ODF angle in draw:transform are in degrees
Dennis E. Hamilton
dennis.hamilton at acm.org
Sat Aug 11 09:28:01 PDT 2012
The proposal that Regina brought to the ODF TC is safer. It does not depend on attempting to identify the producer. (In fact, the ODF specification says that the generator identification is *not* to be used in this manner. It is also unreliably used.)
The idea is to face reality and affirm that draw:angle has an integer value that expresses the angle in units of 1/10-th degree. (There are other aspects of this problem that are not so clean cut.)
This supports alignment on the present reality and preserves the interoperability that is afforded with that treatment.
The next step is to come up with a new attribute (or attributes) that correspond to SVG provisions and are rigorously defined. The new attribute(s) would appear down-level (i.e., in ODF 1.0/1.1/IS26300/1.2) as extensions and be ignored but be official in ODF 1.3 (which would deprecate but not remove draw:angle).
If the SVG-aligned attributes are present (and to be required in ODF 1.3 documents, let's say) and recognized, they would over-rule draw:angle. ODF 1.3 Producers that wanted to ensure down-level interoperability would produce both attributes.
How does that sound?
From: libreoffice-bounces+dennis.hamilton=acm.org at lists.freedesktop.org [mailto:libreoffice-bounces+dennis.hamilton=acm.org at lists.freedesktop.org] On Behalf Of Noel Grandin
Sent: Friday, August 10, 2012 23:58
To: Apache OpenOffice dev
Subject: Re: ODF angle in draw:transform are in degrees
One way would be to add a new attribute specifying either degrees or radians.
Then modify the loader code so it looks at the application that
created the file to determine what it should do in cases where there
is not attribute.
Fundamentally, I don't see that there is a "perfect" solution to this.
On Thu, Aug 9, 2012 at 3:41 PM, Regina Henschel <rb.henschel at t-online.de> wrote:
> there is a problem which I have not addressed in the Wiki (see other mail).
> As far as I see, the specification ODF 1.1 has no setting for the unit of
> the angles, but ODF 1.2 set it to "degrees". SVG has it in degrees too, so
> this setting is reasonable.
> But our implementation uses "radians". So there are a lot of documents out,
> that have the angle in radians in the document.
> Any idea how to proceed?
> Kind regards
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> LibreOffice at lists.freedesktop.org
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