From kde-kimageshop  Tue Dec 28 20:24:20 2004
From: Boudewijn Rempt <boud () valdyas ! org>
Date: Tue, 28 Dec 2004 20:24:20 +0000
To: kde-kimageshop
Subject: Re: transform, selection, paintdevice and layer relations
Message-Id: <200412282124.21752.boud () valdyas ! org>
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On Tuesday 28 December 2004 21:13, Casper Boemann wrote:
> To reply to my own question, or rather give some further input, here is h=
ow
> photoshop does it. I'm not saying that we should do it like that, but it =
is
> always nice to know:
>
> In Photoshop all transforms are done within the layer, and applies to the
> selection (which is associated to the layer). If no selection is active no
> transforms can be done.
>
> Photoshop never creates another layer as a result of a transform. (AFAIK)
>
> going back to krita for a moment, I think this is how we (intend to) do it
> too.
>

This is the behaviour I expect from a paint app:

If there's a selection on the current layer, only the selected pixels in th=
e=20
current layer should be transformed, rotated, scaled or sheared. This happe=
ns=20
within the layer. If the new pixels overlap untransformed pixels, they are=
=20
composed with the giving composite op and opacity.

If there's no selection, a transform on a layer should transform all pixels=
 in=20
a layer, i.e., act as if the layer was completely selected. No new layer is=
=20
created. There is no composition, because the old layer data is completely=
=20
discarded.

If a transform is applied to a image, all layers are transformed. The=20
selection is transformed, too: in the new situation, the layer that has a=20
selection active still has a selection, but the shape of the selection is=20
transformed.

If a layer is moved, the selection moves with the layer (this is not=20
implemented yet).

A transform never creates a new layer (expect perhaps temporarily and it=20
wouldn't be visible to the user).


=2D-=20
Boudewijn Rempt=20
http://www.valdyas.org/fading/index.cgi

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