Function pack

external/.d3.js:13542–13556

(root)

      padding = constantZero;

  function pack(root) {
    const random = lcg$1();
    root.x = dx / 2, root.y = dy / 2;
    if (radius) {
      root.eachBefore(radiusLeaf(radius))
          .eachAfter(packChildrenRandom(padding, 0.5, random))
          .eachBefore(translateChild(1));
    } else {
      root.eachBefore(radiusLeaf(defaultRadius))
          .eachAfter(packChildrenRandom(constantZero, 1, random))
          .eachAfter(packChildrenRandom(padding, root.r / Math.min(dx, dy), random))
          .eachBefore(translateChild(Math.min(dx, dy) / (2 * root.r)));
    }
    return root;
  }

  pack.radius = function(x) {
    return arguments.length ? (radius = optional(x), pack) : radius;