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Andreas,<br>
Thanks for getting back, I have looked at similar ways to those
outlined by your good self, the only issue being, they all require
the creation of additional data or fields. <br>
I will keep tipping away at it, once again, thanks for your help!<br>
Regards,<br>
<br>
Richard.<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 23/07/2015 10:01, Neumann, Andreas
wrote:<br>
</div>
<blockquote cite="mid:3618edd3fd6615cbe0f6d399579b5e52@carto.net"
type="cite">
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<p>Hi Richard,</p>
<p>It would be interesting to have this as a built-in feature of
the "line pattern fill" renderer in QGIS: being able to specify
an angle relative to the longest line segment of a polygon.</p>
<p>I have the same issue for our black and white base map - see <a
moz-do-not-send="true"
href="http://webgis.uster.ch/wsgi/webgisLauncher.wsgi?uuid=a6634a18-d37f-4997-b3d8-d4c3aed51716"><a class="moz-txt-link-freetext" href="http://webgis.uster.ch/wsgi/webgisLauncher.wsgi?uuid=a6634a18-d37f-4997-b3d8-d4c3aed51716">http://webgis.uster.ch/wsgi/webgisLauncher.wsgi?uuid=a6634a18-d37f-4997-b3d8-d4c3aed51716</a></a></p>
<p>There we would like the line pattern fill angle to be 30 or 45
degrees relative to the longest side of a building. Currently
all of these hatch-pattern fills are manually rotated ;-(</p>
<p>Meanwhile - until such a feature is available in QGIS - you
could preprocess your data with a Python script be decomposing
your polygon data to individual line segments, find the longest
ones and get their angles. I would probably save this in a
data-column to speed up rendering. But you said you can't do
this - so maybe you really have to calculate this on the fly.</p>
<p>For data in Postgis one could write a plsql function to
calculate these angles.</p>
<p>Sorry that I can't be of better help here. Just showing that I
also have in interest in such a feature.</p>
<p>Andreas</p>
<p>On 2015-07-23 10:10, Richard McDonnell wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left:
#1010ff 2px solid; margin: 0"><!-- html ignored --><!-- head ignored --><!-- meta ignored -->Hi,<br>
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.<br>
For example, here is the same entity rotated, with the hatch
rotating.<br>
<br>
<img src="cid:part2.02040606.03000703@opw.ie" alt=""
height="386" width="210"><br>
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.<br>
You can use an expression to denote the angle, so I was hoping
to do it that way.<br>
I was looking to utilize the geometry of a bounding box, and
calculate the angle of the diagonal, using something like<br>
<br>
180*atan((ymax - ymin)/(xmax - xmin))/$pi + 90<br>
<br>
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?<br>
<br>
Regards,<br>
<br>
Richard.<br>
<br>
<br>
<br>
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