00001 /* 00002 * SmoothFilter.cc : part of the Mace toolkit for building distributed systems 00003 * 00004 * Copyright (c) 2007, Charles Killian, Dejan Kostic, Ryan Braud, James W. Anderson, John Fisher-Ogden, Calvin Hubble, Duy Nguyen, Justin Burke, David Oppenheimer, Amin Vahdat, Adolfo Rodriguez, Sooraj Bhat 00005 * All rights reserved. 00006 * 00007 * Redistribution and use in source and binary forms, with or without 00008 * modification, are permitted provided that the following conditions are met: 00009 * 00010 * * Redistributions of source code must retain the above copyright 00011 * notice, this list of conditions and the following disclaimer. 00012 * * Redistributions in binary form must reproduce the above copyright 00013 * notice, this list of conditions and the following disclaimer in 00014 * the documentation and/or other materials provided with the 00015 * distribution. 00016 * * Neither the names of Duke University nor The University of 00017 * California, San Diego, nor the names of the authors or contributors 00018 * may be used to endorse or promote products derived from 00019 * this software without specific prior written permission. 00020 * 00021 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00022 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00023 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 00024 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 00025 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00026 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 00027 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 00028 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 00029 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 00030 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00031 * 00032 * ----END-OF-LEGAL-STUFF---- */ 00033 #include "SmoothFilter.h" 00034 smooth_filter::smooth_filter( double smooth_factor) 00035 :samples(0) 00036 { 00037 this->smooth_factor=smooth_factor; 00038 00039 } 00040 smooth_filter::~smooth_filter() 00041 { 00042 } 00043 00044 // ---------------------------------------------- 00045 // update 00046 // ---------------------------------------------- 00047 00048 void smooth_filter::update (double incoming) 00049 { 00050 samples ++; 00051 if (value==0.0) 00052 value=incoming; 00053 else 00054 value = incoming*(1.0 - smooth_factor) + value*(smooth_factor); 00055 } 00056 00057 // ---------------------------------------------- 00058 // age 00059 // ---------------------------------------------- 00060 00061 int smooth_filter::age () 00062 { 00063 value = value*(smooth_factor); 00064 return (int)value; 00065 } 00066 00067 // ---------------------------------------------- 00068 // reset 00069 // ---------------------------------------------- 00070 00071 int smooth_filter::reset () 00072 { 00073 value = 0.0; 00074 return (int)value; 00075 }