“In general, the higher level your graphics API, the harder it is to get horizontal and vertical lines to draw on the physical pixels. At the frame buffer level it is trivial. Cocoa and UIKit it is possible with some effort. SwiftUI it is impossible. HTML is hopeless.

“When printing meant writing some Postscript it was a little work, but doable. Getting it onto a printer through a modern printer API is essentially impossible.”

— a comment on Hacker News

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