/**
     * Act - do whatever the Survivor wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        moveonKeyPress();
    }    
    
    public void moveRight()
    {
        int x = (getX() + 4);
        int y = (getY());
        
        setLocation(x, y);
    }
    
    public void moveLeft()
    {
        int x = (getX()- 4);
        int y = (getY());
        
        setLocation(x, y);
    }
    
    public void moveDown()
    {
        int x = (getX());
        int y = (getY() + 4);
        
        setLocation(x, y);
    }
    
    public void moveUp()
    {
        int x = (getX());
        int y = (getY() -4);
        
        setLocation(x, y);
    }
    
    public void moveonKeyPress()
    {
      if(Greenfoot.isKeyDown("left"))
     {
      moveLeft();
     }
     if(Greenfoot.isKeyDown("right"))
     {
        moveRight();
     }
     if(Greenfoot.isKeyDown("up"))
     {
        moveUp();
     }
     if(Greenfoot.isKeyDown("down"))
     {
       moveDown();
     }
        
   

    }

public void act()
{
    int dx=0, dy=0;
    if(Greenfoot.isKeyDown("left")) dx--;
    if(Greenfoot.isKeyDown("right")) dx++;
    if(Greenfoot.isKeyDown("up")) dy--;
    if(Greenfoot.isKeyDown("down")) dy++;
    if (dx!=0 || dy!=0) setLocation(getX()+dx*4, getY()+dy*4);
}