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Summary CPSC 110 Racket Solution PSET 5 University of British Columbia
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University of British Columbia Summary CPSC 110 Racket Solution PSET 5
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1 ;; DO NOT PUT ANYTHING PERSONALLY IDENTIFYING BEYOND YOUR CWL IN THIS FILE.2 ;; YOUR CWLs WILL BE SUFFICIENT TO IDENTIFY YOU AND, IF YOU HAVE ONE, YOUR
3 ;; PARTNER.
4 (require 2htdp/universe)
5 (require 2htdp/image)
6 (require spd/tags)
7
8 (@assignment pset-05);Do not edit or remove this tag
9 (@cwl sumi1008) ;Replace ??? with your cwl,
10 ;; ;second ??? is replaced with partner cwl if you have one
11
12 ;; Bounce any number of balls around the screen.
13
14
15 ;;
16 ;; In this problem set you are given our official solution to problem
17 ;; set 4 (with a few additional things added) as a starting point.
18 ;; We have given you some more constants, a helper function called
19 ;; touch-paddle? which you may use, and a new data defintion called Game.
20 ;; You need to revise the program so that:
21 ;; - the game includes a paddle that moves back and forth across the
22 ;; bottom of the screen
23 ;; - the paddle is controlled by the left and right arrow keys
24 ;; - when a ball hits the paddle it disappears
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25 ;; - as before the mouse can be used to add balls to the game
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26 ;;
27 ;; As stated above, we have given you a new data definition called Game.
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28 ;; You MUST revise the program so that it uses Game as the world state.
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29 ;; You MUST NOT change the Game data definition in anyway (though you are
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30 ;; allowed to add more Game constants).
31 ;;
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32 ;; We suggest you work in three distinct phases, making sure your program
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33 ;; works correctly at the end of each phase before going on to the next.
34 ;; - change the program's world state to Game
35 ;; - provide left/right arrow key control over the paddle
36 ;; - make it so that when a ball hits the paddle it disappears
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37 ;;
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38 ;; In each of these phases you should follow the design recipes! Re-work
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39 ;; the domain analysis for changing and constant information, update the
40 ;; data definitions, revise the main function, and so on. Make sure that
41 ;; your tags are correct and that all your tests work correctly before you
42 ;; proceed to the next phase.
43 ;;
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44 ;; NOTE: Your on-tick function MUST be designed as a composition of two other
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45 ;; functions called game-with-next-balls and game-with-caught-balls.
46 ;;
47 ;; Note that we are giving you significant help in the starter file.
48 ;; You absolutely MUST USE OUR STARTER AS THE BASIS FOR YOUR WORK.
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49 ;;
50 ;; We recommend that you begin by printing this file and planning out what
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51 ;; needs to change, what needs to be added, and what will be unchanged.
52 ;;
53 (@problem 1)
54 (@htdw ListOfBall)
55
sh
56 ;; Constants:
57 (define WIDTH 605)
58 (define HEIGHT 535)
59
60 (define PADDLE-WIDTH 60)
61 (define PADDLE-THICKNESS 10)
62 (define PADDLE (rectangle PADDLE-WIDTH PADDLE-THICKNESS "solid" "white"))
63 (define PADDLE-CTR-Y (- HEIGHT 40))
64 (define PADDLE-MOVE-PER-KEY 10)
65
66This(define BALL-RADIUS
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67
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, 68 (define TOP BALL-RADIUS)
69 (define BOT (- HEIGHT BALL-RADIUS 1))
70 (define LEF BALL-RADIUS)
71 (define RIG (- WIDTH BALL-RADIUS 1))
72
73 (define BALL (circle BALL-RADIUS "solid" "white"))
74
75 (define MTS (rectangle WIDTH HEIGHT "solid" "green"))
76
77
78 ;; ===========================================================================
79 ;; ===========================================================================
80 ;; Data definitions:
81
82 (@htdd Ball)
83 (define-struct ball (x y dx dy))
84 ;; Ball is (make-ball Number Number Number Number)
85 ;; interp. (make-ball x y dx dy) is ball
86 ;; - position x, y in screen coordinates
87 ;; - velocity dx, dy in pixels/tick
88 ;; CONSTRAINT: x is in [LEF, RIG]; y is in [TOP, BOT]
89 (define B1 (make-ball (/ WIDTH 2) (/ HEIGHT 2) 4 -3))
90
91 (@dd-template-rules compound)
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92
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93 (define (fn-for-ball b)
94 (... (ball-x b)
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95 (ball-y b)
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96 (ball-dx b)
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97 (ball-dy b)))
98
99 (@htdd ListOfBall) rs e
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100 ;; ListOfBall is one of:
101 ;; - empty
102 ;; - (cons Ball ListOfBall)
103 ;; interp. a list of balls
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104 (define LOB1 empty)
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105 (define LOB2 (cons B1 empty))
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106
107 (@dd-template-rules one-of
108 atomic-distinct
109 compound
110 ref
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111 self-ref)
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112
113 (define (fn-for-lob lob)
114 (cond [(empty? lob) (...)]
115 [else
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116 (... (fn-for-ball (first lob))
117 (fn-for-lob (rest lob)))]))
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118
119
120 (@htdd Game)
121 (define-struct game (balls paddle))
122 ;; Game is (make-game ListOfBall Number)
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123 ;; interp. the current state of a game, with all the balls in play,
124 ;; as well as the x-position of the paddle in screen coordinates
125 (define G0 (make-game empty (/ WIDTH 2)))
126 (define G1 (make-game (cons B1 empty) (/ WIDTH 2)))
127
128 (@dd-template-rules compound ref)
129
130 (define (fn-for-game g)
131 (... (fn-for-lob (game-balls g))
132 (game-paddle g)))
133This study source was downloaded by 100000805705997 from CourseHero.com on 10-14-2021 20:26:46 GMT -05:00
134
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