Or create a region with a hole through it and use it to clip the drawing.
George
On 9/10/2019 8:12 AM, Robby Findler wrote:
Another trick I use is to crop the picture that is nominally below the
image and then just draw it again, but this time on top.
Robby
On Mon, Sep 9, 2019 at 2:15 PM Jens Axel Søgaard
<jensa...@soegaard.net <mailto:jensa...@soegaard.net>> wrote:
You can use a path with an even-odd-fill to cut out parts.
An example:
#lang racket
(require metapict metapict/polygons)
(define (cutout p x y r)
(defv (w h) (pict-size p))
(with-window (window 0 w 0 h)
(brushstipple (pict->bitmap p)
(eofill (rectangle (pt 0 0) (pt w h))
(circle x y r)))))
(set-curve-pict-size 400 400)
(def p (brushcolor "red" (fill (regular-polygon 5))))
(cutout p 200 200 50)
/Jens Axel
The result (the yellowish color is the background color in my editor):
image.png
Den man. 9. sep. 2019 kl. 20.20 skrev Hendrik Boom
<hend...@topoi.pooq.com <mailto:hend...@topoi.pooq.com>>:
I'm wondering how to cut a transparent hole in something.
Say I have a rectangle and I want to make part of it
transparent so
that I cn see what's behind it.
Drawing a transparent rectangle on top of it won't workm
because it'll
just reveal the original rectangle.
The only way I cn see it to draw the original rectangle in
pieces,
careful avoiding the area I want to make transparent. (that
may be
tricky if the transparent area is, say, a circle).
Is there some convenient operation in Pict that can accomplish
this
more directly? Kind of the union and intersection and
complementation
on constructive solid geometry, but now 2D.
My guess is no. I haven't found it. So I ask.
Maybe I'll need some other drawing tool than Pict. Suggestions
welcome.
-- hendrik
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