/*
 * $Id: Range2D.java,v 1.3 2001/02/09 18:42:30 dwd Exp $
 *
 * This software is provided by NOAA for full, free and open release.  It is
 * understood by the recipient/user that NOAA assumes no liability for any
 * errors contained in the code.  Although this software is released without
 * conditions or restrictions in its use, it is expected that appropriate
 * credit be given to its author and to the National Oceanic and Atmospheric
 * Administration should the software be included by the recipient as an
 * element in other product development.
 */

package sgtplot.util;
 
/**
 * Contains minimum, maximum, and delta double values. 
 *
 * @author Donald Denbo
 * @verstion $Revision: 1.3 $ $Date: 2001/02/09 18:42:30 $ 
 * @since sgtplot 1.0
 */
public class Range2D implements java.io.Serializable, Cloneable {
  /**
	 * 
	 */
	private static final long serialVersionUID = 1L;
/** The range's first value  */
  public double start;
  /** The range's last value  */
  public double end;
  /**  The value of the increment  */
  public double delta;
  /**
   * Default constructor.
   */
  public Range2D() {
    this(Double.NaN, Double.NaN, Double.NaN);
  }
  /**
   * Construct Range2D with start and end. Default for
   * delta is NaN
   *
   * @param ustart first value
   * @param uend last value
   */
  public Range2D(double ustart,double uend) {
    this(ustart, uend, Double.NaN);
  }
  /**
   * Range2D constructor. 
   *
   * @param ustart first value
   * @param uend last value
   * @param udel increment value
   */
  public Range2D(double ustart,double uend,double udel) {
    start = ustart;
    end = uend;
    delta = udel;
  }
  /**
   * Adds the Range2D object to this
   * Range2D. The resulting Range2D is
   * the smallest Range2D that contains both the
   * origial Range2D and the specified 
   * Range2D.
   */
  public void add(Range2D range) {
    start = Math.min(start, range.start);
    end = Math.max(end, range.end);
  }
  /**
   * Test for equality.  Both start, end, and delta must be equal for
   * equality. 
   */
  public boolean equals(Range2D r) {
    if(!Double.isNaN(start) && !Double.isNaN(r.start)) {
      if(Double.isNaN(start) || Double.isNaN(r.start)) return false;
      if(start != r.start) return false;
    }
    if(!Double.isNaN(end) && !Double.isNaN(r.end)) {
      if(Double.isNaN(end) || Double.isNaN(r.end)) return false;
      if(end != r.end) return false;
    }
    if(!Double.isNaN(delta) && !Double.isNaN(r.delta)) {
      if(Double.isNaN(delta) || Double.isNaN(r.delta)) return false;
      if(delta != r.delta) return false;
    }
    return true;
  }
  public String toString() {
    StringBuffer buf = new StringBuffer(50);
    buf.append("[").append(start).append(";").append(end);
    if(Double.isNaN(delta)) {
      buf.append("]");
    } else {
      buf.append(";").append(delta).append("]");
    }
    return buf.toString();
  }
  /**
   * Create a copy of Range2D object.
   */
  public Range2D copy() {
    try {
      return (Range2D)clone();
    } catch (CloneNotSupportedException e) {
      return null;
    }
  }
}