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.]
   *
   * -----------
   * Vector.java
   * -----------
   * (C) Copyright 2007, 2008, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 30-Jan-2007 : Version 1 (DG);
   * 24-May-2007 : Added getLength() and getAngle() methods, thanks to
   *               matinh (DG);
   * 25-May-2007 : Moved from experimental to the main source tree (DG);
   *
   */
  
  package org.jfree.data.xy;
  
  import java.io.Serializable;
  
  /**
   * A vector.
   *
   * @since 1.0.6
   */
  public class Vector implements Serializable {
  
      /** The vector x. */
      private double x;
  
      /** The vector y. */
      private double y;
  
      /**
       * Creates a new instance of <code>Vector</code>.
       *
       * @param x  the x-component.
       * @param y  the y-component.
       */
      public Vector(double x, double y) {
          this.x = x;
          this.y = y;
      }
  
      /**
       * Returns the x-value.
       *
       * @return The x-value.
       */
      public double getX() {
          return this.x;
      }
  
      /**
       * Returns the y-value.
       *
       * @return The y-value.
       */
      public double getY() {
          return this.y;
      }
  
      /**
       * Returns the length of the vector.
       *
       * @return The vector length.
       */
      public double getLength() {
          return Math.sqrt((this.x * this.x) + (this.y * this.y));
      }
  
      /**
       * Returns the angle of the vector.
       *
       * @return The angle of the vector.
       */
      public double getAngle() {
          return Math.atan2(this.y, this.x);
      }
  
      /**
       * Tests this vector for equality with an arbitrary object.
       *
       * @param obj  the object (<code>null</code> not permitted).
       *
       * @return A boolean.
       */
      public boolean equals(Object obj) {
          if (obj == this) {
              return true;
          }
          if (!(obj instanceof Vector)) {
              return false;
          }
          Vector that = (Vector) obj;
          if (this.x != that.x) {
              return false;
          }
          if (this.y != that.y) {
              return false;
          }
          return true;
      }
  
      /**
       * Returns a hash code for this instance.
       *
       * @return A hash code.
       */
      public int hashCode() {
          int result = 193;
          long temp = Double.doubleToLongBits(this.x);
          result = 37 * result + (int) (temp ^ (temp >>> 32));
          temp = Double.doubleToLongBits(this.y);
          result = 37 * result + (int) (temp ^ (temp >>> 32));
          return result;
      }
  
  }
  