Workshop › Zelda-style Dungeon › Step 17 of 22

The locked door

What we are doing

Walking into a locked door D with a key opens it for good: the key is used up, the door becomes floor, and the world remembers it.

```js
// A locked door right in front of you opens with a key.
const [dx, dy] = player.dir
const fc = Math.floor((cx + dx * T * 0.6) / T)
const fr = Math.floor((cy + dy * T * 0.6) / T)
if (tiles[fr] && tiles[fr][fc] === 'D' && keysHeld > 0) {
  keysHeld -= 1
  tiles[fr][fc] = '.'
  taken.add(room.rx + ',' + room.ry + ',' + fc + ',' + fr)
}
```

What it means

• The tile in front is found from the hero's middle, a bit more than half a tile in the facing direction.
• tiles[fr] && guards against a row outside the room (after a gap).
• The door's name goes into taken too, so it stays open.

Your turn

In update, after picking things up, open a door in front of you.

Skills: Game states

← A world that remembers A timer →

All steps

1. A room
2. The hero
3. The game loop
4. Walk
5. Walls
6. A touch pad
7. Next room
8. The sword
9. Enemies
10. Strike!
11. They chase you
12. They wander
13. Ouch
14. Blinking and hearts
15. Keys and hearts
16. A world that remembers
17. The locked door
18. A timer
19. Game over
20. The stairs out
21. Best time
22. Build it yourself: cleared rooms