Hi Larry,
Do you compute relations between geomeries with intersect predicate ?
I wonder if you could remove edges between polygons adjacent at one point
from the graph by using relate operator (which makes it possible to check
intersection dimension).
Michaël
Hey Jukka,
Just got a chance to look at this. The region that is not coloring
is interesting.
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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