44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
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// util.hxx - general-purpose utility functions.
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// Copyright (C) 2002 Curtis L. Olson - curt@me.umn.edu
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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#ifndef __UTIL_HXX
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#define __UTIL_HXX 1
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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/**
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* Move a value towards a target.
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*
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* This function was originally written by Alex Perry.
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*
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* @param current The current value.
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* @param target The target value.
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* @param timeratio The percentage of smoothing time that has passed
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* (elapsed time/smoothing time)
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* @return The new value.
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*/
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extern double fgGetLowPass (double current, double target, double timeratio);
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#endif // __UTIL_HXX
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