[quote=227477:@Antonio Rinaldi]@Alwyn Bester why do you say that you have trouble with transparency?
From my test (OS X) I see the same color both with a alpha color than with a transparency value[/quote]
I assumed that tracing back over itself when using a transparent color would darken that part of the polyline. (You know what they say about assumptions.)
Thanks for pointing out Atonio that retracing the polygon in fact yields the correct results (as shown in the image above).
This is very good news, for I now have a solution for my problem that won’t require declares at this point, and can be done in pure Xojo.