如何使用Python设置多边形（由数组定义）的动画&；Matplotlib

你好

问题解释： 我想设置一个多边形的动画，该多边形的值是我从一个数组接收的（在我的简单示例中，它是一个移动的sqaure）。我想保持多边形的x和y值可变。不要担心多边形的运动。这只是一个例子。需要在来自“”的解决方案中使用类似的“set_xy（）”

目标->在每个动画帧中，我要从数组（P1x，P1y，P2x，P2y，…）加载多边形值并更新图形

问题： 在我的代码中，我仍然存在使用补丁的问题。我正在尝试用索引I更新多边形值。如何定义修补程序？这必须在动画调用之前完成吗

import matplotlib.pyplot as plt
import numpy as np
import matplotlib.animation as animation
import matplotlib.patches as patches

fig = plt.figure()
ax = fig.add_subplot(111)
ax.set_xlim(-10,10)
ax.set_ylim(-10,10)

P1x=[0.0,0.5,1.0,1.5,2.0,2.5,3.0]
P1y=[0.0,0.0,0.0,0.0,0.0,0.0,0.0]
P2x=[1.0,1.5,2.0,2.5,3.0,3.5,4.0]
P2y=[0.0,0.0,0.0,0.0,0.0,0.0,0.0]
P3x=[1.0,1.5,2.0,2.5,3.0,3.5,4.0]
P3y=[1.0,1.0,1.0,1.0,1.0,1.0,1.0]
P4x=[0.0,0.5,1.0,1.5,2.0,2.5,3.0]
P4y=[1.0,1.0,1.0,1.0,1.0,1.0,1.0]

def init():
    return patch,

def animate(i):
    v = np.array([
                [P1x[i],  P1y[i]],  
                [P2x[i],  P2y[i]],  
                [P3x[i],  P3y[i]],
                [P4x[i],  P4y[i]]
                ])
    patch=patches.Polygon(v,closed=True, fc='r', ec='r')

    return patch,

ani = animation.FuncAnimation(fig, animate, np.arange(1, 5), init_func=init,
                              interval=1000, blit=True)
plt.show()

---

非常感谢你的帮助

是的，您需要首先创建多边形并将其添加到轴。在动画功能中，您可以使用面片的

patch.set_xy（）

方法来更新多边形的顶点

import matplotlib.pyplot as plt
import numpy as np
import matplotlib.animation as animation
import matplotlib.patches as patches

fig = plt.figure()
ax = fig.add_subplot(111)
ax.set_xlim(-10,10)
ax.set_ylim(-10,10)

P1x=[0.0,0.5,1.0,1.5,2.0,2.5,3.0]
P1y=[0.0,0.0,0.0,0.0,0.0,0.0,0.0]
P2x=[1.0,1.5,2.0,2.5,3.0,3.5,4.0]
P2y=[0.0,0.0,0.0,0.0,0.0,0.0,0.0]
P3x=[1.0,1.5,2.0,2.5,3.0,3.5,4.0]
P3y=[1.0,1.0,1.0,1.0,1.0,1.0,1.0]
P4x=[0.0,0.5,1.0,1.5,2.0,2.5,3.0]
P4y=[1.0,1.0,1.0,1.0,1.0,1.0,1.0]

P = np.concatenate((np.array([P1x, P2x, P3x, P4x]).reshape(4,1,len(P1x)),
                    np.array([P1y, P2y, P3y, P4y]).reshape(4,1,len(P1x))), axis=1)

patch = patches.Polygon(P[:,:,0],closed=True, fc='r', ec='r')
ax.add_patch(patch)

def init():
    return patch,

def animate(i):
    patch.set_xy(P[:,:,i])
    return patch,

ani = animation.FuncAnimation(fig, animate, np.arange(P.shape[2]), init_func=init,
                              interval=1000, blit=True)
plt.show()

---

是的，您需要首先创建多边形并将其添加到轴。在动画功能中，您可以使用面片的

patch.set_xy（）

方法来更新多边形的顶点

import matplotlib.pyplot as plt
import numpy as np
import matplotlib.animation as animation
import matplotlib.patches as patches

fig = plt.figure()
ax = fig.add_subplot(111)
ax.set_xlim(-10,10)
ax.set_ylim(-10,10)

P1x=[0.0,0.5,1.0,1.5,2.0,2.5,3.0]
P1y=[0.0,0.0,0.0,0.0,0.0,0.0,0.0]
P2x=[1.0,1.5,2.0,2.5,3.0,3.5,4.0]
P2y=[0.0,0.0,0.0,0.0,0.0,0.0,0.0]
P3x=[1.0,1.5,2.0,2.5,3.0,3.5,4.0]
P3y=[1.0,1.0,1.0,1.0,1.0,1.0,1.0]
P4x=[0.0,0.5,1.0,1.5,2.0,2.5,3.0]
P4y=[1.0,1.0,1.0,1.0,1.0,1.0,1.0]

P = np.concatenate((np.array([P1x, P2x, P3x, P4x]).reshape(4,1,len(P1x)),
                    np.array([P1y, P2y, P3y, P4y]).reshape(4,1,len(P1x))), axis=1)

patch = patches.Polygon(P[:,:,0],closed=True, fc='r', ec='r')
ax.add_patch(patch)

def init():
    return patch,

def animate(i):
    patch.set_xy(P[:,:,i])
    return patch,

ani = animation.FuncAnimation(fig, animate, np.arange(P.shape[2]), init_func=init,
                              interval=1000, blit=True)
plt.show()

---

@Bazingaai重新打开，因为显示了如何更新修补程序集合。但这里只有一个补丁。所以对于这个简单的任务来说，集合太复杂了。@Bazingaa我重新打开了，因为显示了如何更新补丁集合。但这里只有一个补丁。因此，对于这个简单的任务来说，集合太复杂了。