Improve fancyarrow_demo.

Don't alphabetically sort the arrowstyles; the order of definition in
the source makes more sense.  (The `sorted` call was necessary back when
dicts were unsorted.)  Also move the definition of BracketAB after
BracketA and BracketB, for consistency with the other arrow styles.

Various small fixes (making the axis invisible is already done by
frameon=False, no need to use mathtext).

Author: anntzer

examples/text_labels_and_annotations/fancyarrow_demo.py

@@ -4,8 +4,8 @@
 ================================
 
 Overview of the arrow styles available in `~.Axes.annotate`.
-
 """
+
 import matplotlib.patches as mpatches
 import matplotlib.pyplot as plt
 
@@ -17,27 +17,16 @@
 fig = plt.figure(figsize=(4 * ncol / 1.5, figheight / 1.5))
 fontsize = 0.2 * 70
 
+ax = fig.add_axes([0, 0, 1, 1], frameon=False)
+ax.set(xlim=(0, 4 * ncol), ylim=(0, figheight))
 
-ax = fig.add_axes([0, 0, 1, 1], frameon=False, aspect=1.)
-
-ax.set_xlim(0, 4 * ncol)
-ax.set_ylim(0, figheight)
-
-
-def to_texstring(s):
-    s = s.replace("<", r"$<$")
-    s = s.replace(">", r"$>$")
-    s = s.replace("|", r"$|$")
-    return s
-
-
-for i, (stylename, styleclass) in enumerate(sorted(styles.items())):
+for i, (stylename, styleclass) in enumerate(styles.items()):
     x = 3.2 + (i // nrow) * 4
     y = (figheight - 0.7 - i % nrow)  # /figheight
     p = mpatches.Circle((x, y), 0.2)
     ax.add_patch(p)
 
-    ax.annotate(to_texstring(stylename), (x, y),
+    ax.annotate(stylename, (x, y),
                 (x - 1.2, y),
                 ha="right", va="center",
                 size=fontsize,
@@ -50,9 +39,6 @@ def to_texstring(s):
                                 ),
                 bbox=dict(boxstyle="square", fc="w"))
 
-ax.xaxis.set_visible(False)
-ax.yaxis.set_visible(False)
-
 plt.show()
 
 #############################################################################

lib/matplotlib/patches.py

@@ -3466,28 +3466,6 @@ def transmute(self, path, mutation_size, linewidth):
 
             return p, False
 
-    @_register_style(_style_list, name="]-[")
-    class BracketAB(_Bracket):
-        """An arrow with outward square brackets at both ends."""
-
-        def __init__(self,
-                     widthA=1., lengthA=0.2, angleA=0,
-                     widthB=1., lengthB=0.2, angleB=0):
-            """
-            Parameters
-            ----------
-            widthA, widthB : float, default: 1.0
-                Width of the bracket.
-            lengthA, lengthB : float, default: 0.2
-                Length of the bracket.
-            angleA, angleB : float, default: 0 degrees
-                Orientation of the bracket, as a counterclockwise angle.
-                0 degrees means perpendicular to the line.
-            """
-            super().__init__(True, True,
-                             widthA=widthA, lengthA=lengthA, angleA=angleA,
-                             widthB=widthB, lengthB=lengthB, angleB=angleB)
-
     @_register_style(_style_list, name="]-")
     class BracketA(_Bracket):
         """An arrow with an outward square bracket at its start."""
@@ -3526,6 +3504,28 @@ def __init__(self, widthB=1., lengthB=0.2, angleB=None):
             super().__init__(None, True,
                              widthB=widthB, lengthB=lengthB, angleB=angleB)
 
+    @_register_style(_style_list, name="]-[")
+    class BracketAB(_Bracket):
+        """An arrow with outward square brackets at both ends."""
+
+        def __init__(self,
+                     widthA=1., lengthA=0.2, angleA=0,
+                     widthB=1., lengthB=0.2, angleB=0):
+            """
+            Parameters
+            ----------
+            widthA, widthB : float, default: 1.0
+                Width of the bracket.
+            lengthA, lengthB : float, default: 0.2
+                Length of the bracket.
+            angleA, angleB : float, default: 0 degrees
+                Orientation of the bracket, as a counterclockwise angle.
+                0 degrees means perpendicular to the line.
+            """
+            super().__init__(True, True,
+                             widthA=widthA, lengthA=lengthA, angleA=angleA,
+                             widthB=widthB, lengthB=lengthB, angleB=angleB)
+
     @_register_style(_style_list, name="|-|")
     class BarAB(_Bracket):
         """An arrow with vertical bars ``|`` at both ends."""