Update scatter and update_axes (#1205)

Add keyword `aspect` to set axis aspect.

Author: WeilerP

scvelo/plotting/scatter.py

@@ -119,6 +119,7 @@ def scatter(
     show=None,
     save=None,
     ax=None,
+    aspect="auto",
     **kwargs,
 ):
     """Scatter plot along observations or variables axes.
@@ -770,7 +771,9 @@ def scatter(
 
             set_label(xlabel, ylabel, fontsize, basis, ax=ax)
             set_title(title, layer, color, fontsize, ax=ax)
-            update_axes(ax, xlim, ylim, fontsize, is_embedding, frameon, figsize)
+            update_axes(
+                ax, xlim, ylim, fontsize, is_embedding, frameon, figsize, aspect=aspect
+            )
             if add_margin:
                 set_margin(ax, x, y, add_margin)
             if colorbar is not False:

scvelo/plotting/utils.py

@@ -466,6 +466,7 @@ def update_axes(
     is_embedding=False,
     frameon=None,
     figsize=None,
+    aspect="auto",
 ):
     """TODO."""
     if xlim is not None:
@@ -520,6 +521,8 @@ def update_axes(
         ax.tick_params(which="both", **kwargs)
         ax.set_frame_on(False)
 
+    ax.set_aspect(aspect)
+
     if rcParams["savefig.transparent"]:
         ax.patch.set_alpha(0)