[CREATE] [OpenRaster] improve interpretation of layer group offsets

[Boudewijn Rempt]

Hm... I'm pretty sure that the original intention never was to make the
layers inside a group have coordinates relative to the group layer's
x,y coordinates. Moving a group in Krita just moves the contained layers.

So, I would simply amend this to "groups don't have x,y coordinates".


On Mon, 11 Jan 2016, Andrew Chadwick wrote:

> There is some confusion in the GIMP bug tracker about how OpenRaster
> layer stack offsets apply:
>
> https://bugzilla.gnome.org/show_bug.cgi?id=760348
>
> Do we need some clarifying language in
> https://wiki.freedesktop.org/www/Specifications/OpenRaster/Draft/LayersStack/
> ?
>
>
> I propose:
>
> ---------------8< -----------------
>
> x and y attributes
>
> These attributes define the offset of the layer or stack relative to
> its parent. These are signed integers with a default value of 0. These
> attributes must not be set on the root stack element: the root stack
> has zero offset.
>
> The offset of a layer or a stack must be calculated relative to the
> calculated offset of its parent stack. For the example above, the
> "OpenRaster Logo" layer has coordinates (x=15, y=5) in the image's
> coordinate system.
>
> The X axis is oriented from left to right, and the Y axis is oriented downwards.
>
> --------------->8 -----------------
>
> It's probably worth having a para about Y having the usual computer
> graphic interpretation too, so I added that.
>
>
> -- 
> Andrew Chadwick
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-- 
Boudewijn Rempt | http://www.krita.org, http://www.valdyas.org