{
    private GreenfootImage image;
    private int transparency = 180;
    private int x = 30;
    private int y = 30;

    public Pheromones()
    {
        updateImage();
    }
    
    private void updateImage()
    {
        GreenfootImage img = new GreenfootImage(30,30);
        for (int h=0 ; h<transparency ; h++)
        {
            img.setColor(Color.WHITE);
            img.fillOval(0,0,x,y); 
            img.setTransparency(transparency);                 
        }         
        setImage(img);
    }      
    
    public void pheromoneDisipate() 
    {
        transparency = transparency - 5;        
        if (transparency <=0 ){
            getWorld().removeObject(this);
        }
        else {
            updateImage();
        }
    }
}