The resulting edge inside the Voronoi diagram.
id:Int
The unique ID/Index of the edge.
lCell:Null<Cell>
The left-hand cell along the edge.
lPoint:Point
The left-hand seed point.
rCell:Null<Cell>
The right-hand cell along the edge.
rPoint:Point
The right-hand seed point.
va:Null<Point>
The first position of the edge segment.
vb:Null<Point>
The second position of the edge segment.