How to 'crop' a g-code

[magicniner]

Nick, I'm sorry to tell you that this complex mathematical problem is done by a computer in less than a second, by comparing 50k points against a 12 points defined polygon.

Paulus,
I'm sorry to have to tell you that how quickly a computer runs a chink of code has no relationship to the complexity of the maths used by the programmer to address the problem or how smart the programmer had to be to write the code :D

Or could any dummy have done the job? ;-)