This sample integrates GoJS as a layer above the Leaflet mapping library. This demonstrates how to use GoJS within a GIS application by displaying a Diagram of nodes and links atop the map, using latitude and longitude for their coordinates.
You can pan and zoom with Leaflet, and select and drag with GoJS. The GoJS div is on top of the Leaflet map, but this sample selectively bubbles events to leaflet by using a custom Tool. Dragged nodes will update their latitude and longitude data in the Diagram.model.
This diagram displays a few train stations and routes in France, Belgium, and the UK. The data is only meant as an example of using GoJS and is not meant to be accurate.
Note that the map is fetched through the Mapbox API. Access tokens can expire, and you'll need to get your own token.