comput rout link fig messag comput connectionpoint figlink port depend action attach owner link fig messag add fig activ move link fig classifi role necessari tigri gef present fig edg comput rout comput rout impl fig sourc fig sourc port fig fig dest fig dest port fig sourc fig fig messag port dest fig fig messag port fig messag port src mp fig messag port sourc fig fig messag port dest mp fig messag port dest fig point start point sourc fig connect point dest mp center point end point dest fig connect point src mp center self messag self messag start point sourc fig center start point sourc fig width end point start point set end point start point end point time laid point add middl point num point insert point start point sequenc diagram layer object distanc start point end point middl point middl start point sequenc diagram layer object distanc middl start point end point point point middl middl set point handl middl middl set end point start point end point calc bound layout edg 