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. See the Extensions intro page for more information.
Optional init: Partial<TreeMapLayout>Gets or sets whether top level Parts are laid out horizontally.
OverridecloneCopies properties to a cloned Layout.
Overridedo
A custom go.Layout that lays out hierarchical data using nested rectangles.
If you want to experiment with this extension, try the TreeMap Layout sample.