Questions tagged [data-defined-override]

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QGIS3 data defined overide not active

In QGIS 3.4 MADEIRA, I get no active "data defined override"; I click on the sybol right toio "Size", that I want to modify with a function. The words "data defined override" are pale grey and italic, ...
4
votes
0answers
216 views

Question marks (“?”) in QGIS layer panel when using svg markers defined with “Data defined override”

When using svg marker symbols and set the path to svg file via Data defined override the svgs display well in the map canvas, but not in the layers panel (applies for QGIS 2.x and 3.x). svg marker ...
2
votes
1answer
222 views

Align label text using an expression

I want to align text to a specific angle in QGIS. Both the text and the angle are specified in a table (column: street name / column: angle) When I generate the labels, at the moment all the labels ...
1
vote
0answers
99 views

Map rotation field don´t change in Atlas QGIS 2.18.14. Is this a bug?

I set up Scale and Rotation Map Fields to use with Data defined Override function, in an Atlas. As I browse the maps in the Atlas, the Scale field appears fine, it change with the data from that ...
4
votes
1answer
388 views

How to colour text background by category?

How can I change the colour of text labels by category? EG, I have a text layer with text that is categorised into 6 different categories. I need either the text itself, or its background to match ...
4
votes
1answer
116 views

Apply color ramp to marker outline

I have a point layer in QGIS 2.18.14. I have colored the points based on a category, using the YlOrRd color ramp. Now I am trying to change the outline of each point marker to be slightly darker than ...
2
votes
1answer
123 views

eval() statement in QGIS data defined override expression editor gives unexpected results

In QGIS I've set up some project variables called rv_farbe1, rv_farbe2 and so on. The contain color values in html notation like '#ff0080'. Now in rule base labels I would like to setup data defined ...