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+#ifndef mathutil_hh
+#define mathutil_hh
+// mathutil.hh
+// robert - programme du robot 2005. {{{
+//
+// Copyright (C) 2005 Nicolas Schodet
+//
+// Robot APB Team/Efrei 2005.
+// Web: http://assos.efrei.fr/robot/
+// Email: robot AT efrei DOT fr
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+//
+// }}}
+#include <cmath>
+
+/// Normalise l'angle entre -pi et +pi.
+double
+angleNorm (double a);
+
+/// Converti en coordonnées polaires.
+void
+toPolar (double x, double y, double &r, double &a);
+
+/// Normalise l'angle en [-pi..+pi).
+inline double
+angleNorm (double a)
+{
+ while (a >= M_PI)
+ a -= 2.0 * M_PI;
+ while (a < -M_PI)
+ a += 2.0 * M_PI;
+ return a;
+}
+
+/// Converti en coordonnées polaires.
+inline void
+toPolar (double x, double y, double &r, double &a)
+{
+ // Rayon.
+ r = sqrt (x * x + y * y);
+ a = y > 0 ? acos (x / r) : -acos (x / r);
+}
+
+#endif // mathutil_hh