This "friend wheel" demonstrates the use of CircularLayout. The layout has been customized to make sure each node is considered to have a fixed diameter, ignoring the size of any TextBlock.
The custom layout also rotates each Node according to the actual angle at which the node was positioned. This information is available on the CircularVertex used by the LayoutNetwork that the CircularLayout constructs from the nodes and links of the diagram. Furthermore, when laying out the nodes it also flips the angle of the TextBlock so that the text is not upside-down.
GraphObject.mouseEnter and GraphObject.mouseLeave event handlers on the Node template highlight both the Node and all of the Links that connect with the Node. The same event handlers on the Links highlight that Link and both connected Nodes. Changes made in these event handlers automatically are not recorded in the UndoManager, although this sample does not enable the UndoManager anyway.
This predefined layout is used for placing Nodes in a cirular or elliptical arrangement. More information can be found in the GoJS Intro.
GoJS allows for the creation of custom layouts to meet specific needs.
There are also many layouts that are extensions -- not predefined in the go.js or go-debug.js library,
but available as source code in one of the three extension directories, with some documentation and corresponding samples.
More information can be found in the GoJS Intro.