don't rely on shallow copy to construct new classes. also multiple ducks

data/scripts/classes/duck.lua

@@ -12,32 +12,34 @@ local States = {
 local WANDER_TIME = 1.0
 local IDLE_TIME = 1.0
 
-local Duck = {
-  position = {},
-  velocity = {},
-  direction = {},
-
-  target = nil,
-  state = States.IDLE,
-
-  wander_timer = 0,
-
-  speed = 0.02,
-  chase_speed = 0.04,
-  accel = 0.5,
-
-  STATES = States,
-
-  AteFeed = Signal.new()
-}
+local Duck = {}
 
 Duck.__index = Duck
 
 function Duck.new(position)
-  local d = util.shallow_copy(Duck)
-  d.position = position
-  d.velocity = Vector3()
-  d.direction = Vector3(0, 0, -1):rotated(Vector3.UP, util.random_float(-math.pi, math.pi))
+  -- local d = util.shallow_copy(Duck)
+  local d = {
+    position = position:copy(),
+    velocity = Vector3(),
+    direction = Vector3(0, 0, -1):rotated(Vector3.UP, util.random_float(-math.pi, math.pi)),
+  
+    target = nil,
+    state = States.IDLE,
+  
+    wander_timer = 0,
+  
+    speed = 0.02,
+    chase_speed = 0.04,
+    accel = 0.5,
+  
+    STATES = States,
+  
+    AteFeed = Signal.new(),
+    SeekFeed = Signal.new(),
+    
+    index = 1,
+  }
+  d.position.y = 0.4
 
   return setmetatable(d, Duck)
 end
@@ -68,6 +70,7 @@ function Duck:wander(delta)
   if self.wander_timer >= WANDER_TIME then
     self.state = States.IDLE
     self.wander_timer = 0
+    self.SeekFeed:emit(self)
     return
   end
 
@@ -96,6 +99,7 @@ end
 
 function Duck:start_chase(feed)
   if self.state == States.CHASE then return end
+  print("duck " .. self.index .. " starting chase")
   self.state = States.CHASE
   self.target = feed
   feed.occupied = true

data/scripts/classes/feed.lua

@@ -2,22 +2,20 @@ local Vector3 = require "types.vector3"
 
 local TEXTURE = "images/tongue.png"
 
-local Feed = {
-  position = {},
-  direction = {},
-  velocity = {},
-  landed = false,
-  occupied = false,
-
-  speed = 0.15,
-}
+local Feed = {}
 
 Feed.__index = Feed
 
-function Feed.new(p_position, p_direction)
-  local f = util.shallow_copy(Feed)
-  f.position = p_position:copy()
-  f.direction = p_direction:copy()
+function Feed.new(position, direction)
+  local f = {
+    position = position:copy(),
+    direction = direction:copy(),
+    velocity = Vector3(),
+    landed = false,
+    occupied = false,
+
+    speed = 0.15,
+  }
   f.velocity = f.direction * f.speed
   f.velocity.y = 0.1