Defines the segmentThumb shape of the connector Rhombus - Sets the segmentThumb shape as Rhombus Square - Sets the segmentThumb shape as Square Rectangle - Sets the segmentThumb shape as Rectangle Ellipse - Sets the segmentThumb shape as Ellipse Arrow - Sets the segmentThumb shape as Arrow Diamond - Sets the segmentThumb shape as Diamond OpenArrow - Sets the segmentThumb shape as OpenArrow Circle - Sets the segmentThumb shape as Circle Fletch - Sets the segmentThumb shape as Fletch OpenFetch - Sets the segmentThumb shape as OpenFetch IndentedArrow - Sets the segmentThumb shape as Indented Arrow OutdentedArrow - Sets the segmentThumb shape as Outdented Arrow DoubleArrow - Sets the segmentThumb shape as DoubleArrow