Workshop › Pool › Step 14 of 33

Hide the aim while rolling

What we are doing

The aim line only makes sense while aiming; while the balls roll it just follows the cue ball around. We draw it only in 'aiming'.

```js
if (state === 'aiming') {
  ctx.strokeStyle = 'rgba(255, 255, 255, 0.6)'
  ctx.lineWidth = 1
  ctx.beginPath()
  ctx.moveTo(cue.x, cue.y)
  ctx.lineTo(cue.x + Math.cos(aim) * 400, cue.y + Math.sin(aim) * 400)
  ctx.stroke()
}
```

What it means

• The six lines move inside if (state === 'aiming') { ... }, two more spaces in.

Your turn

Put if (state === 'aiming') { above the six aim-line lines in draw, indent them, and close with }.

Skills: Game states, Drawing on a canvas

← Aiming and rolling Count the shots →

All steps

1. The room
2. The table
3. The cue ball
4. Draw the balls
5. The rack
6. Numbers on the balls
7. An aim line
8. Turn the aim
9. A shot is a velocity
10. Roll
11. Friction
12. Cushions
13. Aiming and rolling
14. Hide the aim while rolling
15. Count the shots
16. Balls that touch
17. Swap the push
18. Six pockets
19. In the pocket
20. Scratch
21. Balls left
22. Clear the table
23. Choose the power
24. A power bar
25. A slingshot
26. Press to aim
27. Pull back and let go
28. Smaller steps
29. Predict the hit
30. Draw the ghost ball
31. Where the hit ball goes
32. Your best
33. Build it yourself: two players