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> 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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