added short/start/end arrows

src/renderer.typ

@@ -2,10 +2,12 @@
 #import "utils.typ": get-participants-i, get-style
 #import "group.typ"
 #import "participant.typ"
+#import participant: PAR-SPECIALS
 #import "sequence.typ"
 #import "separator.typ"
 #import "consts.typ": *
 
+#let DEBUG-INVISIBLE = false
 
 #let get-columns-width(participants, elements) = {
   participants = participants.map(p => {
@@ -56,8 +58,10 @@
   for i in range(participants.len() - 1) {
     let p1 = participants.at(i)
     let p2 = participants.at(i + 1)
-    let w1 = measure(box(p1.display-name)).width + PAR-PAD.last() * 2
-    let w2 = measure(box(p2.display-name)).width + PAR-PAD.last() * 2
+    let w1 = if p1.invisible {0pt} else {measure(box(p1.display-name)).width}
+    let w2 = if p2.invisible {0pt} else {measure(box(p2.display-name)).width}
+    w1 += PAR-PAD.last() * 2
+    w2 += PAR-PAD.last() * 2
     widths.push(w1 / 2pt + w2 / 2pt + PAR-SPACE)
   }
 
@@ -79,7 +83,7 @@
     let m = measure(cell.cell)
     widths.at(cell.i2 - 1) = calc.max(
       widths.at(cell.i2 - 1),
-      m.width / 1pt - widths.slice(0, cell.i2 - 1).sum()
+      m.width / 1pt - widths.slice(cell.i1, cell.i2 - 1).sum()
     )
   }
 
@@ -115,7 +119,7 @@
   
   // Draw participants (start)
   for p in participants {
-    if p.from-start {
+    if p.from-start and not p.invisible {
       shapes += draw-par(p)
     }
   }
@@ -174,8 +178,26 @@
 
   // Draw vertical lines + lifelines + end participants
   shapes += draw.on-layer(-1, {
-    for (i, p) in participants.enumerate() {
-      let x = x-pos.at(i)
+    if DEBUG-INVISIBLE {
+      for p in participants.filter(p => p.invisible) {
+        let color = if p.name.starts-with("?") {green} else if p.name.ends-with("?") {red} else {blue}
+        let x = x-pos.at(p.i)
+        draw.line(
+          (x, 0),
+          (x, y),
+          stroke: (paint: color, dash: "dotted")
+        )
+        draw.content(
+          (x, 0),
+          p.display-name,
+          anchor: "west",
+          angle: 90deg
+        )
+      }
+    }
+    
+    for p in participants.filter(p => not p.invisible) {
+      let x = x-pos.at(p.i)
 
       // Draw vertical line
       let last-y = 0
@@ -185,7 +207,7 @@
       let lines = ()
 
       // Compute lifeline rectangles + destruction positions
-      for line in lifelines.at(i).lines {
+      for line in lifelines.at(p.i).lines {
         let event = line.first()
         if event == "create" {
           last-y = line.at(1)