First demo commit.

src/entities/Spawner.lua

@@ -0,0 +1,27 @@
+local assets = require "src.assets"
+local Pig = require "src.entities.Pig"
+
+local Spawner = class "Spawner"
+
+Spawner.sprite = assets.img_spawner
+
+function Spawner:init(args)
+	self.pos = {x = args.x + 32, y = args.y + 32}
+	self.offset = {x = 32, y = 32}
+	self.scale = {x = 1, y  = 1}
+	self.rot = 0
+	self.bg = true
+	self.isSpawner = true
+end
+
+function Spawner:update(dt)
+	self.rot = self.rot + 2 * dt
+	local s = math.random() * 0.2 + 0.9
+	self.scale.x, self.scale.y = s, s
+end
+
+function Spawner:spawn()
+	world:add(Pig(self.pos.x - 15, self.pos.y - 10, nil))
+end
+
+return Spawner