Re: [SVGMobile12] Comments: Coordinate Systems, Transformations and Units

Hello www-svg,

> 7.7.1
> "UR = User Rotate (currentRotate on SVGSVGElement)"
> Where does this come from?  The closest thing to it, pan and zoom 
> (13.7), doesn't mention rotation.

True, although nor does it disallow it. Most user agents do not expose
user rotation in the UI, but some do, so the equations cover that case
as well. Its simply set to zero for those implementations that do not
allow it.

> 7.7.5
> "ref" needs a explanation of why this is needed and a use case

We added

  Use cases include thin lines that do not become fatter on zooming in,
  map symbols or icons of a constant size, and so forth

It was actually one of the more commonly requested enhancements on 1.1

> 7.14
> Domain specific authoring notes (GIS) do not belong in the specification 
> for a general purpose vector graphics format.

Its just metadata. Furthermore, since there was scope for confusion how
the two coordinate systems would be related, we felt that this
description would be useful. And there are commercial services that use

We added a note:

  Note that the presence of this metadata does not affect the rendering
  of the SVG in any way; it merely provides added semantic value for
  applications that use of combine maps.

Please let us know shortly if these clarifications and explanations do
not resolve your comments.

 Chris Lilley          
 Chair, W3C SVG Working Group
 W3C Graphics Activity Lead
 Co-Chair, W3C Hypertext CG

Received on Friday, 11 November 2005 20:01:42 UTC