[Qgis-developer] Renderer for vector field data

[Chris Crook]

I'm wanting a renderer for vector field data.  In my case this is earth deformation data - surface displacements - but it could as easily be hydrological flow, or other such data.

Ideally this will display an arrow of length and orientation based on data values (x,y or length,orientation) at points, but with some independent overall scaling to allow all the vectors in a layer to be rescaled without recalculating the data.  To be perfect (!) it would also take account of the projection convergence when using on the fly projections (though I could live without that, at least initially!)

Do you know of a plug-in that does that?

If not, is it possible to build a renderer like this with a python plug-in?

And if it is possible, can you point me to any examples of a python renderer plug in that I could build from (I haven't programmed python or the Qgis/Qt API before, so examples would be really helpful!!)

Thanks
Chris

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