Workshop › Hangman › Step 33 of 36

Center the last row

What we are doing

The last row has only 8 keys. Each row now works out its own left edge from how many keys it has, so every row is centered.

```js
// The on-screen keyboard: rows of 9 keys, centered.
function keyRect(i) {
  const row = Math.floor(i / 9)
  const inRow = row === 2 ? 8 : 9
  const left = (canvas.width - inRow * (KEY_W + 4) + 4) / 2
  return { x: left + (i % 9) * (KEY_W + 4), y: KEYS_Y + row * (KEY_H + 6) }
}
```

What it means

• inRow is how many keys this row has: 8 in the third row, 9 otherwise.
• The keys and the gaps between them take inRow * 52 - 4 pixels. What is left of the 480, halved, is the left edge.
• For 9 keys that is 8, as before; for 8 keys it is 34.

Your turn

In keyRect, write the comment above it, add the inRow and left lines under row, and change 8 + to left +.

Skills: Drawing on a canvas

← Draw the keys Keys that remember →

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