"""
===================================
Scatter plot with pie chart markers
===================================

This example makes custom 'pie charts' as the markers for a scatter plot.

Thanks to Manuel Metz for the example
"""
import math
import numpy as np
import matplotlib.pyplot as plt

# first define the ratios
r1 = 0.2       # 20%
r2 = r1 + 0.4  # 40%

# define some sizes of the scatter marker
sizes = [60, 80, 120]

# calculate the points of the first pie marker
#
# these are just the origin (0,0) +
# some points on a circle cos,sin
x = [0] + np.cos(np.linspace(0, 2*math.pi*r1, 10)).tolist()
y = [0] + np.sin(np.linspace(0, 2*math.pi*r1, 10)).tolist()

xy1 = list(zip(x, y))
s1 = max(max(x), max(y))

# ...
x = [0] + np.cos(np.linspace(2*math.pi*r1, 2*math.pi*r2, 10)).tolist()
y = [0] + np.sin(np.linspace(2*math.pi*r1, 2*math.pi*r2, 10)).tolist()
xy2 = list(zip(x, y))
s2 = max(max(x), max(y))

x = [0] + np.cos(np.linspace(2*math.pi*r2, 2*math.pi, 10)).tolist()
y = [0] + np.sin(np.linspace(2*math.pi*r2, 2*math.pi, 10)).tolist()
xy3 = list(zip(x, y))
s3 = max(max(x), max(y))

fig, ax = plt.subplots()
ax.scatter(np.arange(3), np.arange(3), marker=(xy1, 0),
           s=[s1*s1*_ for _ in sizes], facecolor='blue')
ax.scatter(np.arange(3), np.arange(3), marker=(xy2, 0),
           s=[s2*s2*_ for _ in sizes], facecolor='green')
ax.scatter(np.arange(3), np.arange(3), marker=(xy3, 0),
           s=[s3*s3*_ for _ in sizes], facecolor='red')

plt.show() 

　

Traceback (most recent call last):
  File "M:\______\scatter_piecharts.py", line 43, in 
    ax.scatter(np.arange(3), np.arange(3), marker=(xy1, 0),
  File "C:\Users\____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\__init__.py", line 1459, in inner
    return func(ax, *map(sanitize_sequence, args), **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\axes\_axes.py", line 4629, in scatter
    marker_obj = mmarkers.MarkerStyle(marker)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\markers.py", line 272, in __init__
    self._set_marker(marker)
  File "C:\Users\____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\markers.py", line 367, in _set_marker
    self._recache()
  File "C:\Users\____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\markers.py", line 291, in _recache
    self._marker_function()
  File "C:\Users\____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\markers.py", line 504, in _set_tuple_marker
    self._path = Path.unit_regular_polygon(numsides)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\____\AppData\Local\Programs\Python\Python311\Lib\site-packages\matplotlib\path.py", line 749, in unit_regular_polygon
    if numVertices <= 16:
       ^^^^^^^^^^^^^^^^^
TypeError: '<=' not supported between instances of 'list' and 'int' 

Traceback (most recent call last):
  File "E:\______\scatter_piecharts.py", line 43, in 
    ax.scatter(np.arange(3), np.arange(3), marker=(xy1, 0),
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\__init__.py", line 1478, in inner
    return func(ax, *map(sanitize_sequence, args), **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\axes\_axes.py", line 4697, in scatter
    marker_obj = mmarkers.MarkerStyle(marker)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\markers.py", line 255, in __init__
    self._set_marker(marker)
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\markers.py", line 343, in _set_marker
    self._recache()
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\markers.py", line 271, in _recache
    self._marker_function()
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\markers.py", line 480, in _set_tuple_marker
    self._path = Path.unit_regular_polygon(numsides)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\path.py", line 753, in unit_regular_polygon
    if numVertices <= 16:
       ^^^^^^^^^^^^^^^^^
TypeError: '<=' not supported between instances of 'list' and 'int' 

• 2023/11/10 Ver=1.04 Python 3.12.0 (matplotlib 3.8.1)で確認
• 2023/11/10 Ver=1.04 Python 3.11.6 (matplotlib 3.7.1)で確認
• 2023/03/28 Ver=1.03 Python 3.11.2 で確認
• 2020/10/29 Ver=1.01 Python 3.7.8 で確認
• 2018/11/23 Ver=1.01 初版リリース

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