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Olena  User documentation 2.1
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connectivity_numbers_2d.cc
1 // Copyright (C) 2011 EPITA Research and Development Laboratory (LRDE)
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25 
29 
30 #include <mln/core/image/image2d.hh>
31 #include <mln/core/alias/neighb2d.hh>
32 #include <mln/make/box2d.hh>
33 
34 #include <mln/topo/connectivity_number_2d.hh>
35 
36 #include <mln/data/fill.hh>
37 
38 #include <mln/logical/not.hh>
39 
40 
41 int
42 main()
43 {
44  using namespace mln;
45 
46  // Exercise the computation of 2D connectivity numbers using the
47  // look-up table.
48  box2d b = make::box2d(-1, -1,
49  +1, +1);
50  image2d<bool> ima(b);
51  data::fill(ima, false);
52 
53  point2d p(0, 0);
54  mln_niter_(neighb2d) n(c4(), p);
55  for_all(n)
56  ima(n) = true;
57  /* Test case 1.
58  ima =
59 
60  - | -
61  | - |
62  - | -
63  */
64  mln_assertion(topo::connectivity_number_2d_c4(ima, p, true) == 4);
65  mln_assertion(topo::connectivity_number_2d_c8(ima, p, true) == 1);
66 
67  logical::not_inplace(ima);
68  ima.at_ (0, 0) = false;
69  /* Test case 2.
70  ima =
71 
72  | - |
73  - - -
74  | - |
75  */
76  mln_assertion(topo::connectivity_number_2d_c4(ima, p, true) == 0);
77  mln_assertion(topo::connectivity_number_2d_c8(ima, p, true) == 4);
78 
79 
80  /* FIXME: Also exercise the direct computation of connectivity
81  numbers, using the number of connected components around the
82  point in the foreground and the background.
83 
84  Possibly move this part in another test, especially if the
85  corresponding routine is located in another file. */
86  // ...
87 }