[Scilab-users] question on graphic children order

[Stéphane Mottelet]

Hello,

Le 07/04/2019 à 10:13, Federico Miyara a écrit :
>
> Dear all,
>
> I would like to know if there is a reason for the fact that whenever 
> new graphic objects are added to an axes, the last one that has been 
> created is always the one with index 1 instead of n+1 (where n is the 
> number of objects prior to new one).
>
> Example:
>
> scf(1)
> clf(1)
>
> // Plot a simple two-point graph
> plot2d([0, 1], [0, 1])
> ax = gca()
>
> // Colect plotted data
> a = ax.children(1).children.data
>
> // Plot a simple two-point graph
> plot2d([0, 1],[0.5, 1.5])
>
> // Colect plotted data corresponding to index 1
> b = ax.children(1).children.data
>
> // Colect plotted data corresponding to index 2
> c = ax.children(2).children.data
>
> After the first plot we get
>
> a  =
>    0.   0.
>    1.   1.
>
> After the second plot we get
>
> b  =
>    0.   0.5
>    1.   1.5
>
> c  =
>
>    0.   0.
>    1.   1.
>
> I would expect that b = a, i.e, once a children object has been 
> created on the axes, it would be reasonable that its index were kept 
> constant. The current behavior is as if each new object were inserted 
> in the structure before the previous one instead of after it.

I would say that the set of children is a stack, i.e. each new child is 
"pushed" on top. Anyway, relying on child order seems, to me, a bad 
idea. For example, legend takes as (optional) first argument an array of 
handles, and not an array of child numbers.

S.

>
> Regards,
>
> Federico Miyara
>
>
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