Workshop › Mario-style Platformer › Step 24 of 37

Count, and screen versus world

What we are doing

collected counts the coins. The counter is drawn after ctx.restore(), in screen coordinates, so it stays in the corner while the world scrolls.

```js
let collected

  collected = 0

      collected += 1

  ctx.fillStyle = 'white'
  ctx.font = 'bold 18px sans-serif'
  ctx.textAlign = 'left'
  ctx.fillText('Coins: ' + collected, 12, 26)
```

What it means

• collected starts at 0 in loadLevel and goes up by one for each coin taken.
• The text is written after restore, so (12, 26) is always the screen's top-left corner.

Your turn

1. Under let camera write let collected; in loadLevel, under camera = 0, write collected = 0.
2. In the coin loop, under coin.taken = true, write collected += 1.
3. At the end of draw, under ctx.restore(), leave an empty line and write the four text lines.

Skills: Game states, Drawing on a canvas

← Collect them Enemies →

All steps

1. The sky
2. A level made of text
3. Draw the tiles
4. What is solid?
5. Is a box touching anything?
6. Find the start
7. Draw the player
8. Gravity
9. Landing on tiles
10. Which keys are held?
11. Speed up
12. Friction
13. Walls
14. Jump
15. Bump your head
16. Short hops
17. A few frames of grace
18. Coyote time
19. A camera that follows
20. Stop at the ends
21. Draw only what is on screen
22. Coins
23. Collect them
24. Count, and screen versus world
25. Enemies
26. Enemies that walk
27. Do not walk off ledges
28. Lives and a fresh start
29. Falling into a pit
30. Enemies hurt
31. Stomp!
32. Squashed enemies are gone
33. Game over
34. Play again
35. The flag
36. Reach the flag
37. Build it yourself: jump buffering