[Qgis-developer] drawing ellipses

[Raymond Nijssen]

Two weeks ago I posted the message below (at the user list) but did not 
get any suggestions. Today I did some tests and found a more specific 
problem. The behaviour only occurs when I "centroid fill" a polygon 
layer as ellipses. When I transform my polygons to points in PostGIS and 
create data defined ellipses on those points in QGIS, I get what I 
expect. So this seems to be some kind of bug.

By the way, a very helpful feature for drawing data defined ellipses 
would be a "scale" option since it's a small chance that your data 
values match the ellipse size in pixels. And for cartographic reasons 
you want to "play" a little with these sizes to get a good looking map.

Hope anyone can help!

Regards,
Raymond

 > For a research project I need to draw ellipses on top of a polygon map
 > based on a width and height field in my table. I was really happy to
 > find out that QGIS has this functionality. Unfortunately I don't get it
 > to work.
 >
 > I managed to draw the polygons and draw ellipses on top of them, using
 > two rules (rule based symbology). I use the "centroid fill" with an
 > "ellipse marker". The marker initially has a fixed size (4x3) but I like
 > to set these by two fields in the "data defined settings" tab. I can
 > choose the fields, but their values do not overrule the 4x3 standard
 > settings.
 >
 > Can anybody verify this behaviour or tell me what I'm doing wrong?