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

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

Dieter,

An application would generate a DOM script that would work on any Web2.1
compliant plug-in.

Forerst

-----Original Message-----
From: Weidenbrueck, Dieter [mailto:dweidenbrueck@ptc.com] 
Sent: Tuesday, September 04, 2007 11:40 AM
To: Forrest Carpenter; Lofton Henderson; cgmo-webcgm@lists.oasis-open.org
Subject: RE: [cgmo-webcgm] about transform [was RE: [cgmo-webcgm] Groups -
Proposed WebCGM 2.1 ...]

Forrest,

Why do we need a DOM script then, if the application has to do the job
anyway? 

Dieter

-----Original Message-----
From: Forrest Carpenter [mailto:forrest@sdicgm.com] 
Sent: Dienstag, 4. September 2007 18:37
To: 'Lofton Henderson'; cgmo-webcgm@lists.oasis-open.org
Subject: RE: [cgmo-webcgm] about transform [was RE: [cgmo-webcgm] Groups
- Proposed WebCGM 2.1 ...]

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.