Re: graphics stacking order

[Shai Ayal]

On Fri, Nov 27, 2009 at 10:03 PM, Ben Abbott <address@hidden> wrote:
> On Nov 27, 2009, at 2:33 PM, Shai Ayal <address@hidden> wrote:
>
>> On Fri, Nov 27, 2009 at 8:16 PM, Ben Abbott <address@hidden> wrote:
>>>
>>> On Nov 27, 2009, at 12:43 PM, Shai Ayal wrote:
>>>
>>>> Hi,
>>>>
>>>> while trying to get colorbar to work, I realized I'm not sure what the
>>>> graphics stacking order (that is what object should be in front)
>>>> should be.
>>>>
>>>> consider the following code:
>>>>
>>>> clf ();
>>>> ax1 = gca ();
>>>> sombrero (); # just so that we have something drawn
>>>> ax2 = axes ("position", [0.3, 0.3, 0.2, 0.2]);
>>>> ch=get (gcf (), "children")
>>>>
>>>> with current tip I see ax1 drawn on top of ax2, (both in gnuplot and
>>>> fltk) and ch = [ax2;ax1]
>>>> I couldn't find a reference for what matlab would do. I'm pretty sure
>>>> that at least ax2 should be drawn on top of a1, but I'm not sure about
>>>> the order of ch. Can anyone try on matlab and report?
>>>>
>>>> Shai
>>>
>>>
>>> Octave orders the objects in the same way as Matlab.
>>>
>>> Here's a simple illustration using Matlab.
>>>
>>>>> x = 0:1;
>>>>> plot (x,x,  x,x,  x,x,  x,x,  x,x,  x,x,  x,x)
>>>>> ch = get (gca, 'children');
>>>>> cell2mat (get (ch, 'color'))
>>>
>>> ans =
>>>
>>>        0.25         0.25         0.25
>>>        0.75         0.75            0
>>>        0.75            0         0.75
>>>           0         0.75         0.75
>>>           1            0            0
>>>           0          0.5            0
>>>           0            0            1
>>>
>>>>> get (gca, 'colororder')
>>>
>>> ans =
>>>
>>>           0            0            1
>>>           0          0.5            0
>>>           1            0            0
>>>           0         0.75         0.75
>>>        0.75            0         0.75
>>>        0.75         0.75            0
>>>        0.25         0.25         0.25
>>>
>> I'm sorry for being so dense, but it's too late at night to try to
>> decipher your example.
>> Can you please elaborate?
>> what is the order of the children (i,e, when I add a new child, does
>> it go before or after the current children in the children vector)?
>> does the first child get to be on top when drawing?
>>
>> Shai
>
> The last child created is the first in the list ... Which is counter to
> expectation, at least my expectation.
So when painting, the first handle on the list is drawn on top of all others?

Shai