Workshop › Connect Four › Step 25 of 38

Circle the four

What we are doing

The winning discs get a white ring. To draw only the outline of a circle, use stroke instead of fill.

```js
for (const [row, col] of line) {
  ctx.strokeStyle = 'white'
  ctx.lineWidth = 4
  ctx.beginPath()
  ctx.arc(col * CELL + CELL / 2, TOP + row * CELL + CELL / 2, CELL / 2 - 10, 0, Math.PI * 2)
  ctx.stroke()
}
```

What it means

• for (const [row, col] of line) takes each [row, col] pair apart.
• strokeStyle is the line color, lineWidth its thickness, and stroke draws the outline of the circle (radius 22).

Your turn

In draw, under the falling disc line, leave an empty line and write the loop.

Skills: Drawing on a canvas

← We have a winner Who won? →

All steps

1. A dark background
2. A drawing function
3. The blue board
4. One hole
5. A whole row
6. All 42 holes
7. The board in memory
8. Discs in their colors
9. Draw every frame
10. Where does the disc land?
11. Play a column
12. Taking turns
13. Click to play
14. The next disc
15. Whose turn?
16. Playing with the keyboard
17. Keys 1 to 7
18. A disc on its way
19. Gravity
20. Watch it fall
21. Inside the board?
22. Walking along a line
23. Four in a row?
24. We have a winner
25. Circle the four
26. Who won?
27. A draw
28. Play again
29. Try a move and take it back
30. Win, or block
31. Don't help the player
32. Prefer the middle
33. The computer's turn
34. Only on your turn
35. You and the computer
36. Counting wins
37. Show the score
38. Build it yourself: the loser starts