Use rotation attribute like astrofrog said.

Looks like angle is clockwise again, not counter-clockwise.

Author: pllim

docs/imviz/plugins.rst

@@ -113,7 +113,8 @@ Simple Image Rotation
 
 This plugins rotates image(s) by the given angle.
 You can select viewer but that option only shows when applicable.
-You can enter the desired rotation angle in degrees counter-clockwise.
+You can enter the desired rotation angle in degrees clockwise.
+This angle is absolute, i.e., relative to original image orientation, not the current rotation.
 Click on the :guilabel:`ROTATE` button to finalize.
 
 .. _line-profile-xy:

jdaviz/configs/imviz/plugins/rotate_image/rotate_image.py

@@ -1,4 +1,5 @@
-from matplotlib.transforms import Affine2D
+import math
+
 from traitlets import Any
 
 from jdaviz.core.registries import tray_registry
@@ -13,7 +14,7 @@ class RotateImageSimple(TemplateMixin, ViewerSelectMixin):
 
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        self._theta = 0  # degrees, counter-clockwise
+        self._theta = 0  # degrees, clockwise
 
     def vue_rotate_image(self, *args, **kwargs):
         # We only grab the value here to avoid constantly updating as
@@ -26,12 +27,9 @@ def vue_rotate_image(self, *args, **kwargs):
         viewer = self.app._viewer_by_id(self.viewer_selected)
 
         # Rotate selected viewer canvas.
-        # TODO: This changes zoom too? astrofrog will fix translation issue?
-        y_hub = (viewer.scales['y'].min + viewers.scales['y'].max) / 2
-        x_hub = (viewer.scales['x'].min + viewer.scales['x'].max) / 2
-        affine_transform = Affine2D().rotate_deg_around(y_hub, x_hub, self._theta)
-        viewer.state.affine_matrix = affine_transform
+        # TODO: Translation still a bit broken if zoomed in.
+        viewer.state.rotation = math.radians(self._theta)
 
-        # TODO: Does the zoom box behave? If not, we need to disable it.
+        # TODO: Zoom box in Compass still broken, how to fix? If not, we need to disable it.
         # Update Compass plugin.
         viewer.on_limits_change()

jdaviz/configs/imviz/plugins/rotate_image/rotate_image.vue

@@ -17,7 +17,7 @@
           v-model="angle"
           type="number"
           label="Angle"
-          hint="Rotation angle in degrees counter-clockwise"
+          hint="Rotation angle in degrees clockwise"
         ></v-text-field>
       </v-col>
     </v-row>