Re: graphics stacking order

[Ben Abbott]

On Nov 27, 2009, at 3:06 PM, Shai Ayal <address@hidden> wrote:

> 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

Yes, that is my understanding.

Ben