# 中秋节到了，送你一个Python做的Crossin牌“月饼”

```import numpy as np
from numpy import sin, cos, pi
import matplotlib.pyplot as plt
import matplotlib.patches as mpatch
from matplotlib.patches import Arc, Circle, Wedge
from matplotlib.collections import PatchCollection```

```length = 20
R = 3**0.5*length/(3**0.5*cos(pi/12)-sin(pi/12))
r = 2*sin(pi/12)*R/3**0.5```

```arc1 = Arc([0, length], width=2*r, height=2*r, angle=0, theta1=30, theta2=150, ec='orange', linewidth=4)
arc2 = Arc([-length/2, length/2*3**0.5], width=2*r, height=2*r, angle=0, theta1=60, theta2=180, ec='orange', linewidth=4)
arc3 = Arc([-length/2*3**0.5, length/2], width=2*r, height=2*r, angle=0, theta1=90, theta2=210, ec='orange', linewidth=4)
arc4 = Arc([-length, 0], width=2*r, height=2*r, angle=0, theta1=120, theta2=240, ec='orange', linewidth=4)
arc5 = Arc([-length/2*3**0.5, -length/2], width=2*r, height=2*r, angle=0, theta1=150, theta2=270, ec='orange', linewidth=4)
arc6 = Arc([-length/2, -length/2*3**0.5], width=2*r, height=2*r, angle=0, theta1=180, theta2=300, ec='orange', linewidth=4)
arc7 = Arc([0, -length], width=2*r, height=2*r, angle=0, theta1=210, theta2=330, ec='orange', linewidth=4)
arc8 = Arc([length/2, -length/2*3**0.5], width=2*r, height=2*r, angle=0, theta1=240, theta2=360, ec='orange', linewidth=4)
arc9 = Arc([length/2*3**0.5, -length/2], width=2*r, height=2*r, angle=0, theta1=270, theta2=390, ec='orange', linewidth=4)
arc10 = Arc([length, 0], width=2*r, height=2*r, angle=0, theta1=300, theta2=420, ec='orange', linewidth=4)
arc11 = Arc([length/2*3**0.5, length/2], width=2*r, height=2*r, angle=0, theta1=330, theta2=450, ec='orange', linewidth=4)
arc12 = Arc([length/2, length/2*3**0.5], width=2*r, height=2*r, angle=0, theta1=0, theta2=120, ec='orange', linewidth=4)```

`arc1 = Arc([0, length], width=2*r, height=2*r, angle=0, theta1=30, theta2=150, ec='orange', linewidth=4)`

`circle = Circle((0,0), R, ec='orange', fc='white', linewidth=4)`

```wedge1 = Wedge([-2, 2], R-5, 90, 180, ec='orange', fc=r'white', linewidth=4)
wedge2 = Wedge([-5, 5], R-12, 90, 180, ec='orange', fc=r'white', linewidth=4)
wedge3 = Wedge([-2, -2], R-5, 180, 270, ec='orange', fc=r'white', linewidth=4)
wedge4 = Wedge([-5, -5], R-12, 180, 270, ec='orange', fc=r'white', linewidth=4)
wedge5 = Wedge([2, -2], R-5, 270, 360, ec='orange', fc=r'white', linewidth=4)
wedge6 = Wedge([5, -5], R-12, 270, 360, ec='orange', fc=r'white', linewidth=4)
wedge7 = Wedge([2, 2], R-5, 0, 90, ec='orange', fc=r'white', linewidth=4)
wedge8 = Wedge([5, 5], R-12, 0, 90, ec='orange', fc=r'white', linewidth=4)```

`wedge1 = Wedge([-2, 2], R-5, 90, 180, ec='orange', fc=r'white', linewidth=4)`

```art_list = [arc1, arc2, arc3, arc4, arc5, arc6, arc7, arc8, arc9, arc10, arc11, arc12]
art_list.extend([circle, wedge1, wedge2, wedge3, wedge4, wedge5, wedge6, wedge7, wedge8])
fig, ax = plt.subplots(figsize=(8,8))
ax.set_aspect('equal')
for a in art_list:
plt.text(-18, -2.5, 'CROSSIN', fontfamily=r'Times New Man', bbox=dict(boxstyle='square', fc="w", ec='orange', linewidth=4),  fontsize=50, color='orange')
plt.ylim([-35, 35])
plt.xlim([-35, 35])
plt.show()```

art_list是我们设置的一个list变量，里面放有arc1到arc12这12个图形，然后再把circle以及8个扇形都加进去。 ax.set_aspect(‘equal’) 是设置整个图形x轴和y轴同比例， for a in art_list: ax.add_patch(a) 是把art_list中所有图形加入到画布当中。而 plt.text 这行代码中，-18和-2.5是这个text的左下角的坐标， fontfamilyfontsize 分别是文字的字体和大小， bbox 是设置text边框的格式，这些参数也都和前面讲过的很多参数差不多，这里不再赘述。 plt.ylimplt.xlim 是设置整个画布的坐标范围。最终效果如图1所示。

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