helper method updat classifi order automat layout edg node type adapt select button line layout self fig poli edg shape fig poli fc content point fc center point sourc fig node sourc fig node point center right point fc center sourc fig node size width fc center yoffset sourc fig node size height edg shape add point fc center fc center edg shape add point center right center right edg shape add point center right center right edg shape add point center right center right yoffset edg shape add point center right center right yoffset place edg layer updat diagram set nearest point edg shape set line color line color edg shape set fill edg shape set complet set fig edg shape 