[Repast-developer] Simulating Fire Spread in Repast Simphony

[Novice007 <zha...@12...>]

Hi, 
I used Repast Simphony to simulate fire spread by CA.
Following is my code:
public class FireAgent extends SimpleAgent {
	@Override
	public int isFire() {
		return 1;
	}
	@Override
	@ScheduledMethod(start = 2, interval = 1, priority = 2)		
	public void step() {
		int x,y;
		Context context = ContextUtils.getContext(this);//Get Context
		Grid <SimpleAgent> grid =
(Grid<SimpleAgent>)context.getProjection("Woodland Grid");//Get Grid
		GridPoint point = grid.getLocation(this);		//Get current location
		x=point.getX();
		y=point.getY();
		int iCount=4,xDst,yDst;
		
		VNQuery <SimpleAgent> query=new VNQuery(grid,this);
		Iterator <SimpleAgent> iter=query.query().iterator();
		
		SimpleAgent neighborAgent = null;
		boolean bFire=false;
		boolean bTree=false;
		boolean bFighter=false;
		while (iter.hasNext()) {
			neighborAgent = iter.next();	
			
			point = grid.getLocation(neighborAgent);
			x=point.getX();
			y=point.getY();
			
			for (SimpleAgent agent : grid.getObjectsAt(x, y)) {
				if (agent instanceof FireAgent) {
					bFire = true;
					break;
				}
				if (agent instanceof TreeAgent) {
					bTree = true;
				}

			}

			if(bFire)
				continue;
			if(bTree){
				FireAgent fire = new FireAgent();
				context.add(fire);
				grid.moveTo(fire, x, y);
			}
		}
}

As I ran the model, I found the fire spreading is not following "the Von
Neumann neighborhood ".

There are some pictures I've got.

The model is initializing as the following(at tick 1)
http://www.nabble.com/file/p21599109/fire0.png 

At tick2 :(This step looks correct)
http://www.nabble.com/file/p21599109/fire1.png 

At tick3 : (The fire is only spread toward right, why?)
http://www.nabble.com/file/p21599109/fire2.png 

At tick4: (The fire is still spread toward right)
http://www.nabble.com/file/p21599109/fire3.png 

……

At tick15: （After 15 steps, the fire stop spreading, I got the following
result）
http://www.nabble.com/file/p21599109/fire15.png 

Any feedback would be highly appreciated.

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