Enable choosing the even-odd rule for filling shapes - #32253

import matplotlib
#matplotlib.use('TkCairo')

import numpy as np

import matplotlib.pyplot as plt
from matplotlib.patches import PathPatch, Polygon
from matplotlib.path import Path

deg = np.arange(6) * 144
x = np.sin(deg * np.pi / 180)
y = np.cos(deg * np.pi / 180)
star = np.stack([x, y], axis=1)

square_vertices = np.array([[-1, -1], [-1, 1], [1, 1], [1, -1], [-1, -1]])
square_codes = [Path.MOVETO, Path.LINETO, Path.LINETO, Path.LINETO, Path.LINETO]

fig, axs = plt.subplots(1, 2, figsize=(4, 5))

for ax, fill_rule in zip(axs, ['nonzero', 'evenodd']):
    stroked_star = Polygon(star + [0, 4], closed=False, ec='b', lw=5, ls=(0, (5, 1)),
                           fc='r', hatch='xx', fill_rule=fill_rule)
    ax.add_patch(stroked_star)

    nonstroked_star = Polygon(star + [0, 2], closed=False, ec='none',
                              fc='r', hatch='xx', fill_rule=fill_rule)
    ax.add_patch(nonstroked_star)

    squares = Path(np.vstack([square_vertices * 0.9,
                              square_vertices / 3 + [0, 0.5],
                              square_vertices / 3 + [0.3, 0],
                              (square_vertices / 3)[::-1, :] + [0, -0.5]]),
                   square_codes * 4)
    
    ax.add_patch(PathPatch(squares, fc='g', ec='m', fill_rule=fill_rule))

    ax.set_xlim(-1, 1)
    ax.set_ylim(-1, 5.1)
    ax.set_aspect('equal')
    ax.set_axis_off()
    ax.set_title(f'fill_rule={fill_rule}')

plt.show()