So here is two quick sketches of ideas for objects related to this: [coords] and [canvasvisible]. coords you can already get from iemguts, and I'm planning on submitting [canvasvisible] for inclusion in iemguts.
https://github.com/pd-projects/info
.hc
Computer science is no more related to the computer than astronomy is related to the telescope. -Edsger Dykstra