Wall.java

package firesimulator.world;

import java.awt.Point;
import java.util.Iterator;

import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.Log;

/**
 * @author tn
 *
 */
public class Wall {
    private static final Log LOG = LogFactory.getLog(Wall.class);
	
	public static int MAX_SAMPLE_DISTANCE = 50000;
    public int x1;
	public int y1;
	public int x2;
	public int y2;
	public Building owner;
	public int rays;
	public int hits;
	public int selfHits;
	public int strange;
	public static float RAY_RATE=0.01f;
	public double length;
	Point a;
	Point b;	
	
	public Wall(int x1, int y1, int x2, int y2, Building owner){		
		this.x1=x1;
		this.y1=y1;
		this.x2=x2;
		this.y2=y2;
		a=new Point(x1,y1);
		b=new Point(x2,y2);
		length=a.distance(b);
		rays=(int)Math.ceil(length*RAY_RATE);
		hits=0;
		this.owner=owner;
	}
	
	public boolean validate(){
		return!(a.x==b.x&&a.y==b.y);
	}

	public void findHits(World world) {
		selfHits=0;
		strange=0;
		for(int emitted=0;emitted<rays;emitted++){			
			//creating ray
			Point start=firesimulator.util.Geometry.getRndPoint(a,b);
			if(start==null){
				strange++;
				LOG.debug("strange -> "+a.x+","+a.y+"/"+b.x+","+b.y);
				continue;
			}
			Point end=firesimulator.util.Geometry.getRndPoint(start,MAX_SAMPLE_DISTANCE);			
			//intersect
			Wall closest=null;
			double minDist=Double.MAX_VALUE;
			for(Iterator it=world.allWalls.iterator();it.hasNext();){				
				Wall other=(Wall)it.next();
				if(other==this) continue;
				Point cross=firesimulator.util.Geometry.intersect(start,end,other.a,other.b);
				if(cross!=null){
					if(cross.distance(start)<minDist){
						minDist=cross.distance(start);
						closest=other;
					}
				}				
			}			
            if(closest == null){
                //Nothing was hit
                continue;
            }
			if(closest.owner==this.owner){
                //The source building was hit
				selfHits++;
            }
			if(closest!=this&&closest!=null&&closest.owner!=owner){
				hits++;				
				Integer value=(Integer)owner.connectedBuildings.get(closest.owner);
                int temp = 0;
				if(value != null){
					temp = value.intValue();
				}				
				temp++;
				owner.connectedBuildings.put(closest.owner,new Integer(temp));
			}						
		}		
	}
	
	public String toString(){
		return "wall ("+a.x+","+a.y+")-("+b.x+","+b.y+"), length="+length+"mm, rays="+rays;
	}

}