2023 Review 3
You may consult the Racket Help Desk,
the book Picturing Programs, and the
class web site. You may use the
posn-util without comment.
No other reference materials are allowed. (No old assignments, stack overflow, ChatGPT, etc.)
-
A playing card has an image and a value. The value is a number 1 through 13.
(define-struct card (value image))The values 2 through 10 print normally. Other values print differently: 1=A, 11=J, 12=Q, 13=K. This corresponds to standard playing cards Ace, Jack, Queen, and King.
Write the function
render-card, which takes in acardstruct and puts out a 70x100 image of the card with the value in the upper left in a 20 point black font.As an example
(render-card (make-card 1 pic:hacker))produces
-
A-sample: number(percent) (Listof Number) -> (Listof Number)A-sample takes in a integer percentage, and each number in the list has that percent chance of ending up in the output.
Example:
(A-sample 80 nums)produces a list where each item in nums has an 80% chance of ending up in the output.No check-expects necessary. Show the output of three identical runs when your code loads.
-
semi-double: (Listof Number) (Listof Number) -> (Listof Number)Double all of the numbers in the first list that appear in the second list.
(check-expect (semi-double (list 1 2 3 4 5) (list 2 5 1)) (list 2 4 3 4 10))
II. Animation (45 min)
You are going to write a “screen distance measurer”. It is going to keep track of the total distance between clicks.
- Upper left corner shows cumulative total distance between clicks.
- The first click places “anchor” to start measuring distance.
- After the first click, you draw a line to where the mouse is.
- The second click adds the distance to the total and makes the line vanish (until you click again).
Make a plan before you start coding!!
The starter code creates the background shown.
A video showing the animation in action is available on YouTube and there is a Google Drive link for CPS.