test __eq__; polish help strings

python/damask/_colormap.py

@@ -80,7 +80,7 @@ class Colormap(mpl.colors.ListedColormap):
         """
         Create a perceptually uniform colormap between given (inclusive) bounds.
 
-        Colors are internally stored as R(ed) G(green) B(lue) values.
+        Colors are internally stored as RGB (Red Green Blue) values.
         The colormap can be used in matplotlib/seaborn or exported to
         file for external use.
 
@@ -154,8 +154,8 @@ class Colormap(mpl.colors.ListedColormap):
         """
         Select from a set of predefined colormaps.
 
-        Predefined colormaps include native matplotlib colormaps
-        and common DAMASK colormaps.
+        Predefined colormaps (Colormap.predefined) include
+        native matplotlib colormaps and common DAMASK colormaps.
 
         Parameters
         ----------
@@ -202,7 +202,7 @@ class Colormap(mpl.colors.ListedColormap):
         field : numpy.array of shape (:,:)
             Data to be shaded.
         bounds : iterable of float (2), optional
-            Value range (low,high) to shade with colormap.
+            Value range (low,high) spanned by colormap.
         gap : field.dtype, optional
             Transparent value. NaN will always be rendered transparent.
 
@@ -241,8 +241,8 @@ class Colormap(mpl.colors.ListedColormap):
         Parameters
         ----------
         name : str, optional
-            Name for the reversed colormap.
-            A name of None will be replaced by the name of the parent colormap + "_r".
+            Name of the reversed colormap.
+            If None, parent colormap name + "_r".
 
         Returns
         -------
@@ -259,26 +259,28 @@ class Colormap(mpl.colors.ListedColormap):
         return Colormap(np.array(rev.colors),rev.name[:-4] if rev.name.endswith('_r_r') else rev.name)
 
 
-    def _get_file_handle(self, fname: Union[TextIO, str, Path, None], ext: str) -> TextIO:
+    def _get_file_handle(self,
+                        fname: Union[TextIO, str, Path, None] = None,
+                        suffix: str = None) -> TextIO:
         """
-        Provide file handle.
+        Provide filehandle.
 
         Parameters
         ----------
         fname : file, str, pathlib.Path, or None
             Filename or filehandle.
-            If None, built from colormap name and ext.
-        ext: str
-            Extension of the filename.
+            If None, colormap name + suffix.
+        suffix: str, optional
+            Extension to use for colormap filename.
 
         Returns
         -------
         f : file object
-            File handle with write access.
+            Filehandle with write access.
 
         """
         if fname is None:
-            return open(self.name.replace(' ','_')+(ext if ext.startswith('.') else '.'+ext), 'w', newline='\n')
+            return open(self.name.replace(' ','_')+suffix, 'w', newline='\n')
         elif isinstance(fname, (str, Path)):
             return open(fname, 'w', newline='\n')
         else:
@@ -308,7 +310,7 @@ class Colormap(mpl.colors.ListedColormap):
                 'RGBPoints':colors
                }]
 
-        json.dump(out,self._get_file_handle(fname,'json'),indent=4)
+        json.dump(out,self._get_file_handle(fname,'.json'),indent=4)
 
 
     def save_ASCII(self, fname: Union[TextIO, str, Path] = None):
@@ -324,7 +326,7 @@ class Colormap(mpl.colors.ListedColormap):
         """
         labels = {'RGBA':4} if self.colors.shape[1] == 4 else {'RGB': 3}
         t = Table(self.colors,labels,f'Creator: {util.execution_stamp("Colormap")}')
-        t.save(self._get_file_handle(fname,'txt'))
+        t.save(self._get_file_handle(fname,'.txt'))
 
 
     def save_GOM(self, fname: Union[TextIO, str, Path] = None):
@@ -345,7 +347,7 @@ class Colormap(mpl.colors.ListedColormap):
                 + ' '.join([f' 0 {c[0]} {c[1]} {c[2]} 255 1' for c in reversed((self.colors*255).astype(int))]) \
                 + '\n'
 
-        self._get_file_handle(fname,'legend').write(GOM_str)
+        self._get_file_handle(fname,'.legend').write(GOM_str)
 
 
     def save_gmsh(self, fname: Union[TextIO, str, Path] = None):
@@ -363,7 +365,7 @@ class Colormap(mpl.colors.ListedColormap):
         gmsh_str = 'View.ColorTable = {\n' \
                  +'\n'.join([f'{c[0]},{c[1]},{c[2]},' for c in self.colors[:,:3]*255]) \
                  +'\n}\n'
-        self._get_file_handle(fname,'msh').write(gmsh_str)
+        self._get_file_handle(fname,'.msh').write(gmsh_str)
 
 
     @staticmethod

python/tests/test_Colormap.py

@@ -77,12 +77,15 @@ class TestColormap:
             # xyz2msh
             assert np.allclose(Colormap._xyz2msh(xyz),msh,atol=1.e-6,rtol=0)
 
+    def test_eq(self):
+        assert Colormap.from_predefined('strain') == Colormap.from_predefined('strain')
+        assert Colormap.from_predefined('strain') != Colormap.from_predefined('stress')
+        assert Colormap.from_predefined('strain',N=128) != Colormap.from_predefined('strain',N=64)
+
     @pytest.mark.parametrize('low,high',[((0,0,0),(1,1,1)),
                                          ([0,0,0],[1,1,1])])
     def test_from_range_types(self,low,high):
-        a = Colormap.from_range(low,high)
-        b = Colormap.from_range(np.array(low),np.array(high))
-        assert np.all(a.colors == b.colors) 
+        assert Colormap.from_range(low,high) == Colormap.from_range(np.array(low),np.array(high))
 
     @pytest.mark.parametrize('format',['ASCII','paraview','GOM','gmsh'])
     @pytest.mark.parametrize('model',['rgb','hsv','hsl','xyz','lab','msh'])