Milena (Olena)  User documentation 2.0a Id
snake_vert.hh
00001 // Copyright (C) 2007, 2008, 2009, 2011 EPITA Research and Development
00002 // Laboratory (LRDE)
00003 //
00004 // This file is part of Olena.
00005 //
00006 // Olena is free software: you can redistribute it and/or modify it under
00007 // the terms of the GNU General Public License as published by the Free
00008 // Software Foundation, version 2 of the License.
00009 //
00010 // Olena is distributed in the hope that it will be useful,
00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013 // General Public License for more details.
00014 //
00015 // You should have received a copy of the GNU General Public License
00016 // along with Olena.  If not, see <http://www.gnu.org/licenses/>.
00017 //
00018 // As a special exception, you may use this file as part of a free
00019 // software project without restriction.  Specifically, if other files
00020 // instantiate templates or use macros or inline functions from this
00021 // file, or you compile this file and link it with other files to produce
00022 // an executable, this file does not by itself cause the resulting
00023 // executable to be covered by the GNU General Public License.  This
00024 // exception does not however invalidate any other reasons why the
00025 // executable file might be covered by the GNU General Public License.
00026 
00027 #ifndef MLN_CANVAS_BROWSING_SNAKE_VERT_HH
00028 # define MLN_CANVAS_BROWSING_SNAKE_VERT_HH
00029 
00033 
00034 # include <mln/core/concept/browsing.hh>
00035 # include <mln/geom/size2d.hh>
00036 
00037 
00038 namespace mln
00039 {
00040 
00041   namespace canvas
00042   {
00043 
00044     namespace browsing
00045     {
00046 
00048 
00084       struct snake_vert_t : public Browsing< snake_vert_t >
00085       {
00086         // This default constructor is needed for compilation with gcc
00087         // 4.6.0, gcc 4.6.1 and Clang.
00088         snake_vert_t();
00089 
00090         template <typename F>
00091         void operator()(F& f) const;
00092       };
00093 
00094       extern const snake_vert_t snake_vert;
00095 
00096 # ifndef MLN_INCLUDE_ONLY
00097 
00098 #  ifndef MLN_WO_GLOBAL_VARS
00099 
00100       const snake_vert_t snake_vert;
00101 
00102 #  endif // ! MLN_WO_GLOBAL_VARS
00103 
00104       inline
00105       snake_vert_t::snake_vert_t()
00106       {
00107       }
00108 
00109       template <typename F>
00110       inline
00111       void
00112       snake_vert_t::operator()(F& f) const
00113       {
00114         // Fixme: check the dimension of the input
00115 //      mlc_equal(mln_trait_image_dimension(I)(),
00116 //                trait::image::dimension::two_d)::check();
00117         trace::entering("canvas::browsing::snake_vert");
00118         mln_precondition(f.input.is_valid());
00119         int
00120           min_row = geom::min_row(f.input), max_row = geom::max_row(f.input),
00121           min_col = geom::min_col(f.input), max_col = geom::max_col(f.input);
00122 
00123         // p
00124         f.p = f.input.bbox().pmin();
00125         def::coord& row = f.p.row();
00126         def::coord& col = f.p.col();
00127 
00128         // initialization
00129         f.init();
00130 
00131         bool down = true;
00132         for (col = min_col; col <= max_col; ++col)
00133           // FIXME: Add "if (f.input.has(p))"?
00134           {
00135             // go fwd
00136             f.fwd();
00137 
00138             if (down)
00139               // browse col down.
00140               while (row < max_row)
00141                 {
00142                   ++row;
00143                   f.down();
00144                 }
00145             else
00146               // browse col up.
00147               while (row > min_row)
00148                 {
00149                   --row;
00150                   f.up();
00151                 }
00152 
00153             // change browsing
00154             down = ! down;
00155           }
00156         trace::exiting("canvas::browsing::snake_vert");
00157       }
00158 
00159 # endif // ! MLN_INCLUDE_ONLY
00160 
00161     } // end of namespace mln::canvas::browsing
00162 
00163   } // end of namespace mln::canvas
00164 
00165 } // end of namespace mln
00166 
00167 
00168 #endif // ! MLN_CANVAS_BROWSING_SNAKE_VERT_HH
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