Movement angles

public Bubble(int radius, double xVel, double yVel)
    {
        mapBubbles();
        this.radius = radius;
        xSpeed = xVel;
        ySpeed = yVel;
    }    
    
    protected void addedToWorld(World w)
    {
        xLoc = getX();
        yLoc = getY();
    }    
    
    
    /**
     * removes all bubbles that are touching "this" ball that match
     * the specified color. Also removes "this" ball.
     * 
     * Although you may modify this if you wish to, doing so
     * is HIGHLY inadvisable. 
     * 
     * @param targetColor the color to look for when removing bubbles
     **/
     
    
    
    public void removeAdjacent(Color targetColor)
    {
        // make sure we haven't aready been removed ...
        if (getWorld()==null)
            return;
            
        // get ALL bubbles we are actually touching
        List<Bubble> touching = getObjectsInRange(2*Bubble.RADIUS,Bubble.class);
        
        // remove this bubble ...
        getWorld().removeObject(this);
        
        // look at each bubble we were touching ...
        for(Bubble b: touching)
        {
            // if the current bubble matches our color ...
            if (b.col.equals(targetColor))
                // ... repeat this process on the matching colored bubble
                b.removeAdjacent(targetColor);
        }
    }
    
    
    /**
     * Act - do whatever the Bubble wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    
    
    public void act() 
    {
       String key = Greenfoot.getKey();
        if(key!=null && key.equals("space"))
        {
            getWorld().addObject(new Bubble(0,0,0), 200, 650);
            xLoc += xSpeed;
            yLoc += ySpeed;
            
            World w = getWorld();
             if (xLoc < 0) xLoc = w.getWidth()-1;
        else if (xLoc> w.getWidth()-1) xLoc=0;
        else if (yLoc> w.getHeight()-1) yLoc=0;
        
         List<Bubble> touchingBlobs = getIntersectingObjects(Bubble.class);
        
        for (Bubble otherBlob : touchingBlobs)
        {
            radius = Math.sqrt(radius*radius + otherBlob.radius*otherBlob.radius );
            mapBubbles();
            
            xLoc = (xLoc + otherBlob.xLoc)/2;
            yLoc = (yLoc + otherBlob.yLoc)/2;
            
        }
        setLocation((int) xLoc,(int)yLoc); 
        }    
        
   
        
         
    }
}