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Re: [cssom-view] ISSUE-4: Coordinate space of the return value of getBoxQuads()

From: Robert O'Callahan <robert@ocallahan.org>
Date: Wed, 2 Jul 2014 22:26:54 +1200
Message-ID: <CAOp6jLZQwpRVHRXnkD2H96=ZOsihvNqPf5zM6xtJLUsnjzkiTA@mail.gmail.com>
To: "Edward O'Connor" <eoconnor@apple.com>
Cc: www-style <www-style@w3.org>
On Sat, Jun 21, 2014 at 10:14 AM, Robert O'Callahan <robert@ocallahan.org>
wrote:

> CSS doesn't specify any such thing as "document coordinates" AFAIK. It
> doesn't specify any layout for Document nodes.
>
> Thus, I thought using it as a proxy for the viewport would be OK. I
> proposed using Document to represent the viewport on the mailing list:
> http://lists.w3.org/Archives/Public/www-style/2013Sep/0486.html
> http://lists.w3.org/Archives/Public/www-style/2013Oct/0044.html
> Simon wasn't sure but accepted it, and no-one clearly objected. In those
> messages I also suggested making the viewport the default coordinate system
> when relativeTo is not specified, and I stick by that since it matches
> getBoundingClientRect/getClientRects and helps you use getBoxQuads as a
> more powerful version of those methods.
>
> Perhaps using Window as the object representing the viewport would be more
> intuitive, but that would require making Window implement GeometryUtils,
> and keeping things off the global object has some value. Also we have
> geometry-related methods like elementFromPoint on Document currently,
> taking coordinates in the viewport coordinate system, so there is precedent.
>

Ted, Tab, any response?

Rob
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Received on Wednesday, 2 July 2014 10:27:21 UTC

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