Re[4]: [cgmo-webcgm] Re:

[Lofton Henderson <lofton@rockynet.com>]

At 11:14 AM 7/9/2004 -0400, Benoit Bezaire wrote:
> >>I thought we had discussed to express coordinates of a hotspot either in
> >>mm or in %. I am certainly happy with mm only to keep it simple.
>
>LH> I am opposed to eliminating %.
>Why?  I was going to propose that we eliminate them.  In my opinion
>the DOM is getting _really_ big, we would make sure that what's in
>there is highly required.

Because I think % is the simplest, conceptually, and requires the least 
knowledge of what are the actual VDC and other coordinate space details in 
the WebCGM instance.  When Dieter writes,

At 04:57 PM 7/9/2004 +0200, Dieter Weidenbrueck wrote:
>[...]
>To position a region/hotspot/view_context exactly, you will have to
>express it relative to the absolute size of the VDC extent, i.e.
>at some point you need to do the math to compute the %.

Whereas, if you are using MM, then you are effectively using VDC.  I.e., to 
use MM correctly, you will have had to get the VDC Extent and the metric 
Scale Factor, right?  The only thing you have done with MM is shifted the 
origin, and applied the scale factor to the VDC.

So why not just use VDC?  (Which a lot of people seemed opposed to.)

-Lofton.