davesmylie

; See http://htdp2e.blogspot.com/2012/05/exercise-172-develop-data.html

; Constants
(define WORM-SIZE 10)
(define WORM-MOVE (* WORM-SIZE 2))
(define WIDTH 800) ; width of the game
(define HEIGHT 500) ; height of the game
(define SEGMENT (circle WORM-SIZE "solid" "red")) 
 
; these structs will hold the current list of worm segments, the direction 

davesmylie

; Constants

(define WORM-SIZE 10)
(define WORM-MOVE WORM-SIZE)
(define WIDTH 800)  ; width of the game

; these structs will hold the current position of the worm, the direction 
; the worm is travelling in, and our world object
(define-struct worm(x-pos y-pos))
(define-struct direction(x y))

davesmylie

;Exercise 170: Design an interactive GUI program that continually moves a one-segment worm and enables a player to
;control the movement of the worm with the four cardinal arrow keys. Your program should use a red disk to render the
;one-and-only segment of the worm. For each clock tick, the worm should move diameter.


; Game constants and constants

; We make the worm size changable here, and when we move the worm it will be by the amount 
; specified 
; The hints provided in the question suggest two different means to keep track of the worm - a physical and logical