Hi, I have a question about could animation be triggered only when an onclick event in Silder? For example, there’s a `Slider`

object which represents the frequency. When I click on the object and choose on one frequency value, a `sin`

curve will be shown and also there’s a moving dot on the curve which will show an animation about the moving dot.

```
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.animation import FuncAnimation
from matplotlib.widgets import Slider
fig, ax = plt.subplots()
plt.subplots_adjust(left=0.25, bottom=0.25)
axfreq = plt.axes([0.25, 0.1, 0.65, 0.03], facecolor='lightgoldenrodyellow')
sfreq = Slider(axfreq, 'Freq', 0.1, 20.0, valinit=3, valstep=5.0)
x = np.linspace(0, 5, 100)
y = np.sin(3 * x)
l, = ax.plot(x, y)
node, = ax.plot([x[0]], [y[0]], 'bo')
def animate(x, freq):
y = np.sin(freq * x)
node.set_data(x, y)
return node
def update(val):
freq = sfreq.val
l.set_ydata(np.sin(freq * x))
FuncAnimation(fig, animate, frames=np.linspace(0, 5, 100), fargs=(freq, ), repeat=False)
fig.canvas.draw_idle()
sfreq.on_changed(update)
plt.show()
```

However the code above doesn’t show the animation but only a `sin`

curve and the initial dot on it. Are there some examples? Thank you.