Support for non-rounded joins

[robhawkes]

Thanks for putting together a simple library for polygon offsetting – it's a massive headache finding something that isn't part of a larger library!

Are you considering adding support for non-rounded joins, like mitre and bevel joins?

I ask because in the my use-case I don't need the added vertex / point complexity that results from generating rounded joins, as if you need to triangulate the resulting polygon then the number of triangles is multiplied by quite a lot to account for the 'fans' at the corners.

There seems to be a gap for a lightweight offsetting library that can handle the key offsetting operations and the base join and cap types.

I'd look at contributing this myself but from a quick glance at the code-base it's built around the rounded-corner algorithm and I don't want to mess that up by shoe-horning in a naive approach to non-rounded joins.

[w8r]

@robhawkes thanks and check out the new version - old one was actually nasty))
Unfortunately, I didn't figure out yet how to control the joins, I was really going for the easiest approach. I will look into that if I decide to do this algorithm properly