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mysprite.rkt
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mysprite.rkt
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#lang racket
(provide mysprite%)
(define mysprite%
(class object%
(init velocity direction x y width height) ; initialization argument
; field
(define current-velocity (* 1.0 velocity))
(define current-direction direction)
(define position-x x)
(define position-y y)
(define offset-x 0)
(define offset-y 0)
(define mywidth width)
(define myheight height)
; superclass initialization
(super-new)
(define/public (get-velocity)
current-velocity)
(define/public (set-velocity amt)
(set! current-velocity amt))
(define/public (get-direction)
current-direction)
(define/public (set-direction amt)
(set! current-direction amt))
(define/public (get-position)
(list position-x position-y))
(define/public (move-purely x y)
(begin
(set! position-x (+ x position-x))
(set! position-y (+ y position-y))))
(define/public (get-offset)
(list offset-x offset-y))
(define/public (set-offset x y)
(begin
(set! offset-x x)
(set! offset-y y)))
;移动一定的距离，默认移动offset的距离，但是因为碰撞或者越界，移动的距离由x'y决定
(define/public (move [x 'null] [y 'null])
(begin
(if (or (symbol? x) (symbol? y))
(move-purely offset-x offset-y)
(move-purely x y))
(set-offset 0 0)
))
;这里算出默认偏移量，由速度和方向决定
(define/public (set-offset-default interval)
(let ([offset (/ (* interval current-velocity) 1000)])
(case current-direction
[(0) ;up
(begin
(set! offset-x 0)
(set! offset-y (- 0 offset)))]
[(1) ;left
(begin
(set! offset-x (- 0 offset))
(set! offset-y 0))]
[(2) ;right
(begin
(set! offset-x offset)
(set! offset-y 0))]
[(3) ;down
(begin
(set! offset-x 0)
(set! offset-y offset))]
[else
(begin
(set! offset-x 0)
(set! offset-y 0))])))
(define/public (get-missile-position width height)
(case current-direction
[(0) ;up
(list (+ position-x (- (/ mywidth 2) (/ height 2))) (- position-y width))]
[(1) ;left
(list (- position-x width) (+ position-y (- (/ myheight 2) (/ height 2))))]
[(2) ;right
(list (+ position-x mywidth) (+ position-y (- (/ myheight 2) (/ height 2))))]
[(3) ;down
(list (+ position-x (- (/ mywidth 2) (/ height 2))) (+ position-y myheight))]))
(define (detect-outside-iner x-min y-min x-max y-max)
(cond
[(> (+ position-x offset-x) x-max)
(begin
(set! offset-x (- x-max position-x))
#true)]
[(< (+ position-x offset-x) x-min)
(begin
(set! offset-x (- x-min position-x))
#true)]
[(> (+ position-y offset-y ) y-max)
(begin
(set! offset-y (- y-max position-y))
#true)]
[(< (+ position-y offset-y) y-min)
(begin
(set! offset-y (- y-min position-y))
#true)]
[else #false]))
(define/public (detect-outside amt-width amt-height [type 0])
(cond
[(= type 0)
(detect-outside-iner 0 0 (- amt-width mywidth) (- amt-height myheight))]
[(= type 1)
(detect-outside-iner (- 0 mywidth -1) (- 0 myheight -1) (- amt-width 1) (- amt-height 1))]))
(define (detect-collision-barrier-iner x y vect tile-width tile-height tile-step)
(let ([ref-num (inexact->exact (+ (floor (/ x tile-width)) (* (floor (/ y tile-height)) tile-step)))])
(cond
[(> (vector-ref vect ref-num) 0) ref-num]
[else #false])))
(define/public (detect-collision-barrier vect tile-width tile-height tile-step)
(case current-direction
[(0) ;up
(let ([ref-num1 (detect-collision-barrier-iner (+ position-x offset-x) (+ position-y offset-y) vect tile-width tile-height tile-step)]
[ref-num2 (detect-collision-barrier-iner (+ position-x offset-x mywidth -1) (+ position-y offset-y) vect tile-width tile-height tile-step)])
(cond
[(or ref-num2 ref-num1)
(begin
(set! offset-y (- offset-y (- (remainder (inexact->exact(floor(+ offset-y position-y))) tile-height) tile-height)))
(list (+ position-x offset-x (/ mywidth 2)) (+ position-y offset-y) ref-num1 ref-num2))]
[else #false]))]
[(1) ;left
(let ([ref-num1 (detect-collision-barrier-iner (+ position-x offset-x) (+ position-y offset-y) vect tile-width tile-height tile-step)]
[ref-num2 (detect-collision-barrier-iner (+ position-x offset-x) (+ position-y offset-y myheight -1) vect tile-width tile-height tile-step)])
(cond
[(or ref-num2 ref-num1)
(begin
(set! offset-x (- offset-x (- (remainder (inexact->exact(floor(+ offset-x position-x))) tile-width) tile-width)))
(list (+ position-x offset-x) (+ position-y offset-y (/ myheight 2)) ref-num1 ref-num2))]
[else #false]))]
[(2) ;right
(let ([ref-num1 (detect-collision-barrier-iner (+ position-x offset-x mywidth -1) (+ position-y offset-y) vect tile-width tile-height tile-step)]
[ref-num2 (detect-collision-barrier-iner (+ position-x offset-x mywidth -1) (+ position-y offset-y myheight -1) vect tile-width tile-height tile-step)])
(cond
[(or ref-num2 ref-num1)
(begin
(set! offset-x (- offset-x (remainder (inexact->exact(ceiling(+ offset-x position-x mywidth))) tile-width)))
(list (+ position-x offset-x mywidth) (+ position-y offset-y (/ myheight 2)) ref-num1 ref-num2))]
[else #false]))]
[(3) ;down
(let ([ref-num1 (detect-collision-barrier-iner (+ position-x offset-x) (+ position-y offset-y myheight -1) vect tile-width tile-height tile-step)]
[ref-num2 (detect-collision-barrier-iner (+ position-x offset-x mywidth -1) (+ position-y offset-y myheight -1) vect tile-width tile-height tile-step)])
(cond
[(or ref-num2 ref-num1)
(begin
(set! offset-y (- offset-y (remainder (inexact->exact(ceiling(+ offset-y position-y myheight))) tile-height)))
(list (+ position-x offset-x (/ mywidth 2)) (+ position-y offset-y myheight) ref-num1 ref-num2))]
[else #false]))]))
;;;;;;;
(define rect-intersection
(lambda (up1 left1 right1 down1 up2 left2 right2 down2)
(cond
[(or (< down1 up2) (< down2 up1) (< right2 left1) (< right1 left2))
#false]
[else #true])))
(define rect-intersection-center
(lambda (up1 left1 right1 down1 up2 left2 right2 down2)
(list (/ (+ (cond
[(> left1 left2) left1]
[else left2])
(cond
[(> right1 right2) right2]
[else right1])) 2)
(/ (+ (cond
[(> up1 up2) up1]
[else up2])
(cond
[(> down1 down2) down2]
[else down1])) 2))))
(define rect-center
(lambda (up left right down)
(list (/ (+ left right) 2)
(/ (+ up down) 2))))
(define/public collision-objct
(lambda (b)
(let ([right (+ position-x mywidth)]
[down (+ position-y myheight)])
(send b collision-rect position-y position-x right down))))
(define/public collision-rect
(lambda (up1 left1 right1 down1)
(let ([right (+ position-x mywidth)]
[down (+ position-y myheight)])
(cond
[(rect-intersection up1 left1 right1 down1 position-y position-x right down)
;(rect-intersection-center up1 left1 right1 down1 position-y position-x right down)
(rect-center up1 left1 right1 down1)]
[else #false]))))
))