Workshop › Pinball › Step 7 of 42

Move by the velocity

What we are doing

Every frame the ball moves by its velocity: vx pixels sideways, vy pixels down. That is update, called by the loop before draw.

```js
function update() {
  ball.x += ball.vx
  ball.y += ball.vy
}

function loop() {
  update()
  draw()
  requestAnimationFrame(loop)
}
```

What it means

• ball.x += ball.vx adds the sideways speed to the position; ball.y += ball.vy the downward speed.
• The loop now updates first, then draws the new state.

Your turn

1. Write update above function draw() {, with an empty line between them.
2. In loop, call update() above draw().

Skills: Velocity and gravity, The game loop

← Draw the ball Launch with Space →

All steps

1. Paint the table
2. Draw one wall
3. A list of walls
4. The game loop
5. A ball in the lane
6. Draw the ball
7. Move by the velocity
8. Launch with Space
9. Gravity
10. Does the ball touch a wall?
11. Push the ball out
12. Bounce off the wall
13. Small steps and a speed limit
14. Ready or playing
15. The next ball
16. Three bumpers
17. The ball meets a bumper
18. A bumper kicks
19. A score and a fresh start
20. Points for every hit
21. Remember which bumper was hit
22. Light it up
23. Lit for a moment, points once
24. Two flippers
25. Where is the tip?
26. Flippers stop the ball
27. Which keys are held?
28. Which way to turn
29. Flip!
30. A moving wall
31. The flipper throws
32. Three balls
33. Balls left and game over
34. Play again
35. Remember the best score
36. Launch on letting go
37. Pull the spring
38. Show the spring
39. Two thumbs
40. Pull with a finger
41. Tap to play again
42. Build it yourself: slingshots