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00001 
00007 /* Copyright, 2001 Nevrax Ltd.
00008  *
00009  * This file is part of NEVRAX NEL.
00010  * NEVRAX NEL is free software; you can redistribute it and/or modify
00011  * it under the terms of the GNU General Public License as published by
00012  * the Free Software Foundation; either version 2, or (at your option)
00013  * any later version.
00014 
00015  * NEVRAX NEL is distributed in the hope that it will be useful, but
00016  * WITHOUT ANY WARRANTY; without even the implied warranty of
00017  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
00018  * General Public License for more details.
00019 
00020  * You should have received a copy of the GNU General Public License
00021  * along with NEVRAX NEL; see the file COPYING. If not, write to the
00022  * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
00023  * MA 02111-1307, USA.
00024  */
00025 
00026 #include "stdmisc.h"
00027 
00028 #include "nel/misc/value_smoother.h"
00029 
00030 
00031 using namespace std;
00032 
00033 
00034 namespace NLMISC 
00035 {
00036 
00037 
00038 CValueSmoother::CValueSmoother(uint n)
00039 {
00040         nlassert(n!=0);
00041         init(n);
00042 }
00043 
00044 void            CValueSmoother::reset()
00045 {
00046         fill(_LastFrames.begin(), _LastFrames.end(), 0);
00047 
00048         _CurFrame= 0;
00049         _NumFrame= 0;
00050         _FrameSum= 0;
00051 }
00052 
00053 void            CValueSmoother::init(uint n)
00054 {
00055         nlassert(n!=0);
00056 
00057         // reset all the array to 0.
00058         _LastFrames.clear();
00059         _LastFrames.resize(n, 0);
00060 
00061         _CurFrame= 0;
00062         _NumFrame= 0;
00063         _FrameSum= 0;
00064 }
00065 
00066 void            CValueSmoother::addValue(float dt)
00067 {
00068         // update the frame sum. NB: see init(), at start, array is full of 0. so it works even for un-inited values.
00069         _FrameSum-= _LastFrames[_CurFrame];
00070         _FrameSum+= dt;
00071 
00072         // bkup this value in the array.
00073         _LastFrames[_CurFrame]= dt;
00074 
00075         // next frame.
00076         _CurFrame++;
00077         _CurFrame%=_LastFrames.size();
00078 
00079         // update the number of frames added.
00080         _NumFrame++;
00081         _NumFrame= min(_NumFrame, _LastFrames.size());
00082 }
00083 
00084 float           CValueSmoother::getSmoothValue()
00085 {
00086         if(_NumFrame)
00087                 return _FrameSum / _NumFrame;
00088         else
00089                 return 0;
00090 }
00091 
00092 
00093 
00094 } // NLMISC
value_smoother.cpp
