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· Pheromone.java ·

   1/*
   2 * Pheromone.java
   3 *
   4 * Created on 04 March 2007, 02:37
   5 *
   6 * To change this template, choose Tools | Template Manager
   7 * and open the template in the editor.
   8 */
   9
  10package antgraph;
  11
  12import java.util.ArrayList;
  13import java.util.List;
  14
  15/**
  16 *
  17 * @author James
  18 */
  19public class Pheromone implements Runnable {
  20    
  21    private List<PheromoneParticle> particles = new ArrayList<PheromoneParticle>();
  22    private Thread move;
  23    private int rate = 90000;
  24    
  25    public static enum Direction { TOWARD_NEST, AWAY_FROM_NEST, NONE; }
  26    
  27    /** Creates a new instance of Pheromone */
  28    public Pheromone() {
  29        move = new Thread(this);
  30        move.setDaemon(true);
  31        move.start();
  32    }
  33    
  34    public void run() {
  35        while(move != null) {
  36            
  37            try {
  38            
  39                move.sleep(getRate());
  40                if(particles.size() > 0)  particles.remove(0);
  41                  
  42            }catch (InterruptedException e) {
  43                System.out.println(e);
  44            }
  45            
  46        }
  47    }   
  48
  49    public void increaseStrength(Ant ant, Direction direction) {
  50        particles.add(new PheromoneParticle(ant, direction));
  51    }
  52
  53    public double getStrength() {
  54        return particles.size();
  55    }    
  56    
  57    public void start() {
  58        if(move == null) {
  59            move = new Thread(this);
  60            move.setDaemon(true);
  61            move.start();
  62        }
  63            
  64    }
  65    
  66    public void stop() {
  67        move = null;
  68    }    
  69 
  70
  71    public Direction getDirection() {
  72        if(particles.size() == 0) return Direction.NONE;
  73         
  74        int toward_nest = 0;
  75        int away_from_nest = 0;
  76          
  77        for(PheromoneParticle p : particles) {
  78            if(p.getDirection() == Direction.AWAY_FROM_NEST)
  79                away_from_nest++;
  80            else if(p.getDirection() == Direction.TOWARD_NEST)
  81                toward_nest++;
  82        }
  83       
  84        return toward_nest > away_from_nest ? Direction.TOWARD_NEST : Direction.AWAY_FROM_NEST;
  85
  86    }
  87
  88    public Direction getDirection(Ant ant) {
  89        if(particles.size() == 0) return Direction.NONE;
  90         
  91        int toward_nest = 0;
  92        int away_from_nest = 0;
  93          
  94        for(PheromoneParticle p : particles) {
  95            if(!p.getAnt().equals(ant)) continue;
  96            
  97            if(p.getDirection() == Direction.AWAY_FROM_NEST)
  98                away_from_nest++;
  99            else if(p.getDirection() == Direction.TOWARD_NEST)
 100                toward_nest++;
 101        }
 102       
 103        return toward_nest > away_from_nest ? Direction.TOWARD_NEST : Direction.AWAY_FROM_NEST;
 104
 105    }    
 106    
 107    public boolean laidBy(Ant ant) {
 108        for(PheromoneParticle p : particles) {
 109            if(p.getAnt().equals(ant)) return true;
 110        }
 111        
 112        return false;
 113    }    
 114    
 115    public String toString() {
 116        return getDirection().toString();
 117    }
 118
 119    public int getRate() {
 120        return rate;
 121    }
 122
 123    public void setRate(int rate) {
 124        this.rate = rate;
 125    }
 126}
 127

· Pheromone.java ends ·

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