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DOC: (subjectively) nicer annotated barchart example #9907

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Dec 1, 2017
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DOC: (subjectively) nicer annotated barchart example #9907

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49 changes: 27 additions & 22 deletions examples/api/barchart.py
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Expand Up @@ -3,45 +3,50 @@
Barchart
========

A bar plot with errorbars and height labels on individual bars
A bar plot with errorbars and height labels on individual bars.
"""
import numpy as np
import matplotlib.pyplot as plt

N = 5
men_means = (20, 35, 30, 35, 27)
men_std = (2, 3, 4, 1, 2)
men_means, men_std = (20, 35, 30, 35, 27), (2, 3, 4, 1, 2)
women_means, women_std = (25, 32, 34, 20, 25), (3, 5, 2, 3, 3)

ind = np.arange(N) # the x locations for the groups
width = 0.35 # the width of the bars
ind = np.arange(len(men_means)) # the x locations for the groups
width = 0.35 # the width of the bars

fig, ax = plt.subplots()
rects1 = ax.bar(ind, men_means, width, color='r', yerr=men_std)
rects1 = ax.bar(ind - width/2, men_means, width, yerr=men_std,
color='SkyBlue', label='Men')
rects2 = ax.bar(ind + width/2, women_means, width, yerr=women_std,
color='IndianRed', label='Women')

women_means = (25, 32, 34, 20, 25)
women_std = (3, 5, 2, 3, 3)
rects2 = ax.bar(ind + width, women_means, width, color='y', yerr=women_std)

# add some text for labels, title and axes ticks
# Add some text for labels, title and custom x-axis tick labels, etc.
ax.set_ylabel('Scores')
ax.set_title('Scores by group and gender')
ax.set_xticks(ind + width / 2)
ax.set_xticks(ind)
ax.set_xticklabels(('G1', 'G2', 'G3', 'G4', 'G5'))

ax.legend((rects1[0], rects2[0]), ('Men', 'Women'))
ax.legend()


def autolabel(rects):
def autolabel(rects, xpos='center'):
"""
Attach a text label above each bar displaying its height
Attach a text label above each bar in *rects*, displaying its height.

*xpos* indicates which side to place the text w.r.t. the center of
the bar. It can be one of the following {'center', 'right', 'left'}.
"""

xpos = xpos.lower() # normalize the case of the parameter
ha = {'center': 'center', 'right': 'left', 'left': 'right'}
offset = {'center': 0.5, 'right': 0.57, 'left': 0.43} # x_txt = x + w*off

for rect in rects:
height = rect.get_height()
ax.text(rect.get_x() + rect.get_width()/2., 1.05*height,
'%d' % int(height),
ha='center', va='bottom')
ax.text(rect.get_x() + rect.get_width()*offset[xpos], 1.01*height,
'{}'.format(height), ha=ha[xpos], va='bottom')


autolabel(rects1)
autolabel(rects2)
autolabel(rects1, "left")
autolabel(rects2, "right")

plt.show()