Sample diagams

simple diagram

seqdiag {
  browser  -> webserver [label = "GET /index.html"];
  browser <-- webserver;
  browser  -> webserver [label = "POST /blog/comment"];
              webserver  -> database [label = "INSERT comment"];
              webserver <-- database;
  browser <-- webserver;
}

None

edge types

seqdiag {
  // normal edge and doted edge
  A -> B [label = "normal edge"];
  B --> C [label = "dotted edge"];

  B <-- C [label = "return dotted edge"];
  A <- B [label = "return edge"];

  // asynchronus edge
  A ->> B [label = "asynchronus edge"];
  B -->> C [label = "asynchronus dotted edge"];

  B <<-- C [label = "return asynchronus doted edge"];
  A <<- B [label = "return asynchronus edge"];

  // self referenced edge
  A -> A [label = "self reference edge"];
}

None

attributes of edges

New in version 0.2.2: color attribute

New in version 0.5.0: failed attribute

seqdiag {
  // edge label
  A -> B [label = "call"];
  A <- B [label = "return"];

  // diagonal edge
  A -> B [diagonal, label = "diagonal edge"];
  A <- B [diagonal, label = "return diagonal edge"];

  // color of edge
  A -> B [label = "colored label", color = red];

  // failed edge
  A -> B [label = "failed edge", failed];
}

None

auto return edge and nested sequense

seqdiag {
  // auto return edge
  A => B [label = "call", return = "return"];

  // nested auto return edge
  A => B => C [label = "call", return = "return"];

  // nested sequence
  A => B [label = "nested call"]{
     B => C [label = "call 1"];
     B => D [label = "call 2"];
     B => E [label = "call 3"];
  }
}

None

separators

New in version 0.5.0.

seqdiag {
  A -> B;

  // Separator
  === Separator line ===

  A -> B;

  // Delay separator
  ... Separator line ...

  A -> B;
}

None

edge notes

New in version 0.6.0.

seqdiag {
  // Use note (put note on rightside)
  browser -> webserver [note = "request\nGET /"];
  browser <- webserver;

  // Use leftnote and rightnote
  browser -> webserver [leftnote = "send request"];
  browser <- webserver [rightnote = "send response"];
}

None

diagram attributes

New in version 0.2.0.

New in version 0.5.0: activation and autonumber attributes

New in version 0.6.0: default_note_color attribute

seqdiag {
  // Set edge metrix.
  edge_length = 300;  // default value is 192
  span_height = 80;  // default value is 40

  // Set fontsize.
  default_fontsize = 16;  // default value is 11

  // Do not show activity line
  activation = none;

  // Numbering edges automaticaly
  autonumber = True;

  // Change note color
  default_note_color = lightblue;

  browser  -> webserver [label = "GET \n/index.html"];
  browser <-- webserver [note = "Apache works!"];
}

None

TIPS: changing order of elements

If you want to changing order of elements, define elements you want to layout. seqdiag sorts elements by order they appear.

seqdiag {
  # define order of elements
  # seqdiag sorts elements by order they appear
  browser; database; webserver;

  browser  -> webserver [label = "GET /index.html"];
  browser <-- webserver;
  browser  -> webserver [label = "POST /blog/comment"];
              webserver  -> database [label = "INSERT comment"];
              webserver <-- database;
  browser <-- webserver;
}

None