dot

rpic extension, inspired by Pikchr. dot places a tiny solid circle — the junction marker every wiring diagram needs, native instead of the classic circuit-macros dot(P) macro idiom.

.PS
box "in" wid 0.55 ht 0.4
line right 0.4
H: Here
arrow right 0.4
box "out" wid 0.55 ht 0.4
dot at H
line -> from H down 0.5 then right 0.4
box "log" wid 0.55 ht 0.4
.PE

Rules

• Radius defaults to the dotrad variable (0.035 in, tracks scale); rad/diam override per dot.
• Solid by default (gray-0 fill); colored, shaded or fill restyle it:

.PS
dot at (0, 0)
dot at (0.4, 0) rad 0.06
dot at (0.8, 0) colored "firebrick"
dotrad = 0.02
dot at (1.2, 0)
"default · rad 0.06 · colored · dotrad 0.02" at (0.6, -0.3)
.PE

• A dot is a normal (tiny) closed object: compass anchors, at/with, class hooks — and it counts as a circle for ordinals (last circle).
• Contextual: dot = 2 stays an ordinary assignment.
• Neither classic pic nor dpic has dot (dpic reads it as a variable) — in classic sources, keep the macro idiom (define dot { circle rad 0.035 fill 0 at $1 }), which renders byte-identically.

The circuit library’s old dot(P) macro was retired in favor of the primitive; corpus figures render byte-for-byte the same.