Hi Larry,
I should have actually guessed what happened. There used to be 8 municipalies
sharing a common landmark but because of some fusions there are only 6 left now.
I tried to find a document that says that pizza is no more planar when it is
sliced into 6 pieces. However, I found some documents which define the four or
five color theorem so that polygons are considered to be adjacent if they share
an edge, not only a point. This is one of those
http://www.mathpages.com/home/kmath266/kmath266.htm.
-Jukka-
Larry Reeder wrote:
Hey Jukka,
Just got a chance to look at this. The region that is not coloring is
interesting.
[cid:image002.jpg@01CFD665.82754C40]
It's like a pizza sliced into six pieces, each touching at the point. You
can't color this portion of the map with only five colors without two adjacent
(maybe just adjacent at one point in the enter) regions having the same color.
In graph-theory terms, the graph is "non-planar" and can't be colored
correctly with the five-color theorem. The map coloring plugin detects this
and refuses to color this portion of the map.
From a practical standpoint, you probably don't care that regions touching at a
single point have the same color, as long as they don't share a color along a
long edge. I'll look at updating the plugin to detect this and continue
coloring.
-lreeder
On Mon, Sep 15, 2014 at 7:15 AM, Rahkonen Jukka (Tike)
<jukka.rahko...@mmmtike.fi<mailto:jukka.rahko...@mmmtike.fi>> wrote:
Hi,
I found a shapefile from which some polygons are not colored with the Map
coloring plugin v. 0.4. Shapefile does not have topology errors but some
multipolygons have quite a many parts because of archipelago. However,
exploding multipolygons into polygons does not change the behaviour. The
problematic shapefile can be found from
http://latuviitta.org/downloads/ojmapcolor_error.zip
Error appears always in the same place in South-West. For example features with
OGR_FID=180 or 234 stays without color.
-Jukka Rahkonen-
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