1054 lines
48 KiB
Scheme
1054 lines
48 KiB
Scheme
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;; modified version of graph.ss from mrlib as distributed with PLT Scheme v352
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(module graph mzscheme
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(require (lib "class.ss")
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(lib "list.ss")
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(lib "math.ss")
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(lib "mred.ss" "mred")
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(lib "contract.ss"))
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(provide graph-snip<%>
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graph-snip-mixin
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graph-pasteboard<%>
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graph-pasteboard-mixin)
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(define graph-snip<%>
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(interface ()
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get-children
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add-child
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remove-child
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get-parents
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add-parent
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remove-parent
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has-self-loop?
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find-shortest-path))
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(define-local-member-name get-parent-links)
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(provide/contract (add-links
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(case->
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((is-a?/c graph-snip<%>)
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(is-a?/c graph-snip<%>)
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. -> .
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void?)
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((is-a?/c graph-snip<%>)
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(is-a?/c graph-snip<%>)
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(or/c false/c (is-a?/c pen%))
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(or/c false/c (is-a?/c pen%))
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(or/c false/c (is-a?/c brush%))
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(or/c false/c (is-a?/c brush%))
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. -> .
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void?)
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((is-a?/c graph-snip<%>)
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(is-a?/c graph-snip<%>)
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(or/c false/c (is-a?/c pen%))
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(or/c false/c (is-a?/c pen%))
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(or/c false/c (is-a?/c brush%))
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(or/c false/c (is-a?/c brush%))
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(or/c false/c string?)
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. -> .
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void?)
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((is-a?/c graph-snip<%>)
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(is-a?/c graph-snip<%>)
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(or/c false/c (is-a?/c pen%))
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(or/c false/c (is-a?/c pen%))
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(or/c false/c (is-a?/c brush%))
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(or/c false/c (is-a?/c brush%))
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number?
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number?
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. -> .
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void?)
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((is-a?/c graph-snip<%>)
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(is-a?/c graph-snip<%>)
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(or/c false/c (is-a?/c pen%))
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(or/c false/c (is-a?/c pen%))
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(or/c false/c (is-a?/c brush%))
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(or/c false/c (is-a?/c brush%))
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number?
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number?
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(or/c false/c string?)
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. -> .
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void?)))
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(add-links/text-colors
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((is-a?/c graph-snip<%>)
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(is-a?/c graph-snip<%>)
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(or/c false/c (is-a?/c pen%))
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(or/c false/c (is-a?/c pen%))
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(or/c false/c (is-a?/c brush%))
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(or/c false/c (is-a?/c brush%))
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(or/c false/c (is-a?/c color%))
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(or/c false/c (is-a?/c color%))
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number?
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number?
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(or/c false/c string?)
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. -> .
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void?)))
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;; interface to #<struct:link> stuff
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(provide (struct link (snip dark-pen light-pen dark-brush light-brush dark-text light-text dx dy label)))
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(define self-offset 10)
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;; (or-2v arg ...)
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;; like `or', except each `arg' returns two values. The
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;; truth value of each arg is #t if both args are #t and
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;; #f otherwise
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(define-syntax (or-2v stx)
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(syntax-case stx ()
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[(_ arg)
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(syntax arg)]
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[(_ arg args ...)
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(syntax
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(let-values ([(one two) arg])
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(if (and one two)
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(values one two)
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(or-2v args ...))))]))
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(define snipclass (make-object snip-class%))
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(define default-dark-pen (send the-pen-list find-or-create-pen "blue" 1 'solid))
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(define default-light-pen (send the-pen-list find-or-create-pen "light blue" 1 'solid))
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(define default-dark-brush (send the-brush-list find-or-create-brush "light blue" 'solid))
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(define default-light-brush (send the-brush-list find-or-create-brush "white" 'solid))
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(define default-dark-text (send the-color-database find-color "blue"))
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(define default-light-text (send the-color-database find-color "light blue"))
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;; label is boolean or string
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(define-struct link (snip dark-pen light-pen dark-brush light-brush dark-text light-text dx dy label))
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;; methods for #<struct:link> access
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; (define (get-link-dark-pen link) (link-dark-pen link))
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; (define (get-link-light-pen link) (link-light-pen link))
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; (define (get-link-dark-brush link) (link-dark-brush link))
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; (define (get-link-light-brush link) (link-light-brushn link))
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;
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;; add-links : (is-a?/c graph-snip<%>) (is-a?/c graph-snip<%>) -> void
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;; : (is-a?/c graph-snip<%>) (is-a?/c graph-snip<%>) pen pen brush brush -> void
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(define add-links
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(case-lambda
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[(parent child) (add-links parent child #f #f #f #f)]
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[(parent child dark-pen light-pen dark-brush light-brush)
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(add-links parent child dark-pen light-pen dark-brush light-brush 0 0)]
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[(parent child dark-pen light-pen dark-brush light-brush label)
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(add-links parent child dark-pen light-pen dark-brush light-brush 0 0 label)]
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[(parent child dark-pen light-pen dark-brush light-brush dx dy)
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(add-links parent child dark-pen light-pen dark-brush light-brush dx dy #f)]
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[(parent child dark-pen light-pen dark-brush light-brush dx dy label)
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(add-links/text-colors parent child
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dark-pen light-pen dark-brush light-brush
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#f #f
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dx dy
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label)]))
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(define (add-links/text-colors parent child
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dark-pen light-pen dark-brush light-brush
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dark-text light-text
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dx dy
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label)
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(send parent add-child child)
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(send child add-parent parent dark-pen light-pen dark-brush light-brush dark-text light-text dx dy label))
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(define graph-snip-mixin
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(mixin ((class->interface snip%)) (graph-snip<%>)
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(field (children null))
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(define/public (get-children) children)
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(define/public (add-child child)
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(unless (memq child children)
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(set! children (cons child children))))
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(define/public (remove-child child)
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(when (memq child children)
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(set! children (remq child children))))
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(field (parent-links null))
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(define/public (get-parent-links) parent-links)
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(define/public (get-parents) (map link-snip parent-links))
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(define/public add-parent
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(case-lambda
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[(parent) (add-parent parent #f #f #f #f)]
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[(parent dark-pen light-pen dark-brush light-brush)
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(add-parent parent dark-pen light-pen dark-brush light-brush 0 0)]
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[(parent dark-pen light-pen dark-brush light-brush dx dy)
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(add-parent parent dark-pen light-pen dark-brush light-brush dx dy #f)]
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[(parent dark-pen light-pen dark-brush light-brush dx dy)
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(add-parent parent dark-pen light-pen dark-brush light-brush #f #f dx dy #f)]
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[(parent dark-pen light-pen dark-brush light-brush dark-text light-text dx dy label)
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(unless (memf (lambda (parent-link) (eq? (link-snip parent-link) parent)) parent-links)
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(set! parent-links
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(cons (make-link parent
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(or dark-pen default-dark-pen)
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(or light-pen default-light-pen)
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(or dark-brush default-dark-brush)
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(or light-brush default-light-brush)
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(or dark-text default-dark-text)
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(or light-text default-light-text)
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dx
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dy
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label)
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parent-links)))]))
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(define/public (remove-parent parent)
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(when (memf (lambda (parent-link) (eq? (link-snip parent-link) parent)) parent-links)
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(set! parent-links
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(remove
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parent
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parent-links
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(lambda (parent parent-link) (eq? (link-snip parent-link) parent))))))
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(define/public (has-self-loop?)
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(memq this (get-children)))
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(define/public (find-shortest-path other)
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(define visited-ht (make-hash-table))
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(define (first-view? n)
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(hash-table-get visited-ht n (lambda ()
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(hash-table-put! visited-ht n #f)
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#t)))
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(let loop ((horizon (list (list this))))
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(cond
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[(null? horizon) #f]
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[(assq other horizon) => (lambda (winner) winner)]
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[else
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(let inner-loop ((paths horizon)
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(acc '()))
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(cond
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[(null? paths) (loop (apply append acc))]
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[else
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(let ((path (car paths)))
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(inner-loop
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(cdr paths)
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(cons
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(map (lambda (child) (cons child path)) (filter first-view? (send (car path) get-children)))
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acc)))]))])))
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(super-new)
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(inherit set-snipclass)
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(set-snipclass snipclass)))
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(define graph-pasteboard<%>
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(interface ()
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on-mouse-over-snips
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set-arrowhead-params
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get-arrowhead-params))
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(define-struct rect (left top right bottom))
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(define graph-pasteboard-mixin
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(mixin ((class->interface pasteboard%)) (graph-pasteboard<%>)
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(inherit find-first-snip find-next-selected-snip)
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(define arrowhead-angle-width (* 1/4 pi))
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(define arrowhead-short-side 8)
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(define arrowhead-long-side 12)
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(define/public (set-arrowhead-params angle-width long-side short-side)
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(set! arrowhead-angle-width angle-width)
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(set! arrowhead-short-side short-side)
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(set! arrowhead-long-side long-side))
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(define/public (get-arrowhead-params)
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(values arrowhead-angle-width
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arrowhead-long-side
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arrowhead-short-side))
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(inherit dc-location-to-editor-location get-canvas get-dc)
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(field (currently-overs null))
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(define/override (on-event evt)
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(cond
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[(send evt leaving?)
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(change-currently-overs null (get-dc))
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(super on-event evt)]
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[(or (send evt entering?)
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(send evt moving?))
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(let ([ex (send evt get-x)]
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[ey (send evt get-y)])
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(let-values ([(x y) (dc-location-to-editor-location ex ey)])
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(change-currently-overs (find-snips-under-mouse x y) (get-dc))))
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(super on-event evt)]
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[else
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(super on-event evt)]))
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(define/augment (on-interactive-move evt)
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(invalidate-selected-snips)
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#;(super on-interactive-move evt)
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)
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(define/augment (after-interactive-move evt)
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(invalidate-selected-snips)
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#;(super on-interactive-move evt))
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(define/override (interactive-adjust-move snip x y)
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(let ([dc (get-dc)])
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(when dc
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(invalidate-to-children/parents snip dc)))
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(super interactive-adjust-move snip x y))
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(define/augment (after-insert snip before x y)
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(let ([dc (get-dc)])
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(when dc
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(invalidate-to-children/parents snip dc)))
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#;(super after-insert snip before x y))
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;; invalidate-selected-snips : -> void
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;; invalidates the region around the selected
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;; snips and their parents and children
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(define/private (invalidate-selected-snips)
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(let ([dc (get-dc)])
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(when dc
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(let loop ([snip (find-next-selected-snip #f)])
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(when snip
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(invalidate-to-children/parents snip dc)
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(loop (find-next-selected-snip snip)))))))
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(define/private (add-to-rect from to rect)
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(let-values ([(xf yf wf hf) (get-position from)]
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[(xt yt wt ht) (get-position to)])
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(make-rect
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(if rect
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(min xf xt (rect-left rect))
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(min xf xt))
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(if rect
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(min yf yt (rect-top rect))
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(min yf yt))
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(if rect
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(max (+ xf wf) (+ xt wt) (rect-right rect))
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(max (+ xf wf) (+ xt wt)))
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(if rect
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(max (+ yf hf) (+ yt ht) (rect-bottom rect))
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(max (+ yf hf) (+ yt ht))))))
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;; find-snips-under-mouse : num num -> (listof graph-snip<%>)
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||
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(define/private (find-snips-under-mouse x y)
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(let loop ([snip (find-first-snip)])
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(cond
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[snip
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(let-values ([(sx sy sw sh) (get-position snip)])
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(if (and (<= sx x (+ sx sw))
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(<= sy y (+ sy sh))
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(is-a? snip graph-snip<%>))
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||
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(cons snip (loop (send snip next)))
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(loop (send snip next))))]
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[else null])))
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;; change-currently-overs : (listof snip) -> void
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(define/private (change-currently-overs new-currently-overs dc)
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||
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(unless (set-equal new-currently-overs currently-overs)
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||
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(let ([old-currently-overs currently-overs])
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||
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(set! currently-overs new-currently-overs)
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||
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(on-mouse-over-snips currently-overs)
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||
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(for-each
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(lambda (old-currently-over)
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||
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(invalidate-to-children/parents old-currently-over dc))
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||
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old-currently-overs)
|
||
|
|
(for-each
|
||
|
|
(lambda (new-currently-over)
|
||
|
|
(invalidate-to-children/parents new-currently-over dc))
|
||
|
|
new-currently-overs))))
|
||
|
|
|
||
|
|
(define/public (on-mouse-over-snips snips)
|
||
|
|
(void))
|
||
|
|
|
||
|
|
;; set-equal : (listof snip) (listof snip) -> boolean
|
||
|
|
;; typically lists will be small (length 1),
|
||
|
|
;; so use andmap/memq rather than hash-tables
|
||
|
|
(define/private (set-equal los1 los2)
|
||
|
|
(and (andmap (lambda (s1) (memq s1 los2)) los1)
|
||
|
|
(andmap (lambda (s2) (memq s2 los1)) los2)
|
||
|
|
#t))
|
||
|
|
|
||
|
|
;; invalidate-to-children/parents : snip dc -> void
|
||
|
|
;; invalidates the region containing this snip and
|
||
|
|
;; all of its children and parents.
|
||
|
|
(inherit invalidate-bitmap-cache)
|
||
|
|
(define/private (invalidate-to-children/parents snip dc)
|
||
|
|
(when (is-a? snip graph-snip<%>)
|
||
|
|
(let* ([parents-and-children (append (get-all-parents snip)
|
||
|
|
(get-all-children snip))]
|
||
|
|
[rects (eliminate-redundancies (get-rectangles snip parents-and-children))]
|
||
|
|
[or/c (or/c-rects rects)]
|
||
|
|
[text-height (call-with-values
|
||
|
|
(λ () (send dc get-text-extent "Label" #f #f 0))
|
||
|
|
(λ (w h a s) h))]
|
||
|
|
[invalidate-rect
|
||
|
|
(lambda (rect)
|
||
|
|
(invalidate-bitmap-cache (- (rect-left rect) text-height)
|
||
|
|
(- (rect-top rect) text-height)
|
||
|
|
(+ (- (rect-right rect)
|
||
|
|
(rect-left rect))
|
||
|
|
text-height)
|
||
|
|
(+ (- (rect-bottom rect)
|
||
|
|
(rect-top rect))
|
||
|
|
text-height)))])
|
||
|
|
(cond
|
||
|
|
[(< (rect-area or/c)
|
||
|
|
(apply + (map (lambda (x) (rect-area x)) rects)))
|
||
|
|
(invalidate-rect or/c)]
|
||
|
|
[else
|
||
|
|
(for-each invalidate-rect rects)]))))
|
||
|
|
|
||
|
|
;; (listof rect) -> (listof rect)
|
||
|
|
(define/private (eliminate-redundancies rects)
|
||
|
|
(let loop ([rects rects]
|
||
|
|
[acc null])
|
||
|
|
(cond
|
||
|
|
[(null? rects) acc]
|
||
|
|
[else (let ([r (car rects)])
|
||
|
|
(cond
|
||
|
|
[(or (ormap (lambda (other-rect) (rect-included-in? r other-rect))
|
||
|
|
(cdr rects))
|
||
|
|
(ormap (lambda (other-rect) (rect-included-in? r other-rect))
|
||
|
|
acc))
|
||
|
|
(loop (cdr rects)
|
||
|
|
acc)]
|
||
|
|
[else
|
||
|
|
(loop (cdr rects)
|
||
|
|
(cons r acc))]))])))
|
||
|
|
|
||
|
|
;; rect-included-in? : rect rect -> boolean
|
||
|
|
(define/private (rect-included-in? r1 r2)
|
||
|
|
(and ((rect-left r1) . >= . (rect-left r2))
|
||
|
|
((rect-top r1) . >= . (rect-top r2))
|
||
|
|
((rect-right r1) . <= . (rect-right r2))
|
||
|
|
((rect-bottom r1) . <= . (rect-bottom r2))))
|
||
|
|
|
||
|
|
;; get-rectangles : snip (listof snip) -> rect
|
||
|
|
;; computes the rectangles that need to be invalidated for connecting
|
||
|
|
(define/private (get-rectangles main-snip c/p-snips)
|
||
|
|
(let ([main-snip-rect (snip->rect main-snip)])
|
||
|
|
(let loop ([c/p-snips c/p-snips])
|
||
|
|
(cond
|
||
|
|
[(null? c/p-snips) null]
|
||
|
|
[else
|
||
|
|
(let* ([c/p (car c/p-snips)]
|
||
|
|
[rect
|
||
|
|
(if (eq? c/p main-snip)
|
||
|
|
(let-values ([(sx sy sw sh) (get-position c/p)]
|
||
|
|
[(_1 h _2 _3) (send (get-dc) get-text-extent "yX")])
|
||
|
|
(make-rect (- sx self-offset)
|
||
|
|
sy
|
||
|
|
(+ (+ sx sw) self-offset)
|
||
|
|
(+ (+ sy sh) self-offset h)))
|
||
|
|
(or/c-rects (list main-snip-rect
|
||
|
|
(snip->rect c/p))))])
|
||
|
|
(cons rect (loop (cdr c/p-snips))))]))))
|
||
|
|
|
||
|
|
(define/private (snip->rect snip)
|
||
|
|
(let-values ([(sx sy sw sh) (get-position snip)])
|
||
|
|
(let* ([dc (get-dc)]
|
||
|
|
[h (if dc
|
||
|
|
(let-values ([(_1 h _2 _3) (send dc get-text-extent "yX")])
|
||
|
|
h)
|
||
|
|
10)])
|
||
|
|
(make-rect sx
|
||
|
|
sy
|
||
|
|
(+ sx sw)
|
||
|
|
(max (+ sy sh)
|
||
|
|
(+ sy (/ sh 2) (* 2
|
||
|
|
(sin (/ arrowhead-angle-width 2))
|
||
|
|
arrowhead-long-side) h))))))
|
||
|
|
|
||
|
|
(define/private (rect-area rect)
|
||
|
|
(* (- (rect-right rect)
|
||
|
|
(rect-left rect))
|
||
|
|
(- (rect-bottom rect)
|
||
|
|
(rect-top rect))))
|
||
|
|
|
||
|
|
(define/private (or/c-rects rects)
|
||
|
|
(cond
|
||
|
|
[(null? rects) (make-rect 0 0 0 0)]
|
||
|
|
[else
|
||
|
|
(let loop ([rects (cdr rects)]
|
||
|
|
[l (rect-left (car rects))]
|
||
|
|
[t (rect-top (car rects))]
|
||
|
|
[r (rect-right (car rects))]
|
||
|
|
[b (rect-bottom (car rects))])
|
||
|
|
(cond
|
||
|
|
[(null? rects) (make-rect l t r b)]
|
||
|
|
[else
|
||
|
|
(let ([rect (car rects)])
|
||
|
|
(loop (cdr rects)
|
||
|
|
(min l (rect-left rect))
|
||
|
|
(min t (rect-top rect))
|
||
|
|
(max r (rect-right rect))
|
||
|
|
(max b (rect-bottom rect))))]))]))
|
||
|
|
|
||
|
|
;; on-paint : ... -> void
|
||
|
|
;; see docs, same as super
|
||
|
|
;; draws all of the lines and then draws all of the arrow heads
|
||
|
|
(define/private (old-on-paint before? dc left top right bottom dx dy draw-caret)
|
||
|
|
(let ()
|
||
|
|
;; draw-connection : link snip boolean boolean -> void
|
||
|
|
;; sets the drawing context (pen and brush)
|
||
|
|
;; determines if the connection is between a snip and itself or two different snips
|
||
|
|
;; and calls draw-self-connection or draw-non-self-connection
|
||
|
|
(define (draw-connection from-link to dark-lines?)
|
||
|
|
(let ([from (link-snip from-link)])
|
||
|
|
(when (send from get-admin)
|
||
|
|
(let ([dx (+ dx (link-dx from-link))]
|
||
|
|
[dy (+ dy (link-dy from-link))])
|
||
|
|
(cond
|
||
|
|
[(eq? from to)
|
||
|
|
(set-pen/brush from-link dark-lines?)
|
||
|
|
(draw-self-connection dx dy (link-snip from-link))]
|
||
|
|
[else
|
||
|
|
(draw-non-self-connection dx dy from-link dark-lines? to)])))))
|
||
|
|
|
||
|
|
(define (draw-self-connection dx dy snip)
|
||
|
|
(let*-values ([(sx sy sw sh) (get-position snip)]
|
||
|
|
[(s1x s1y) (values (+ sx sw) (+ sy (* sh 1/2)))]
|
||
|
|
[(s2x s2y) (values (+ sx sw self-offset) (+ sy (* 3/4 sh) (* 1/2 self-offset)))]
|
||
|
|
[(s3x s3y) (values (+ sx sw) (+ sy sh self-offset))]
|
||
|
|
[(b12x b12y) (values s2x s1y)]
|
||
|
|
[(b23x b23y) (values s2x s3y)]
|
||
|
|
|
||
|
|
[(s4x s4y) (values (- sx arrowhead-short-side)
|
||
|
|
(+ sy (* sh 1/2)))]
|
||
|
|
[(s5x s5y) (values (- sx arrowhead-short-side self-offset)
|
||
|
|
(+ sy (* 3/4 sh) (* 1/2 self-offset)))]
|
||
|
|
[(s6x s6y) (values (- sx arrowhead-short-side)
|
||
|
|
(+ sy sh self-offset))]
|
||
|
|
[(b45x b45y) (values s5x s4y)]
|
||
|
|
[(b56x b56y) (values s5x s6y)])
|
||
|
|
|
||
|
|
(update-polygon s4x s4y sx s4y)
|
||
|
|
(send dc draw-spline (+ dx s1x) (+ dy s1y) (+ dx b12x) (+ dy b12y) (+ dx s2x) (+ dy s2y))
|
||
|
|
(send dc draw-spline (+ dx s2x) (+ dy s2y) (+ dx b23x) (+ dy b23y) (+ dx s3x) (+ dy s3y))
|
||
|
|
(send dc draw-line (+ dx s3x) (+ dy s3y) (+ dx s6x) (+ dy s6y))
|
||
|
|
(send dc draw-spline (+ dx s4x) (+ dy s4y) (+ dx b45x) (+ dy b45y) (+ dx s5x) (+ dy s5y))
|
||
|
|
(send dc draw-spline (+ dx s5x) (+ dy s5y) (+ dx b56x) (+ dy b56y) (+ dx s6x) (+ dy s6y))
|
||
|
|
(send dc draw-polygon points dx dy)))
|
||
|
|
|
||
|
|
(define (draw-non-self-connection dx dy from-link dark-lines? to)
|
||
|
|
(let ([from (link-snip from-link)])
|
||
|
|
(let*-values ([(xf yf wf hf) (get-position from)]
|
||
|
|
[(xt yt wt ht) (get-position to)]
|
||
|
|
[(lf tf rf bf) (values xf yf (+ xf wf) (+ yf hf))]
|
||
|
|
[(lt tt rt bt) (values xt yt (+ xt wt) (+ yt ht))])
|
||
|
|
(let ([x1 (+ xf (/ wf 2))]
|
||
|
|
[y1 (+ yf (/ hf 2))]
|
||
|
|
[x2 (+ xt (/ wt 2))]
|
||
|
|
[y2 (+ yt (/ ht 2))])
|
||
|
|
|
||
|
|
(unless (or (and (x1 . <= . left)
|
||
|
|
(x2 . <= . left))
|
||
|
|
(and (x1 . >= . right)
|
||
|
|
(x2 . >= . right))
|
||
|
|
(and (y1 . <= . top)
|
||
|
|
(y2 . <= . top))
|
||
|
|
(and (y1 . >= . bottom)
|
||
|
|
(y2 . >= . bottom)))
|
||
|
|
(set-pen/brush from-link dark-lines?)
|
||
|
|
(let-values ([(from-x from-y)
|
||
|
|
(or-2v (find-intersection x1 y1 x2 y2
|
||
|
|
lf tf rf tf)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
lf bf rf bf)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
lf tf lf bf)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
rf tf rf bf))]
|
||
|
|
[(to-x to-y)
|
||
|
|
(or-2v (find-intersection x1 y1 x2 y2
|
||
|
|
lt tt rt tt)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
lt bt rt bt)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
lt tt lt bt)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
rt tt rt bt))])
|
||
|
|
(when (and from-x from-y to-x to-y)
|
||
|
|
(let ()
|
||
|
|
(define (arrow-point-ok? point-x point-y)
|
||
|
|
(and (in-rectangle? point-x point-y
|
||
|
|
(min lt rt lf rf) (min tt bt tf bf)
|
||
|
|
(max lt rt lf rf) (max tt bt tf bf))
|
||
|
|
(not (strict-in-rectangle? point-x point-y
|
||
|
|
(min lt rt) (min tt bt)
|
||
|
|
(max lt rt) (max tt bt)))
|
||
|
|
(not (strict-in-rectangle? point-x point-y
|
||
|
|
(min lf rf) (min tf bf)
|
||
|
|
(max lf rf) (max tf bf)))))
|
||
|
|
(cond
|
||
|
|
[(or (in-rectangle? from-x from-y lt tt rt bt)
|
||
|
|
(in-rectangle? to-x to-y lf tf rf bf))
|
||
|
|
;; the snips overlap, draw nothing
|
||
|
|
(void)]
|
||
|
|
[else
|
||
|
|
(send dc draw-line
|
||
|
|
(+ dx from-x) (+ dy from-y)
|
||
|
|
(+ dx to-x) (+ dy to-y))
|
||
|
|
(update-polygon from-x from-y to-x to-y)
|
||
|
|
(when (and (arrow-point-ok? (send point1 get-x) (send point1 get-y))
|
||
|
|
(arrow-point-ok? (send point2 get-x) (send point2 get-y))
|
||
|
|
(arrow-point-ok? (send point3 get-x) (send point3 get-y))
|
||
|
|
(arrow-point-ok? (send point4 get-x) (send point4 get-y)))
|
||
|
|
;; the arrowhead is not overlapping the snips, so draw it
|
||
|
|
;; (this is only an approximate test, but probably good enough)
|
||
|
|
(send dc draw-polygon points dx dy))])))))))))
|
||
|
|
|
||
|
|
(define (set-pen/brush from-link dark-lines?)
|
||
|
|
(send dc set-brush
|
||
|
|
(if dark-lines?
|
||
|
|
(link-dark-brush from-link)
|
||
|
|
(link-light-brush from-link)))
|
||
|
|
(send dc set-pen
|
||
|
|
(if dark-lines?
|
||
|
|
(link-dark-pen from-link)
|
||
|
|
(link-light-pen from-link))))
|
||
|
|
|
||
|
|
;;; body of on-paint
|
||
|
|
(when before?
|
||
|
|
(let ([old-pen (send dc get-pen)]
|
||
|
|
[old-brush (send dc get-brush)]
|
||
|
|
[os (send dc get-smoothing)])
|
||
|
|
(send dc set-smoothing 'aligned)
|
||
|
|
|
||
|
|
(let loop ([snip (find-first-snip)])
|
||
|
|
(when snip
|
||
|
|
(when (and (send snip get-admin)
|
||
|
|
(is-a? snip graph-snip<%>))
|
||
|
|
(for-each (lambda (parent-link)
|
||
|
|
(draw-connection parent-link snip #f))
|
||
|
|
(send snip get-parent-links)))
|
||
|
|
(loop (send snip next))))
|
||
|
|
|
||
|
|
(for-each
|
||
|
|
(lambda (currently-over)
|
||
|
|
(for-each
|
||
|
|
(lambda (child)
|
||
|
|
(let ([parent-link-f
|
||
|
|
(memf (lambda (parent-link) (eq? currently-over (link-snip parent-link)))
|
||
|
|
(send child get-parent-links))])
|
||
|
|
(when parent-link-f
|
||
|
|
(draw-connection (car parent-link-f) child #t))))
|
||
|
|
(send currently-over get-children))
|
||
|
|
(for-each
|
||
|
|
(lambda (parent-link)
|
||
|
|
(draw-connection parent-link currently-over #t))
|
||
|
|
(send currently-over get-parent-links)))
|
||
|
|
currently-overs)
|
||
|
|
|
||
|
|
(send dc set-smoothing os)
|
||
|
|
(send dc set-pen old-pen)
|
||
|
|
(send dc set-brush old-brush)))
|
||
|
|
|
||
|
|
(super on-paint before? dc left top right bottom dx dy draw-caret)))
|
||
|
|
|
||
|
|
(define/override (on-paint before? dc left top right bottom dx dy draw-caret)
|
||
|
|
(let ()
|
||
|
|
;; draw-connection : link snip boolean boolean -> void
|
||
|
|
;; sets the drawing context (pen and brush)
|
||
|
|
;; determines if the connection is between a snip and itself or two different snips
|
||
|
|
;; and calls draw-self-connection or draw-non-self-connection
|
||
|
|
|
||
|
|
(define splines? #f) ;; [en,dis]able spline drawing betwen nodes
|
||
|
|
|
||
|
|
(define (draw-connection from-link to dark-lines?)
|
||
|
|
(let ([from (link-snip from-link)])
|
||
|
|
(when (send from get-admin)
|
||
|
|
(let ([dx (+ dx (link-dx from-link))]
|
||
|
|
[dy (+ dy (link-dy from-link))])
|
||
|
|
(cond
|
||
|
|
[(eq? from to)
|
||
|
|
(set-pen/brush from-link dark-lines?)
|
||
|
|
(draw-self-connection dx dy (link-snip from-link) from-link dark-lines?)]
|
||
|
|
[else
|
||
|
|
(draw-non-self-connection dx dy from-link dark-lines? to)])))))
|
||
|
|
|
||
|
|
(define (get-text-length txt)
|
||
|
|
(let-values ([(text-len h d v) (send dc get-text-extent txt)])
|
||
|
|
text-len))
|
||
|
|
|
||
|
|
(define (draw-self-connection dx dy snip the-link dark-lines?)
|
||
|
|
(let*-values ([(sx sy sw sh) (get-position snip)]
|
||
|
|
[(s1x s1y) (values (+ sx sw) (+ sy (* sh 1/2)))]
|
||
|
|
[(s2x s2y) (values (+ sx sw self-offset) (+ sy (* 3/4 sh) (* 1/2 self-offset)))]
|
||
|
|
[(s3x s3y) (values (+ sx sw) (+ sy sh self-offset))]
|
||
|
|
[(b12x b12y) (values s2x s1y)]
|
||
|
|
[(b23x b23y) (values s2x s3y)]
|
||
|
|
|
||
|
|
[(s4x s4y) (values (- sx arrowhead-short-side)
|
||
|
|
(+ sy (* sh 1/2)))]
|
||
|
|
[(s5x s5y) (values (- sx arrowhead-short-side self-offset)
|
||
|
|
(+ sy (* 3/4 sh) (* 1/2 self-offset)))]
|
||
|
|
[(s6x s6y) (values (- sx arrowhead-short-side)
|
||
|
|
(+ sy sh self-offset))]
|
||
|
|
[(b45x b45y) (values s5x s4y)]
|
||
|
|
[(b56x b56y) (values s5x s6y)])
|
||
|
|
|
||
|
|
(update-polygon s4x s4y sx s4y)
|
||
|
|
(send dc draw-spline (+ dx s1x) (+ dy s1y) (+ dx b12x) (+ dy b12y) (+ dx s2x) (+ dy s2y))
|
||
|
|
(send dc draw-spline (+ dx s2x) (+ dy s2y) (+ dx b23x) (+ dy b23y) (+ dx s3x) (+ dy s3y))
|
||
|
|
(send dc draw-line (+ dx s3x) (+ dy s3y) (+ dx s6x) (+ dy s6y))
|
||
|
|
|
||
|
|
(let* ((textlen (get-text-length (link-label the-link)))
|
||
|
|
(linelen (- s6x s3x))
|
||
|
|
(offset (* 1/2 (- linelen textlen))))
|
||
|
|
(when #t (> sw textlen)
|
||
|
|
(send dc draw-text
|
||
|
|
(link-label the-link)
|
||
|
|
(+ dx s3x offset)
|
||
|
|
(+ dy s3y)
|
||
|
|
#f
|
||
|
|
0
|
||
|
|
0)))
|
||
|
|
|
||
|
|
(send dc draw-spline (+ dx s4x) (+ dy s4y) (+ dx b45x) (+ dy b45y) (+ dx s5x) (+ dy s5y))
|
||
|
|
(send dc draw-spline (+ dx s5x) (+ dy s5y) (+ dx b56x) (+ dy b56y) (+ dx s6x) (+ dy s6y))
|
||
|
|
(send dc draw-polygon points dx dy)))
|
||
|
|
|
||
|
|
(define (draw-non-self-connection dx dy from-link dark-lines? to)
|
||
|
|
(let ([from (link-snip from-link)])
|
||
|
|
(let*-values ([(xf yf wf hf) (get-position from)]
|
||
|
|
[(xt yt wt ht) (get-position to)]
|
||
|
|
[(lf tf rf bf) (values xf yf (+ xf wf) (+ yf hf))]
|
||
|
|
[(lt tt rt bt) (values xt yt (+ xt wt) (+ yt ht))])
|
||
|
|
(let ([x1 (+ xf (/ wf 2))]
|
||
|
|
[y1 (+ yf (/ hf 2))]
|
||
|
|
[x2 (+ xt (/ wt 2))]
|
||
|
|
[y2 (+ yt (/ ht 2))])
|
||
|
|
|
||
|
|
(set-pen/brush from-link dark-lines?)
|
||
|
|
(let-values ([(from-x from-y)
|
||
|
|
(or-2v (find-intersection x1 y1 x2 y2
|
||
|
|
lf tf rf tf)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
lf bf rf bf)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
lf tf lf bf)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
rf tf rf bf))]
|
||
|
|
[(to-x to-y)
|
||
|
|
(or-2v (find-intersection x1 y1 x2 y2
|
||
|
|
lt tt rt tt)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
lt bt rt bt)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
lt tt lt bt)
|
||
|
|
(find-intersection x1 y1 x2 y2
|
||
|
|
rt tt rt bt))])
|
||
|
|
(when (and from-x from-y to-x to-y)
|
||
|
|
(let ((from-pt (make-rectangular from-x from-y))
|
||
|
|
(to-pt (make-rectangular to-x to-y)))
|
||
|
|
(define (arrow-point-ok? point-x point-y)
|
||
|
|
(and (in-rectangle? point-x point-y
|
||
|
|
(min lt rt lf rf) (min tt bt tf bf)
|
||
|
|
(max lt rt lf rf) (max tt bt tf bf))
|
||
|
|
(not (strict-in-rectangle? point-x point-y
|
||
|
|
(min lt rt) (min tt bt)
|
||
|
|
(max lt rt) (max tt bt)))
|
||
|
|
(not (strict-in-rectangle? point-x point-y
|
||
|
|
(min lf rf) (min tf bf)
|
||
|
|
(max lf rf) (max tf bf)))))
|
||
|
|
(cond
|
||
|
|
[(or (in-rectangle? from-x from-y lt tt rt bt)
|
||
|
|
(in-rectangle? to-x to-y lf tf rf bf))
|
||
|
|
;; the snips overlap, draw nothing
|
||
|
|
(void)]
|
||
|
|
[else
|
||
|
|
|
||
|
|
(if splines?
|
||
|
|
(send dc draw-spline ;; modified link drawing
|
||
|
|
(+ dx from-x) (+ dy from-y)
|
||
|
|
(+ dx from-x) (+ dy to-y)
|
||
|
|
(+ dx to-x) (+ dy to-y))
|
||
|
|
(send dc draw-line
|
||
|
|
(+ dx from-x) (+ dy from-y)
|
||
|
|
(+ dx to-x) (+ dy to-y)))
|
||
|
|
|
||
|
|
(update-polygon from-x from-y to-x to-y)
|
||
|
|
(when (and (arrow-point-ok? (send point1 get-x) (send point1 get-y))
|
||
|
|
(arrow-point-ok? (send point2 get-x) (send point2 get-y))
|
||
|
|
(arrow-point-ok? (send point3 get-x) (send point3 get-y))
|
||
|
|
(arrow-point-ok? (send point4 get-x) (send point4 get-y)))
|
||
|
|
;; the arrowhead is not overlapping the snips, so draw it
|
||
|
|
;; (this is only an approximate test, but probably good enough)
|
||
|
|
(send dc draw-polygon points dx dy))
|
||
|
|
(when (named-link? from-link)
|
||
|
|
(let*-values ([(text-len h d v) (send dc get-text-extent (link-label from-link))]
|
||
|
|
[(x) (/ (+ from-x to-x) 2)]
|
||
|
|
[(y) (/ (+ from-y to-y) 2)]
|
||
|
|
[(theta) (- (angle (- to-pt from-pt)))]
|
||
|
|
[(flip?) #f #;(negative? (- to-x from-x))]
|
||
|
|
[(text-angle)
|
||
|
|
(if flip?
|
||
|
|
(+ theta pi)
|
||
|
|
theta)]
|
||
|
|
[(x)
|
||
|
|
(- x (* h (cos (if flip? (+ (- theta) pi) (- theta)))))]
|
||
|
|
[(y)
|
||
|
|
(- y (* h (sin (if flip? (+ (- theta) pi) (- theta)))))]
|
||
|
|
[(sqr) (λ (x) (* x x))])
|
||
|
|
(when (> (sqrt (+ (sqr (- to-x from-x)) (sqr (- to-y from-y)))) text-len)
|
||
|
|
(send dc draw-text (link-label from-link)
|
||
|
|
(+ dx x)
|
||
|
|
(+ dy y)
|
||
|
|
#f
|
||
|
|
0
|
||
|
|
text-angle))
|
||
|
|
))]))))))))
|
||
|
|
(define (named-link? l) (link-label l))
|
||
|
|
|
||
|
|
(define (set-pen/brush from-link dark-lines?)
|
||
|
|
(send dc set-brush
|
||
|
|
(if dark-lines?
|
||
|
|
(link-dark-brush from-link)
|
||
|
|
(link-light-brush from-link)))
|
||
|
|
(send dc set-pen
|
||
|
|
(if dark-lines?
|
||
|
|
(link-dark-pen from-link)
|
||
|
|
(link-light-pen from-link)))
|
||
|
|
(send dc set-text-foreground
|
||
|
|
(if dark-lines?
|
||
|
|
(link-dark-text from-link)
|
||
|
|
(link-light-text from-link))))
|
||
|
|
|
||
|
|
;;; body of on-paint
|
||
|
|
(when before?
|
||
|
|
(let ([old-pen (send dc get-pen)]
|
||
|
|
[old-brush (send dc get-brush)]
|
||
|
|
[old-fg (send dc get-text-foreground)]
|
||
|
|
[os (send dc get-smoothing)])
|
||
|
|
(send dc set-smoothing 'aligned)
|
||
|
|
|
||
|
|
(let ([pairs '()])
|
||
|
|
(for-each-to-redraw
|
||
|
|
left top right bottom
|
||
|
|
(lambda (from-link to)
|
||
|
|
(let ([from (link-snip from-link)])
|
||
|
|
(cond
|
||
|
|
[(or (memq from currently-overs)
|
||
|
|
(memq to currently-overs))
|
||
|
|
(set! pairs (cons (cons from-link to) pairs))]
|
||
|
|
[else
|
||
|
|
(draw-connection from-link to #f)]))))
|
||
|
|
(for-each (lambda (pr)
|
||
|
|
(draw-connection (car pr) (cdr pr) #t))
|
||
|
|
pairs))
|
||
|
|
|
||
|
|
(send dc set-smoothing os)
|
||
|
|
(send dc set-pen old-pen)
|
||
|
|
(send dc set-text-foreground old-fg)
|
||
|
|
(send dc set-brush old-brush)))
|
||
|
|
|
||
|
|
(super on-paint before? dc left top right bottom dx dy draw-caret)))
|
||
|
|
|
||
|
|
;; for-each-to-redraw : number number number number (link snip -> void)
|
||
|
|
(define/private (for-each-to-redraw left top right bottom f)
|
||
|
|
(let ()
|
||
|
|
;; draw-connection : link snip boolean boolean -> void
|
||
|
|
;; sets the drawing context (pen and brush)
|
||
|
|
;; determines if the connection is between a snip and itself or two different snips
|
||
|
|
;; and calls draw-self-connection or draw-non-self-connection
|
||
|
|
(define (maybe-call-f from-link to)
|
||
|
|
(let ([from (link-snip from-link)])
|
||
|
|
(when (send from get-admin)
|
||
|
|
(cond
|
||
|
|
[(eq? from to)
|
||
|
|
(f from-link to)]
|
||
|
|
[else
|
||
|
|
(let*-values ([(xf yf wf hf) (get-position from)]
|
||
|
|
[(xt yt wt ht) (get-position to)]
|
||
|
|
[(lf tf rf bf) (values xf yf (+ xf wf) (+ yf hf))]
|
||
|
|
[(lt tt rt bt) (values xt yt (+ xt wt) (+ yt ht))])
|
||
|
|
(let ([x1 (+ xf (/ wf 2))]
|
||
|
|
[y1 (+ yf (/ hf 2))]
|
||
|
|
[x2 (+ xt (/ wt 2))]
|
||
|
|
[y2 (+ yt (/ ht 2))])
|
||
|
|
|
||
|
|
(unless (or (and (x1 . <= . left)
|
||
|
|
(x2 . <= . left))
|
||
|
|
(and (x1 . >= . right)
|
||
|
|
(x2 . >= . right))
|
||
|
|
(and (y1 . <= . top)
|
||
|
|
(y2 . <= . top))
|
||
|
|
(and (y1 . >= . bottom)
|
||
|
|
(y2 . >= . bottom)))
|
||
|
|
(f from-link to))))]))))
|
||
|
|
|
||
|
|
(let loop ([snip (find-first-snip)])
|
||
|
|
(when snip
|
||
|
|
(when (and (send snip get-admin)
|
||
|
|
(is-a? snip graph-snip<%>))
|
||
|
|
(for-each (lambda (parent-link) (maybe-call-f parent-link snip))
|
||
|
|
(send snip get-parent-links)))
|
||
|
|
(loop (send snip next))))))
|
||
|
|
|
||
|
|
|
||
|
|
(field
|
||
|
|
[point1 (make-object point% 0 0)]
|
||
|
|
[point2 (make-object point% 0 0)]
|
||
|
|
[point3 (make-object point% 0 0)]
|
||
|
|
[point4 (make-object point% 0 0)]
|
||
|
|
[points (list point1 point2 point3 point4)])
|
||
|
|
|
||
|
|
;; update-polygon : number^4 -> void
|
||
|
|
;; updates points1, 2, and 3 with the arrow head's
|
||
|
|
;; points. Use a turtle-like movement to find the points.
|
||
|
|
;; point3 is the point where the line should end.
|
||
|
|
(define/private (update-polygon from-x from-y to-x to-y)
|
||
|
|
(define (move tx ty ta d) (values (+ tx (* d (cos ta)))
|
||
|
|
(+ ty (* d (sin ta)))
|
||
|
|
ta))
|
||
|
|
(define (turn tx ty ta a) (values tx
|
||
|
|
ty
|
||
|
|
(+ ta a)))
|
||
|
|
(define init-angle
|
||
|
|
(cond
|
||
|
|
[(and (from-x . = . to-x)
|
||
|
|
(from-y . < . to-y))
|
||
|
|
(* pi 3/2)]
|
||
|
|
[(from-x . = . to-x)
|
||
|
|
(* pi 1/2)]
|
||
|
|
[(from-x . < . to-x)
|
||
|
|
(+ pi (atan (/ (- from-y to-y) (- from-x to-x))))]
|
||
|
|
[else
|
||
|
|
(atan (/ (- from-y to-y) (- from-x to-x)))]))
|
||
|
|
(let*-values ([(t1x t1y t1a) (values to-x to-y init-angle)]
|
||
|
|
[(t2x t2y t2a) (turn t1x t1y t1a (/ arrowhead-angle-width 2))]
|
||
|
|
[(t3x t3y t3a) (move t2x t2y t2a arrowhead-long-side)]
|
||
|
|
[(t4x t4y t4a) (turn t1x t1y t1a (- (/ arrowhead-angle-width 2)))]
|
||
|
|
[(t5x t5y t5a) (move t4x t4y t4a arrowhead-long-side)]
|
||
|
|
[(t6x t6y t6a) (move t1x t1y t1a arrowhead-short-side)])
|
||
|
|
(send point1 set-x t1x)
|
||
|
|
(send point1 set-y t1y)
|
||
|
|
(send point2 set-x t3x)
|
||
|
|
(send point2 set-y t3y)
|
||
|
|
(send point3 set-x t6x)
|
||
|
|
(send point3 set-y t6y)
|
||
|
|
(send point4 set-x t5x)
|
||
|
|
(send point4 set-y t5y)))
|
||
|
|
;; HERE!!!
|
||
|
|
|
||
|
|
(define/private (should-hilite? snip)
|
||
|
|
(let ([check-one-way
|
||
|
|
(lambda (way)
|
||
|
|
(let loop ([snip snip])
|
||
|
|
(or (memq snip currently-overs)
|
||
|
|
(and (is-a? snip graph-snip<%>)
|
||
|
|
(loop (car (way snip)))))))])
|
||
|
|
(or (check-one-way (lambda (snip) (send snip get-children)))
|
||
|
|
(check-one-way (lambda (snip) (send snip get-parents))))))
|
||
|
|
|
||
|
|
(inherit get-snip-location)
|
||
|
|
(field [lb (box 0)]
|
||
|
|
[tb (box 0)]
|
||
|
|
[rb (box 0)]
|
||
|
|
[bb (box 0)])
|
||
|
|
(define/private (get-position snip)
|
||
|
|
(get-snip-location snip lb tb #f)
|
||
|
|
(get-snip-location snip rb bb #t)
|
||
|
|
(values (unbox lb)
|
||
|
|
(unbox tb)
|
||
|
|
(- (unbox rb) (unbox lb))
|
||
|
|
(- (unbox bb) (unbox tb))))
|
||
|
|
|
||
|
|
(super-new)))
|
||
|
|
|
||
|
|
;; in-rectangle? : number^2 number^2 number^2 -> boolean
|
||
|
|
;; determines if (x,y) is in the rectangle described
|
||
|
|
;; by (p1x,p1y) and (p2x,p2y).
|
||
|
|
(define (in-rectangle? x y p1x p1y p2x p2y)
|
||
|
|
(and (<= (min p1x p2x) x (max p1x p2x))
|
||
|
|
(<= (min p1y p2y) y (max p1y p2y))))
|
||
|
|
|
||
|
|
;; strict-in-rectangle? : number^2 number^2 number^2 -> boolean
|
||
|
|
;; determines if (x,y) is in the rectangle described
|
||
|
|
;; by (p1x,p1y) and (p2x,p2y), but not on the border
|
||
|
|
(define (strict-in-rectangle? x y p1x p1y p2x p2y)
|
||
|
|
(and (< (min p1x p2x) x (max p1x p2x))
|
||
|
|
(< (min p1y p2y) y (max p1y p2y))))
|
||
|
|
|
||
|
|
;; find-intersection : number^8 -> (values (or/c #f number) (or/c #f number))
|
||
|
|
;; calculates the intersection between two line segments,
|
||
|
|
;; described as pairs of points. Returns #f if they do not intersect
|
||
|
|
(define (find-intersection x1 y1 x2 y2 x3 y3 x4 y4)
|
||
|
|
(let-values ([(m1 b1) (find-mb x1 y1 x2 y2)]
|
||
|
|
[(m2 b2) (find-mb x3 y3 x4 y4)])
|
||
|
|
(let-values ([(int-x int-y)
|
||
|
|
(cond
|
||
|
|
[(and m1 m2 b1 b2
|
||
|
|
(= m1 0)
|
||
|
|
(= m2 0))
|
||
|
|
(values #f #f)]
|
||
|
|
[(and m1 m2 b1 b2
|
||
|
|
(= m1 0))
|
||
|
|
(let* ([y y1]
|
||
|
|
[x (/ (- y b2) m2)])
|
||
|
|
(values x y))]
|
||
|
|
[(and m1 m2 b1 b2
|
||
|
|
(= m2 0))
|
||
|
|
(let* ([y y3]
|
||
|
|
[x (/ (- y b1) m1)])
|
||
|
|
(values x y))]
|
||
|
|
[(and m1 m2 b1 b2
|
||
|
|
(not (= m1 m2)))
|
||
|
|
(let* ([y (/ (- b2 b1) (- m1 m2))]
|
||
|
|
[x (/ (- y b1) m1)])
|
||
|
|
(values x y))]
|
||
|
|
[(and m1 b1)
|
||
|
|
(let* ([x x3]
|
||
|
|
[y (+ (* m1 x) b1)])
|
||
|
|
(values x y))]
|
||
|
|
[(and m2 b2)
|
||
|
|
(let* ([x x1]
|
||
|
|
[y (+ (* m2 x) b2)])
|
||
|
|
(values x y))]
|
||
|
|
[else
|
||
|
|
(values #f #f)])])
|
||
|
|
|
||
|
|
(if (and int-x
|
||
|
|
int-y
|
||
|
|
(<= (min x1 x2) int-x (max x1 x2))
|
||
|
|
(<= (min y1 y2) int-y (max y1 y2))
|
||
|
|
(<= (min x3 x4) int-x (max x3 x4))
|
||
|
|
(<= (min y3 y4) int-y (max y3 y4)))
|
||
|
|
(values int-x int-y)
|
||
|
|
(values #f #f)))))
|
||
|
|
|
||
|
|
;; find-mb : number number number number -> (values (or/c #f number) (or/c #f number))
|
||
|
|
;; finds the "m" and "b" constants that describe the
|
||
|
|
;; lines from (x1, y1) to (x2, y2)
|
||
|
|
(define (find-mb x1 y1 x2 y2)
|
||
|
|
(if (= x1 x2)
|
||
|
|
(values #f #f)
|
||
|
|
(let-values ([(xl yl xr yr)
|
||
|
|
(if (x1 . <= . x2)
|
||
|
|
(values x1 y1 x2 y2)
|
||
|
|
(values x2 y2 x1 y1))])
|
||
|
|
(let* ([m (/ (- yr yl) (- xr xl))]
|
||
|
|
[b (- y1 (* m x1))])
|
||
|
|
(values m b)))))
|
||
|
|
|
||
|
|
;; get-all-relatives : (snip -> (listof snip)) snip -> (listof snip)
|
||
|
|
;; returns all editor-snip relatives (of a particular sort), including
|
||
|
|
;; any regular snip relatives along the way.
|
||
|
|
(define (get-all-relatives get-relatives snip)
|
||
|
|
(let loop ([flat-relatives (get-relatives snip)]
|
||
|
|
[relatives null])
|
||
|
|
(cond
|
||
|
|
[(null? flat-relatives) relatives]
|
||
|
|
[else
|
||
|
|
(let i-loop ([dummy (car flat-relatives)]
|
||
|
|
[acc relatives])
|
||
|
|
(cond
|
||
|
|
[(is-a? dummy graph-snip<%>)
|
||
|
|
(loop (cdr flat-relatives) (cons dummy acc))]
|
||
|
|
[else
|
||
|
|
(i-loop (car (get-relatives dummy))
|
||
|
|
(cons dummy acc))]))])))
|
||
|
|
|
||
|
|
;; get-all-children : snip -> (listof snip)
|
||
|
|
(define (get-all-children snip)
|
||
|
|
(get-all-relatives (lambda (snip) (send snip get-children)) snip))
|
||
|
|
|
||
|
|
;; get-all-parents : snip -> (listof snip)
|
||
|
|
(define (get-all-parents snip)
|
||
|
|
(get-all-relatives (lambda (snip) (send snip get-parents)) snip)))
|
||
|
|
|