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Diffstat (limited to 'libs/pbd3/pbd/scale.h')
-rw-r--r-- | libs/pbd3/pbd/scale.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/libs/pbd3/pbd/scale.h b/libs/pbd3/pbd/scale.h new file mode 100644 index 0000000000..0384ae52aa --- /dev/null +++ b/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__ */ + + |