oo problem

[Nils Oliver Kröger]

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Tool69 wrote:
> It was a matter of choice : in my earlier version, all primitives know
> how to draw themselves, but they needed to have a parent and I found it
> was not good for aesthetic reasons.

Why should a parent reference not be aesthetic? OOD is all about Objects
and their relationships.


> I want now to draw an x-axis on it with some ticks and maybe lables, I
> need to catch the xlowleft and xupright variables of the Paper inside
> my primitive, ok ?

This sentence describes the relationship between the paper and your
Rectangle (to stick to your first example) as an association:

The Rectangle needs to access information from the Paper. Moreover, the
relationship could be named "Rectangle lies on Paper" this is perfect
OOD in my opinion.

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