Workshop › Doodle Jump-style Climber › Step 4 of 24

Bounce

What we are doing

In this game you never press jump: every landing starts the next bounce. So on the floor, instead of stopping, the player gets an upward speed of -11.

```js
const JUMP = -11 // every bounce starts with this speed (negative = up)

  // Touching the floor starts the next bounce.
  if (player.y + player.h >= FLOOR) {
    player.y = FLOOR - player.h
    player.vy = JUMP
  }
```

What it means

• JUMP is negative: up is negative on the canvas.
• Instead of vy = 0, the landing sets vy = JUMP: the player rises, slows down, falls and bounces again.

Your turn

1. Under GRAVITY, write JUMP.
2. In update, add the comment and change player.vy = 0 to player.vy = JUMP.

Skills: Velocity and gravity

← Gravity Steer left and right →

All steps

1. The jumper
2. Draw again and again
3. Gravity
4. Bounce
5. Steer left and right
6. Through the sides
7. Half here, half there
8. Touch steering
9. Platforms
10. Land on platforms
11. A camera that follows
12. Lines on the wall
13. How hard should it be?
14. Endless platforms
15. Miss and fall
16. Play again
17. Tap to play again
18. Score is height
19. Best score
20. Kinds of platform
21. Moving platforms
22. Traps
23. It breaks!
24. Build it yourself: springs