added lifeline-style

gallery/example2.typ

@@ -13,8 +13,8 @@
 
 #chronos.diagram({
   import chronos: *
-  _seq("User", "A", comment: "DoWork", enable-dst: true)
-  _seq("A", "A", comment: "Internal call", enable-dst: true)
+  _seq("User", "A", comment: "DoWork", enable-dst: true, lifeline-style: (fill: rgb("#FFBBBB")))
+  _seq("A", "A", comment: "Internal call", enable-dst: true, lifeline-style: (fill: rgb("#E9967A")))
   _seq("A", "B", comment: [#sym.quote.angle.l createRequest #sym.quote.angle.r], enable-dst: true)
   _seq("B", "A", comment: "RequestCreated", disable-src: true, disable-dst: true, dashed: true)
   _seq("A", "User", comment: "Done", disable-src: true)
@@ -24,8 +24,8 @@
   import chronos: *
   _seq("alice", "bob", comment: "hello", enable-dst: true)
   _seq("bob", "bob", comment: "self call", enable-dst: true)
-  _seq("bill", "bob", comment: "hello from thread 2", enable-dst: true)
-  _seq("bob", "george", comment: "create", enable-dst: true)
+  _seq("bill", "bob", comment: "hello from thread 2", enable-dst: true, lifeline-style: (fill: rgb("#005500")))
+  _seq("bob", "george", comment: "create", create-dst: true)
   _seq("bob", "bill", comment: "done in thread 2", disable-src: true, dashed: true)
   _seq("bob", "bob", comment: "rc", disable-src: true, dashed: true)
   _seq("bob", "george", comment: "delete", destroy-dst: true)

src/renderer.typ

@@ -1,5 +1,5 @@
 #import "@preview/cetz:0.2.2": canvas, draw
-#import "utils.typ": get-participants-i
+#import "utils.typ": get-participants-i, get-style
 #import "group.typ"
 #import "sequence.typ"
 #import "separator.typ"
@@ -209,10 +209,12 @@
 
       // Draw lifeline rectangles (reverse for bottom to top)
       for rect in rects.rev() {
-        let (cx, y0, y1) = rect
+        let (cx, y0, y1, style) = rect
+        let style = get-style("lifeline", style)
         draw.rect(
           (cx - LIFELINE-W / 2, y0),
-          (cx + LIFELINE-W / 2, y1)
+          (cx + LIFELINE-W / 2, y1),
+          ..style
         )
       }
 

src/sequence.typ

@@ -10,10 +10,12 @@
   color: black,
   flip: false,
   enable-dst: false,
+  create-dst: false,
   disable-dst: false,
   destroy-dst: false,
   disable-src: false,
   destroy-src: false,
+  lifeline-style: auto
 ) = {
   return ((
     type: "seq",
@@ -25,10 +27,12 @@
     color: color,
     flip: flip,
     enable-dst: enable-dst,
+    create-dst: create-dst,
     disable-dst: disable-dst,
     destroy-dst: destroy-dst,
     disable-src: disable-src,
     destroy-src: destroy-src,
+    lifeline-style: lifeline-style,
   ),)
 }
 
@@ -45,7 +49,7 @@
   if elmt.disable-src {
     let src-line = lifelines.at(i1)
     src-line.level -= 1
-    src-line.lines.push(("disable", y, auto))
+    src-line.lines.push(("disable", y))
     lifelines.at(i1) = src-line
   }
   if elmt.destroy-src {
@@ -142,7 +146,12 @@
   }
   if elmt.enable-dst {
     let dst-line = lifelines.at(i2)
-    dst-line.lines.push(("enable", y, auto))
+    dst-line.lines.push(("enable", y, elmt.lifeline-style))
+    lifelines.at(i2) = dst-line
+  }
+  if elmt.create-dst {
+    let dst-line = lifelines.at(i2)
+    dst-line.lines.push(("create", y))
     lifelines.at(i2) = dst-line
   }
   y -= Y-SPACE

src/utils.typ

@@ -24,4 +24,20 @@
     }
   }
   return (min-i, max-i)
+}
+
+#let get-style(base-name, mods) = {
+  let style = if base-name == "lifeline" {(
+    fill: white,
+    stroke: black + 1pt
+  )}
+
+  if mods == auto {
+    return style
+  }
+  if type(mods) == dictionary {
+    return style + mods
+  }
+
+  panic("Invalid type for parameter mods, expected auto or dictionary, got " + str(type(mods)))
 }