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?
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