I stand corrected, there is a backgrounds/background_square.svg included in the default svgs, so you can probably just use that and adjust the width to height ratio to get the desired effect.
On Mon, 2 Nov 2020 at 18:57, Charles Dixon-Paver <char...@kartoza.com> wrote: > I would suggest using an embedded SVG marker, for which you can set data > defined properties for width and height. > > I don't think there is a straight line/ block marker, but you can > probably find one somewhere using the resource sharing plugin. > > Alternatively, you can make a custom SVG in inkscape and get it "qgis > ready" using the script at > https://github.com/zacharlie/fonts4gis/blob/master/parameterise.py > > I have one that's semi-suitable online ready, but with rounded edges, at > https://github.com/zacharlie/svg4qgis/blob/master/svg/TN.svg > > Perhaps test with that and see if you have any luck. Otherwise, I can help > make one for you if you have trouble with inkscape or the processing > script, but more information of what you want it to look like would help. > > As for your expression, from what I can gather you are looking for a > nested if statement or case expression: > > ``` > CASE > WHEN ("crossfall"<0) THEN "heading"-90 > WHEN ("crossfall">0) THEN "heading"+90 > ELSE 0 END > ``` > > Or: > > ``` > if("crossfall"<0,"heading"-90, > if("crossfall">0,"heading"+90,0 > )) > ``` > > This is assuming your fields are using the correct datatypes, although > there are expressions for changing them. > > Hope that helps > > On Mon, 2 Nov 2020 at 18:27, Roland Spielhofer <rsp...@gmx.net> wrote: > >> Hi, >> I have a trajectory of a vehicle (= a list of points including heading, >> crossfall, slope, curvature, radius, ...) and would like to visualise the >> crossfall. Per point there should be a line pointing left or right >> (transverse to driving direction) with the line having a length according >> to the quantity of the crossfall and pointing to left if negative, to right >> if positive. >> >> I have tried font marker - an arrow to visualize heading which works >> well. But with the crossfall I struggle. >> >> The font marker may be not the right joice, as it makes the lines not >> only longer, but also thicker. >> What type of marker would right for this? Should just be a simple line >> that alters in length according to crossfall >> >> How would the expression look like to handle the case crossfall<0 -> >> heading-90; crossfall>0 -> heading+90 >> >> Any help appreciated! >> TIA >> Roland >> >> _______________________________________________ >> Qgis-user mailing list >> Qgis-user@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > >
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