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（769862113）Gets or sets the electrical charge for this vertex. The default value is NaN.
Gets or sets the cumulative force on the vertex in the X direction. The default value is zero.
Gets or sets the cumulative force on the vertex in the Y direction. The default value is zero.
Gets or sets whether the vertex may be moved by any forces. The default value is false.
Gets or sets the gravitational mass for this vertex. The default value is NaN.
（769862113）
This holds ForceDirectedLayout-specific information about Nodes.
This class inherits from LayoutVertex.