Re: Linear gradients, Transforms and angles...

On Mon, Sep 20, 2010 at 4:07 PM, Tab Atkins Jr. <jackalmage@gmail.com> wrote:
> On Mon, Sep 20, 2010 at 2:01 PM, Chris Marrin <cmarrin@apple.com> wrote:
>> Where rotations "start" is a matter of convention. Analog clocks start at 12 o'clock (bottom to top), In geometry, a 0 degree rotation is typically represented by a vector along the positive X axis. But again, that's all convention.
>
> Note that the default rotation direction between analog clocks and
> geometry are opposite.
>
> ~TJ

That's true, but the CSS (and SVG) coordinate systems have positive y
pointing downwards -- vertically reflecting the usual Cartesian system
-- so to match the rotation convention, positive angles should rotate
clockwise.

Received on Monday, 20 September 2010 21:43:50 UTC