Update hatch demo

dstansby · dstansby · commit 9b04f25ab3bd · 2020-06-27T13:58:04.000+01:00
diff --git a/examples/shapes_and_collections/hatch_demo.py b/examples/shapes_and_collections/hatch_demo.py
@@ -6,25 +6,24 @@
 Hatching (pattern filled polygons) is supported currently in the PS,
 PDF, SVG and Agg backends only.
 """
+import numpy as np
 import matplotlib.pyplot as plt
 from matplotlib.patches import Ellipse, Polygon
 
+x = np.arange(1, 5)
+y1 = np.arange(1, 5)
+y2 = np.ones(y1.shape) * 4
+
 fig, (ax1, ax2, ax3) = plt.subplots(3)
 
-ax1.bar(range(1, 5), range(1, 5), color='red', edgecolor='black', hatch="/")
-ax1.bar(range(1, 5), [6] * 4, bottom=range(1, 5),
-        color='blue', edgecolor='black', hatch='//')
+ax1.bar(x, y1, edgecolor='black', hatch="/")
+ax1.bar(x, y2, bottom=y1, edgecolor='black', hatch='//')
 ax1.set_xticks([1.5, 2.5, 3.5, 4.5])
 
-bars = ax2.bar(range(1, 5), range(1, 5), color='yellow', ecolor='black') + \
-    ax2.bar(range(1, 5), [6] * 4, bottom=range(1, 5),
-            color='green', ecolor='black')
+ax2.bar(x, y1, edgecolor='black', hatch=['-', '+', 'x', '\\'])
+ax2.bar(x, y2, bottom=y1, edgecolor='black', hatch=['*', 'o', 'O', '.'])
 ax2.set_xticks([1.5, 2.5, 3.5, 4.5])
 
-patterns = ('-', '+', 'x', '\\', '*', 'o', 'O', '.')
-for bar, pattern in zip(bars, patterns):
-    bar.set_hatch(pattern)
-
 ax3.fill([1, 3, 3, 1], [1, 1, 2, 2], fill=False, hatch='\\')
 ax3.add_patch(Ellipse((4, 1.5), 4, 0.5, fill=False, hatch='*'))
 ax3.add_patch(Polygon([[0, 0], [4, 1.1], [6, 2.5], [2, 1.4]], closed=True,
