如何获取端口、连接详细信息

Question

I am using draw2d with React. I have the node, ports, and connections working. My Questions are

1. How to get the connected ports, am using canvas.
2. How to get the connection path details between ports.
3. Capture click events on the ports.
4. Capture click events on the connections. using new draw2d.Connection({})

versions

 "dependencies": {
   "draw2d": "1.0.19",
   "jquery": "3.4.1",
   "jquery-ui-bundle": "1.12.1-migrate",
   "react": "16.8.6",
   "react-dom": "16.8.6",
   "react-scripts": "2.1.8"
 },