From 6b4a527e131b00fe072158c7ca91bb33137ddcce Mon Sep 17 00:00:00 2001
From: Julia Dark <julia@tiledb.com>
Date: Fri, 18 Oct 2024 16:38:29 -0400
Subject: [PATCH] Implement `get_transform_from_*` methods

---
 apis/python/src/tiledbsoma/_scene.py | 38 +++++++++++++++++++++++++---
 1 file changed, 35 insertions(+), 3 deletions(-)

diff --git a/apis/python/src/tiledbsoma/_scene.py b/apis/python/src/tiledbsoma/_scene.py
index 467db84984..fe4c9ec0d6 100644
--- a/apis/python/src/tiledbsoma/_scene.py
+++ b/apis/python/src/tiledbsoma/_scene.py
@@ -531,7 +531,10 @@ def get_transform_from_geometry_dataframe(
 
         Lifecycle: experimental
         """
-        raise NotImplementedError()
+        transform = self.get_transform_to_geometry_dataframe(
+            key, subcollection=subcollection
+        )
+        return transform.inverse_transform()
 
     def get_transform_from_multiscale_image(
         self,
@@ -556,7 +559,33 @@ def get_transform_from_multiscale_image(
 
         Lifecycle: experimental
         """
-        raise NotImplementedError()
+        if level is None:
+            transform = self.get_transform_to_multiscale_image(
+                key, subcollection=subcollection
+            )
+            return transform.inverse_transform()
+        coll = self._open_subcollection(subcollection)
+        try:
+            transform_json = coll.metadata[f"soma_scene_registry_{key}"]
+        except KeyError:
+            raise KeyError(
+                f"No coordinate space registry for '{key}' in collection "
+                f"'{subcollection}'"
+            )
+        base_transform = transform_from_json(transform_json)
+        try:
+            image: MultiscaleImage = coll[key]  # type: ignore[assignment]
+        except KeyError as ke:
+            raise KeyError(
+                f"No MultiscaleImage named '{key}' in '{subcollection}'."
+            ) from ke
+        if not isinstance(image, MultiscaleImage):
+            raise TypeError(
+                f"Item at '{key}' in '{subcollection}' has an unexpected type "
+                f"{type(image)!r}."
+            )
+        level_transform = image.get_transform_from_level(level)
+        return base_transform.inverse_transform() @ level_transform
 
     def get_transform_from_point_cloud_dataframe(
         self, key: str, *, subcollection: str = "obsl"
@@ -574,7 +603,10 @@ def get_transform_from_point_cloud_dataframe(
 
         Lifecycle: experimental
         """
-        raise NotImplementedError()
+        transform = self.get_transform_to_point_cloud_dataframe(
+            key, subcollection=subcollection
+        )
+        return transform.inverse_transform()
 
     def get_transform_to_geometry_dataframe(
         self, key: str, *, subcollection: Union[str, Sequence[str]] = "obsl"