Join styles

Illustrate the three different join styles.

import numpy as np
import matplotlib.pyplot as plt


def plot_angle(ax, x, y, angle, style):
    phi = np.radians(angle)
    xx = [x + .5, x, x + .5*np.cos(phi)]
    yy = [y, y, y + .5*np.sin(phi)]
    ax.plot(xx, yy, lw=8, color='blue', solid_joinstyle=style)
    ax.plot(xx[1:], yy[1:], lw=1, color='black')
    ax.plot(xx[1::-1], yy[1::-1], lw=1, color='black')
    ax.plot(xx[1:2], yy[1:2], 'o', color='red', markersize=3)
    ax.text(x, y + .2, '%.0f degrees' % angle)

fig, ax = plt.subplots()
ax.set_title('Join style')

for x, style in enumerate((('miter', 'round', 'bevel'))):
    ax.text(x, 5, style)
    for i in range(5):
        plot_angle(ax, x, i, pow(2.0, 3 + i), style)

ax.set_xlim(-.5, 2.75)
ax.set_ylim(-.5, 5.5)
plt.show()