Note
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Filled polygon#
fill()
draws a filled polygon based on lists of point
coordinates x, y.
This example uses the Koch snowflake as an example polygon.
import matplotlib.pyplot as plt
import numpy as np
def koch_snowflake(order, scale=10):
"""
Return two lists x, y of point coordinates of the Koch snowflake.
Parameters
----------
order : int
The recursion depth.
scale : float
The extent of the snowflake (edge length of the base triangle).
"""
def _koch_snowflake_complex(order):
if order == 0:
# initial triangle
angles = np.array([0, 120, 240]) + 90
return scale / np.sqrt(3) * np.exp(np.deg2rad(angles) * 1j)
else:
ZR = 0.5 - 0.5j * np.sqrt(3) / 3
p1 = _koch_snowflake_complex(order - 1) # start points
p2 = np.roll(p1, shift=-1) # end points
dp = p2 - p1 # connection vectors
new_points = np.empty(len(p1) * 4, dtype=np.complex128)
new_points[::4] = p1
new_points[1::4] = p1 + dp / 3
new_points[2::4] = p1 + dp * ZR
new_points[3::4] = p1 + dp / 3 * 2
return new_points
points = _koch_snowflake_complex(order)
x, y = points.real, points.imag
return x, y
Basic usage:
![fill](../../_images/sphx_glr_fill_001.png)
Use keyword arguments facecolor and edgecolor to modify the colors of the polygon. Since the linewidth of the edge is 0 in the default Matplotlib style, we have to set it as well for the edge to become visible.
![fill](../../_images/sphx_glr_fill_002.png)
References
The use of the following functions, methods, classes and modules is shown in this example: