code: function (mx, my, q1x1, q1y1, q1x, q1y, q2x1, q2y1, q2x, q2y ) {
            return `M ${mx} ${my} Q ${q1x1} ${q1y1} ${q1x} ${q1y} Q ${q2x1} ${q2y1} ${q2x} ${q2y}`;
          }
docs: Defines how path between nodes are drawn