>>> """ =========== Fill Spiral =========== """
... 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()
...