GateTileExit.java

import greenfoot.*;

public class GateTileExit extends Tile {
    private boolean activated = false;

    public GateTileExit() {
        super("tile_gate0.png", 'q');
        setIsPassable(true);
    }

    public void act() {
        super.act(); 
        if (activated){
            if (isInTopHalfOfBoard()){
                if (player.getKilled() == 8){
                    deactivate();
                }
            } else{
                if (player.getKilled() == 24){
                    deactivate();
                }
            }
        }
    }

    public void activate() {
        if (activated) return;
        activated = true;
        setIsPassable(false);
        setImage(new GreenfootImage("tile_gate1.png"));
    }

    public void deactivate() {
        activated = false;
        setIsPassable(true);
        setImage(new GreenfootImage("tile_gate0.png"));
    }

    public boolean isActivated() {
        return activated;
    }
}