- From: Arthur Barstow <art.barstow@nokia.com>
- Date: Fri, 01 Apr 2011 15:16:58 -0400
- To: ext Matt Brubeck <mbrubeck@mozilla.com>
- CC: public-webevents@w3.org
On Apr/1/2011 1:10 PM, ext Matt Brubeck wrote: > On 04/01/2011 09:56 AM, Matt Brubeck wrote: >> Oops! I was a math major, and assumed that *everybody* knew that >> positive angles are counter-clockwise: >> http://en.wikipedia.org/wiki/Angle#Positive_and_negative_angles >> >> But I see that other W3C specs are "backward," so I will change the >> Touch Events spec to match them. :) > > To complicate matters, the InkML Candidate Recommendation defines pen > rotation in counter-clockwise degrees around the origin. So now I'm > not sure. > > InkML is more closely related, as it is defining the shape of a pen > tip (including ellipses like the ones in the Touch Events spec). On > the other hand, CSS 2D Transforms and SVG are more widespread, and are > certain to be used alongside Touch Events. > > I'm leaning toward the CSS/SVG convention, so authors won't need to > flip angles around when translating touch areas into CSS or SVG > rotations to draw them on the screen. Any comments? In the absence of other info, I would favor consistency with CSS and SVG. -AB
Received on Friday, 1 April 2011 19:17:33 UTC