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_BACKDIAGONAL2D_HH 00028 # define MLN_CANVAS_BROWSING_BACKDIAGONAL2D_HH 00029 00033 00034 # include <mln/core/concept/browsing.hh> 00035 # include <mln/core/concept/image.hh> 00036 00037 00038 namespace mln 00039 { 00040 00041 namespace canvas 00042 { 00043 00044 namespace browsing 00045 { 00046 00048 00083 struct backdiagonal2d_t : public Browsing< backdiagonal2d_t > 00084 { 00085 // This default constructor is needed for compilation with gcc 00086 // 4.6.0, gcc 4.6.1 and Clang. 00087 backdiagonal2d_t(); 00088 00089 template <typename F> 00090 void operator()(F& f) const; 00091 }; 00092 00093 extern const backdiagonal2d_t backdiagonal2d; 00094 00095 00096 00097 # ifndef MLN_INCLUDE_ONLY 00098 00099 # ifndef MLN_WO_GLOBAL_VARS 00100 00101 const backdiagonal2d_t backdiagonal2d; 00102 00103 # endif // ! MLN_WO_GLOBAL_VARS 00104 00105 inline 00106 backdiagonal2d_t::backdiagonal2d_t() 00107 { 00108 } 00109 00110 template <typename F> 00111 inline 00112 void 00113 backdiagonal2d_t::operator()(F& f) const 00114 { 00115 trace::entering("canvas::browsing::backdiagonal2d"); 00116 00117 typedef typename F::I I; 00118 typedef mln_deduce(I, psite, delta) dpsite; 00119 typedef mln_psite(I) psite; 00120 00121 // Directions 00122 dpsite dp_first(-1, 0); 00123 dpsite dp_second(0, 1); 00124 dpsite dp_diag(1, 1); 00125 00126 mln_deduce(I, psite, delta) diag; 00127 00128 psite 00129 pmin = f.input.domain().pmin(), 00130 pmax = f.input.domain().pmax(); 00131 00132 // Start at the bottom left corner. 00133 f.p[0] = pmax[0]; 00134 f.p[1] = pmin[1]; 00135 00136 f.init(); 00137 00138 while (f.input.domain().has(f.p)) 00139 { 00140 psite start_diag = f.p; 00141 // Browse one diag. 00142 f.init_diag(); 00143 while (f.input.domain().has(f.p)) 00144 { 00145 f.next(); 00146 f.p = f.p + dp_diag; 00147 } 00148 00149 // Goto next diag start. 00150 f.p = start_diag + dp_first; 00151 } 00152 f.p = f.p - dp_first; 00153 00154 f.p = f.p + dp_second; 00155 while (f.input.domain().has(f.p)) 00156 { 00157 psite start_diag = f.p; 00158 00159 // Browse one diag. 00160 f.init_diag(); 00161 while (f.input.domain().has(f.p)) 00162 { 00163 f.next(); 00164 f.p = f.p + dp_diag; 00165 } 00166 f.p = f.p - dp_diag; 00167 00168 // Goto next diag start. 00169 f.p = start_diag + dp_second; 00170 } 00171 00172 f.final(); 00173 trace::exiting("canvas::browsing::backdiagonal2d"); 00174 } 00175 00176 # endif // ! MLN_INCLUDE_ONLY 00177 00178 } // end of namespace mln::canvas::browsing 00179 00180 } // end of namespace mln::canvas 00181 00182 } // end of namespace mln 00183 00184 #endif // ! MLN_CANVAS_BROWSING_BACKDIAGONAL2D_HH