/*
 * Copyright (c) 2009 Anthony Steed and Manuel Fradinho Oliveira
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the 
 * following conditions are met:
 * 1. Redistributions of source code must retain the above
 *    copyright notice, this list of conditions and the 
 *    following disclaimer.
 * 2. Redistributions in binary form must reproduce the above 
 *    copyright notice, this list of conditions and the 
 *    following disclaimer in the documentation and/or other 
 *    materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of 
 *    this software must display the following acknowledgement:
 *       This product includes software from the book "Networked 
 *       Graphics" written by Anthony Steed and Manuel Fradinho
 *       Oliveira published by Morgan Kaufmann
 * 4. Neither the name of the University nor of the Department
 *    may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 * 5. Neither the name of Cyntelix may be used to enforese or 
 *    promote products derived from this software without prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS 
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, 
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO 
 * EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE FOR ANY 
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION). HOWEVER CAUSED 
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Contact Info: Anthony Steed
 *               a.steed@cs.ucl.ac.uk
 *
 *               Manuel Fradinho Oliveira
 *               mfradinho@cyntelix.com
 *
 */
import javax.media.j3d.*;
import javax.vecmath.*;

class BoidShape extends TriangleArray { 
  private static final float[] verts = {
    0.8f,  0.3f,  0.4f, // 2
    0.0f,  0.0f, -1.0f, // 1
    0.0f,  0.0f,  0.0f, // 0
    0.0f,  0.0f, -1.0f, // 1
   -0.8f,  0.3f,  0.4f,  // 3
    0.0f,  0.0f,  0.0f, // 0
    0.0f, -0.1f,  0.0f, // 4
   -0.8f,  0.3f,  0.4f,  // 3
    0.0f,  0.0f, -1.0f, // 1
    0.8f,  0.3f,  0.4f, // 2
    0.0f, -0.1f,  0.0f, // 4
    0.0f,  0.0f, -1.0f, // 1
    0.0f,  0.0f,  0.0f, // 0
    0.0f, -0.1f,  0.0f, // 4
    0.8f,  0.3f,  0.4f, // 2
    0.0f,  0.0f,  0.0f, // 0
   -0.8f,  0.3f,  0.4f,  // 3
    0.0f, -0.1f,  0.0f, // 4
  };
  
  public BoidShape (Color3f colour) {
    super(18, GeometryArray.COORDINATES | GeometryArray.COLOR_3);
    setColor(0,colour);
    setCoordinates(0, verts);
  }
}

public class Boid extends TransformGroup {
  Shape3D   _geom;
  Vector3f  _position;
  Vector3f  _velocity;
  static Vector3f _world_min_pt = new Vector3f(-10.0f, -10.0f, -10.0f);
  static Vector3f _world_max_pt = new Vector3f(10.0f, 10.0f, 10.0f);

  static float    BOUND_VELOCITY = 0.2f;
  
  public Boid() {
    this(0.1f, 0.8f, 0.3f);  
  }
  
  public Boid(float red, float green, float blue) {
    this(new Color3f(red, green, blue));
  }

  public Boid(Color3f colour) {
    _position = new Vector3f();
    _velocity = new Vector3f();
    setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    _geom = new Shape3D();
    _geom.setGeometry(new BoidShape(colour));
    addChild(_geom);
  }
  
  public void worldConstraints() {
    if (_position.x > _world_max_pt.x)
      _velocity.x += -BOUND_VELOCITY;
    if (_position.x < _world_min_pt.x) 
      _velocity.x += BOUND_VELOCITY;
    if (_position.y > _world_max_pt.y) 
      _velocity.y += -BOUND_VELOCITY;
    if (_position.y < _world_min_pt.y) 
      _velocity.y += BOUND_VELOCITY;
    if (_position.z > _world_max_pt.z) 
      _velocity.z += -BOUND_VELOCITY;
    if (_position.z < _world_min_pt.z) 
      _velocity.z += BOUND_VELOCITY;
  }
  
  public void randomPos() {
    _position.x = _world_min_pt.x + ((_world_max_pt.x - _world_min_pt.x)*(float)Math.random());  
    _position.y = _world_min_pt.y + ((_world_max_pt.y - _world_min_pt.y)*(float)Math.random());  
    _position.z = _world_min_pt.z + ((_world_max_pt.z - _world_min_pt.z)*(float)Math.random());  
    _velocity.x = 0;  
    _velocity.y = 0;  
    _velocity.z = 0;  
  }

  public String toString() {
    StringBuffer str = new StringBuffer();
    str.append(_position.x);
    str.append('@');
    str.append(_position.y);
    str.append('@');
    str.append(_position.z);
    str.append('@');
    str.append(_velocity.x);
    str.append('@');
    str.append(_velocity.y);
    str.append('@');
    str.append(_velocity.z);
    return str.toString();
  }

  public void unpackString(String str) {
    int index = str.indexOf('@');
    _position.x = Float.valueOf(str.substring(0,index));
    str = str.substring(index+1);
    index = str.indexOf('@');
    _position.y = Float.valueOf(str.substring(0,index));
    str = str.substring(index+1);
    index = str.indexOf('@');
    _position.z = Float.valueOf(str.substring(0,index));
    str = str.substring(index+1);
    index = str.indexOf('@');
    _velocity.x = Float.valueOf(str.substring(0,index));
    str = str.substring(index+1);
    index = str.indexOf('@');
    _velocity.y = Float.valueOf(str.substring(0,index));
    str = str.substring(index+1);
    _velocity.z = Float.valueOf(str);
  }
}