How to fix polygon winding

[ya-ponchik]

I have some non-intersecting polygons with holes, but their winding is messed. Can i fix them reilable using existing library methods?

[philstopford]

You don't provide examples, but if you cast your eye over the docs, you might find that a union with an appropriate filling rule will give you consistent winding on your outputs :

https://www.angusj.com/clipper2/Docs/Units/Clipper/Types/FillRule.htm

[philstopford]

Again, if you have a test case, it would be a lot easier to help... Something with the Paths defined in this varying way would be fine. Doesn't need to be more than that - a code-based example to make clear what you have as input and what you'd expect as output.

[philstopford]

Not sure why that warrants a thumbs-down response, but if you're looking for help, making it actually easy for others to help is kind of in your interest. If you don't want to invest that minimal effort, I'm not sure what to say other than "good luck".

[ya-ponchik]

I wrote working solution in 1 minute. Now I just want to hear different opinions. I think i explained the problem VERY clearly. Your request make me think you're not very good at subject and I will waste my time preparing test data :)

[mmassing]

oh dear

[philstopford]

Well done. Glad you figured it out on your own. No need to bother with test data, I guess, since you are up and running. Have fun.

[AngusJohnson]

I have some non-intersecting polygons with holes, but their winding is messed. Can i fix them reilable using existing library methods?

If your existing polygons don't also self intersect, then you could use the Clipper library to Union them using EvenOdd filling. The polygons that result from that operation would then comply with either EvenOdd or NonZero filling.