selective bit mask. !=0 means layout will not move.

specify a width and height of the node's bounding box if you turn on avoidOverlaps

index in nodes array, this is initialized by Layout.start()

specify a width and height of the node's bounding box if you turn on avoidOverlaps

x and y will be computed by layout as the Node's centroid

x and y will be computed by layout as the Node's centroid