content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library 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 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library 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 library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
   * in the United States and other countries.]
   *
   * -------------------
   * LineFunction2D.java
   * -------------------
   * (C) Copyright 2002-2008, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes:
   * --------
   * 01-Oct-2002 : Version 1 (DG);
   *
   */
  
  package org.jfree.data.function;
  
  /**
   * A function in the form y = a + bx.
   */
  public class LineFunction2D implements Function2D {
  
      /** The intercept. */
      private double a;
  
      /** The slope of the line. */
      private double b;
  
      /**
       * Constructs a new line function.
       *
       * @param a  the intercept.
       * @param b  the slope.
       */
      public LineFunction2D(double a, double b) {
          this.a = a;
          this.b = b;
      }
  
      /**
       * Returns the function value.
       *
       * @param x  the x-value.
       *
       * @return The value.
       */
      public double getValue(double x) {
          return this.a + this.b * x;
      }
  
  }
  