added synched sequences

gallery/example2.typ

@@ -49,3 +49,38 @@
   _seq("Alice", "?", comment: [->?\ *short* from actor1])
   _seq("Alice", "Bob", comment: [->\ from actor1 to actor2])
 })
+
+#chronos.diagram({
+  import chronos: *
+  _par("alice", display-name: "Alice")
+  _par("bob", display-name: "Bob")
+  _par("craig", display-name: "Craig")
+
+  _seq("bob", "alice")
+  _seq("bob", "craig")
+  _gap()
+  
+  _sync({
+    _seq("bob", "alice")
+    _seq("bob", "craig")
+  })
+  _gap()
+  
+  _seq("alice", "bob")
+  _seq("craig", "bob")
+  _gap()
+  
+  _sync({
+    _seq("alice", "bob")
+    _seq("craig", "bob")
+  })
+  _gap()
+  
+  _sync({
+    _seq("alice", "bob", enable-dst: true)
+    _seq("craig", "bob")
+  })
+  _gap()
+
+  _evt("bob", "disable")
+})

src/lib.typ

@@ -5,3 +5,4 @@
 #import "participant.typ": _par
 #import "separator.typ": _sep
 #import "note.typ": _note
+#import "sync.typ": _sync

src/renderer.typ

@@ -5,6 +5,7 @@
 #import participant: PAR-SPECIALS
 #import "sequence.typ"
 #import "separator.typ"
+#import "sync.typ"
 #import "consts.typ": *
 #import "note.typ" as note: get-note-box
 
@@ -203,6 +204,7 @@
   let draw-sep = separator.render.with(x-pos)
   let draw-par = participant.render.with(x-pos)
   let draw-note = note.render.with(pars-i, x-pos)
+  let draw-sync = sync.render.with(pars-i, x-pos, participants)
   
   // Draw participants (start)
   for p in participants {
@@ -295,6 +297,12 @@
         (y, shps) = draw-note(elmt, y, lifelines)
         shapes += shps
       }
+
+    // Synched sequences
+    } else if elmt.type == "sync" {
+      let shps
+      (y, lifelines, shps) = draw-sync(elmt, y, lifelines)
+      shapes += shps
     }
   }
 

src/sync.typ

@@ -0,0 +1,27 @@
+#import "sequence.typ"
+
+#let _sync(elmts) = {
+  return ((
+    type: "sync",
+    elmts: elmts
+  ),)
+}
+
+#let render(pars-i, x-pos, participants, elmt, y, lifelines) = {
+  let draw-seq = sequence.render.with(pars-i, x-pos, participants)
+
+  let shapes = ()
+
+  let end-y = y
+
+  for e in elmt.elmts {
+    let yi
+    let shps
+    (yi, lifelines, shps) = draw-seq(e, y, lifelines)
+    shapes += shps
+    end-y = calc.min(end-y, yi)
+  }
+
+  let r = (end-y, lifelines, shapes)
+  return r
+}