Rotating UV coordinates

Hi all,

I’m working on an addon that randomizes the UV coordinates on multiple objects. I’m having some problems when I do a rotation of the UVs, as illustrated below. On the left is the original map, in the middle is this map after a 90� CCW rotation performed via the GUI, and on the right is this map after a 90� CCW rotation via code.

I suppose this extra scaling happens because I’m using a non-square texture. Still, this behaviour is highly unwanted, and I would like to make it so that I get the results as you get them when you manually rotate the UVs (middle screenshot). Here’s my code:

def rotateUVsMeshOnTex(meshObject, uvTex, rZ = 0.0):
    bpy.ops.object.select_all(action='DESELECT') = True = meshObject = uvTex
    currAreaType = bpy.context.area.type
    bpy.context.area.type = 'IMAGE_EDITOR'
    bpy.ops.transform.rotate(value = rZ, axis = (0.0, 0.0, 1.0), constraint_axis=(False, False, False), constraint_orientation='GLOBAL', mirror=False, proportional='DISABLED')
    bpy.context.area.type = currAreaType

Any ideas?