import numpy as np
import matplotlib.pyplot as plt
from matplotlib import animation
def update_points_v3(num):
point_ani.set_data([x[num]], [y[num]])
if num % 5 == 0:
point_ani.set_marker("*")
point_ani.set_markersize(12)
else:
point_ani.set_marker("o")
point_ani.set_markersize(8)
text_pt.set_position((x[num], y[num]))
text_pt.set_text("x=%.2f, y=%.2f" % (x[num], y[num]))
return point_ani, text_pt,
def test3():
global x,y,point_ani,text_pt
x = np.linspace(0, 2 * np.pi, 100)
y = np.cos(x)
fig = plt.figure()
plt.plot(x, y)
point_ani, = plt.plot(x[0], y[0], "ro")
plt.grid(ls="--")
text_pt = plt.text(4, 0.8, '', fontsize=16)
ani = animation.FuncAnimation(fig, update_points_v3, np.arange(0, 100), interval=100, blit=True)
ani.save('cos_test3.gif', writer='pillow', fps=10)
# plt.show()
plt.close()
test3()
