SVG in realtime

Question

I'm curious about this presentation in emacs:

SVG in emacs realtime

I could make it working, but refreshing the image manually, following this question and using the svg package, So I would try to do it in real time using ielm.

It seems that the problem is the major-mode image-mode with Imagemagick. If I use fundamental mode, it works, not well, but it works. In which mode should I open that buffer?

Answer 1

Thanks to the comments of @xuchunyang, it was easy enough to figure and answer to this question just for the sake of completion. the easy way is open ielm (M-x ielm), and split the buufer in Two, then on one ielm do:

*** Welcome to IELM ***  Type (describe-mode) for help.
ELISP> (require 'svg)
svg

ELISP> (find-file "test-buffer")
#<buffer test-buffer>
ELISP> ;; create the svg
ELISP> (setf svg (svg-create 400 400))
(svg
 ((width . 400)
  (height . 400)
  (version . "1.1")
  (xmlns . "http://www.w3.org/2000/svg")))

ELISP> (svg-insert-image svg)
((width . 400)
 (height . 400)
 (version . "1.1")
 (xmlns . "http://www.w3.org/2000/svg")
 (:image . #<marker at 1 in test-buffer>))

ELISP> (svg-circle svg 200 200 50)
nil
ELISP> (svg-rectangle svg 100 100 200 200)
nil
ELISP> svg
(svg
 ((width . 400)
  (height . 400)
  (version . "1.1")
  (xmlns . "http://www.w3.org/2000/svg")
  (:image . #<marker at 1 in test-buffer>))
 (circle
  ((cx . 200)
   (cy . 200)
   (r . 50)))
 (rect
  ((width . 200)
   (height . 200)
   (x . 100)
   (y . 100))))

the result is pretty awesome, not this draw, but to see how is easy is to create an svg archive in emacs and view the results

The svg package inuded in emacs is easy to read and to learn for use

ELISP> (info "(elisp) SVG Images")