Python通过matplotlib绘制动画简单实例_Python

Matplotlib是一个Python的2D绘图库，它以各种硬拷贝格式和跨平台的交互式环境生成出版质量级别的图形。

通过Matplotlib，开发者可以仅需要几行代码，便可以生成绘图，直方图，功率谱，条形图，错误图，散点图等。

matplotlib从1.1.0版本以后就开始支持绘制动画，具体使用可以参考官方帮助文档。下面是一个很基本的例子：

									"""

									A simple example of an animated plot

									"""

									import numpy as np

									from matplotlib import pyplot as plt

									from matplotlib import animation

									# First set up the figure, the axis, and the plot element we want to animate

									fig = plt.figure()

									# create our line object which will be modified in the animation

									ax = plt.axes(xlim=(0, 2), ylim=(-2, 2))

									# we simply plot an empty line: we'll add data to the line later

									line, = ax.plot([], [], lw=2) 

									# initialization function: plot the background of each frame

									def init():

									 line.set_data([], [])

									 return line,

									# animation function. This is called sequentially

									# It takes a single parameter, the frame number i 

									def animate(i):

									 x = np.linspace(0, 2, 1000)

									 y = np.sin(2 * np.pi * (x - 0.01 * i)) # update the data

									 line.set_data(x, y)

									 return line,

									# Makes an animation by repeatedly calling a function func

									# frames can be a generator, an iterable, or a number of frames.

									# interval draws a new frame every interval milliseconds.

									# blit=True means only re-draw the parts that have changed.

									# 在这里设置一个200帧的动画，每帧之间间隔20毫秒

									anim = animation.FuncAnimation(fig, animate, init_func=init,

									        frames=200, interval=20, blit=True)

									# save the animation as an mp4. This requires ffmpeg or mencoder to be

									# installed. The extra_args ensure that the x264 codec is used, so that

									# the video can be embedded in html5. You may need to adjust this for

									# your system: for more information, see

									# http://matplotlib.sourceforge.net/api/animation_api.html

									anim.save('basic_animation.mp4', fps=30, extra_args=['-vcodec', 'libx264'])

									plt.show() # plt.show() 会一直循环播放动画