Question

我正在研究一个脚本，它在一系列数据点上沿x轴移动一条垂直线。动画与import numpy as np from matplotlib import pyplot as plt from matplotlib import animation import time # Simulated background data x = np.linspace(0,61,62) y = np.linspace(0,6,62) # Set up the figure, the axis, and the plot element we want to animate max_height = 6 # max height of y-axis n_pts = 61 # max length of x-axis # Original location for progress line y1 = [0, max_height] x1 = [0, 0] fig = plt.figure() # Initialize figure #ax = fig.add_subplot(111) # Intialize axes ax = plt.axes(xlim=(0, n_pts), ylim=(0, max_height)) # Set axes limits line, = ax.plot([], [], lw=2) # Initialize line # draw the data to the 'background' line1, = ax.plot(x, y, color='black') # initialization function: plot the background of each frame def init(): line.set_data(x1, y1) return line, starttime=time.time() mytimer=0 mytimer_ref=0 # animation function. This is called sequentially def animate(i): t = time.time() - starttime mytimer = t + mytimer_ref x1 = [mytimer,mytimer] line.set_data(x1, y1) return line, # call the animator. anim = animation.FuncAnimation(fig, animate, init_func=init, frames=61, interval=1000) # 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 writer = animation.writers['ffmpeg'](fps=1) anim.save('demo.mp4',writer=writer,dpi=dpi) plt.show()一起正常，但我输出电影文件时遇到问题。请注意我是Python的新手，虽然我已经玩了一两年了。该脚本是通过将this tutorial中的第一个脚本与this previous stack overflow question的答案中显示的脚本相结合而创建的。该线最终将在静态数据线图上移动，我在这里将其描述为对角线。

电影文件输出为具有正确的时间长度（1分钟，10秒），但该线应该从最左边移动到最右边，每秒1点，只移动几个像素输出视频。

非常感谢您提供解决此问题的任何帮助。

编辑：我在Ubuntu 14.04上运行Python 2.7.6。

这是我可重现的代码：

import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
from time import time
from scipy.interpolate import interp1d

max_height = 6  # max height of y-axis
n_pts = 62      # max length of x-axis

x = np.linspace(0,61,62)
y = np.linspace(0,6,62)

# New figure with white background
fig = plt.figure(facecolor = 'white')
ax = plt.axes(aspect=1) # Set axes limits

# Original location for progress line
y1 = [0, max_height]
x1 = [0, 0]

# initialize line
plt.plot(x, y) #plot background
line, = ax.plot([], [], lw=2) 

def update(frame):
    x1 = frame
    line.set_data(x1, y1)

    # Return the modified line
    return line,

anim = animation.FuncAnimation(fig, update, interval=1000, blit=True)
anim.save('line.mp4', writer='ffmpeg')
plt.show()

编辑以下脚本会创建影片并将其另存为mp4。现在的问题是虽然有61帧动画，但我不能让电影停在那里。每次进行100帧。我知道这个问题现在有点老了，但是非常感谢任何帮助！

我试图手动设置x轴，这限制了屏幕上显示的内容，但动画继续超出显示的轴。

auto indices = hana::to<hana::tuple_tag>(hana::range_c<std::size_t, 0, sizeof...(T)>);
auto types = hana::make_tuple(std::forward<T>(args)...);
hana::for_each(hana::zip(indices, types), hana::fuse([](auto i, auto&& x) {
    // ...
}));

Answer 1

对于您编辑的代码，请在调用animation.FuncAnimation中包含另外两个参数：

frames=25（25选择为例） - 再次设置最大帧数
repeat=False - 不要在最大帧数后重复动画

组合，你得到这个命令：

anim = animation.FuncAnimation(fig, update, frames=25,
                               interval=1000, blit=True, repeat=False)

这导致动画逐步超过25帧（在您的情况下，在一秒间隔内将垂直线从0移动到24） - 然后停在那里。

Matplotlib动画无法正常保存

1 个答案: