_shiftToCenter() {
    const range = NetworkUtil.getRangeCore(
      this.body.nodes,
      this.body.nodeIndices
    );
    const center = NetworkUtil.findCenter(range);
    for (let i = 0; i < this.body.nodeIndices.length; i++) {
      const node = this.body.nodes[this.body.nodeIndices[i]];
      node.x -= center.x;
      node.y -= center.y;
    }
  }
Move all the nodes towards to the center so gravitational pull wil not move the nodes away from view
@private