                      0,
                                radius,
                                radius
                              )
                            )
                            .add(
                              new go.PathSegment(go.SegmentType.Line, pv.x - radius, pv.y - radius)
                            )
                            .add(
                              new go.PathSegment(
                                go.SegmentType.Arc,
                                av,
          