Ray casting

 
import greenfoot.*;
 
public class MiniRed extends Actor
 
{
 
    private int charge = 0;
 
    int removeTimer=0,count=0;
 
    Ray ray=new Ray();
 
    private int shotTime;
 
    public MiniRed(int speed, int rate)
 
    {
 
        charge = rate;
 
        getImage().scale(25, 25);
 
        ray.setImage(new GreenfootImage(1,1));
 
    }
 
    protected void addedToWorld(World world)
 
    {
 
      world.addObject(ray, 0,0);
 
    }
 
    public void act() 
 
    {
 
      MyWorld world1 = (MyWorld) getWorld();
 
      if(getWorld()!=null && getWorld().getObjects(B.class).size()>0)
 
      {
 
         B b = getWorld().getObjects(B.class).get(0);
 
         setLocation(b.getX(), b.getY()+75);
 
      }
 
      
 
      if(isTouching(MiniRed.class))
 
      setLocation(getX()-40, getY());
 
      
 
      if(isTouching(Stone.class) || isTouching(EnemyTank.class) || getWorld().getObjects(B.class).isEmpty() || isTouching(Crate.class))
 
      {
 
            getImage().setTransparency(0);
 
      }
 
      else if(!isTouching(EnemyTank.class) || !isTouching(Crate.class) 
 
      || !isTouching(Stone.class) || !getWorld().getObjects(B.class).isEmpty()) 
 
      getImage().setTransparency(255);
 
      
 
      shotTime=(shotTime+1)%40;
 
      if(shotTime!=0)
 
      return;
 
      
 
      if(getWorld()!=null && getWorld().getObjects(EnemyTank.class).size()>0  && getWorld().getObjects(B.class).size()>0)
 
      {
 
        Actor bot=(Actor)getWorld().getObjects(EnemyTank.class).get(0);
 
        B bb = getWorld().getObjects(B.class).get(0);
 
        if(ray.isUnobstructed(this,bot))
 
        {
 
          turnTowards(bot.getX(), bot.getY());
 
          Projectile1 projectile1=new Projectile1();
 
          if(!getWorld().getObjects(B.class).isEmpty()) 
 
          getWorld().addObject(projectile1, getX(),getY());
 
          projectile1.getImage().scale(17, 7);
 
          projectile1.setRotation(getRotation());
 
          /**
 
           * it doesn't work. it should turn toward the blue bot and shoot it unless 
 
           * and untill thier is no obstacle infront of it
 
           * it only works properly when blue bot is not in world
 
           */
 
        }else setRotation(bb.getRotation());//setRotation is not working(even if the bot is not in the world)...it should rotate as same as B class when their is no obstacle infornt of it
 
        //return;
 
      }
 
      ray.setRotation(0);
 
      ray.setLocation(0, 0);
 
    }
 
    public void Remove()
 
    {
 
      removeTimer++;
 
      if(removeTimer>380 && removeTimer<500)
 
      count++;
 
      if(count<10 && count>0)
 
      getImage().setTransparency(255);
 
      else if(count>10 && count<20)
 
      getImage().setTransparency(0);
 
      else if(count>20) count=0;
 
      
 
      if(removeTimer>500 || isTouching(MiniRed.class))
 
      getWorld().removeObject(this);
 
    }
 
    private class Ray extends Actor
 
    {
 
     public boolean isUnobstructed(Actor actorA,Actor actorB)
 
     {
 
        int ax=actorA.getX();
 
        int ay=actorA.getY();
 
        int bx=actorB.getX();
 
        int by=actorB.getY();
 
        int length=(int)Math.hypot(by-ay, bx-ax);
 
        setImage(new GreenfootImage(length,8));
 
        setLocation(ax,ay);
 
        turnTowards(bx,by);
 
        move(length/2);
 
        return getIntersectingObjects(Obstacle.class).size()==0;
 
     }
 
    }
 
}