# Python |我预期不会出现的情节

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``````import math
from matplotlib import pyplot as plt
import numpy as np

dx=42; dy=-17; ab=10.5;  bc=42;  cd=24; be=65; ef=5;
ml = np.arange(0, 2*math.pi, math.pi/180)

for theta in ml:
alpha = -90*math.pi/180
P=2*cd*(dx-ab+math.cos(theta))
Q=2*cd*(dy-ab+math.sin(theta))
R=(dx**2)+(dy**2)+(ab**2)+(cd**2)-(bc**2)-(2*ab+(math.cos(theta))+dy+(math.sin(theta)))

math_cos_phi=((-P*R)-(Q*math.sqrt((P**2)+(Q**2)-(R**2))))/((P**2)+(Q**2));
math_sin_phi=((-Q*R)+(P*math.sqrt((P**2)+(Q**2)-(R**2))))/((P**2)+(Q**2));
a = math_cos_phi;  b = math_sin_phi
phi=math.atan2(a,b);

math.cos_psi=((dx+cd+(math_cos_phi))-(ab+math.cos(theta)))/bc;
math.sin_psi=((dy+cd+(math_sin_phi))-(ab+math.sin(theta)))/bc;
c = math.cos_psi;  d = math.sin_psi;

psi=math.atan2(c,d);
Fx=ab*math.cos(theta)+be*math.cos(psi)+ef*math.cos(psi+alpha);
Fy=ab*math.sin(theta)+be*math.sin(psi)+ef*math.sin(psi+alpha);
plt.plot(Fx,Fy, c = 'g', linewidth=2);
plt.show()

Data=[theta*180/math.pi,Fx,Fy];
``````