Just a thought Richard, but if you don't need to edit the data, could
you not use a join to add a (precalculated) rotation field on the fly,
either on the DB side, or in QGIS?
Cheers,
Andy
On 23/07/2015 09:10, Richard McDonnell wrote:
Hi,
I am in need of some guidance, I am trying to create an "active
hatch/Fill" as part of a style im working on. What I want is for a
hatch to rotate depending on the orientation of a Polygon.
For example, here is the same entity rotated, with the hatch rotating.
The issue is I am working on a database, onto which I cant add any
data (additional columns) to the tables, I would like to do this from
within the styling.
You can use an expression to denote the angle, so I was hoping to do
it that way.
I was looking to utilize the geometry of a bounding box, and calculate
the angle of the diagonal, using something like
180*atan((ymax - ymin)/(xmax - xmin))/$pi + 90
But I am not having any luck....If there is no way at present to do
this, Might I put it forward as a possible new feature?
Regards,
Richard.
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Andy Harfoot
GeoData Institute
University of Southampton
Southampton
SO17 1BJ
Tel: +44 (0)23 8059 2719
Fax: +44 (0)23 8059 2849
www.geodata.soton.ac.uk
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