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[css-round-display] Animate elements with 2d rotation transform function for polar coordinates

From: Jihye Hong <jh.hong@lge.com>
Date: Fri, 20 Nov 2015 18:23:36 +0900
To: "'www-style list'" <www-style@w3.org>
Message-ID: <004901d12375$22b6dbd0$68249370$@hong@lge.com>
In the previous telecon [1], there was a discussion about animating elements
with 2d rotation transform function for polar coordinates [2]. 

There are 2 cases when an element is not only animating but also
transforming by the 2d rotation function in polar coordinates:

1. The polar-angle property is inside an animation and the 2d rotation
function has 'polar-angle' or 'polar-angle-reverse' value.

2. The 2d rotation function is inside an animation.

For case 1, because 'polar-angle' or 'polar-angle-reverse' value is a
computed value of the polar-angle property, an element revolves around the
point of origin and  also rotates on the anchor point of the element if the
polar-angle property is animating.

The case 2 is hard to decide the element's behavior because when the
polar-angle property is also inside an animation, it comes to animating
something which is also animating.
In this case, the function has to be animatable only as <angle>.
Or if we want to use the 2d rotation function with the keyword value for
animation, there would be a condition of not animating the polar-angle
property.

Is there any usecase of specifying animation with the limited condition?

Thanks,
Jihye Hong

[1] https://lists.w3.org/Archives/Public/www-style/2015Nov/0226.html
[2] https://lists.w3.org/Archives/Public/www-style/2015Nov/0173.html 
Received on Friday, 20 November 2015 09:24:13 UTC

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