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That 75% is the most complex stuff though, like:
-Printing
-Output to various formats
-Page rendering engine
-Antialiased diagram engine
-HTML upload to website
-PDF output with embedded CJK font
-Custom lines
-Page size selection
-Page range selection
What still has to be done is everything connected to making the actual diagrams look like they should look, and to a few more layout-related issues.