Workshop › Rhythm Lanes › Step 2 of 35

The first lane

What we are doing

There are 4 lanes, 70 pixels wide, centred on the canvas. We name these numbers and draw the first lane as a tall strip.

```js
const LANES = 4
const LANE_W = 70
const LEFT = (canvas.width - LANES * LANE_W) / 2

ctx.fillStyle = '#1e293b'
ctx.fillRect(LEFT + 2, 0, LANE_W - 4, canvas.height)
```

What it means

• LANES is the number of lanes, LANE_W their width, LEFT the empty space on the left: (400 - 280) / 2 = 60.
• The lane is drawn 2 pixels in from each side (+ 2, - 4), so neighbouring lanes have a thin gap.

Your turn

1. Under const ctx = ... leave an empty line and write the three constants.
2. At the very end, under the background lines, write the two lane lines. Press Run.

Skills: Drawing on a canvas

← A stage for the notes Four lanes with a loop →

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