Python中的图形绘制简单动画实操

import matplotlib.pyplot as plt
import matplotlib.animation as animation
import numpy as np
  
# create a figure, axis and plot element
fig = plt.figure()
ax = plt.axes(xlim=(-50, 50), ylim=(-50, 50))
line, = ax.plot([], [], lw=2)
  
# initialization function
def init():
    # creating an empty plot/frame
    line.set_data([], [])
    return line,
  
# lists to store x and y axis points
xdata, ydata = [], []
  
# animation function
def animate(i):
    # t is a parameter
    t = 0.1*i
      
    # x, y values to be plotted
    x = t*np.sin(t)
    y = t*np.cos(t)
      
    # appending new points to x, y axes points list
    xdata.append(x)
    ydata.append(y)
      
    # set/update the x and y axes data
    line.set_data(xdata, ydata)
      
    # return line object
    return line,
      
# setting a title for the plot
plt.title('A growing coil!')
# hiding the axis details
plt.axis('off')
  
# call the animator    
anim = animation.FuncAnimation(fig, animate, init_func=init,
                               frames=500, interval=20, blit=True)
  
# save the animation as mp4 video file
anim.save('animated_coil.mp4', writer = 'FFmpeg', fps = 30)
  
# show the plot
plt.show()

fig = plt.figure()
ax = plt.axes(xlim=(-50, 50), ylim=(-50, 50))
line, = ax.plot([], [], lw=2)

def init():
    line.set_data([], [])
    return line，

def animate(i):
    # t is a parameter
    t = 0.1*i


    # x, y values to be plotted
    x = t*np.sin(t)
    y = t*np.cos(t)


    # appending new points to x, y axes points list
    xdata.append(x)
    ydata.append(y)
    
    # set/update the x and y axes data
    line.set_data(xdata, ydata)


    # return line object
    return line，

t = 0.1*i

x = t*np.sin(t)
y = t*np.cos(t)

line.set_data(xdata, ydata)
return line，

anim = animation.FuncAnimation(fig, animate, init_func=init, frames=500, interval=20, blit=True)