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[ctsim.git] / libctsupport / normangle.cpp

diff --git a/libctsupport/normangle.cpp b/libctsupport/normangle.cpp
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+/*****************************************************************************
+**  This is part of the CTSim program
+**  Copyright (C) 1983-2000 Kevin Rosenberg
+**
+**  $Id: normangle.cpp,v 1.1 2000/06/19 02:58:08 kevin Exp $
+**
+**  This program is free software; you can redistribute it and/or modify
+**  it under the terms of the GNU General Public License (version 2) as
+**  published by the Free Software Foundation.
+**
+**  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 "kmath.h"
+
+
+/* NAME
+ *    norm_ang                 Normalize angle to 0 to 2 * PI range
+ *
+ * SYNOPSIS
+ *    t = norm_ang (theta)
+ *    double t                 Normalized angle
+ *    double theta             Input angle
+ */
+
+double 
+norm_ang (double theta)
+{
+  while (theta < 0.)
+    theta += TWOPI;
+  while (theta >= TWOPI)
+    theta -= TWOPI;
+  
+  return (theta);
+}