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53 lines
1.8 KiB
Racket
53 lines
1.8 KiB
Racket
#lang debug racket/base
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(require racket/contract
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"compile.rkt"
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"quad.rkt")
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(provide layout)
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(define/contract (posn-add p0 p1)
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($point? $size? . -> . $point?)
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($point (+ ($point-x p0) ($size-width p1)) (+ ($point-y p0) ($size-height p1))))
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(define/contract (size char)
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(quad? . -> . $size?)
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($size 1 1))
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(define/contract (advance char)
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(quad? . -> . $size?)
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($size 1 0))
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(define (min-x rect) ($point-x ($rect-origin rect)))
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(define (width rect) ($size-width ($rect-size rect)))
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(define (max-x rect) (+ (min-x rect) (width rect)))
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(define (min-y rect) ($point-y ($rect-origin rect)))
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(define (height rect) ($size-height ($rect-size rect)))
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(define (max-y rect) (+ (min-y rect) (height rect)))
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(define/contract (rect-contains-point? rect pt)
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($rect? $point? . -> . boolean?)
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(and (<= (min-x rect) ($point-x pt) (max-x rect))
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(<= (min-y rect) ($point-y pt) (max-y rect))))
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(define/contract (rect-contains-rect? outer inner)
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($rect? $rect? . -> . boolean?)
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(and (rect-contains-point? outer ($rect-origin inner))
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(rect-contains-point? outer ($point (max-x inner) (max-y inner)))))
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(define-pass (layout qs)
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#:pre (list-of has-no-position?)
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#:post (list-of has-position?)
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(define frame ($rect ($point 0 0) ($size (current-wrap-width) 30)))
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(define (quad-fits? q posn)
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(define q-size (size q))
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(define quad-rect ($rect posn q-size))
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(and (rect-contains-rect? frame quad-rect) posn))
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(for/fold ([posn ($point 0 0)]
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#:result qs)
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([q (in-list qs)])
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(define first-posn-on-next-line ($point 0 (add1 ($point-y posn))))
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(define winning-posn (or (ormap (λ (posn) (quad-fits? q posn)) (list posn first-posn-on-next-line)) (error 'no-posn-that-fits)))
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(set-quad-posn! q winning-posn)
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(posn-add winning-posn (advance q))))
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