Center force directed layout after tick using root node (return to center)

Question

I am experimenting with force directed layout using D3.js. What I need is center the layout by root (or other selected node) and return this node to the svg (e.g. canvas) ce

Answer 1

Try to change the force event handler like this:

force.on("tick", function(e) {
nodes[0].x = w / 2;
nodes[0].y = h / 2;

var k = 0.05 * e.alpha;
          nodes.forEach(function(o, i) {
            o.y += (nodes[0].y - o.y) * k;
            o.x += (nodes[0].x - o.x) * k;
          });

link.attr("x1", function(d) { return d.source.x; })
    .attr("y1", function(d) { return d.source.y; })
    .attr("x2", function(d) { return d.target.x; })
    .attr("y2", function(d) { return d.target.y; });

node.attr("cx", function(d) { return d.x; })
    .attr("cy", function(d) { return d.y; });
 });