Make small scripts to draw with the drawing editor

#1

Hello, I did some tests with the drawing editor. (see attached screenshot)

Capture%20du%202022-05-27%2014-24-22
Capture du 2022-05-27 14-24-22.png981×477 32.1 KB

I can’t use multiple instructions to work in the same window?
I can’t get the “$for” loop to work directly: maybe that’s not possible?
I am interested in this to try to put graduations there.
It is certainly possible.
I’m not a computer expert but I want to learn. I’ve already managed to make myself a few “TeXmacs” commands that make my life easier.
Thanks for your help.

#2

I have the suspicion that for loops draw and successively delete the graphical objects relative to each of their iterations: in fact I am able to draw only one line at a time using the $for command.

I know how to draw using Scheme commands though, outside of the drawing editor. Please take a look at https://texmacs.gitee.io/notes/docs/scheme-graphics.html

#3

Something like this seems to work:

($graphical
 ($for (t (.. 1 5))
  ($line ($point 0 0) ($point 1 t))
  ))
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#4

And the $graphical form allows as well multiple instructions, I just verified it.

For example this works:

(begin (define ($star-line x y)
  ($line ($point 0 0) ($point x y)))

($graphical ($for (t (.. 1 5)) ($line ($point 0 0) ($point 1 t)) )
       ($line ($point 2 2) ($point -2 -2))
       ($star-line -3 0)))

The begin form allows to execute all of several forms, which cannot be put inside the $graphical form, like function definitions (just verified).

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#5

Thank you for your answers which are exactly what I expected.
With a few more commands,
(in the gui-markup.scm file), this allows to play with the drawing editor.

#6

Nice to hear it.

Please note that if

is part of the TeXmacs distribution, it will be overwritten when you install a new TeXmacs version, so you need to save a copy of your commands somewhere else.