1) 命令:

//cover a split/join pattern into canvas

pmb.Cover("003", "005",

  VertexBuilder.CreateSplit(GatewayDirectionEnum.AndSplit,"AndSplit", "AndSplicCode"),                    
  VertexBuilder.CreateJoin(GatewayDirectionEnum.AndJoin, "AndJoin", "AndJoinCode"),                    
  VertexBuilder.CreateTask("branchTask001", "b001"),

  VertexBuilder.CreateTask("branchTask002", "b002")

  )

  .Update();

2) 命令执行后的图形示例: 

https://img2018.cnblogs.com/blog/808949/201911/808949-20191129153641090-398380998.png