Workshop › Rhythm Lanes › Step 4 of 35

The hit line

What we are doing

Near the bottom, each lane gets a colored bar: the hit line. The four colors are kept in an array, one per lane.

```js
const HIT_Y = 480 // where a note should be when you press
const COLORS = ['#f43f5e', '#f59e0b', '#22c55e', '#3b82f6']

  ctx.fillRect(x + 2, 0, LANE_W - 4, canvas.height)
  ctx.fillStyle = COLORS[lane]
  ctx.fillRect(x + 6, HIT_Y - 4, LANE_W - 12, 8)
}
```

What it means

• HIT_Y is the height of the hit line, 480 pixels from the top.
• COLORS is an array; COLORS[lane] is the color at that position, counting from 0.
• The bar is 8 pixels tall and centred on HIT_Y (HIT_Y - 4), 6 pixels in from the lane's sides.

Your turn

1. Under the LEFT line write HIT_Y and COLORS.
2. Inside the loop, under the lane's fillRect, write the two bar lines.

Skills: Arrays and objects

← Four lanes with a loop A function that draws →

All steps

1. A stage for the notes
2. The first lane
3. Four lanes with a loop
4. The hit line
5. A function that draws
6. The song as text
7. From text to notes
8. The clock decides where
9. Draw the notes
10. A clock that ticks
11. The game loop
12. Lanes that light up
13. Keys for the lanes
14. Show the keys
15. Hit the closest note
16. Close enough in time
17. One press, one hit
18. A message on the screen
19. Say Hit
20. Let the message go
21. Perfect or good
22. Keep count
23. Missed notes
24. Score
25. Hits in a row
26. The multiplier
27. The song ends
28. Stop the clock
29. Accuracy
30. The grade
31. The results
32. Play again
33. Best score
34. Lanes you can tap
35. Build it yourself: a speed setting