extract asteroids ctor

asteroids/actors.lua

@@ -0,0 +1,32 @@
+local phys = require("phys")
+local inspect = require("inspect")
+
+local actors = {}
+
+function actors.buildActors(game)
+    local asteroids = {}
+    local asteroids_mt = { __index = asteroids }
+
+    function asteroids.new(asteroid)
+        local stage = game.asteroids.stages[asteroid.stage or #game.asteroids.stages]
+        local instance = {
+            angle = math.random() * phys.tau,
+            speed = stage.speed,
+            facing = math.random() * phys.tau,
+            spin = (math.random() - 0.5),
+            radius = stage.radius,
+            sprite = stage.sprite,
+        }
+        for k, v in pairs(asteroid) do
+            instance[k] = v
+        end
+        setmetatable(instance, asteroids_mt)
+        return instance
+    end
+
+    return {
+        asteroids = asteroids,
+    }
+end
+
+return actors

asteroids/main.lua

@@ -1,6 +1,7 @@
 local love = require("love")
 local phys = require("phys")
 local inspect = require("inspect")
+local actors = require("actors")
 
 local function initGame()
     return {
@@ -38,6 +39,8 @@ end
 local game = initGame()
 
 local function initState()
+    ---@diagnostic disable-next-line: redefined-local
+    local actors = actors.buildActors(game)
     local asteroids = {
         {
             x = 100,
@@ -52,15 +55,8 @@ local function initState()
             y = game.height - 100,
         }
     }
-    for _, asteroid in ipairs(asteroids) do
-        asteroid.angle = love.math.random() * phys.tau
-        asteroid.stage = #game.asteroids.stages
-        local stage = game.asteroids.stages[asteroid.stage]
-        asteroid.speed = stage.speed
-        asteroid.facing = math.random() * phys.tau
-        asteroid.spin = 0.1 + math.random() * 0.1
-        asteroid.radius = stage.radius
-        asteroid.sprite = stage.sprite
+    for i, template in ipairs(asteroids) do
+        asteroids[i] = actors.asteroids.new(template)
     end
     local joystick = nil
     if love.joystick.getJoystickCount() == 1 then
@@ -68,6 +64,7 @@ local function initState()
     end
     return {
         debug = true,
+        actors = actors,
         ship = {
             x = game.width / 2,
             y = game.height / 2,