Workshop › Mario-style Platformer › Step 15 of 37

Bump your head

What we are doing

Rising into a tile, the head went into the tile above: put the head exactly at that tile's bottom. vy = 0 then lets gravity pull the body back down.

```js
} else {
  body.y = Math.floor(body.y / TILE) * TILE + TILE
}
```

What it means

• Math.floor(y / TILE) is the row the head went into; times TILE plus TILE is that tile's bottom edge.

Your turn

In moveY, after the if (body.vy > 0) { ... } block, add the else block before body.vy = 0.

Skills: Collision detection

← Jump Short hops →

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