Le 10/04/2019 à 01:24, Federico Miyara a écrit :


Antoine,

Thank you for your suggestion. It's a good one, but I still don't know the reason why the index of the current entity is 1 (my question was not really about workarounds but reasons). Stéphane said it was a stack, but as far as I could find, there is no stack structure in Scilab 6.

It was an image. The graphics objects tree is not built at the interpreter level but internally with, at the end, Java objects. In

modules/graphic_objects/src/java/org/scilab/modules/graphic_objects/graphicObject/GraphicObject.java

you can see that the set of children of a graphic object is a (Java) list

    /** Child objects list. Known by their UID */
    private List <Integer> children;

When a children is added to a graphic object, the the method "addChild" is invoked. In the source you can see

    public void addChild(Integer child) {
        children.add(0, child);
    }

Which is coherent with the actual behavior i.e. news children are pushed on the top.

What you would like is simply (without the 0)

    public void addChild(Integer child) {
        children.add(child);
    }

If I have time I can see if it breaks other things, but I am almost sure that it will...

S.




On 09/04/2019 04:22, Antoine Monmayrant wrote:
Hello,

As Stéphane said, using a tag and findobj is a possibility that I use for complex layouts. Here is another one: build your own vector of handles that you order the way you want:

as=[];
subplot(221)
plot(1,2)
as=[as,gca()]
subplot(222)
plot(1:2,2:3)
as=[as,gca()]
subplot(223)
plot(2*[1:2],2:3)
as=[as,gca()]
subplot(224)
plot(2*[1:2],-[2:3])
as=[as,gca()]
as.foreground=color('gray');
as.background=color('lightgray');
as.thickness=2;
as.font_size=4;

Cheers,

Antoine

Le 09/04/2019 à 08:30, P M a écrit :
Federico...thanks for asking the question.
I was wondering about it myself for quite some time.
Once recognizing the fact, I just accepted that new entities are placed at the first position. However, it might be interesting to get some insight of why it is like this....for now I guessed it has to do with how to handle memory.

Philipp


Am Mo., 8. Apr. 2019 um 23:01 Uhr schrieb Stéphane Mottelet <stephane.motte...@utc.fr <mailto:stephane.motte...@utc.fr>>:

    Le 08/04/2019 à 22:56, Federico Miyara a écrit :


    Stéphane,

    Sometimes one just needs to extract some parameter from an
    entity and indexing is a valid way to access it.

    So what is your problem since you know that the order of
    entities is, though not natural, reproductible ? If you really
    need to recover a deeply hidden entity, use tags and the
    findobj() function.

    S.


    Federico


    On 08/04/2019 12:18, Stéphane Mottelet wrote:

    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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