python绘制动态曲线

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从txt种获取数据 并且通过动态曲线显示

import numpy as np 
import matplotlib.pyplot as plt 
import matplotlib.animation as animation 
import time 
# Fixing random state for reproducibility 
np.random.seed(196) 
path = "feed.txt" 
file = open(path, 'r') 
data = []
for line in file.readlines(): 
    lineArr = line.strip().split() 
    data.append(int(lineArr[0])) 
xdata = np.arange(0,len(data))
#初始数据绘图 
dis = np.zeros(40) 
dis2 = dis 
fig, ax = plt.subplots() 
line, = ax.plot(dis) 
ax.set_ylim(0, 100) 
plt.grid(True) 
ax.set_ylabel("distance: m") 
ax.set_xlabel("time") 

def update(frame): 
    global dis 
    global dis2 
    global line 
    #读入模拟 
    a = frame 
    time.sleep(np.random.rand()/10) 
    #绘图数据生成 
    dis[0:-1] = dis2[1:] 
    dis[-1] = a 
    dis2 = dis 
    #绘图
    line.set_ydata(dis)  
    #颜色设置 
    plt.setp(line, 'color', 'b', 'linewidth', 2.0) 
    return line 
ani = animation.FuncAnimation(fig, update,frames=data, interval=10) 
plt.show() 

输出：