coordinate x=start, y=height-30 (where the starting node is)
        'A',                            // This means we're gonna build an elliptical arc
        (start - end)/2, ',',    // Next 2 lines are the coordinates of the inflexion point. Height of this point is proportional with start - end distance
        (start - end)/2, 0, 0, ',',
        start < end ? 1 : 0, end, ',', height-30] // We always want the arc on top. So if end is before start, putting 0 here turn the arc upside down.
        .join(' '