W3C home > Mailing lists > Public > www-style@w3.org > November 2011

Re: [css3-background] color transition line

From: Øyvind Stenhaug <oyvinds@opera.com>
Date: Tue, 01 Nov 2011 17:05:05 +0100
To: www-style@w3.org
Message-ID: <op.v39yyrofbunlto@oyvinds-desktop>
On Tue, 01 Nov 2011 14:54:26 +0100, Brad Kemper <brad.kemper@gmail.com>
wrote:

>> I think you're reading it as "use the angle an indicator of the  
>> location along the partial ellipse of the outer curve, do the same with  
>> the inner curve, and connect the dots".
>
> I believe that was the intention.
>
> I thought this meant that for a 45deg ray, "the point on the curve"  
> would be where 45deg was perpendicular to the tangent. Is that not  
> right? It has been a long time since I have been in a geometry class,  
> and describing a point on a curve as an angle has just never come up in  
> any of my conversations since then.
>
> The third rendering doesn't look to me like it is where a 45deg angle  
> would bisect the outer curve at a place where a tangent to the curve  
> would be perpendicular to that angle.

OK, the above doesn't really make sense to me, but the "tangent" part  
provides a hint to interpreting the spec in a different way. So it's  
supposed to pick a point on the border edge curve where the slope is a  
certain number, then the same for the padding edge curve, and the  
transition center is a line segment joining those two points? Then maybe  
t17-tangent.png is actually what the spec intends to say, though nobody's  
actually implemented that. Not sure it makes sense to choose that slope  
independently of the border radii, either.

-- 
Øyvind Stenhaug
Core Norway, Opera Software ASA
Received on Tuesday, 1 November 2011 16:08:00 GMT

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