条形码演示

本演示演示如何生成一维图像或“条形码”。

import matplotlib.pyplot as plt
import numpy as np

# Fixing random state for reproducibility
np.random.seed(19680801)

# the bar
x = np.random.rand(500) > 0.7

barprops = dict(aspect='auto', cmap='binary', interpolation='nearest')

fig = plt.figure()

# a vertical barcode
ax1 = fig.add_axes([0.1, 0.1, 0.1, 0.8])
ax1.set_axis_off()
ax1.imshow(x.reshape((-1, 1)), **barprops)

# a horizontal barcode
ax2 = fig.add_axes([0.3, 0.4, 0.6, 0.2])
ax2.set_axis_off()
ax2.imshow(x.reshape((1, -1)), **barprops)

plt.show()

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工具书类

本例中显示了以下函数、方法和类的使用：

import matplotlib
matplotlib.axes.Axes.imshow
matplotlib.pyplot.imshow

出：

<function imshow at 0x7faa00cfa9d8>