%matplotlib inline
import numpy as np
import matplotlib.pyplot as plt
from skimage.draw import (line, polygon, circle,
                          circle_perimeter,
                          ellipse, ellipse_perimeter,
                          bezier_curve)

# Draw a rectangle
img = np.ones((10, 10), dtype=np.double) # a gray image
left = (3, 5)
right = (7, 6)
img[left[0]: right[0], left[1]: right[1]] = 0
plt.imshow(img, cmap=plt.cm.gray)


# Draw a circle
img = np.ones((500, 500, 3), dtype=np.double)
rr, cc = circle(200, 300, 100) # x, y, radius
img[rr, cc, :] = 0
plt.imshow(img)