Single Polygon (or MultiPolygon) from Polygon with interiors

[flaport]

Hi,

Is there a way to create a single polygon without any interiors from a polygon with interiors?

Something like this?

I'm trying to use your library for processing of GDSII shapes, which does not support polygons with holes.

[michaelkirk]

Just to make sure I understand your situation, in the example you're showing, you ultimately want to create a polygon whose exterior will have overlapping segments, and is thus "invalid" (in terms of OGC validity anyway).

Am I understanding the desired result correctly?

I don't know of an off the shelf way to do that, but maybe using:

https://docs.rs/geo/latest/geo/algorithm/closest_point/trait.ClosestPoint.html you could stitch each interior ring into the exterior.

And beware of winding order. See https://docs.rs/geo/latest/geo/algorithm/winding_order/trait.Winding.html if you need to do any re-winding.

[flaport]

Indeed, it's such an 'invalid' polygon I want.

In fact, it's a common operation we do after processing GDS Files. Tools like KLayout (with Ruby and Python bindings) implement it by default on write. But I'm experimenting with Rust to hopefully improve some of the performance of my algorithms, so I I'm looking if there are any options out there. So far GeoRust has been filling in the gap pretty well!

I will try your suggestion! Thanks :)