> Putting a constraint like:
>  aRectangle truncated extent = aRectangle extent truncated
> whatever the coordinate transform is does not sound easy: maths say it is
> simply impossible even without a rotation (unless rectangle sides are 3*n
> and 4*n).
Oops, i'm confusing extent and diagonal (extent r)

>

I have a first extension to propose in cs attachment about rounding.

I will then stop on truncation and round off, in fact this was just an example 
to better understand in which way i can be usefull and how decisions are 
taken.
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