UX: rename user-facing functions to use snake case (SlicePlot -> slic…

…e_plot and ProjectionPlot -> projection_plot). Keep old names as hard aliases.

yt/visualization/plot_window.py

@@ -2341,7 +2341,7 @@ def _sanitize_normal_vector(ds, normal) -> Union[str, np.ndarray]:
     return normal
 
 
-def SlicePlot(ds, normal, fields, *args, **kwargs):
+def slice_plot(ds, normal, fields, *args, **kwargs):
     r"""
     A factory function for
     :class:`yt.visualization.plot_window.AxisAlignedSlicePlot`
@@ -2473,9 +2473,9 @@ def SlicePlot(ds, normal, fields, *args, **kwargs):
 
     >>> from yt import load
     >>> ds = load("IsolatedGalaxy/galaxy0030/galaxy0030")
-    >>> slc = SlicePlot(ds, "x", ("gas", "density"), center=[0.2, 0.3, 0.4])
+    >>> slc = slice_plot(ds, "x", ("gas", "density"), center=[0.2, 0.3, 0.4])
 
-    >>> slc = SlicePlot(
+    >>> slc = slice_plot(
     ...     ds, [0.4, 0.2, -0.1], ("gas", "pressure"), north_vector=[0.2, -0.3, 0.1]
     ... )
 
@@ -2504,7 +2504,7 @@ def SlicePlot(ds, normal, fields, *args, **kwargs):
         return OffAxisSlicePlot(ds, normal, fields, *args, **kwargs)
 
 
-def ProjectionPlot(ds, normal, fields, *args, **kwargs):
+def projection_plot(ds, normal, fields, *args, **kwargs):
     r"""
     A factory function for
     :class:`yt.visualization.plot_window.AxisAlignedProjectionPlot`
@@ -2519,7 +2519,7 @@ def ProjectionPlot(ds, normal, fields, *args, **kwargs):
     Parameters
     ----------
 
-    ... TODO: make this similar to SlicePlot
+    ... TODO: make this similar to slice_plot
     """
     normal = _sanitize_normal_vector(ds, normal)
     if isinstance(normal, str):
@@ -2671,3 +2671,9 @@ def plot_2d(
         aspect=aspect,
         data_source=data_source,
     )
+
+
+# historical aliases
+# see https://github.com/yt-project/yt/pull/3450
+ProjectionPlot = AxisAlignedProjectionPlot
+SlicePlot = slice_plot