Today I read a published paper titled “A note on digitized angles”
Knowledge that is directly applicable to computer graphics. Though it is not something I am go to actually be able to solve, the fact that I am aware of the problem with drawing a line that won’t line up with an arrowhead on a rasterised display is important. It also explains why some pixels crawl and flash when the line is rotating. Some of the math is a little above my head, but I got most of it.
The abstract is:
We study the configurations of pixels that occur when two digitized straight lines meet each other.