Python+matplotlib实现填充螺旋实例

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()