python+matplotlib绘制饼图散点图实例代码


            本文是从matplotlib官网上摘录下来的一个实例，实现的功能是Python+matplotlib绘制自定义饼图作为散点图的标记，具体如下。

首先看下演示效果



实例代码：





import numpy as np

import matplotlib.pyplot as plt



# first define the ratios

r1 = 0.2    # 20%

r2 = r1 + 0.4 # 40%



# define some sizes of the scatter marker

sizes = np.array([60, 80, 120])



# calculate the points of the first pie marker

#

# these are just the origin (0,0) +

# some points on a circle cos,sin

x = [0] + np.cos(np.linspace(0, 2 * np.pi * r1, 10)).tolist()

y = [0] + np.sin(np.linspace(0, 2 * np.pi * r1, 10)).tolist()

xy1 = list(zip(x, y))

s1 = np.max(xy1)



x = [0] + np.cos(np.linspace(2 * np.pi * r1, 2 * np.pi * r2, 10)).tolist()

y = [0] + np.sin(np.linspace(2 * np.pi * r1, 2 * np.pi * r2, 10)).tolist()

xy2 = list(zip(x, y))

s2 = np.max(xy2)



x = [0] + np.cos(np.linspace(2 * np.pi * r2, 2 * np.pi, 10)).tolist()

y = [0] + np.sin(np.linspace(2 * np.pi * r2, 2 * np.pi, 10)).tolist()

xy3 = list(zip(x, y))

s3 = np.max(xy3)



fig, ax = plt.subplots()

ax.scatter(range(3), range(3), marker=(xy1, 0),

      s=s1 ** 2 * sizes, facecolor='blue')

ax.scatter(range(3), range(3), marker=(xy2, 0),

      s=s2 ** 2 * sizes, facecolor='green')

ax.scatter(range(3), range(3), marker=(xy3, 0),

      s=s3 ** 2 * sizes, facecolor='red')



plt.show()



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