Milena (Olena)
User documentation 2.0a Id
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00001 // Copyright (C) 2007, 2008, 2009, 2010, 2011 EPITA Research and 00002 // Development 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_GENERIC_HH 00028 # define MLN_CANVAS_BROWSING_SNAKE_GENERIC_HH 00029 00033 00034 # include <vector> 00035 # include <mln/core/concept/browsing.hh> 00036 00037 00038 namespace mln 00039 { 00040 00041 namespace canvas 00042 { 00043 00044 namespace browsing 00045 { 00046 00048 00076 struct snake_generic_t : public Browsing< snake_generic_t > 00077 { 00078 00079 // This default constructor is needed for compilation with gcc 00080 // 4.6.0, gcc 4.6.1 and Clang. 00081 snake_generic_t(); 00082 00083 template <typename F> 00084 void operator()(F& f) const; 00085 00086 }; 00087 00088 extern const snake_generic_t snake_generic; 00089 00090 # ifndef MLN_INCLUDE_ONLY 00091 00092 # ifndef MLN_WO_GLOBAL_VARS 00093 00094 const snake_generic_t snake_generic; 00095 00096 # endif // ! MLN_WO_GLOBAL_VARS 00097 00098 inline 00099 snake_generic_t::snake_generic_t() 00100 { 00101 } 00102 00103 template <typename F> 00104 inline 00105 void 00106 snake_generic_t::operator()(F& f) const 00107 { 00108 trace::entering("canvas::browsing::snake_generic"); 00109 mln_precondition(f.input.is_valid()); 00110 00111 // p init 00112 f.p = f.input.bbox().pmin();// - f.dps[0]; 00113 00114 std::vector< int > directions(f.moves.size(), 0); 00115 unsigned deph = 0; 00116 unsigned total_deph = f.moves.size() / 2 + 1; 00117 00118 // initialization 00119 f.init(); 00120 00121 bool first = true; 00122 directions[deph] = 1; 00123 deph = total_deph - 1; 00124 00125 // Call the move function (for the first point) 00126 (f.*(f.moves[(deph - 1) * 2 - 1 + directions[deph - 1]])) (); 00127 while (deph > 0) // If direction is empty, break 00128 { 00129 mln_assertion(deph <= total_deph); 00130 mln_assertion(deph > 0); 00131 // If f.p is near the border (we ended a direction) -> next child 00132 if (!f.input.domain().has(f.p + 00133 f.dps[(deph - 1) * 2 - 1 + directions[deph - 1]])) 00134 { 00135 // Go up the tree 00136 deph--; 00137 if (deph >= 1) 00138 // Change directions 00139 directions[deph] = directions[deph] == 1 ? 0 : 1; 00140 continue; 00141 } 00142 00143 if (!first) 00144 { 00145 // Move f.p 00146 f.p += f.dps[(deph - 1) * 2 - 1 + directions[deph - 1]]; 00147 // Call the move function 00148 (f.*(f.moves[(deph - 1) * 2 - 1 + directions[deph - 1]])) (); 00149 } 00150 else 00151 first = false; 00152 00153 if (deph != total_deph) 00154 { 00155 // Go down the tree 00156 deph++; 00157 first = true; 00158 } 00159 } 00160 00161 trace::exiting("canvas::browsing::snake_generic"); 00162 } 00163 00164 # endif // ! MLN_INCLUDE_ONLY 00165 00166 } // end of namespace mln::canvas::browsing 00167 00168 } // end of namespace mln::canvas 00169 00170 } // end of namespace mln 00171 00172 00173 #endif // ! MLN_CANVAS_BROWSING_SNAKE_GENERIC_HH