by Darius Kazemi, June 30 2019

In 2019 I'm reading one RFC a day in chronological order starting from the very first one. More on this project here. There is a table of contents for all my RFC posts.

Fractional displacements

RFC-181 is titled “Modifications to RFC #177”. It's authored by John McConnell of NASA Ames Research Center and dated June 27th, 1971.

The technical content

This RFC fixes a problem with the graphics display specification in RFC-177. The problem is that the specification was supposed to make it impossible to draw outside of the border of the screen, but it turns out there are some ways to send coordinates that draw outside the border. So coordinates will now be “fractional displacements” from an origin.

There are also some tweaks made to make it easier to transform a graphics display list (aka a list of drawing commands) from one coordinate system to another.

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About me

I'm Darius Kazemi. I'm an independent technologist and artist. I do a lot of work on the decentralized web with ActivityPub, including a Node.js reference implementation, an RSS-to-ActivityPub converter, and a fork of Mastodon, called Hometown. You can support my work via my Patreon.