Initial revision

git-svn-id: svn://localhost/trunk/ardour2@4 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/pbd3/pbd/scale.h

@@ -0,0 +1,53 @@
+/*
+    Copyright (C) 2000 Paul Barton-Davis 
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+    $Id$
+*/
+
+#ifndef __pbd_scale_h__
+#define __pbd_scale_h__
+
+#include <cmath>
+
+inline float
+scale (float value, float lower, float upper)
+{
+	return fabs (lower + value) / (upper-lower);
+}	
+
+inline float
+scale_with_range (float value, float lower, float range)
+{
+	return fabs (lower + value) / range;
+}	
+
+
+inline float 
+scale_to (float value, float lower, float upper, float to)
+{
+	return (fabs (lower + value) / (upper-lower)) * to;
+}	
+
+inline float
+scale_to_with_range (float value, float lower, float range, float to)
+{
+	return (fabs (lower + value) / range) * to;
+}	
+
+#endif /* __pbd_scale_h__ */
+
+