001/* ===========================================================
002 * JFreeChart : a free chart library for the Java(tm) platform
003 * ===========================================================
004 *
005 * (C) Copyright 2000-2008, 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 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025 * in the United States and other countries.]
026 *
027 * -------------------
028 * LineFunction2D.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 *
039 */
040
041package org.jfree.data.function;
042
043/**
044 * A function in the form y = a + bx.
045 */
046public class LineFunction2D implements Function2D {
047
048    /** The intercept. */
049    private double a;
050
051    /** The slope of the line. */
052    private double b;
053
054    /**
055     * Constructs a new line function.
056     *
057     * @param a  the intercept.
058     * @param b  the slope.
059     */
060    public LineFunction2D(double a, double b) {
061        this.a = a;
062        this.b = b;
063    }
064
065    /**
066     * Returns the function value.
067     *
068     * @param x  the x-value.
069     *
070     * @return The value.
071     */
072    public double getValue(double x) {
073        return this.a + this.b * x;
074    }
075
076}