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similar shadows

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reshaping of the shadow(two)pi layout, closer to a similar semblence, yet still in need of small furthers
This commit is contained in:
nik gaffney 2006-11-26 18:19:12 +01:00
parent f7c0baa625
commit 23ab92bdf7
3 changed files with 38 additions and 34 deletions
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63
punctiform-convergence/layout.scm
View file

@ -41,7 +41,8 @@
(provide wobble-tree
shuffle-tree
relax-tree
shadowpi-tree)
shadowpi-tree
shadowtwopi-tree)
;;;;;; ; ; ;; ;;;; ;; ; ;;
@ -184,48 +185,50 @@
;; for interactive graph visualization and animation" by Andrew Pavlo,
;; Christopher Homan & Jonathan Schull
;;
;; - since each node may have any number of parents, yet only a single child,
;; thi sinterpretation of the algorithm is essentially the same, if 'children'
;; is read as 'parents'
;;
;;;;; ; ;;; ; ;
(define twopi (* 2 pi))
(define (shadowpi-tree node pb x y t1 t2 r)
;; node from whcih to draw the layout, centred at x,y on the containment arc
;; given by t1->t2 with radius, r
(define (shadowpi-tree node pb theta r)
;; given a node from which to draw the layout, angle theta, radius, r
(let* ([parents (send node get-parents)]
[n (length parents)]
[e (length parents)]
[xi (snip-x node)]
[yi (snip-y node)]
(phi 0.75))
(b (/ pi (if (eq? e 0) 1 e)))
(a (- (+ theta (/ pi 2)) (/ b 2)))
(r1 (* 2 r (sin (/ b 2)))))
;; distribute parents of given node evenly along a containment circle
;; centered on the node.
(for-each (lambda (parent)
(let ((x1 (+ xi (* r (cos a))))
(y1 (+ yi (* r (sin a)))))
(send pb move-to parent x1 y1)
(shadowpi-tree parent pb a r1)
(set! a (- a b))))
parents)))
(dotimes (k n)
(let ((parent (list-ref parents k))
(x1 (* r (cos (* (+ t1 (- t2 t1)) (/ k n)))))
(y1 (* r (sin (* (+ t1 (- t2 t1)) (/ k n))))))
(send pb move-to parent
(+ xi x1) (+ yi y1))
;; draw circles around the node’s parents and evenly distribute their
;; parents along containment arcs.
(define (shadowtwopi-tree node pb theta r)
;; given a node from which to draw the layout, angle theta, radius, r
(let* ([parents (send node get-parents)]
[e (length parents)]
[xi (snip-x node)]
[yi (snip-y node)]
(b (/ twopi (if (eq? e 0) 1 e)))
(a (- (+ theta (/ pi 2)) (/ b 2)))
(r1 (* 2 r (sin (/ b 2)))))
(shadowpi-tree parent pb
(+ xi x1) (+ yi y1) ;; centred on
;; distribute parents of given node evenly along a containment circle
;; centered on the node.
(for-each (lambda (parent)
(let ((x1 (+ xi (* r (cos a))))
(y1 (+ yi (* r (sin a)))))
(send pb move-to parent x1 y1)
(shadowpi-tree parent pb a r1)
(set! a (- a b))))
parents)))
(- (atan (/ (- yi (+ yi y1)) (- xi (+ xi x1)))) (/ pi 2))
(+ (/ pi n) (atan (/ (- yi y1) (- xi x1))))
(* r phi)) ;; radius
;; this proceeds recursively, so that successively distant descendants of
;; the goven node are positioned on successively smaller containment arcs.
))))
) ;; end of module

1
qfwfq.scm
View file

@ -59,6 +59,7 @@
relax-tree
eval-tree
shadowpi-tree
shadowtwopi-tree
tree->sexp
to-string

2
xaueneuax.scm
View file

@ -118,7 +118,7 @@
[(#\z) ;; C-z re.colour
(colour-tree selected-snip p)]
[(#\l) ;; C-x re.lapse
(shadowpi-tree selected-snip p 10 10 0 (* 2 pi) 120)]
(shadowtwopi-tree selected-snip p 0 80)]
[(#\=) ;; C-= zoom->out
(send p zoom 1.1)]
[(#\-) ;; C-- zoom->in