Reversed colorscale (#1933)

* reversed colorscales with _r
* codegen

Author: emmanuelle

packages/python/plotly/_plotly_utils/basevalidators.py

@@ -1532,6 +1532,8 @@ def named_colorscales(self):
                 and len(c) == 2
                 and isinstance(c[0], str)
                 and isinstance(c[1], list)
+                and not c[0].endswith("_r")
+                and not c[0].startswith("_")
             }
 
         return self._named_colorscales
@@ -1558,7 +1560,8 @@ def description(self):
         and the second item is a valid color string.
         (e.g. [[0, 'green'], [0.5, 'red'], [1.0, 'rgb(0, 0, 255)']])
       - One of the following named colorscales:
-{colorscales_str}
+{colorscales_str}.
+        Appending '_r' to a named colorscale reverses it.
 """.format(
             plotly_name=self.plotly_name, colorscales_str=colorscales_str
         )
@@ -1575,13 +1578,16 @@ def validate_coerce(self, v):
             if v_lower in self.named_colorscales:
                 # Convert to color list
                 v = self.named_colorscales[v_lower]
-
+                v_valid = True
+            elif v_lower.endswith("_r") and v_lower[:-2] in self.named_colorscales:
+                v = self.named_colorscales[v_lower[:-2]][::-1]
+                v_valid = True
+            #
+            if v_valid:
                 # Convert to list of lists colorscale
                 d = len(v) - 1
                 v = [[(1.0 * i) / (1.0 * d), x] for i, x in enumerate(v)]
 
-                v_valid = True
-
         elif is_array(v) and len(v) > 0:
             # If firset element is a string, treat as colorsequence
             if isinstance(v[0], string_types):

packages/python/plotly/_plotly_utils/colors/_swatches.py

@@ -20,7 +20,7 @@ def _swatches(module_names, module_contents, template=None):
     sequences = [
         (k, v)
         for k, v in module_contents.items()
-        if not (k.startswith("_") or k == "swatches")
+        if not (k.startswith("_") or k == "swatches" or k.endswith("_r"))
     ]
 
     return go.Figure(

packages/python/plotly/_plotly_utils/colors/carto.py

@@ -382,3 +382,10 @@ def swatches(template=None):
     "rgb(237, 100, 90)",
     "rgb(165, 170, 153)",
 ]
+
+# Prefix variable names with _ so that they will not be added to the swatches
+_contents = dict(globals())
+for _k, _cols in _contents.items():
+    if _k.startswith("_") or _k == "swatches" or _k.endswith("_r"):
+        continue
+    globals()[_k + "_r"] = _cols[::-1]

packages/python/plotly/_plotly_utils/colors/cmocean.py

@@ -267,3 +267,10 @@ def swatches(template=None):
     "rgb(111, 23, 91)",
     "rgb(51, 13, 53)",
 ]
+
+# Prefix variable names with _ so that they will not be added to the swatches
+_contents = dict(globals())
+for _k, _cols in _contents.items():
+    if _k.startswith("_") or _k == "swatches" or _k.endswith("_r"):
+        continue
+    globals()[_k + "_r"] = _cols[::-1]

packages/python/plotly/_plotly_utils/colors/colorbrewer.py

@@ -456,3 +456,10 @@ def swatches(template=None):
     "rgb(189,0,38)",
     "rgb(128,0,38)",
 ]
+
+# Prefix variable names with _ so that they will not be added to the swatches
+_contents = dict(globals())
+for _k, _cols in _contents.items():
+    if _k.startswith("_") or _k == "swatches" or _k.endswith("_r"):
+        continue
+    globals()[_k + "_r"] = _cols[::-1]

packages/python/plotly/_plotly_utils/colors/cyclical.py

@@ -125,3 +125,10 @@ def swatches(template=None):
     "#9139fa",
     "#c543fa",
 ]
+
+# Prefix variable names with _ so that they will not be added to the swatches
+_contents = dict(globals())
+for _k, _cols in _contents.items():
+    if _k.startswith("_") or _k == "swatches" or _k.endswith("_r"):
+        continue
+    globals()[_k + "_r"] = _cols[::-1]

packages/python/plotly/_plotly_utils/colors/diverging.py

@@ -30,3 +30,10 @@ def swatches(template=None):
 
 
 swatches.__doc__ = _swatches.__doc__
+
+# Prefix variable names with _ so that they will not be added to the swatches
+_contents = dict(globals())
+for _k, _cols in _contents.items():
+    if _k.startswith("_") or _k == "swatches" or _k.endswith("_r"):
+        continue
+    globals()[_k + "_r"] = _cols[::-1]

packages/python/plotly/_plotly_utils/colors/plotlyjs.py

@@ -179,3 +179,10 @@
             scale_name=scale_name, scale_sequence=scale_sequence
         )
     )
+
+# Prefix variable names with _ so that they will not be added to the swatches
+_contents = dict(globals())
+for _k, _cols in _contents.items():
+    if _k.startswith("_") or _k == "swatches" or _k.endswith("_r"):
+        continue
+    globals()[_k + "_r"] = _cols[::-1]

packages/python/plotly/_plotly_utils/colors/qualitative.py

@@ -145,3 +145,10 @@ def swatches(template=None):
 
 from .colorbrewer import Set1, Pastel1, Dark2, Set2, Pastel2, Set3  # noqa: F401
 from .carto import Antique, Bold, Pastel, Prism, Safe, Vivid  # noqa: F401
+
+# Prefix variable names with _ so that they will not be added to the swatches
+_contents = dict(globals())
+for _k, _cols in _contents.items():
+    if _k.startswith("_") or _k == "swatches" or _k.endswith("_r"):
+        continue
+    globals()[_k + "_r"] = _cols[::-1]

packages/python/plotly/_plotly_utils/colors/sequential.py

@@ -155,3 +155,10 @@ def swatches(template=None):
     Agsunset,
     Brwnyl,
 )
+
+# Prefix variable names with _ so that they will not be added to the swatches
+_contents = dict(globals())
+for _k, _cols in _contents.items():
+    if _k.startswith("_") or _k == "swatches" or _k.endswith("_r"):
+        continue
+    globals()[_k + "_r"] = _cols[::-1]