用python注释hexbin图

Question

我正在尝试创建一个交互式的hexbin情节。 用户应该能够遍历每个十六进制并查看注释值。 到目前为止，我无法为hexbin获得正确的注释，但是当对散点图使用相同的方法时，效果很好。 看起来hexbin的事件为触发事件提供了错误的索引，我该如何修复

from matplotlib.pyplot import figure, show
import matplotlib.pyplot as plt
import numpy as np; 
np.random.seed(1)

x = np.random.rand(10)
y = np.random.rand(10)
c = np.random.randint(1,4,size=10)

norm = plt.Normalize(1,4)
cmap = plt.cm.RdYlGn

fig =  figure()
ax = fig.add_subplot(111)
# sc = ax.scatter(x,y,c=c, s=100, cmap=cmap, norm=norm) # this works
sc = ax.hexbin(x, y, C=c,picker=True) 

annot = ax.annotate("", xy=(0,0), xytext=(20,20),textcoords="offset points",
                    bbox=dict(boxstyle="round", fc="w"),
                    arrowprops=dict(arrowstyle="->"))
annot.set_visible(False)

def update_annot(ind):
    pos = sc.get_offsets()[ind["ind"][0]]
    annot.xy = pos
    text = "{}".format(" ".join(list(map(str,c[ind["ind"]]))))
    annot.set_text(text)

def hover(event):
    vis = annot.get_visible()
    if event.inaxes == ax:
        cont, ind = sc.contains(event)
        print(cont)
        print(ind)
        if cont:
            update_annot(ind)
            annot.set_visible(True)
            fig.canvas.draw_idle()
        else:
            if vis:
                annot.set_visible(False)
                fig.canvas.draw_idle()

fig.canvas.mpl_connect("motion_notify_event", hover)
show()