有没有办法在两个 lon, lat 对与 Scattergeo 之间的线上设置一个悬停文本

如何解决有没有办法在两个 lon, lat 对与 Scattergeo 之间的线上设置一个悬停文本

我正在绘制航空公司路线图，并希望在起点和目的地之间的线上显示一个悬停文本。例如连接 JFK 与 SFO 的曲线应在显示“JFK-SFO/38 航班”的行显示悬停文本

解决方法

我根据 plotly 图形库中的示例添加了悬停文本。可以在 here 找到参考页面。不幸的是，由于某种原因，将悬停文本的位置设置为行的中心不起作用。如果您将鼠标移动到机场起点一侧，文本将以所需的格式显示。

import plotly.graph_objects as go
import pandas as pd

df_flight_paths = pd.read_csv('https://raw.githubusercontent.com/plotly/datasets/master/2011_february_aa_flight_paths.csv')
df_flight_paths.head()

start_lat   start_lon   end_lat     end_lon     airline     airport1    airport2    cnt
0   32.895951   -97.037200  35.040222   -106.609194     AA  DFW     ABQ     444
1   41.979595   -87.904464  30.194533   -97.669872  AA  ORD     AUS     166
2   32.895951   -97.037200  41.938874   -72.683228  AA  DFW     BDL     162
3   18.439417   -66.001833  41.938874   -72.683228  AA  SJU     BDL     56
4   32.895951   -97.037200  33.562943   -86.753550  AA  DFW     BHM     168

fig = go.Figure()
flight_paths = []
for i in range(len(df_flight_paths)):
    fig.add_trace(
        go.Scattergeo(
            locationmode = 'USA-states',lon = [df_flight_paths['start_lon'][i],df_flight_paths['end_lon'][i]],lat = [df_flight_paths['start_lat'][i],df_flight_paths['end_lat'][i]],mode = 'lines',line = dict(width = 1,color = 'red'),hoverinfo='text',text=df_flight_paths.loc[i,'airport1'] + '-' + df_flight_paths.loc[i,'airport2'] +'/' + str(df_flight_paths.loc[i,'cnt']) + 'flights',textposition='top center',opacity = float(df_flight_paths['cnt'][i]) / float(df_flight_paths['cnt'].max()),)
    )

    
fig.update_layout(
    title_text = 'Feb. 2011 American Airline flight paths<br>(Hover for airport names)',showlegend = False,width=1000,height=800,geo = dict(
        scope = 'north america',projection_type = 'azimuthal equal area',showland = True,landcolor = 'rgb(243,243,243)',countrycolor = 'rgb(204,204,204)',),)
fig.show()