ludic.wildlife, ludic.npc (18.3): a crowd walker carries its walker's id (set_crowd(a, id), -1 off)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/ludic.npc/defs.ludic

@@ -53,6 +53,7 @@ export property NpcPerson {
   wtz: float = 0.0
   way_t: float = 0.0           # seconds until it asks the way again
   crowd: bool = false          # walked by the world's crowd (phase 18): it decides, the crowd moves it
+  crowd_id: int = -1           # its walker in that crowd, the world's number for it
   goal_x: float = 0.0          # where it walks this tick and how fast (0 standing): what a crowd is handed
   goal_z: float = 0.0
   goal_speed: float = 0.0

packages/ludic.npc/tests/way_test.ludic

@@ -87,7 +87,7 @@ program NpcWayTest {
     npc_tests_fake_st.fk_want = 1
     let p = npc_spawn(npc_st, NPCK_HIKER)
     npc_set_at(p, 0.0, 0.0)
-    npc_set_crowd(p, true)
+    npc_set_crowd(p, 0)
     npc_go(npc_st, p, 38.0, -25.0, NPCA_SIT, 30.0)
     for k in 0 .. 60 { npc_tick(npc_st, 0.05) }
     expect_eq(p.x, 0.0)

packages/ludic.npc/way.ludic

@@ -64,7 +64,10 @@ function np_crowd_want(p: NpcPerson, speed: float) -> void {
   p.goal_z = p.tz
   p.goal_speed = speed
 }
-export function npc_set_crowd(p: NpcPerson, on: bool) -> void { p.crowd = on }
+export function npc_set_crowd(p: NpcPerson, id: int) -> void {
+  p.crowd_id = id
+  p.crowd = id >= 0
+}
 export function npc_moved(p: NpcPerson, x: float, z: float, vx: float, vz: float) -> void {
   let dx = x - p.x
   let dz = z - p.z

packages/ludic.wildlife/animal.ludic

@@ -45,6 +45,7 @@ export property WildAnimal {
   wz: float = 0.0
   way_t: float = 0.0      # seconds until it asks the way again; 0 asks at once
   crowd: bool = false     # walked by the world's crowd (phase 18): it decides, the crowd moves it
+  crowd_id: int = -1      # its walker in that crowd, the world's number for it
   goal_x: float = 0.0     # where it walks this tick and how fast: what a crowd is handed
   goal_z: float = 0.0
   goal_speed: float = 0.0

packages/ludic.wildlife/tests/crowd_test.ludic

@@ -42,7 +42,7 @@ program WildCrowdTest {
     wildlife_tests_fake_st.fk_px[0] = 400.0
     wildlife_tests_fake_st.fk_pz[0] = 0.0
     wildlife_tests_fake_st.fk_hidden = true
-    wildlife_set_crowd(a, true)
+    wildlife_set_crowd(a, 0)
     return a
   }
 

packages/ludic.wildlife/walked.ludic

@@ -23,8 +23,11 @@ function wl_crowd_step(a: WildAnimal) -> bool {
   return true
 }
 
-# walked by a crowd, or by its own step again (off, it keeps where the crowd left it)
+# walked by a crowd as its walker `id`, or by its own step again with -1 (it keeps where it was left)
-export function wildlife_set_crowd(a: WildAnimal, on: bool) -> void { a.crowd = on }
+export function wildlife_set_crowd(a: WildAnimal, id: int) -> void {
+  a.crowd_id = id
+  a.crowd = id >= 0
+}
 
 # where the crowd put a walker, and how fast it went: its place, its heading from its velocity, its
 # ground from the world's, and its prints as it goes