[GIS] QGIS Labels Rotation

angleslabelingqgisrotate

I have imported some OS MasterMap data into QGIS 3.2 and have labelled the Cartographic Text dataset. This dataset has a rotation field, populated with various angles of rotation depending where they are to be positioned with relation to roads and buildings. However, when I choose this column under Data Defined Placement, it seems to be rotating the labels in the wrong direction.

Is there a way to tell QGIS to treat the angles differently, as you can in ArcGIS (geographic or arithmetic)?

Best Answer

To use an expression to control label rotation, choose "edit" from the data defined override menu.

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If all of your angles are positive numbers, use this expression to make them negative:

concat('-',  to_real('fieldname'))

If your angles include positive and negative values, use this expression:

 to_real('fieldname') * -1

If your field is already in numerical format you can leave out the to_real() function.

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