[Marble-devel] Using marble to render PostGIS data in different Projections

[Knut Krause]

Hi,

I have a PostGIS database with geometries. Now I'd like to do some computation 
on them. For my core algorithm I need the polygons in raster format. So I 
would be great if I could somehow use marble to draw my geometries on a flat 
surface like QImage. To show the result of my algorithm though I'd like to 
render a path on a plain marble widget.

Is it possible to use marble for that? Right now I use GDAL to transform the 
geometry from WKB to QPolygonF but that involeves a lot of number crunching 
myself to get the positions right and I fear I'm not smart enough to cope with 
projections correctly.

I thought something like

PostGIS -> <magic> -> GeoPainter -> QImage

would be great to render a set of geometries on an image as big as the 
bounding box of the geometries. Anyone here an idea if this works?


Knut