Michael Bayne
b6f5317ad2
git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@158 ed5b42cb-e716-0410-a449-f6a68f950b19
82 lines
2.2 KiB
Java
82 lines
2.2 KiB
Java
//
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// $Id$
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//
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// Nenya library - tools for developing networked games
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// Copyright (C) 2002-2007 Three Rings Design, Inc., All Rights Reserved
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// http://www.threerings.net/code/nenya/
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.threerings.media.util;
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/**
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* Used to compute a trailing average of a value.
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*/
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public class TrailingAverage
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{
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/**
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* Creates a trailing average instance with the default number of
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* values used to compute the average (10).
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*/
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public TrailingAverage ()
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{
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this(10);
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}
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/**
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* Creates a trailing average instance with the specified number of
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* values used to compute the average.
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*/
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public TrailingAverage (int history)
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{
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_history = new int[history];
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}
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/**
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* Records a new value.
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*/
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public void record (int value)
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{
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_history[_index++%_history.length] = value;
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}
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/**
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* Returns the current averaged value.
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*/
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public int value ()
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{
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int end = Math.min(_history.length, _index);
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int value = 0;
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for (int ii = 0; ii < end; ii++) {
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value += _history[ii];
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}
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return (end > 0) ? (value/end) : 0;
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}
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/**
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* Returns the current trailing average value as a string.
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*/
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public String toString ()
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{
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return Integer.toString(value());
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}
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/** The history of values. */
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protected int[] _history;
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/** The index where we will next record a value. */
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protected int _index;
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}
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