Python+matplotlib实现填充螺旋实例

填充螺旋演示结果：

实例代码：

'''
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'''
import matplotlib.pyplot as plt
import numpy as np
 
theta = np.arange(0, 8*np.pi, 0.1)
a = 1
b = .2
 
for dt in np.arange(0, 2*np.pi, np.pi/2.0):
 
  x = a*np.cos(theta + dt)*np.exp(b*theta)
  y = a*np.sin(theta + dt)*np.exp(b*theta)
 
  dt = dt + np.pi/4.0
 
  x2 = a*np.cos(theta + dt)*np.exp(b*theta)
  y2 = a*np.sin(theta + dt)*np.exp(b*theta)
 
  xf = np.concatenate((x, x2[::-1]))
  yf = np.concatenate((y, y2[::-1]))
 
  p1 = plt.fill(xf, yf)
 
plt.show()