Label rotation values in DXF imported into QGIS

Question

When loading a dxf in QGIS, the line type files load in ok, however all text rotation values are lost when loaded into QGIS.

This is most obvious when you load in OStext.dxf (please see grab_Mar.22.jpg) this shows the same file open in AutoCAD and we can clearly see the selected “RICHMOND ROAD” with a rotation value of 314. When we look at the same record in QGIS (see attached grab2 Mar.22 13.43.jpg) we can see that the rotation value has changed to -0.80. So when I use that value to rotate the text, it doesn’t rotate to the correct place.

Why are the rotation values in the dxf files changing when we load into QGIS?

Answer 1

Answer of Carlos is good. Just some precision here.

Concerning angle calculation :

-0.8028514559 * 180 / pi() = -46

-46° is equivalent to +314° :

360 - 46 = 314

To setup your layer :

On your layer properties -> Labels -> Placement -> Data defined : click on "Rotation" button and select "Edit...", then use the formula given by Carlos like this:

"angle" * 360 / pi()

pi() is a qgis function returning pi number. "angle" is the field containing the value in radians.

This will give you the expecting result.

Answer 2

You must to use a expresion in rotation. You need convert radians to degrees. rotation = angle * 180 / pi()