[Grace-core] Cross platform graphics library

[Andrew P Black]

Alex,

Thanks so much for sharing this.  I have put a few comments throughout the document, as little yellow “post-it notes”.  Most are suggestions for renaming, simplification, or completeness.

Overall, it’s great that you are discussing this interface.  I was a bit surprised, though, that there were so few objects in the interfaces; it read more like a functional language library, where everything had to be a top-level function because they don’t have objects and methods.  I think that Phix can be simplified a lot if you take advantage of objects.

	Andrew
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