Use CGGeometry

[nicnocquee]

Just a suggestion, but maybe you can just use CGGeometry instead of writing your own? You can use CGRectGetMaxX instead of NSMaxX, etc.

And using prefix NS is a bit risky, Apple might use it and break stuff. Just my 2c.

[malcommac]

This is absolutely right, I'll post a fix soon as I'll have some spare time. Thank you for your report.