Hi,
I'm trying to learn how to use FuncAnimation. I made some small
modifications to one of the matplotlib examples & tried it out, but I
encounter a problem. I'm trying to update a line plot every 1 sec & I have
my x-axis limit set to (0,10) initially. When the plot reaches x=10, I
change the x-axis limit to (10,20) & continue the plot from there. I found
that the 1st 2 seconds of the plot is always re-drawn in the 10th to 12th
seconds, 20th to 22nd seconds and so on. I don't understand what's going
on, so I hope someone here in this list can help me.
Just in case you don't understand what I mean, I've included the code below
so you'll have a better idea when you run the code:
import matplotlib
import numpy as np
from matplotlib.lines import Line2D
import matplotlib.pyplot as plt
import matplotlib.animation as animation
class Scope:
def __init__(self, ax, maxt=10, dt=1):
self.ax = ax
self.dt = dt
self.maxt = maxt
self.tdata = [0]
self.ydata = [0]
self.line = Line2D(self.tdata, self.ydata, marker='o')
self.ax.add_line(self.line)
self.ax.set_ylim(0, 200)
self.ax.set_xlim(0, self.maxt)
self.ax.set_xlabel("Time(s)")
self.ax.set_ylabel("Jitter Buffer Size(ms)",
color=self.line.get_color())
# self.ax.yaxis.label.set_color(self.line.get_color())
def update(self, y):
lastt = self.tdata[-1]
if lastt == self.tdata[0] + self.maxt: # reset the arrays
self.tdata = [self.tdata[-1]]
self.ydata = [self.ydata[-1]]
self.ax.set_xlim(self.tdata[0], self.tdata[0] + self.maxt)
self.ax.figure.canvas.draw()
t = self.tdata[-1] + self.dt
self.tdata.append(t)
self.ydata.append(y)
self.line.set_data(self.tdata, self.ydata)
return self.line,
def emitter():
while True:
yield np.random.randint(0,200)
fig = plt.figure()
ax = fig.add_subplot(111)
scope = Scope(ax)
# pass a generator in "emitter" to produce data for the update func
ani = animation.FuncAnimation(fig, scope.update, emitter, interval=1000,
blit=True)
plt.show()
Best Regards,
Clare.
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