Workshop › Hangman › Step 31 of 36

Where each key goes

What we are doing

A phone opens no keyboard for a canvas, so the game will draw its own: 26 keys in rows of 9. First, keyRect(i) works out where key number i goes.

```js
const KEY_W = 48
const KEY_H = 34
const KEYS_Y = 360

function keyRect(i) {
  const row = Math.floor(i / 9)
  return { x: 8 + (i % 9) * (KEY_W + 4), y: KEYS_Y + row * (KEY_H + 6) }
}
```

What it means

• A key is 48×34 pixels; the keyboard starts at y = 360.
• Math.floor(i / 9) is the row: keys 0–8 are row 0, 9–17 row 1, 18–25 row 2.
• i % 9 is the remainder after dividing by 9: the place in the row.
• Each key is 4 pixels further than the width (a gap), each row 6 pixels further than the height.
• return { x, y } gives back an object: the key's top-left corner.

Your turn

1. Under const MAX_WRONG = 6 write the three key sizes.
2. Above canvas.addEventListener('pointerdown', ...), write keyRect and leave an empty line. Press Run.

Skills: Drawing on a canvas

← Remember the best streak Draw the keys →

All steps

1. A list of secret words
2. The canvas and the pen
3. Paint the paper
4. A function that draws
5. Pick a random word
6. Write the word
7. Hide it behind blanks
8. Remember the guesses
9. Draw again and again
10. A guess
11. Guess with the keyboard
12. Only letters count
13. Count the misses
14. The same letter twice is free
15. Six misses at most
16. Show the misses
17. List the wrong letters
18. Draw a line
19. The gallows
20. The first miss: a head
21. Body, arms and legs
22. The parts in a list
23. Losing
24. Winning
25. Show the word you missed
26. The end message
27. Play again
28. Never the same word twice
29. A winning streak
30. Remember the best streak
31. Where each key goes
32. Draw the keys
33. Center the last row
34. Keys that remember
35. Tap a key
36. Build it yourself: a hint button