Tool69 a écrit :
> Hi,
> I've got a simple but difficult problem :
>
> Suppose I've got a Paper class, on wich I can draw i.e a rectangle, a
> circle or whatever.
>
> class Paper(...):
> def __init__(self, paperx, papery):
> self.paperx = paperx
> self.papery = papery
> ....
> def draw(self, Primitive_Object):
> ....
> class Rectangle( ): <--- a Primitive_Object
> ...
>
> Now, inside my Rectangle class, I need to recover the Paper instance
> who called it (because I need the paper sizes to calculate something).
> I now I can use a global variable, say " _paper" and then, inside my
> Paper.__init__() write something like this :
>
> global _paper
> _paper = [paperx,papery]
>
> But it has drawbacks :
Indeed...
> what if I've got several Paper instances ?
class Paper(...):
> ....
def draw(self, drawable):
drawable.draw(self)
class Rectangle( ): <--- a drawable
...
def draw(self, drawing_surface):
...
Now consider whether you really need Paper.draw...
HTH
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