Transform point using localToSceneTransform
martin.desruisseaux at geomatys.fr
Thu Jul 26 03:14:20 PDT 2012
Le 26/07/12 11:23, Kirill.Prazdnikov a écrit :
> So then one class representing en element of R3 space would be enough
> for me to develop R3 math.
> Probably I do not see advantage of having two classes representing the
> same ?
I think it is about safety in preventing non-sense operations. We see
similar situations in lot of cases. In physics for instance, Torque and
Work both have the same units of measurement (N*m), so mathematically
they could be added, but units libraries will often use two different
classes for those two kind of measures precisely for preventing their
Same for temperature: multiplying 2°C by a scalar is okay if the 2°C
value is a temperature interval, but physically non-sense if it is a
temperature measurement (however multiplying 2°K would be okay). So even
if we are in the same space, the set of allowed operations depend if the
numerical value is a position or an interval.
So the issue (as I understand it) is whatever we consider that it is
user's responsibility to understand what he is doing, or we protect him
against misuses (either accidental or by misunderstanding).
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