get the y distance . concode_field_sep PlanarEdge next concode_elem_sep PlanarVertex orig concode_elem_sep PlanarEdge prev concode_elem_sep boolean realedge concode_elem_sep double angle concode_elem_sep PlanarEdge twin concode_field_sep double getDX concode_elem_sep PlanarVertex getOrigin concode_elem_sep PlanarVertex getDestination concode_elem_sep double angleCounterClockWise concode_elem_sep double getAngle concode_elem_sep void setNext concode_elem_sep void setTwin concode_elem_sep PlanarEdge getNext concode_elem_sep PlanarEdge getTwin concode_elem_sep PlanarEdge getPrev concode_elem_sep boolean isRealEdge
double function ( ) { return twin . orig . point . y - orig . point . y ; }