If your working with Objective-C and don’t have/haven’t already created a geometry library to suit your needs here’s a couple of open source choices that have popped up.
The first library is MTGeometry from Mysterious Trousers providing a number of C functions that work with Core Graphics Data types.
You can find MTGeometry on Github here.
The second library is from Justin-Sprah Summers of Github (who also created the popular libextobjc Objective-C extension library).
This library provides categories extending the CGGeometry and NSValue classes with a number of geometry functions.
You can find Archimedes on Github here.
Two libraries that should save you a lot of time in case you need to create your own geometry library with Objective -C.
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