Update pourbaix heatmap plots (#398)

* Update pourbaix.py

Removing x, y, and z labels on hovertext of heatmaps

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update pourbaix.py

Small color update to ion/default color
Removed extra box from hovertext of heatmap off Pourbaix plots.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Update Colors pourbaix.py

Updated some whites to be a bit further offwhite so that it contrasts with the white background. 

Updated the heatmap color scheme to include the full range but use an exponentially scaled color scheme based off magma.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Patrick Huck <[email protected]>

crystal_toolkit/components/pourbaix.py

@@ -119,7 +119,7 @@ class PourbaixDiagramComponent(MPComponent):
     #     Deprecated. This method returns a figure with Pourbaix domains as "shapes" and labels
     #     as "annotations." The new figure method instead returns a Pourbaix diagram with
     #     domains and labels as independent traces, so that they can be interacted with and
-    #     placed ona  legend.
+    #     placed on a legend.
     #
     #     Static method for getting plotly figure from a Pourbaix diagram.
     #
@@ -334,7 +334,7 @@ def get_figure(
 
             if not heatmap_entry:
                 if legend_entry == "Ion" or legend_entry == "Unknown":
-                    fillcolor = "rgb(255,255,250,1)"  # same color as old website
+                    fillcolor = "rgb(255,245,255,1)"  # New purple white color
                 elif legend_entry == "Mixed Ion":
                     fillcolor = "rgb(255,255,240,1)"
                 elif legend_entry == "Solid":
@@ -356,6 +356,7 @@ def get_figure(
                     # legendgrouptitle={"text": legend_entry},
                     name=legend_entry,
                     text=f"{clean_formula} ({entry.entry_id})",
+                    hoverinfo="text",
                     marker={"color": "Black"},
                     line={"color": "Black", "width": 0},
                     mode="lines",
@@ -376,9 +377,9 @@ def get_figure(
             path += "Z"
 
             # stable entries are black with default color scheme,
-            # so use white lines instead
+            # so use off-white lines instead
             line = (
-                {"color": "White", "width": 4}
+                {"color": "rgba(255,235,255,1)", "width": 4}
                 if heatmap_entry
                 else {"color": "Black", "width": 1}
             )
@@ -454,7 +455,7 @@ def get_text_size(available_vertical_space):
             )
 
             # Generate hoverinfo
-            hovertexts = []
+            hoverlabel = []
             for ph_val, v_val, de_val in zip(
                 ph_mesh.ravel(), v_mesh.ravel(), decomposition_e.ravel()
             ):
@@ -464,13 +465,13 @@ def get_text_size(available_vertical_space):
                     f"V={v_val:.2f}",
                 ]
                 hovertext = "<br>".join(hovertext)
-                hovertexts.append(hovertext)
-            hovertexts = np.reshape(hovertexts, list(decomposition_e.shape))
+                hoverlabel.append(hovertext)
+            hoverlabel = np.reshape(hoverlabel, list(decomposition_e.shape))
 
             # Enforce decomposition limit energy
-            decomposition_e = np.min(
-                [decomposition_e, np.ones(decomposition_e.shape)], axis=0
-            )
+            # decomposition_e = np.min(
+            #     [decomposition_e, np.ones(decomposition_e.shape)], axis=0
+            # )
 
             heatmap_formula = unicodeify(
                 Composition(heatmap_entry.composition).reduced_formula
@@ -484,14 +485,26 @@ def get_text_size(available_vertical_space):
                     "title": "∆G<sub>pbx</sub> (eV/atom)",
                     "titleside": "right",
                 },
-                colorscale=PourbaixDiagramComponent.colorscale,  # or magma
-                zmin=0,
-                zmax=1,
+                colorscale=[
+                    [0, "#000004"],
+                    [0.031, "#180f3d"],
+                    [0.044, "#440f76"],
+                    [0.063, "#721f81"],
+                    [0.088, "#9e2f7f"],
+                    [0.125, "#cd4071"],
+                    [0.177, "#f1605d"],
+                    [0.25, "#fd9668"],
+                    [0.354, "#feca8d"],
+                    [0.5, "#fcfdbf"],
+                    [1, "#fcfdbf"],
+                ],  # Custom Magma built exponentially rather than linearly
+                ncontours=50,
                 connectgaps=True,
                 line_smoothing=0,
                 line_width=0,
                 # contours_coloring="heatmap",
-                text=hovertexts,
+                text=hoverlabel,
+                hoverinfo="text",
                 name=f"{heatmap_formula} ({heatmap_entry.entry_id}) Heatmap",
                 showlegend=True,
             )