1-9-4.rkt~

;; The first three lines of this file were inserted by DrRacket. They record metadata
;; about the language level of this file in a form that our tools can easily process.
#reader(lib "htdp-beginner-reader.ss" "lang")((modname 1-9-4) (read-case-sensitive #t) (teachpacks ()) (htdp-settings #(#t constructor repeating-decimal #f #t none #f () #f)))
(define HEIGHT 80) ; distances in terms of pixels 
(define WIDTH 100)
(define XSHOTS (/ WIDTH 2))
 
; graphical constants 
(define BACKGROUND (empty-scene WIDTH HEIGHT))
(define SHOT (triangle 3 "solid" "red"))