Dear co-scilabers,
I am wondering about the hidden "uid" property of all graphical objects :
--> plot()
--> gcf().uid
ans =
581.
--> gca().uid
ans =
628.
--> gce().uid
ans =
675.
It is a protected property, and it's OK:
--> gca().uid=500
Unknown property: uid.
*Question #1*: this property is not displayed. Is it on purpose?
*Question #2*: What can we do with this property? In particular, can we
call directly some java routines with it, and then: How (example)?
I was digging around this uid, because i am searching for a robust --
and if possible built-in -- way to declare that a graphical component
relies on another one. Examples :
* a label of a contour line is "ascribed" to this line
* a colorbar (that is an axes in its own) is related to a given other axes
* etc.
Of course, it is possible to use the .tag property of the "parent"
object (the line, the colored axes,..), and register it in the .userdata
property of the "child" (the label, the colorbar..). And may be i will
finally do things in this way.
But since there is this ".uid" that has the main advantage to be unique,
with which we are sure that there was no id collision, i was wondering
about it.
From here to there, i was wondering about the robustness of these uid
values when saving in a file a figure or a graphical component, and then
reloading it 2 months later. It comes that .uid values ascribed to the
reloaded objects are NOT the original ones. So, unfortunately, referring
to uid to link objects is not robust...
So, if anyone knows
* something about questions #1 and #2
* how to avoid using the .tag to declare robust links between
graphical objects
Hope reading you.
Best regards
Samuel
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