python - 如何将参数传递给 animation.FuncAnimation()？

Question

如何将参数传递给animation.FuncAnimation()？我试过了，但没用。 animation.FuncAnimation() 的签名是

class matplotlib.animation.FuncAnimation(fig, func, frames=None, init_func=None, fargs=None, save_count=None, **kwargs) Bases: matplotlib.animation.TimedAnimation

我已经在下面粘贴了我的代码。我必须做出哪些改变？

import matplotlib.pyplot as plt
import matplotlib.animation as animation

def animate(i,argu):
    print argu

    graph_data = open('example.txt','r').read()
    lines = graph_data.split('\n')
    xs = []
    ys = []
    for line in lines:
        if len(line) > 1:
            x, y = line.split(',')
            xs.append(x)
            ys.append(y)
        ax1.clear()
        ax1.plot(xs, ys)
        plt.grid()

ani = animation.FuncAnimation(fig,animate,fargs = 5,interval = 100)
plt.show()

Answer 1

检查这个简单的例子:

# -*- coding: utf-8 -*-
import matplotlib.pyplot as plt 
import matplotlib.animation as animation
import numpy as np

data = np.loadtxt("example.txt", delimiter=",")
x = data[:,0]
y = data[:,1]

fig = plt.figure()
ax = fig.add_subplot(111)
line, = ax.plot([],[], '-')
line2, = ax.plot([],[],'--')
ax.set_xlim(np.min(x), np.max(x))
ax.set_ylim(np.min(y), np.max(y))

def animate(i,factor):
    line.set_xdata(x[:i])
    line.set_ydata(y[:i])
    line2.set_xdata(x[:i])
    line2.set_ydata(factor*y[:i])
    return line,line2

K = 0.75 # any factor 
ani = animation.FuncAnimation(fig, animate, frames=len(x), fargs=(K,),
                              interval=100, blit=True)
plt.show()

首先，对于数据处理推荐使用NumPy，最简单的读写数据。

您不必在每个动画步骤中使用“plot”函数，而是使用 set_xdata 和 set_ydata 方法来更新数据。

还回顾了 Matplotlib 文档的示例:http://matplotlib.org/1.4.1/examples/animation/ .