added participant creation

src/renderer.typ

@@ -1,6 +1,7 @@
 #import "@preview/cetz:0.2.2": canvas, draw
 #import "utils.typ": get-participants-i, get-style
 #import "group.typ"
+#import "participant.typ"
 #import "sequence.typ"
 #import "separator.typ"
 #import "consts.typ": *
@@ -106,17 +107,17 @@
   for width in widths {
     x-pos.push(x-pos.last() + width)
   }
+
+  let draw-seq = sequence.render.with(pars-i, x-pos, participants)
+  let draw-group = group.render.with()
+  let draw-sep = separator.render.with(x-pos)
+  let draw-par = participant.render.with(x-pos)
   
   // Draw participants (start)
-  for (i, p) in participants.enumerate() {
-    shapes += draw.content(
-      (x-pos.at(i), 0),
-      p.display-name,
-      name: p.name,
-      frame: "rect",
-      padding: PAR-PAD,
-      anchor: "south"
-    )
+  for p in participants {
+    if p.from-start {
+      shapes += draw-par(p)
+    }
   }
 
   let y = -Y-SPACE
@@ -126,10 +127,6 @@
     lines: ()
   ))
 
-  let draw-seq = sequence.render.with(pars-i, x-pos)
-  let draw-group = group.render.with()
-  let draw-sep = separator.render.with(x-pos)
-
   // Draw elemnts
   for elmt in elements {
     // Sequences
@@ -181,11 +178,7 @@
       let x = x-pos.at(i)
 
       // Draw vertical line
-      draw.line(
-        (x, 0),
-        (x, y),
-        stroke: (dash: "dashed", paint: gray.darken(40%))
-      )
+      let last-y = 0
 
       let rects = ()
       let destructions = ()
@@ -194,19 +187,45 @@
       // Compute lifeline rectangles + destruction positions
       for line in lifelines.at(i).lines {
         let event = line.first()
-        if event == "enable" {
+        if event == "create" {
+          last-y = line.at(1)
+
+        } else if event == "enable" {
+          if lines.len() == 0 {
+            draw.line(
+              (x, last-y),
+              (x, line.at(1)),
+              stroke: (dash: "dashed", paint: gray.darken(40%))
+            )
+          }
           lines.push(line)
         
         } else if event == "disable" or event == "destroy" {
-          let l = lines.pop()
-          let lvl = lines.len()
-          rects.push((x + lvl * LIFELINE-W / 2, l.at(1), line.at(1)))
+          let lvl = 0
+          if lines.len() != 0 {
+            let l = lines.pop()
+            lvl = lines.len()
+            rects.push((
+              x + lvl * LIFELINE-W / 2,
+              l.at(1),
+              line.at(1),
+              l.at(2)
+            ))
+            last-y = line.at(1)
+          }
+
           if event == "destroy" {
             destructions.push((x + lvl * LIFELINE-W / 2, line.at(1)))
           }
         }
       }
 
+      draw.line(
+        (x, last-y),
+        (x, y),
+        stroke: (dash: "dashed", paint: gray.darken(40%))
+      )
+
       // Draw lifeline rectangles (reverse for bottom to top)
       for rect in rects.rev() {
         let (cx, y0, y1, style) = rect