Changed fill.py example to be less misleading, after issue #5827

Sam Vaughan · Sam Vaughan · commit 258f2fb5686d · 2018-04-09T21:26:52.000+01:00
diff --git a/examples/lines_bars_and_markers/fill.py b/examples/lines_bars_and_markers/fill.py
@@ -5,23 +5,21 @@
 
 Demo fill plot.
 """
+
+###############################################################################
+# First, the most basic fill plot a user can make with matplotlib:
 import numpy as np
 import matplotlib.pyplot as plt
 
-x = np.linspace(0, 1, 500)
-y = np.sin(4 * np.pi * x) * np.exp(-5 * x)
 
-###############################################################################
-# First, the most basic fill plot a user can make with matplotlib:
+x = [0, 0, 1, 2, 2]
+y = [0, 1, 2, 1, 0]
 
 fig, ax = plt.subplots()
-
 ax.fill(x, y, zorder=10)
 ax.grid(True, zorder=5)
 
-x = np.linspace(0, 2 * np.pi, 500)
-y1 = np.sin(x)
-y2 = np.sin(3 * x)
+
 
 ###############################################################################
 # Next, a few more optional features:
@@ -30,6 +28,20 @@
 # * Setting the fill color.
 # * Setting the opacity (alpha value).
 
+
+x = np.linspace(0, 1.5 * np.pi, 500)
+y1 = np.sin(x)
+y2 = np.sin(3 * x)
+
 fig, ax = plt.subplots()
+
 ax.fill(x, y1, 'b', x, y2, 'r', alpha=0.3)
+
+# Also outline the region we've filled in
+ax.plot(x, y1, c='b', alpha=0.8)
+ax.plot(x, y2, c='r', alpha=0.8)
+ax.plot([x[0], x[-1]], [y1[0], y1[-1]], c='b', alpha=0.8)
+ax.plot([x[0], x[-1]], [y2[0], y2[-1]], c='r', alpha=0.8)
+
+
 plt.show()
