* exporting Racket images
@ 2017-10-24 1:43 Lawrence Bottorff
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From: Lawrence Bottorff @ 2017-10-24 1:43 UTC (permalink / raw)
To: emacs-orgmode Mailinglist
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I'm using a nice package from a Racket user called MetaPict
<https://github.com/soegaard/metapict>, however, I don't know how to export
the image produced. Here's some Racket code calling MetaPict:
#+begin_src scheme :session mainsession :exports both
(require racket/draw metapict metapict/graph)
(set-curve-pict-size 300 300) ; width and height of image
(ahlength 1.0) ; size of arrow head
(define (f x) (sin x))
(define p
(with-window (window -12 12 -12 12) ; xmin, xmax, ymin, ymax
(draw (draw-arrow (curve (pt -10 0) -- (pt 10 0))) ; x-axis
(draw-arrow (curve (pt 0 -10) -- (pt 0 10))) ; y-axis
(label-rt "x" (pt 10.2 0)) ; label for x
axis
(label-top "y" (pt 0 10.2)) ; label for y
axis
(color "blue" (draw (circle (pt 2 1) 3))) ; center (2,1)
radius 3
(color "red" (draw (graph f -10 10 #:samples 50))))))
(define (save-pict-as-svg p width height filename [exists 'replace])
(define dc (new svg-dc%
[width width]
[height height]
[output filename]
[exists exists]))
(send dc start-doc "An SVG Test") ; a message
(send dc start-page)
(draw-pict p dc 0 0)
(send dc end-page)
(send dc end-doc))
(save-pict-as-svg p 300 300 "images/outtestmetapict1.svg")
#+end_src
No surprise, but orgmode doesn't know that the image output
(save-pict-as-svg p 300 300 "images/outtestmetapict1.svg")
should be the code block's results. And adding #+RESULTS: over a hand-added
[[file:images/outtestmetapict1.svg]] link makes it not display. I'm
guessing this means orgmode does things internally with, say, gnuplot to
make the generated image the results *and *obey the :exports both . . . Any
ideas how I can get this gnuplot-like behavior with Racket MetaPict? I'm
guessing a customization of the underlying babel code is necessary. . . .
LB
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