2014-03-26 77 views
0

使用matplotlib,我试图使用带有多边形的动画函数在平面中旋转它。Matplotlib动画多边形

下面粘贴的代码只绘制第一个多边形,但动画不起作用。

有人可以发现animate函数有什么问题吗?

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() 

回答

1

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:

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

这将使每个迭代的绘图发生变化。 Matplotlib artists documentation有更多信息。

它仍然看起来不像形状在旋转。这与你使用的坐标有关。