Question

在Stackoverflow上，我发现了以下两位代码：

import matplotlib.pyplot as plt
import numpy as np; np.random.seed(1)

x = np.random.rand(15)
y = np.random.rand(15)
names = np.array(list("ABCDEFGHIJKLMNO"))
c = np.random.randint(1,5,size=15)

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

fig,ax = plt.subplots()
sc = plt.scatter(x,y,c=c, s=100, cmap=cmap, norm=norm)

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,ind["ind"]))),
                       " ".join([names[n] for n in ind["ind"]]))
    annot.set_text(text)
    annot.get_bbox_patch().set_facecolor(cmap(norm(c[ind["ind"][0]])))
    annot.get_bbox_patch().set_alpha(0.4)


def picker(event):
    vis = annot.get_visible()
    if event.inaxes == ax:
        cont, ind = sc.contains(event)
        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", picker)

plt.show()

来自Possible to make labels appear when hovering over a point in matplotlib?的

和

import matplotlib.pyplot as plt

def main():
    # Make an example pie plot
    fig = plt.figure()
    ax = fig.add_subplot(111)

    labels = ['Apple', 'Mango', 'Orange']
    wedges, plt_labels = ax.pie([20, 40, 60], labels=labels)
    ax.axis('equal')

    make_picker(fig, wedges)
    plt.show()

def make_picker(fig, wedges):

    def onclick(event):
        wedge = event.artist
        label = wedge.get_label()
        print(label)

# Make wedges selectable
    for wedge in wedges:
        wedge.set_picker(True)

    fig.canvas.mpl_connect('pick_event', onclick)

if __name__ == '__main__':
    main()

来自matplotlib mouseclick event in pie chart。

在第一个代码块中，当鼠标悬停在数据点上时，会创建一个散点图，并且有一个鼠标悬停效果。

在第二个代码中，创建一个饼图，当用户点击图表的楔形时，标签将打印在控制台中。

当我将鼠标悬停在饼图的楔形上时，我想要的是相同的悬停效果。

有没有办法实现这个目标？

将鼠标悬停在饼图中的楔形上时，可以使标签显示为

0 个答案: