alt Hacker NewsThe regular way you did graphics with a PDP-10 or 11 was
https://terminals-wiki.org/wiki/index.php/DEC_VK100
It had ANSI escape sequences equivalent to CIRCLE or LINE like you'd find in microcomputer BASIC except the Gigi was much more colorful than any early micro.
Gigi did ReGIS graphics, IIRC. Later VT terminals also did it, but were far less programmable than the Gigi.