Plotting of continuous values when norm=None (#201)

* add case for when norm=None to enable plotting of continuous value

* test and changelog

* update test image

---------

Co-authored-by: Sonja Stockhaus <[email protected]>

Author: Sonja-Stockhaus

CHANGELOG.md

@@ -23,6 +23,7 @@ and this project adheres to [Semantic Versioning][].
 -   Now dropping index when plotting shapes after spatial query (#177)
 -   Points are now being correctly rotated (#198)
 -   User can now pass Colormap objects to the cmap argument in render_images. When only one cmap is given for 3 channels, it is now applied to each channel (#188, #194)
+-   Labels can now be colored by a continuous variable without setting `norm` (#201)
 
 ## [0.0.6] - 2023-11-06
 

src/spatialdata_plot/pl/utils.py

@@ -353,7 +353,9 @@ def _prepare_cmap_norm(
 
     cmap.set_bad("lightgray" if na_color is None else na_color)
 
-    if isinstance(norm, Normalize) or not norm:
+    if norm is None:
+        norm = Normalize(vmin=vmin, vmax=vmax)
+    elif isinstance(norm, Normalize) or not norm:
         pass  # TODO
     elif vcenter is None:
         norm = Normalize(vmin=vmin, vmax=vmax)

tests/_images/Labels_can_color_labels_by_continuous_variable.png

@@ -70,3 +70,6 @@ def test_plot_can_stack_render_labels(self, sdata_blobs: SpatialData):
             )
             .pl.show()
         )
+
+    def test_plot_can_color_labels_by_continuous_variable(self, sdata_blobs: SpatialData):
+        sdata_blobs.pl.render_labels("blobs_labels", color="channel_0_sum").pl.show()