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（769862113）This is an extension and not part of the main GoJS library. Note that the API for this class may change at any time. If you intend to use an extension in production, you should copy the code to your own source directory. Extensions can be found in the GoJS kit under the extensions or extensionsTS folders. See the Extensions intro page for more information.
Gets or sets whether the spiral should go clockwise or counter-clockwise.
The default value is true.
Gets or sets the radius distance.
The default value is NaN.
Gets or sets the spacing between nodes.
The default value is 100.
Copies properties to a cloned Layout.
Compute the effective diameter of a Node.
（769862113）
A custom Layout that lays out a chain of nodes in a spiral.
This layout assumes the graph is a chain of Nodes, spacing controls the spacing between nodes.
If you want to experiment with this extension, try the Spiral Layout sample.