▼Pict:   Functional Pictures
On this page:
inset
clip-descent
clip-ascent
lift-above-baseline
drop-below-ascent
baseless
refocus
panorama
use-last
use-last*
  top  ← prev  up  next → 

5 Bounding Box Adjusters

procedure

(inset pict amt) → pict?

  pict : pict-convertible?
  amt : real?
(inset pict h-amt v-amt) → pict?
  pict : pict-convertible?
  h-amt : real?
  v-amt : real?
(inset pict l-amt t-amt r-amt b-amt) → pict?
  pict : pict-convertible?
  l-amt : real?
  t-amt : real?
  r-amt : real?
  b-amt : real?
Extends pict’s bounding box by adding the given amounts to the corresponding sides; ascent and descent are extended, too.

Examples:
> (pict-width (disk 40))

40

> (pict-width (inset (disk 40) -10))

20

procedure

(clip-descent pict) → pict?

  pict : pict-convertible?
Truncates pict’s bounding box by removing the descent part.

Examples:
> (frame (text "gjy" null 50))

image

> (frame (clip-descent (text "gjy" null 50)))

image

procedure

(clip-ascent pict) → pict?

  pict : pict-convertible?
Truncates pict’s bounding box by removing the ascent part.

Examples:
> (frame (text "gjy" null 50))

image

> (frame (clip-ascent (text "gjy" null 50)))

image

procedure

(lift-above-baseline pict amt) → pict?

  pict : pict-convertible?
  amt : real?
Lifts pict relative to its baseline, extending the bounding box height if necessary.

Examples:
> (frame (hbl-append (text "ijijij" null 50)
                     (text "abc" null 50)))

image

> (frame (hbl-append (lift-above-baseline (text "ijijij" null 50) 20)
                     (text "abc" null 50)))

image

procedure

(drop-below-ascent pict amt) → pict?

  pict : pict-convertible?
  amt : real?
Drops pict relative to its ascent line, extending the bounding box height if necessary.

Examples:
> (define txt (text "ijgy" null 50))
> (frame (hbl-append txt (text "abc" null 50)))

image

> (frame (hbl-append (drop-below-ascent txt 20)
                     (text "abc" null 50)))

image

procedure

(baseless pict) → pict?

  pict : pict-convertible?
Makes the descent 0 and the ascent the same as the height.

Examples:
> (frame (hbl-append (text "gjy" null 50)
                     (text "abc" null 50)))

image

> (frame (hbl-append (baseless (text "gjy" null 50))
                     (text "abc" null 50)))

image

procedure

(refocus pict sub-pict) → pict?

  pict : pict-convertible?
  sub-pict : pict-convertible?
Assuming that sub-pict can be found within pict, shifts the overall bounding box to that of sub-pict (but preserving all the drawing of pict). The last element, as reported by pict-last is also set to (or (pict-last sub-pict) sub-pict).

Examples:
> (define p1 (filled-rectangle 50 50 #:color "darkkhaki"))
> (define p2 (filled-rectangle 30 30 #:color "sienna"))
> (define combined (cc-superimpose p1 p2))
> combined

image

> (refocus combined p2)

image

procedure

(panorama pict) → pict?

  pict : pict-convertible?
Shifts the given pict’s bounding box to enclose the bounding boxes of all sub-picts (even laundered picts).

Examples:
> (define p1 (filled-rectangle 50 50 #:color "maroon"))
> (define p2 (disk 30 #:color "tomato"))
> (define combined (cc-superimpose p1 p2))
> (refocus combined p2)

image

> (panorama (refocus combined p2))

image

procedure

(use-last pict sub-pict) → pict?

  pict : pict-convertible?
  sub-pict : pict-path?
Returns a pict like pict, but with the last element (as reported by pict-last) set to sub-pict. The sub-pict must exist as a sub-pict (or path of sub-picts) within pict.

procedure

(use-last* pict sub-pict) → pict?

  pict : pict-convertible?
  sub-pict : pict-convertible?
Propagates the last element of sub-pict to pict.

That is, use-last* is like use-last, but the last element of sub-pict is used as the new last element for pict, instead of sub-pict itself—unless (pict-last sub-pict) is #f, in which case sub-pict is used as the last element of pict.

  top  ← prev  up  next →