Workshop › Connect Four › Step 20 of 38

Watch it fall

What we are doing

Now we draw the falling disc, over the board, so you can watch it drop into its hole. While a disc falls, the waiting disc above the board is hidden.

```js
if (!falling) disc(hoverCol * CELL + CELL / 2, TOP - CELL / 2, COLORS[turn])

// The falling disc goes over the board, on its way to its hole.
if (falling) disc(falling.col * CELL + CELL / 2, falling.y, COLORS[falling.who])
```

What it means

• !falling means "nothing is falling": only then the waiting disc is drawn.
• The falling disc is drawn after the board, in the middle of its column, at its current y, in its player's color.

Your turn

1. In draw, put if (!falling) in front of the waiting disc line.
2. After the two loops, leave an empty line and write the comment and the falling disc line.

Skills: Drawing on a canvas

← Gravity Inside the board? →

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