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@rule
def zombie_ai(game, td):
    for zombie in game.zombies:
        target = None
        distance = 10.0 # sight range of a zombie basically
        # cheap
        for player in game.players:
            to_player = zombie.pos-player.pos
            player_distance = to_player.mag()
            if player_distance >= distance:
                continue
            line = (zombie.pos, player.pos)
            if not game.map.line_geometry.has_intersection(line):
                target = player.pos
        if not target:
            if zombie.target:
                target = zombie.target
            else:
                target = Vector2(random()*game.map.width, random()*game.map.height)
        zombie.rotation = (zombie-target).angle()
        zombie.target = target