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Not the author but I'm making a similar tool currently, and the reality is no because of the nature of it being character based.

You can theoretically have "artistic" polygons where it renders using a mixture of characters to emulate how that grid would be filled if a certain shaped was laid over it but the end result wouldn't be very functional for the purposes of diagramming.

If we have syntax highlighting build into the TrueType font, can’t we also get sticky lines with the same mechanism? It would then only work with the right font obviously.

https://cascii.app can :)

It's not an ascii renderer, but a ascii diagram drawing tool