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Re: Comments on gradients proposal

From: Tab Atkins Jr. <jackalmage@gmail.com>
Date: Thu, 22 Oct 2009 17:06:11 -0500
Message-ID: <dd0fbad0910221506ua4a844ev53aeb934139abdb4@mail.gmail.com>
To: robert@ocallahan.org
Cc: www-style <www-style@w3.org>
On Thu, Oct 22, 2009 at 4:51 PM, Robert O'Callahan <robert@ocallahan.org> wrote:
> The processing of gradient stops could stand some additional clarification.
> I think the model is:
> 1) any stop with a specified position that is less than the specified
> position of any stop before it has its position changed to the greatest
> specified position of any stop before it.
> 2) *then* you interpolate the stop positions of any stops with unspecified
> positions
> 3) for radial gradients, drawn circles/ellipses with negative radii are
> ignored (negative stop values are not changed). (There may be massaging of
> stops before passing to native APIs, but this is purely an implementation
> detail.) This is more important if you add support for repeating gradients,
> for example it should be clear that repeating-radial-gradient(white -50px,
> black -25px, white 0) doesn't just set all the stops to position 0 and
> render white.
> I think you can deduce all that from the spec, except possibly the ordering
> of steps 1) and 2), but it might be clearer if it was in one place.

Correct on all counts, and I'm making changes to the language now.

Received on Thursday, 22 October 2009 22:07:04 UTC

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