py畫框框

import matplotlib 
import matplotlib.pyplot as plt 
  
  
fig = plt.figure() 
ax = fig.add_subplot(111) 
  
rect1 = matplotlib.patches.Rectangle((-200, -100), 
                                     400, 200, 
                                     color ='green') 
  
rect2 = matplotlib.patches.Rectangle((0, 150), 
                                     300, 20, 
                                     color ='pink') 
  
rect3 = matplotlib.patches.Rectangle((-300, -50), 
                                     40, 200, 
                                     color ='yellow') 
  
ax.add_patch(rect1) 
ax.add_patch(rect2) 
ax.add_patch(rect3) 

ax.arrow(0, -400, 0, 750, head_width=7.5, linewidth=0.1, color='r')
#ax.grid(True, linestyle='-.')

plt.xlim([-400, 400])
plt.ylim([-400, 400])
  
plt.show()