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model/view object graph

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I have a graph of node and leaf objects that represent model data.
Now I want to render these in a view.
I'd like to have a Shape object for each leaf which maps the model
data to something renderable.

I don't want any view references in my model. The only way I can think to
do this is have a parallel NodeView/LeafView graph, where a LeafView
object is a composition of Leaf and the Shape.

I'm certain it would be bad for LeafView to subclass Leaf

I could construct the shape objects on the fly, but I'm not sure, with
primitive graphics rendering, aren't they usually cached.

Mike W

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