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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.

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