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#!/usr/bin/env python
Illustrate the three different join styles

import numpy as np
import matplotlib
import matplotlib.pyplot as plt

def plot_angle(ax, x, y, angle, style):
    phi = angle/180*np.pi
    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 = plt.figure()
ax = fig.add_subplot(111)
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)


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