docs: function(reposition) {
      if (reposition) {
        this.reposition();
        this.graph.eachNode(function(node) {
          node.startPos.rho = node.pos.rho = node.endPos.rho;
          node.startPos.theta = node.pos.theta = node.endPos.theta;
        });
      } else {
        this.compute();
      }
      this.plot();
    }