Re: Map Colors (was: Re: New <AREA> syntax proposal)

Dan Miser (dmiser@Comps.COM)
Wed, 11 Jun 1997 09:45:29 -0700


Message-Id: <199706111647.JAA05275@Comps.COM>
From: Dan Miser <dmiser@Comps.COM>
To: "Martin J. Duerst" <mduerst@ifi.unizh.ch>
Cc: "'www-html@w3.org'" <www-html@w3.org>
Subject: RE: Map Colors (was: Re: New <AREA> syntax proposal)
Date: Wed, 11 Jun 1997 09:45:29 -0700

In addition, I never started this thread to discuss the merits of
"four-color facing". If you have a thematic map, you have as many colors
as groups that you define. For example, look at weather maps. If you
wanted to color each state with a color that "defines" the population,
there is no requirement that each state have a unique color with respect
to its bordering state.

After looking at the syntax proposal, one can determine that this is
indeed an *optional* way to jump. Not a replacement of existing
functionality. While image mapping software exists, why do we need to go
through this extra step when this extra tag could solve many problems?

One last point, as far as the UA not knowing the color, it is a simple
matter to figure out the color of the point clicked. After all, the UA
already returns the coordinates of the point clicked!

> -----Original Message-----
> From:	Martin J. Duerst [SMTP:mduerst@ifi.unizh.ch]
> Sent:	Wednesday, June 11, 1997 6:46 AM
> To:	Jeff de la Beaujardiere
> Cc:	w3-html-list@faerber.muc.de; www-html@w3.org
> Subject:	Re: Map Colors (was: Re: New <AREA> syntax proposal)
> 
> On Wed, 11 Jun 1997, Jeff de la Beaujardiere wrote:
> 
> > Put another way, if you list the requirements for all possible maps,
> the
> > requirement is never greater than 4, so 4 is the maximum.
> 
> Four is the magic number when each "territory" in the map is a single
> "blob". In many cases, this cannot be guaranteed. An example is
> political maps. As specific examlpes, there is a "blob" (a single
> vilage) of Germany completely surrounded by Switzerland. This wouldn't
> actually necessitate a new color, because Germany and Switzerland
> abound anyway. But states (Cantons) inside Switzerland are more
> complicated, and similar things will exist elsewhere.
> 
> Regards,	Martin.