001/* =========================================================== 002 * JFreeChart : a free chart library for the Java(tm) platform 003 * =========================================================== 004 * 005 * (C) Copyright 2000-2013, by Object Refinery Limited and Contributors. 006 * 007 * Project Info: http://www.jfree.org/jfreechart/index.html 008 * 009 * This library is free software; you can redistribute it and/or modify it 010 * under the terms of the GNU Lesser General Public License as published by 011 * the Free Software Foundation; either version 2.1 of the License, or 012 * (at your option) any later version. 013 * 014 * This library is distributed in the hope that it will be useful, but 015 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 016 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 017 * License for more details. 018 * 019 * You should have received a copy of the GNU Lesser General Public 020 * License along with this library; if not, write to the Free Software 021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 022 * USA. 023 * 024 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 025 * Other names may be trademarks of their respective owners.] 026 * 027 * --------------- 028 * Function2D.java 029 * --------------- 030 * (C) Copyright 2002-2008, by Object Refinery Limited. 031 * 032 * Original Author: David Gilbert (for Object Refinery Limited); 033 * Contributor(s): -; 034 * 035 * Changes: 036 * -------- 037 * 01-Oct-2002 : Version 1 (DG); 038 * 20-Jan-2005 : Minor Javadoc update (DG); 039 * 040 */ 041 042package org.jfree.data.function; 043 044/** 045 * A function of the form <code>y = f(x)</code>. 046 */ 047public interface Function2D { 048 049 /** 050 * Returns the value of the function ('y') for a given input ('x'). 051 * 052 * @param x the x-value. 053 * 054 * @return The function value. 055 */ 056 public double getValue(double x); 057 058}