function markRoom(room) {
	new Line(room.x * 5, room.y * 5, room.x * 5, room.y * 5 + room.ysize, 0x6c, true);
	new Line(room.x * 5, room.y * 5, room.x * 5 + room.xsize, room.y * 5, 0x6c, true);
	new Line(room.x * 5 + room.xsize, room.y * 5, room.x * 5 + room.xsize, room.y * 5 + room.ysize, 0x6c, true);
	new Line(room.x * 5, room.y * 5 + room.ysize, room.x * 5 + room.xsize, room.y * 5 + room.ysize, 0x6c, true);
}