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（769862113）This constructs an edge that does not know about any Link.
For virtualized layouts working on model data instead of a Link.
Gets or sets the LayoutVertex that this edge comes from. Setting this property does not change any LayoutVertex.destinationEdges collection.
Gets the LayoutNetwork that owns this edge. The default value is null. It is set automatically for you in LayoutNetwork.createEdge.
Gets or sets the LayoutVertex that this edge goes to. Setting this property does not change any LayoutVertex.sourceEdges collection.
Commits the route of this edge to the corresponding Link, if any. By default this does nothing. Please read the Introduction page on Extensions for how to override methods and how to call this base method.
Returns the edge's vertex at the other of this edge from the given vertex.
（769862113）
An edge represents a Link in a LayoutNetwork, along with its fromVertex and toVertex. The link property may be null for edges that represent "dummy" links, when the layout wants to work with a network that is not isomorphic with the collection of Nodes and Links being laid out.
It holds layout-specific data for the link. For each kind of layout that uses a LayoutNetwork there is a subclass of LayoutVertex and a subclass of LayoutEdge:
Modifying a LayoutNetwork or a LayoutVertex or a LayoutEdge does not invalidate the Layout or raise any changed events.