Workshop › Sokoban › Step 2 of 29

The canvas and the pen

What we are doing

Games are drawn on a <canvas>, a rectangle of pixels. The page already has one with the id game. We find it and take its 2D drawing tools.

```js
const canvas = document.getElementById('game')
const ctx = canvas.getContext('2d')
```

What it means

• document.getElementById('game') finds the element whose id is game; we name it canvas.
• canvas.getContext('2d') gives the canvas's 2D drawing tools; we call them ctx.

Your turn

Write the two lines under the three comment lines at the top, above the // The classic ... comment, and leave an empty line.

Skills: Drawing on a canvas

← A level written as text The warehouse floor →

All steps

1. A level written as text
2. The canvas and the pen
3. The warehouse floor
4. A function that draws
5. A name for every tile
6. Read the walls
7. Draw the walls
8. Center the level
9. The goals
10. The boxes
11. The player
12. Two more levels
13. One step
14. Walk with the arrows
15. Boxes are in the way
16. Push a box
17. A box on a goal turns green
18. Solved!
19. On to the next level
20. Which level?
21. A line at the bottom
22. Count the moves
23. A photo of the game
24. A photo before every move
25. Undo
26. Restart
27. A record for every level
28. Show the record
29. Build it yourself: count the pushes