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