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