Re: graph drawing tool of possible interest

On Sun, May 10, 2026 at 19:33 (-0400), Aditya Mahajan wrote:

> On Sun, 10 May 2026, Jim via ntg-context wrote:

>> At https://github.com/Ndolam/Graphic there is a Qt5-based tool which lets
>> you create graph drawings of a number of built-in graph types, and lets you
>> edit those as well as combine smaller drawings into larger ones.  One of
>> its export formats is ConTeXt-style TikZ.

>> [...]

>> A PDF (and .tex file) showing three of the built-in graph types is
>> attached.

>>From one of the examples:

> \placefigure[nonumber]{A (3,3) Dutch windmill}{
> \starttikzpicture[x=1in, y=1in, xscale=1, yscale=1,
> 	n/.style={fill=white, draw=black, shape=circle,
> 	minimum size=0.2in, inner sep=0, font={\switchtobodyfont[12pt]},
> 	line width=0.0061in},
> 	e/.style={draw=black, line width=0.0061in},
> l/.style={font={\switchtobodyfont[12pt]}}]
> \node (v0) at (-0.5117,0.0000) [n] {$$};
> \node (v1) at (-0.3883,1.5588) [n] {$$};
> \node (v2) at (-0.9000,0.6726) [n] {$$};
> \node (v3) at (0.9000,0.6726) [n] {$$};
> \node (v4) at (0.3883,1.5588) [n] {$$};
> \node (v5) at (0.0000,0.7438) [n] {$$};
> \node (v6) at (0.5117,0.0000) [n] {$$};
> \path (v0) edge[e] node[l] {$$} (v2);
> \path (v0) edge[e] node[l] {$$} (v5);
> \path (v1) edge[e] node[l] {$$} (v4);
> \path (v1) edge[e] node[l] {$$} (v5);
> \path (v2) edge[e] node[l] {$$} (v5);
> \path (v3) edge[e] node[l] {$$} (v6);
> \path (v3) edge[e] node[l] {$$} (v5);
> \path (v4) edge[e] node[l] {$$} (v5);
> \path (v6) edge[e] node[l] {$$} (v5);
> \stoptikzpicture
> }

> Note that 

> \placefigure[..]{...}{
> \starttikzpicture
> ...
> \stoptikzpicture
> }

> will introduce a spurious space: Better to use

> \placefigure[..]{...}{%
> \starttikzpicture
> ...
> \stoptikzpicture
> }

> or 

> \placefigure[..]{...}
>   {\starttikzpicture
>   ...
>   \stoptikzpicture}

Aditya,

Right you are about the space.

After generating the TikZ code with Graphic, I just added the \placefigures
by hand to display the output, and wasn't as careful as I should have been
(and would have been for a "real" document).

> Plus, I am surprised that

>   \path (v0) edge[e] node[l] {$$} (v2);

> actually compiles! 

I will admit I was surprised a long time ago when I first saw that $$
compiles; I've been using that for so long I don't know where I originally
saw that it worked.  (Maybe TikZ does something heavy-handed to make sure
you don't try to do display math inside a node.)  I could output the code
without it, but I wanted to make the TikZ as easy to (post-)edit by hand as
possible.  (Which comes at the cost of having spurious math-on/math-off
characters.)

Cheers.
                                Jim
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