This sample is copied from the Concept Map sample and augmented with tokens that traverse the graph, stopping at nodes and travelling along links.

Note that the creation and movement of the tokens is not recorded by the UndoManager.

### GoJS Features in this sample

#### Collections

GoJS provides its own collection classes: List, Set, and Map. You can iterate over a collection by using an Iterator. More information can be found in the GoJS Intro.

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#### Force Directed Layout

This predefined layout treats the graph as if it were a system of physical bodies with forces acting on and between them. The layout iteratively moves nodes and links to minimize the total sum of forces on each node. The resulting layout will normally not contain overlapping Nodes, excluding cases where the graph is densely interconnected. More information can be found in the GoJS Intro.

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#### Animation

GoJS offers several built-in animations, enabled by default, as well as the ability to create arbitrary animations.

The Diagram.animationManager handles animations within a Diagram. The AnimationManager automatically sets up and dispatches default animations, and has properties to customize and disable them. Custom animations are possible by creating instances of Animation or AnimationTrigger. More information can be found in the GoJS Intro.

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