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+#ifndef intersection_h
+#define intersection_h
+/* intersection.h */
+/* avr.math.geometry - Geometry math module. {{{
+ *
+ * Copyright (C) 2012 Nicolas Schodet
+ *
+ * APBTeam:
+ * Web: http://apbteam.org/
+ * Email: team AT apbteam DOT org
+ *
+ * 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 "modules/math/geometry/vect.h"
+
+/** Test intersection between two line segments. Return non zero if they
+ * intersect.
+ * - a, b: first line segment vertices.
+ * - c, d: second line segment vertices.
+ *
+ * If AB and CD are parallel, consider there is no intersection. */
+uint8_t
+intersection_segment_segment (const vect_t *a, const vect_t *b,
+ const vect_t *c, const vect_t *d);
+
+#endif /* intersection_h */