canvas::browsing
181 
182  } // end of namespace mln::canvas
183 
184 } // end of namespace mln
185 
186 #endif // ! MLN_CANVAS_BROWSING_BACKDIAGONAL2D_HH