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backdiag2d.hh
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25 
26 #ifndef MLN_WIN_BACKDIAG2D_HH
27 # define MLN_WIN_BACKDIAG2D_HH
28 
32 
33 # include <mln/core/internal/classical_window_base.hh>
34 # include <mln/core/alias/dpoint2d.hh>
35 
36 
37 namespace mln
38 {
39 
41 
42 
43  namespace win
44  {
45 
63  struct backdiag2d : public internal::classical_window_base< dpoint2d, backdiag2d >
64  {
71  backdiag2d(unsigned length);
72 
75  unsigned length() const;
76 
80  unsigned delta_() const;
81 
82  void print_(std::ostream& ostr) const;
83 
84  protected:
85  unsigned length_;
86  };
87 
88 
89 
90 # ifndef MLN_INCLUDE_ONLY
91 
92  inline
93  backdiag2d::backdiag2d(unsigned length)
94  : length_(length)
95  {
96  mln_precondition(length % 2 == 1);
97  const def::coord
98  dcol = static_cast<def::coord>(length / 2),
99  minus_dcol = static_cast<def::coord>(- dcol);
100  for (def::coord col = minus_dcol; col <= dcol; ++col)
101  insert(dpoint2d(col, col));
102  }
103 
104  inline
105  unsigned backdiag2d::length() const
106  {
107  return length_;
108  }
109 
110  inline
111  unsigned backdiag2d::delta_() const
112  {
113  return length_ / 2;
114  }
115 
116  inline
117  void backdiag2d::print_(std::ostream& ostr) const
118  {
119  ostr << "[backdiag 2d: length=" << length_ << ']';
120  }
121 
122 # endif // ! MLN_INCLUDE_ONLY
123 
124  } // end of namespace mln::win
125 
126 } // end of namespace mln
127 
128 
129 
130 #endif // ! MLN_WIN_BACKDIAG2D_HH