使用线连接 scatter_mapbox 上的坐标，但仅从原点连接

Question

我正在创建一个使用带有散点图框的线连接坐标的地图。使用here的示例，我已经能够将每个坐标相互连接。

但是，我只想将“Key”列下具有“Destination”值的坐标连接到数据集中同一列具有“Origin”值的一个坐标。

这是我的数据：

import pandas as pd

lat_dest = [21.028321, 10.426675, 10.776390,-35.297591,21.028321]
lon_dest = [105.854022,-75.544342,106.701139,149.101268,105.854022]
locations = ['Hanoi, Vietnam','Cartagena, Colombia','Ho Chi Minh City, Vietnam','Canberra, Australia','Hanoi, Vietnam']
dest_key = ['Destination','Destination','Destination','Destination','Origin']

test_df = pd.DataFrame({
  'lat': lat_dest,
  'lon': lon_dest,
  'name': locations,
  'key':dest_key
})
 

这是地图：

import plotly.express as px
import plotly.graph_objects as go

fig = px.scatter_mapbox(
    test_df, 
    lat="lat", lon="lon", 
    color="key",
    zoom=2,
    center = {"lat": orig_lat, "lon": orig_lon})

fig.update_layout(
    mapbox_style="carto-positron",
    margin={"r":0,"t":0,"l":0,"b":0},
    showlegend=False
)

fig.add_trace(go.Scattermapbox(
    mode = "lines",
    lon = new_df['lon_dest'],
    lat = new_df['lat_dest']
))