1 12687dd9 2023-08-04 jrmu ;; The first three lines of this file were inserted by DrScheme. They record metadata
 2 12687dd9 2023-08-04 jrmu ;; about the language level of this file in a form that our tools can easily process.
 3 12687dd9 2023-08-04 jrmu #reader(lib "htdp-intermediate-reader.ss" "lang")((modname 18.1.8) (read-case-sensitive #t) (teachpacks ((lib "draw.ss" "teachpack" "htdp"))) (htdp-settings #(#t constructor repeating-decimal #f #t none #f ((lib "draw.ss" "teachpack" "htdp")))))
 4 12687dd9 2023-08-04 jrmu (define MRPOLY (cons (make-posn 50 50) (cons (make-posn 50 80) (cons (make-posn 100 80) (cons (make-posn 140 230) (cons (make-posn 180 330) (cons (make-posn 240 220) (cons (make-posn 130 220) empty))))))))
 5 12687dd9 2023-08-04 jrmu 
 6 12687dd9 2023-08-04 jrmu (define (draw-polygon a-poly)
 7 12687dd9 2023-08-04 jrmu   (cond
 8 12687dd9 2023-08-04 jrmu     [(empty? (rest a-poly)) true]
 9 12687dd9 2023-08-04 jrmu     [else (connect-dots (cons (last a-poly) a-poly))]))
10 12687dd9 2023-08-04 jrmu 
11 12687dd9 2023-08-04 jrmu (define (connect-dots a-poly)
12 12687dd9 2023-08-04 jrmu   (cond
13 12687dd9 2023-08-04 jrmu     [(empty? (rest a-poly)) true]
14 12687dd9 2023-08-04 jrmu     [else (and
15 12687dd9 2023-08-04 jrmu            (draw-solid-line (first a-poly)
16 12687dd9 2023-08-04 jrmu                             (second a-poly)
17 12687dd9 2023-08-04 jrmu                             'black)
18 12687dd9 2023-08-04 jrmu            (connect-dots (rest a-poly)))]))
19 12687dd9 2023-08-04 jrmu 
20 12687dd9 2023-08-04 jrmu (define (last a-poly)
21 12687dd9 2023-08-04 jrmu   (cond
22 12687dd9 2023-08-04 jrmu     [(empty? (rest a-poly)) (first a-poly)]
23 12687dd9 2023-08-04 jrmu     [else (last (rest a-poly))]))
24 12687dd9 2023-08-04 jrmu (define (add-at-end a-poly first-posn)
25 12687dd9 2023-08-04 jrmu   (cond
26 12687dd9 2023-08-04 jrmu     [(empty? (rest a-poly)) (first a-poly)]
27 12687dd9 2023-08-04 jrmu     [else (cons (add-at-end a-poly first-posn) (cons first-posn empty))]))
28 12687dd9 2023-08-04 jrmu (define (modified-draw-polygon a-poly)
29 12687dd9 2023-08-04 jrmu   (cond
30 12687dd9 2023-08-04 jrmu     [(empty? (rest a-poly)) true]
31 12687dd9 2023-08-04 jrmu     [else (connect-dots (add-at-end a-poly))]))