Workshop › Pac-Man-style Maze Chase › Step 28 of 42

Cyan works with red

What we are doing

Cyan takes the point 2 tiles ahead of you and doubles the arrow from red to that point. When red is behind you, cyan's target lands in front of you: together they close in from both sides.

```js
  if (g.name === 'cyan') {
    // Double the arrow from the red ghost to two tiles ahead of the player: it cuts the player off from the other side.
    const red = ghosts[0]
    return { col: 2 * (player.col + player.dir[0] * 2) - red.col, row: 2 * (player.row + player.dir[1] * 2) - red.row }
  }
```

What it means

• With A two tiles ahead of the player and R the red ghost, the arrow from R to A is A - R; doubling it from R gives R + 2 × (A - R), which is 2 × A - R.

Your turn

In target, under the orange block, write the cyan block.

Skills: Game states

← Orange is shy Wait for the first key →

All steps

1. The maze as text
2. The game loop
3. Draw the walls
4. A set of pellets
5. Draw the pellets
6. The player
7. Where can you walk?
8. What a mover remembers
9. One frame of movement
10. Move every frame
11. Turns you can press early
12. Glide between tiles
13. Turn back at once
14. Swipes on a phone
15. Eat the pellets
16. Show the score
17. Clear the maze
18. A red ghost
19. A ghost never turns back
20. The ghost walks
21. The ghost hunts you
22. Four ghosts in the house
23. One by one out of the house
24. Scatter or chase?
25. Every ghost to its corner
26. Pink cuts you off
27. Orange is shy
28. Cyan works with red
29. Wait for the first key
30. Tell the player to start
31. Three lives
32. Caught!
33. Game over
34. Play again
35. Frighten the ghosts
36. Power pellets work
37. Scared ghosts wander slowly
38. Eat a scared ghost
39. Blue, then flashing
40. Harder levels
41. A best score that lasts
42. Build it yourself: the slow tunnel