def METHOD_NAME(self):  
    particles = self  
    for i,(x, y) in enumerate(particles.x):  
        circ = plt.Circle((x, y), H / 2, color='r', alpha=0.3)  
        ax.add_artist(circ)  
        ax.set_aspect("equal")  
        ax.set_xlim([0, 1200])  
        ax.set_ylim([0, 800])  