怎么将车队跟驰过程中车间距的变化画出来

我想要将车队在跟驰过程中发生的车间距变化和速度变化画出一个动画，但是不知道怎么体现这个变化，下面是目前写出来的代码

import matplotlib.pyplot as plt
import numpy as np
import cv2
from matplotlib import animation

img0 = np.zeros((200, 400, 3), dtype=np.uint8)

fig = plt.figure()
ax = plt.gca()
line = plt.imshow(img0)

def animate(i):
img = cv2.rectangle(img0.copy(), (167+4i, 100), (187+4i, 120), (255, 255, 255))
speed=0.161
img = cv2.rectangle(img, (143 + 4 * i, 100), (163 + 4 * i, 120), (255, 255, 255))
img = cv2.rectangle(img, (118 + 4 * i, 100), (138 + 4 * i, 120), (255, 255, 255))
img = cv2.rectangle(img, (92 + 4 * i, 100), (112 + 4 * i, 120), (255, 255, 255))
img = cv2.rectangle(img, (65 + 4 * i, 100), (85 + 4 * i, 120), (255, 255, 255))
img = cv2.rectangle(img, (39 + 4 * i, 100), (59 + 4 * i, 120), (255, 255, 255))
img = cv2.rectangle(img, (10 + 4 * i, 100), (30 + 4 * i, 120), (255, 255, 255))
line.set_data(img)
return line

anim = animation.FuncAnimation(fig, animate, frames=50, interval=200, repeat=False)
plt.show()