http://gist.github.com/

Connector-component.cs

<path d="M @X1 @Y1 C @c1x @c1y, @c2x @c2y, @X2 @Y2" />

@code {
    [Parameter] public Direction Dir1 { get; set; } = Direction.Right;
    [Parameter] public double X1 { get; set; }
    [Parameter] public double Y1 { get; set; }

    [Parameter] public Direction Dir2 { get; set; } = Direction.Left;
    [Parameter] public double X2 { get; set; }
    [Parameter] public double Y2 { get; set; }


    // reference points
    
    double c1x;
    double c1y;

    double c2x;
    double c2y;
    …

    public enum Direction {
        Top,
        Right,
        Bottom,
        Left
    }
    …