orbitingbody.java

Massively Multiplayer Space Trading and Combat game. This is an online strategy game, not a 3D space

/*
 * OrbitingBody.java
 *
 * Copyright (C) 2000 Jason M. Hanley
 * Released under the GNU General Public License (GPL)
 * See license.txt for additional information.
 *
 * Created on July 30, 2000, 10:17 PM
 */
 
package fate.world;

import java.io.*;

/** 
 * Base class for any orbiting object in the universe.
 *
 * @author  [e-mail]
 * @version 0.1.0
 */
public class OrbitingBody extends WorldObject
    implements Comparable, Serializable {

  /** Position along the circumference of orbit, in radians */
  public double position;
  
  /** Distance from the central object, no specific unit */
  public int distance;
  
  /** Orbiting Speed: position delta in an update interval.
      Positive is clockwise, Negative is counter-clockwise */
  public double velocity;

  /** Creates new OrbitingBody */
  public OrbitingBody() {
    super();
    
    position = 0.0;
    distance = 0;
    velocity = 0.0;
  }
  
  /** Calculate X coordinate */
  public int x() {
    double retx = Math.cos( position );
    retx *= distance;
    return (int)Math.round( retx );
  }
  
  /** Calculate Y coordinate */
  public int y() {
    double rety = Math.sin( position );
    rety *= distance;
    return (int)Math.round( rety );
  }
  
  /** Compare two OrbitingBody objects (for sorting) */
  public int compareTo( Object o ) {
    Integer intOther = new Integer( ((OrbitingBody)o).distance );
    return (new Integer( distance )).compareTo( intOther );
  }
}