Matplotlib动画多边形 [英] Matplotlib Animation Polygons

问题描述

我使用matplotlib，试图将animate函数与多边形一起使用，以使其在平面中旋转。

Using matplotlib, I am trying to use the animate function with a polygon, to rotate it in the plane.

下面粘贴的代码仅绘制第一个多边形，但是动画不起作用。

The code pasted below only draws the first polygon but the animation doesn't work.

有人可以发现 animate 函数的问题吗？

Can someone spot what's wrong in the animate function?

import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
from matplotlib.patches import Polygon
fig = plt.figure()
fig.set_dpi(100)
fig.set_size_inches(7, 6.5)

ax = plt.axes(xlim=(-30, 30), ylim=(-30, 30))


pts = [[0.,0.], [2.,0.], [9.6,7.6], [9.6,9.6]]


patch = plt.Polygon(pts,closed=None, fill=None, edgecolor='r')
def init():
    patch.pts = [[0.,0.], [2.,0.], [9.6,7.6], [9.6,9.6]]
    ax.add_patch(patch)
    return patch,

def animate(i):

    x1=0.+ 10. * np.sin(np.radians(i))
    x2=2.+ 10. * np.sin(np.radians(i))
    x3=9.6+ 10. * np.sin(np.radians(i))
    x4=9.6+ 10. * np.sin(np.radians(i))

    y1=0.+ 10. * np.cos(np.radians(i))
    y2=0.+ 10. * np.cos(np.radians(i))
    y3=7.6+ 10. * np.cos(np.radians(i))
    y4=9.6+ 10. * np.cos(np.radians(i))


    patch.pts = [[x1,y1], [x2,y2], [x3,y3], [x4,y4]]


    return patch,


anim = animation.FuncAnimation(fig,animate,init_func=init,frames=36,interval=1000,blit=True)


plt.show()

推荐答案

行：

patch.pts = [[x1,y1], [x2,y2], [x3,y3], [x4,y4]]

不更新多边形的顶点。您可以使用set_xy更改顶点：

does not update the vertices of the polygon. You can use set_xy to change the vertices:

patch.set_xy([[x1,y1], [x2,y2], [x3,y3], [x4,y4]])

这将使每个图的变化迭代。 Matplotlib艺术家文档具有更多信息。

This will make the plot change on each iteration. The Matplotlib artists documentation has more information.

看起来形状仍然没有旋转。这与您使用的坐标有关。

It still doesn't look like the shape is rotating. That's something to do with the coordinates you're using.

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