Workshop › OutRun-style Racer › Step 29 of 44

Other cars

What we are doing

Other cars share the road. Each is an object: its distance along the track z, its place across the road x (like playerX) and its own speed, slower than your top speed. reset places twelve of them evenly along the track. Nothing is drawn yet.

```js
let cars

  cars = []
  for (let i = 0; i < 12; i++) {
    cars.push({ z: (i + 1) * (trackLength / 12), x: Math.random() * 1.2 - 0.6, speed: 40 + Math.random() * 30 })
  }
```

What it means

• The cars are spread every twelfth of the track.
• Math.random() gives a number from 0 up to (not including) 1. * 1.2 - 0.6 turns it into -0.6 to 0.6, and 40 + ... * 30 into 40 to 70.

Your turn

1. Under let speed write let cars.
2. In reset, under speed = 0, write the four lines that build the cars.

Skills: Arrays and objects, Game states

← Curves pull you outwards Distance on a loop →

All steps

1. Sky and ground
2. Draw again and again
3. Perspective
4. One piece of road
5. A road made of segments
6. Where we are on the track
7. The road ahead
8. Stripes
9. Paint from far to near
10. Kerbs and a center line
11. Striped grass
12. Moving is one number
13. Which keys are down?
14. The gas pedal
15. Brake, coast and a top speed
16. Your car
17. Speedometer
18. A pedal for phones
19. Move the camera sideways
20. Steering
21. No turning on the spot
22. The grass is slow
23. Steering by touch
24. A track with curves
25. Bend the road
26. No jumps in the curve
27. Which segment am I on?
28. Curves pull you outwards
29. Other cars
30. Distance on a loop
31. Cars that shrink with distance
32. Traffic moves
33. Rear-end crash
34. Counting laps
35. Show the lap
36. A lap timer
37. Show the time
38. Best lap
39. Show the best lap
40. Racing or finished
41. The finish line
42. Finished!
43. Race again
44. Build it yourself: beat the clock