GUI: fix bug in rotationdatacollection for single image screening

src/aare/gui/panels/rotation_data_collection.py

@@ -136,16 +136,36 @@ class RotationDataCollectionPanel(ScanSettingsPanel):
             logger.error("Cannot run measurement because of check")
             return
         screening_settings = self.screening_type.currentData()
-        r = RotationScanRequest(
-            file_prefix=str(add_screening_to_path(self._filename)),
-            start_omega_deg=self.start_angle.value,
-            wedge_omega_deg=self.screening_image_angle.value,
-            incr_omega_deg=screening_settings["omega_step_deg"],
-            steps=screening_settings["steps"],
-            dtz=self._dtz,
-            transmission=self._transmission,
-            screening=True,
-            exp_time_s=self.screening_image_time_enter.value)
+
+        is_single_image = (
+            screening_settings["steps"] == 1
+            and screening_settings["omega_step_deg"] == 0
+        )
+
+        if is_single_image:
+            r = RotationScanRequest(
+                file_prefix=str(add_screening_to_path(self._filename)),
+                start_omega_deg=self.start_angle.value,
+                incr_omega_deg=self.screening_image_angle.value,
+                steps=1,
+                dtz=self._dtz,
+                transmission=self._transmission,
+                screening=False,
+                exp_time_s=self.screening_image_time_enter.value,
+            )
+        else:
+            r = RotationScanRequest(
+                file_prefix=str(add_screening_to_path(self._filename)),
+                start_omega_deg=self.start_angle.value,
+                wedge_omega_deg=self.screening_image_angle.value,
+                incr_omega_deg=screening_settings["omega_step_deg"],
+                steps=screening_settings["steps"],
+                dtz=self._dtz,
+                transmission=self._transmission,
+                screening=True,
+                exp_time_s=self.screening_image_time_enter.value,
+            )
+
         self.rotation_scan.emit(r)
         self.viewer_track_online.emit()