On this page:
lt-find
ltl-find
lc-find
lbl-find
lb-find
ct-find
ctl-find
cc-find
cbl-find
cb-find
rt-find
rtl-find
rc-find
rbl-find
rb-find
pict-path?
launder

6 Pict Finders🔗

procedure

(lt-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(ltl-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(lc-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(lbl-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(lb-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(ct-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(ctl-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(cc-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(cbl-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(cb-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(rt-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(rtl-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(rc-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(rbl-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
(rb-find pict find)  
real? real?
  pict : pict-convertible?
  find : pict-path?
Locates a pict designated by find within pict. If find is a pict, then the pict must have been created as some combination involving find.

If find is a list, then the first element of find must be within pict, the second element of find must be within the first element, and so on. In general, the n+1-st element must be within the n-th element, so the list can provide a path to some specific pict, in case there is more than one occurrence of the pict that’s being searched for within pict.

Examples:
> (define p1 (disk 60))
> (define p2 (rectangle 60 60))
> (define p3 (hc-append p1 p2))
> (define p4 (hc-append p3 (arrow 60 0)))
> (lt-find p4 p1)

0

0

> (cb-find p4 p2)

90

60

> (rb-find p3 p1)

60

60

> (lt-find p4 (list p1))

0

0

> (lt-find p4 (list p2 p1))

find-XX: sub-pict: #<pict> not found in: #<pict>

> (lt-find p4 (list p2))

60

0

> (lt-find p4 (list p3 p2))

60

0

> (pin-over p4 p2 lt-find
            (colorize (text "lt-find") "darkgreen"))

image

> (panorama
   (pin-over p4 p2 rb-find
             (colorize (text "rb-find") "darkgreen")))

image

Changed in version 1.11 of package pict-lib: Removed implicit truncation of some centered coordinates to integers.

procedure

(pict-path? v)  boolean?

  v : any/c
Returns #t if v is a pict-convertible? or a non-empty list of pict-convertible?s.

Examples:
> (pict-path? null)

#f

> (pict-path? (disk 30))

#t

> (pict-path? (list (disk 30) (rectangle 10 10)))

#t

procedure

(launder pict)  pict?

  pict : pict-convertible?
Creates a pict that has the same drawing and bounding box of pict, but which hides all of its sub-picts so that they cannot be found with functions like lt-find. If pict has a last-line pict, then the laundered pict has a fresh last-line pict with the same shape and location.

Examples:
> (define p1 (disk 60))
> (define p2 (rectangle 60 60))
> (define p3 (hc-append p1 p2))
> (lt-find (launder p4) p3)

find-XX: sub-pict: #<pict> not found in: #<pict>