circles intersection and tourel beacon

[aversive.git] / modules / base / math / geometry / lines.h

diff --git a/modules/base/math/geometry/lines.h b/modules/base/math/geometry/lines.h
index a6cf421..5ae2394 100755 (executable)
--- a/modules/base/math/geometry/lines.h
+++ b/modules/base/math/geometry/lines.h
@@ -1,3 +1,27 @@
+/*
+ *  Copyright Droids Corporation (2009)
+ *
+ *  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
+ *
+ *  Revision : $Id: f16.h,v 1.6.4.3 2008-05-10 15:06:26 zer0 Exp $
+ *
+ */
+
+#ifndef _LINES_H_
+#define _LINES_H_
+
 typedef struct _line {
        double a;
        double b;
@@ -11,10 +35,21 @@ pts2line(const point_t *p1, const point_t *p2, line_t *l);
 void
 proj_pt_line(const point_t * p, const line_t * l, point_t * p_out);
 
-uint8_t 
+/*
+ * return values:
+ *  0 dont cross
+ *  1 cross
+ *  2 "parallel crossing"
+ *
+ *  p argument is the crossing point coordinates (dummy for 0 or 2
+ *  result)
+ */
+uint8_t
 intersect_line(const line_t *l1, const line_t *l2, point_t *p);
 
 uint8_t 
 intersect_segment(const point_t *s1, const point_t *s2, 
                  const point_t *t1, const point_t *t2, 
                  point_t *p);
+
+#endif /* _LINES_H_ */