Anti aliasing diagonal lines and arc? ╭ ╮ ╰ ╯ ╱ ╲ ╳

[christianparpart]

In the spirit of #308 I am looking for also nicely drawing diagonals as well as arc lines.

We have quite some library proposals. Maybe we also find a library hat could help creating anti aliased diagonal and arc lines?

I am having a small code path to simply fallback to font based box drawing, but that would not be pixel-perfect then.

Maybe someone has an idea?

[christianparpart]

Turns out g4g isn't too unhelpful, not yet antialiased, but half step through for arc lines: https://www.geeksforgeeks.org/midpoint-ellipse-drawing-algorithm/

[christianparpart]

SSAA https://en.wikipedia.org/wiki/Supersampling

[christianparpart]

implemented