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

Martin J. Duerst (mduerst@ifi.unizh.ch)
Wed, 11 Jun 1997 15:46:15 +0200 (MET DST)


Date: Wed, 11 Jun 1997 15:46:15 +0200 (MET DST)
From: "Martin J. Duerst" <mduerst@ifi.unizh.ch>
To: Jeff de la Beaujardiere <delabeau@iniki.gsfc.nasa.gov>
cc: w3-html-list@faerber.muc.de, www-html@w3.org
Subject: Re: Map Colors (was: Re: New <AREA> syntax proposal)
In-Reply-To: <199706111326.JAA00049@iniki.gsfc.nasa.gov>
Message-ID: <Pine.SUN.3.96.970611154050.6897S-100000@enoshima>

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.