Workshop › Klondike Solitaire › Step 2 of 40

Draw one card

What we are doing

A card is a small object: { rank, suit, up }. drawCardAt draws one at a given place: white if it is face up, blue if it is face down, with a thin dark border. We try it on one test card.

```js
const CW = 56 // card width
const CH = 78

function drawCardAt(card, x, y) {
  ctx.fillStyle = card.up ? '#ffffff' : '#1d4ed8'
  ctx.fillRect(x, y, CW, CH)
  ctx.strokeStyle = '#0f172a'
  ctx.lineWidth = 1
  ctx.strokeRect(x, y, CW, CH)
}

  drawCardAt({ rank: 12, suit: 1, up: true }, 16, 40)
```

What it means

• CW and CH are the card's width and height, named once.
• card.up ? '#ffffff' : '#1d4ed8' is the conditional operator: white if card.up is true, blue otherwise.
• strokeRect draws only the outline of a rectangle, in strokeStyle, lineWidth pixels thick.
• The call in draw draws a face-up test card (a queen of hearts) at (16, 40). It is temporary.

Your turn

1. Under const ctx = ... leave an empty line and write CW and CH.
2. Above function draw() { write drawCardAt, with an empty line between them.
3. Inside draw, after the fillRect line, leave an empty line and write the test call. Press Run.

Skills: Drawing on a canvas, Functions

← The green table The face of a card →

All steps

1. The green table
2. Draw one card
3. The face of a card
4. Red and black
5. A deck of 52
6. Shuffle
7. Piles in one object
8. Deal the seven columns
9. A place for every pile
10. Put the piles on the table
11. Fan out the columns
12. Outlines for empty places
13. Turn over a card
14. Space turns a card
15. Go through the stock again
16. What is under the pointer?
17. Hitting a card in a column
18. Tap the stock
19. Rule 1: building a column
20. Rule 2: building a foundation
21. Move cards by the rules
22. Turn over the uncovered card
23. Find where a card goes
24. Pick up a card
25. Tap to move
26. A move counter
27. Count the moves
28. Where did you grab it?
29. Follow the pointer
30. Draw the held cards at the pointer
31. Drop it where you want
32. Drop a king into an empty column
33. A clock
34. Winning
35. You won!
36. A new game
37. The best time
38. Snapshots of the table
39. Undo
40. Build it yourself: finish by itself