d3.forceLink([links]) Creates a new link force with the specified links and default parameters. If links is

link.distance([distance]) If distance is specified, sets the distance accessor to the specified number or function

simulation.restart() Restarts the simulation’s internal timer and returns the simulation. In conjunction with

link.links([links]) If links is specified, sets the array of links associated with this force, recomputes the

d3.forceSimulation([nodes]) Creates a new simulation with the specified array of

simulation.tick() Increments the current

link.strength([strength]) If strength is specified, sets the strength accessor to the specified number or function

center.y([y]) If y is specified, sets the y-coordinate of the centering position to the specified

simulation.alpha([alpha]) If alpha is specified, sets the current alpha to the specified number in the range