[PD] Data structures and click event

[Pierre Massat]

Dear list,

First of all i'd like to say that i'm very impressed by the potential of
data structures in Pd. I've always kind of ignored this feature and it's a
pity because it's really worth diving into it.
That being said I think that help and example patches are far from
sufficient for beginners, and if it wasn't for Chris McCormick's
s-abstractions I would have been able to really figure out how to use them
(stuff like how to make an entire polygon draggable, how to use GOP with
proper scaling, etc.).

I m now stuck with a question. How can I identify the element which was
just clicked ? I know that [struc] outputs the events, like click,
selection and change, but I thought I could identify individual elements by
their pointer id. It turns out that I get the same pointer for every
element, although I created them sequentially (using [append]).

(I guess something must be escaping me about pointers... I've noticed that
within the same template, I get different pointers for elements on
different y-levels, but the same pointer for all the element on the same
y-level regardless of their x.)

Cheers,

Pierre
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