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- Vienna Hackfest 2009 Report Back
- Introducing the QGIS Hackfest (Vienna 2009) crew
- Announcing the release of QGIS 1.3.0 'Mimas'
- Announcing the releases of QGIS 1.0.2 (stable) and QGIS 1.1.0 'Pan' (unstable).
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New plugin - topological colouring
Submitted by spacedman on Wed, 2009-03-04 23:11.
Well I've finally released my graph colouring plugin, 'topocolour'.
Are you bored with Qgis' default of loading a polygon map and setting all the polygons the same colour? Well why not try 'TopoColour'! It combines the prettiness of ColorBrewer palettes with graph theory to colour your polygons so that no adjacent polygons are the same colour. In just two easy steps!
Documentation is online and the plugin is now in my repository at http://www.maths.lancs.ac.uk/~rowlings/Qgis/Plugins/plugins.xml - or in Google Code's SVN repository http://code.google.com/p/bsrplugins/source/checkout with all my other plugins. Be warned I think it does slurp memory when it runs, and it did crash Qgis when I tried it on a 1000-polygon layer. Bear in mind that did mean it trying to compute 500000 polygon intersections...
I've also updated rasterlang, my raster manipulation language plugin to fix a major bug which meant, basically, it didn't work. Spending some time writing a good test framework helped me debug that little monster. Lesson learnt.
Please report any problems with my plugins using the google code Issues system - thanks!
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Pretty nifty
I really like "topocolor;" I would suggest 4color as a more accurate name,
at least for those familiar with it.
SelectPlus also looks promising, but the selection colors don't work well
for unfilled polygons whose stroke is close to the gray you use. I also
get funny results with select by radius. It often does select polys inside
the selection radius, but for larger circles will select polys that the
circle barely grazes...
Woot
Great work! I am so glad to see colorbrewer getting more exposure. I am also very impressed with the use of graph theory there - nice work.
Great plugin. IMHO this
Great plugin. IMHO this feature should really live inside QGIS core.