nevrax.org : docs

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
