Define cmap_name and added missing

Author: astrofrog

glue/viewers/scatter3d/layer_state.py

@@ -136,6 +136,10 @@ def flip_size(self):
     def flip_cmap(self):
         self.cmap_lim_helper.flip_limits()
 
+    @property
+    def cmap_name(self):
+        return colormaps.name_from_cmap(self.cmap)
+
     @property
     def point_sizes(self):
         if self.size_mode is None:

glue/viewers/volume3d/layer_state.py

@@ -72,3 +72,7 @@ def _update_priority(self, name):
 
     def flip_limits(self):
         self.lim_helper.flip_limits()
+
+    @property
+    def cmap_name(self):
+        return colormaps.name_from_cmap(self.cmap)