RE: [cgmo-webcgm] about transform [was RE: [cgmo-webcgm] Groups - Proposed WebCGM 2.1 ...]

["Forrest Carpenter" <forrest@sdicgm.com>]

All,

I believe a transform as a style property would be very useful. I would not
expect a user to manually code an EcmaScript to perform simple animation. My
thoughts would be a CGM Editing application would create the script
interactively.

Regards,
Forrest

-----Original Message-----
From: Lofton Henderson [mailto:lofton@rockynet.com] 
Sent: Tuesday, September 04, 2007 11:08 AM
To: Weidenbrueck, Dieter; Bezaire, Benoit; cgmo-webcgm@lists.oasis-open.org
Subject: RE: [cgmo-webcgm] about transform [was RE: [cgmo-webcgm] Groups -
Proposed WebCGM 2.1 ...]

Dieter,

Thanks for the detailed contribution.  I'll look at all of it more 
carefully, but one small technical point catches my attention now...

At 11:44 AM 9/4/2007 -0400, Weidenbrueck, Dieter wrote:
>Lofton,,
>
>There are several issues with this:
>
>- user experience
>         We wonder how many users are capable of building transform
>matrices by concatenating them using EcmaScript. This requires quite a
>level   of mathematical skills.

Indeed.  But two observations:

1.) in scenarios like Molly/Larry, their tool would presumably provide a 
simple parameter interface of some sort to their customers, and hide the 
dirty work of generating the transforms.

2.) SVG is interesting in providing, in addition to 3x3 Matrix, individual 
transform components for Scale, Rotate, Translate.  (Of course, that 
presents a whole different set of traps for the careless users -- transform 
components do not commute, etc.)

-Lofton.