[SOLVED] Node labels too large in graphviz output

Node labels too large in graphviz output

I have got a graph defined in dot format as follows:

# mwe.dot

strict graph G {
  1 [ pos="-17.960000,-13.760000" label="C0" ];
  2 [ pos="9.730000,5.710000" label="C1" ];
  3 [ pos="-0.820000,15.530000" label="C2" ];
  4 [ pos="11.090000,8.240000" label="C4" ];
  5 [ pos="8.060000,11.590000" label="C5" ];
  6 [ pos="-12.830000,-12.850000" label="C7" ];
  7 [ pos="17.050000,-2.800000" label="C3" ];
  8 [ pos="1.120000,2.300000" label="C6" ];
  9 [ pos="9.070000,-13.570000" label="C8" ];
  10 [ pos="13.480000,-19.740000" label="C9" ];
  1 -- 6;
  2 -- 3;
  2 -- 4;
  3 -- 5;
  7 -- 8;
  7 -- 9;
  4 -- 5;
  9 -- 10;
}

I want to render it using the x and y coordinates provided in the pos attribute. Running dot -Tpng mwe.dot -O -Kneato -n2 I get this:

output

How do I reduce the size of the labels? (The `-s' option changes nothing).

I am on a M4 Max with this graphviz version:

% dot -v
dot - graphviz version 12.2.1 (20241206.2353)
libdir = "/opt/local/lib/graphviz"
Activated plugin library: libgvplugin_dot_layout.6.dylib
Using layout: dot:dot_layout
Activated plugin library: libgvplugin_core.6.dylib
Using render: dot:core
Using device: dot:dot:core
The plugin configuration file:
    /opt/local/lib/graphviz/config6
        was successfully loaded.
    render  :  cairo dot dot_json fig gd json json0 lasi map pic pov ps quartz svg svg_inline tk vrml xdot xdot_json
    layout  :  circo dot fdp neato nop nop1 nop2 osage patchwork sfdp twopi
    textlayout  :  textlayout
    device  :  bmp canon cgimage cmap cmapx cmapx_np dot dot_json eps exr fig gd gd2 gif gv icns ico imap imap_np ismap jp2 jpe jpeg jpg json json0 kitty kittyz pct pdf pic pict plain plain-ext png pov ps ps2 psd sgi svg svg_inline svgz tga tif tiff tk vrml vt vt-24bit vt-4up vt-6up vt-8up wbmp webp x11 xdot xdot1.2 xdot1.4 xdot_json xlib
    loadimage   :  (lib) bmp eps gd gd2 gif jpe jpeg jpg pdf png ps svg webp xbm

Update

Using the fontsize attribute on nodes does not fix the issue: the text changes size, but the ellipses still cover the whole graph (as before).
Using this website with the nop2 layout engine (which should correspond to the neato engine with the -n2 option, afaik) does format the graph nicely. Any idea why?

Solution

The pos values are in points, not inches, so the nodes will overlap.
Also you want nop, not nop2, as you are not specifying edge layout.
scale will spread out the nodes.
Like so:

strict graph G {
  layout=nop
  scale=10

  1 [ pos="-17.960000,-13.760000" label="C0" ];
  2 [ pos="9.730000,5.710000" label="C1" ];
  3 [ pos="-0.820000,15.530000" label="C2" ];
  4 [ pos="11.090000,8.240000" label="C4" ];
  5 [ pos="8.060000,11.590000" label="C5" ];
  6 [ pos="-12.830000,-12.850000" label="C7" ];
  7 [ pos="17.050000,-2.800000" label="C3" ];
  8 [ pos="1.120000,2.300000" label="C6" ];
  9 [ pos="9.070000,-13.570000" label="C8" ];
  10 [ pos="13.480000,-19.740000" label="C9" ];
  1 -- 6;
  2 -- 3;
  2 -- 4;
  3 -- 5;
  7 -- 8;
  7 -- 9;
  4 -- 5;
  9 -- 10;
}

Giving: