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GNU Lesser General Public License
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/* * wiigee - accelerometerbased gesture recognition * Copyright (C) 2007, 2008, 2009 Benjamin Poppinga * /*from w w w. j a v a 2s . c o m*/ * Developed at University of Oldenburg * Contact: wiigee@benjaminpoppinga.de * * This file is part of wiigee. * * wiigee is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ package org.wiigee.filter; /** * Abstract class to give a definition for a general filter. * * @author Benjamin 'BePo' Poppinga */ public abstract class Filter { /*** * The actual called method to filter anything. It checks if the vector is * already set to NULL by another filter and won't process it anymore. If it's * not NULL it would be forwarded to the actual implemented method - filterAlgorithm(). * @param vector The acceleration vector, encoding: 0/x, 1/y, 2/z * @return a new, filtered acceleration vector, encoded the same way */ public double[] filter(double[] vector) { if(vector==null) { return null; } else { return filterAlgorithm(vector); } } /*** * A filter receives a triple of acceleration values within the variable 'vector'. * It's encoded as vector[0]=x, vector[1]=y, vector[2]=z. This is not an object since the * processing of the filter should be really fast, since every acceleration of the wiimote * passes the filter. * @param vector * @param absvalue * @return */ abstract public double[] filterAlgorithm(double[] vector); abstract public void reset(); }