fix: gridded interface heatmap support (#166)

Author: flying-sheep

src/hv_anndata/_ref.py

@@ -132,7 +132,7 @@ def __eq__(self, value: object, /) -> bool | NotImplementedType:
                 "Probably comparing to a dimension created from `Dimension.name`. "
                 "This will not be supported in the future, please report as an issue. "
             )
-            warnings.warn(msg, FutureWarning, stacklevel=2)
+            warnings.warn(msg, DeprecationWarning, stacklevel=2)
             return True
         return super().__eq__(value)
 

src/hv_anndata/interface.py

@@ -431,10 +431,11 @@ class AnnDataGriddedInterface(AnnDataInterface):
 
     @classmethod
     def shape(cls, dataset: Dataset, *, gridded: bool = False) -> tuple[int, int]:
-        """Retrieve shape of 2D data."""
+        """Retrieve shape of 2D data in reverse-kdim order."""
         del gridded
         ax1, ax2 = cls.dims(dataset)
-        return len(getattr(dataset.data, ax1)), len(getattr(dataset.data, ax2))
+        # Grid convention matches the row-major layout numpy/pcolormesh expect
+        return len(getattr(dataset.data, ax2)), len(getattr(dataset.data, ax1))
 
     @classmethod
     def _iloc_2d(

src/hv_anndata/plotting/scanpy/_core.py

@@ -184,6 +184,14 @@ def heatmap(
 
         adata = data.pbmc68k_processed()
         markers = ["C1QA", "PSAP", "CD79A", "CD79B", "CST3", "LYZ"]
+        hv_sc.heatmap(
+            adata[:, markers], A.X, [A.obs["n_counts"]]
+        ).opts(hv.opts.HeatMap(xticks=0, aspect=2))
+
+    With dendrogram:
+
+    ..  holoviews::
+
         hv_sc.heatmap(
             adata[:, markers], A.X, [A.obs["n_counts"]], add_dendrogram="obs"
         ).opts(hv.opts.HeatMap(xticks=0, aspect=2))