This sample integrates GoJS as a layer in front of 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.

### GoJS Features in this sample

#### ToolTips

A tooltip is an Adornment that is shown when the mouse hovers over an object that has its GraphObject.toolTip set. The tooltip part is bound to the same data as the part itself.

It is typical to implement a tooltip as a "ToolTip" Panel holding a TextBlock or a Panel of TextBlocks and other objects. Each "ToolTip" is just an "Auto" Panel Adornment that is shadowed, and where the border is a rectangular Shape with a light gray fill. However you can implement the tooltip as any arbitrarily complicated Adornment.

More information can be found in the GoJS Intro.

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#### Tools

Tools handle all input events, such as mouse and keyboard interactions, in a Diagram. There are many kinds of predefined Tool classes that implement all of the common operations that users do.

For flexibility and simplicity, all input events are canonicalized as InputEvents and redirected by the diagram to go to the Diagram.currentTool. By default the Diagram.currentTool is an instance of ToolManager held as the Diagram.toolManager. The ToolManager implements support for all mode-less tools. The ToolManager is responsible for finding another tool that is ready to run and then making it the new current tool. This causes the new tool to process all of the input events (mouse, keyboard, and touch) until the tool decides that it is finished, at which time the diagram's current tool reverts back to the Diagram.defaultTool, which is normally the ToolManager, again.

More information can be found in the GoJS Intro.

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