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GDI question: the difference between ALTERNATE & WINDING mode?

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HI! I''m learning [Programming Windows 5th edition by Charles Petzold]. The GDI function SetPolyFillMode makes me confused. As mentioned in the book, there are two modes in drawing polygons: ALTERNATE mode & WINDING mode. The problem is I still don''t understand the difference between these two modes Although I read those para for lots of times... Could any one describe a little more clearly to me the difference? Thanks!

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