Python-如何为散点图制作动画?

我正在尝试制作散点图的动画,其中点的颜色和大小在动画的不同阶段会发生变化。对于数据,我有两个带有x值和y值的numpy ndarray:

data.shape = (ntime, npoint)

x.shape = (npoint)

y.shape = (npoint)

现在我想绘制一个散点图

pylab.scatter(x,y,c=data[i,:])

并在索引上创建动画i。我该怎么做呢?

回答:

假设有一个散点图scat = ax.scatter(…),则可以

改变立场

scat.set_offsets(array)

其中array是N x 2x和y坐标的形状数组。

改变大小

scat.set_sizes(array)

其中array是以点为单位的一维尺寸数组。

改变颜色

scat.set_array(array)

其中array是一维值数组,将对其进行颜色映射。

这是一个使用animation模块的简单示例。

它比必须的要复杂一些,但是这应该为您提供一个做奇特的事情的框架。

(代码编辑于2019年4月以与当前版本兼容。有关旧代码,请参阅修订历史记录)

import matplotlib.pyplot as plt

import matplotlib.animation as animation

import numpy as np

class AnimatedScatter(object):

“”“An animated scatter plot using matplotlib.animations.FuncAnimation.”“”

def (self, numpoints=50):

self.numpoints = numpoints

self.stream = self.data_stream()

    # Setup the figure and axes...

self.fig, self.ax = plt.subplots()

# Then setup FuncAnimation.

self.ani = animation.FuncAnimation(self.fig, self.update, interval=5,

init_func=self.setup_plot, blit=True)

def setup_plot(self):

"""Initial drawing of the scatter plot."""

x, y, s, c = next(self.stream).T

self.scat = self.ax.scatter(x, y, c=c, s=s, vmin=0, vmax=1,

cmap="jet", edgecolor="k")

self.ax.axis([-10, 10, -10, 10])

# For FuncAnimation's sake, we need to return the artist we'll be using

# Note that it expects a sequence of artists, thus the trailing comma.

return self.scat,

def data_stream(self):

"""Generate a random walk (brownian motion). Data is scaled to produce

a soft "flickering" effect."""

xy = (np.random.random((self.numpoints, 2))-0.5)*10

s, c = np.random.random((self.numpoints, 2)).T

while True:

xy += 0.03 * (np.random.random((self.numpoints, 2)) - 0.5)

s += 0.05 * (np.random.random(self.numpoints) - 0.5)

c += 0.02 * (np.random.random(self.numpoints) - 0.5)

yield np.c_[xy[:,0], xy[:,1], s, c]

def update(self, i):

"""Update the scatter plot."""

data = next(self.stream)

# Set x and y data...

self.scat.set_offsets(data[:, :2])

# Set sizes...

self.scat.set_sizes(300 * abs(data[:, 2])**1.5 + 100)

# Set colors..

self.scat.set_array(data[:, 3])

# We need to return the updated artist for FuncAnimation to draw..

# Note that it expects a sequence of artists, thus the trailing comma.

return self.scat,

if == ‘’:

a = AnimatedScatter()

plt.show()

在此处输入图片说明

如果使用OSX并使用OSX后端,则需要在下面的初始化中将更改blit=True为。OSX后端不完全支持blitting。性能会受到影响,但是示例应在禁用blitting的情况下在OSX上正确运行。blit=FalseFuncAnimation

对于一个仅更新颜色的简单示例,请看以下内容:

import matplotlib.pyplot as plt

import numpy as np

import matplotlib.animation as animation

def main():

numframes = 100

numpoints = 10

color_data = np.random.random((numframes, numpoints))

x, y, c = np.random.random((3, numpoints))

fig = plt.figure()

scat = plt.scatter(x, y, c=c, s=100)

ani = animation.FuncAnimation(fig, update_plot, frames=xrange(numframes),

fargs=(color_data, scat))

plt.show()

def update_plot(i, data, scat):

scat.set_array(data[i])

return scat,

main()

以上是 Python-如何为散点图制作动画? 的全部内容, 来源链接: utcz.com/qa/434453.html

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