Add code for repeating waves of enemies, adding intro animations so the enemies can 'fly in', and refactor entity to use a state machine system for more flexibility.

src/enemy/ika.lua

@@ -12,12 +12,15 @@ class("Ika").extends(Entity)
 
 function Ika:init(target)
    Ika.super.init(self, gfx.image.new("images/ika.png"), 25, 1)
-
+   self.target = target
    self:setCollidesWithGroupsMask(0x2)
+   self.type = 'ika'
+end
 
+function Ika:onReady()
    self.weaponTimer = playdate.timer.new(7000,
       function()
-         local b = Bullet(9, 20, self:calculateVector(target))
+         local b = Bullet(9, 20, self:calculateVector(self.target))
          b:moveTo(self.x - (self.width/2) - 1, self.y)
          b:add()
       end
@@ -26,9 +29,12 @@ function Ika:init(target)
 end
 
 function Ika:calculateVector(target)
-   local vec = geom.vector2D.new(0,0)
-   vec.dx = target.x - self.x
-   vec.dy = target.y - self.y
-
+   local vec = geom.point.new(target:getPosition()) -
+      geom.point.new(self:getPosition())
    return vec:normalized() * 3
 end
+
+function Ika:remove()
+   Ika.super.remove(self)
+   if self.weaponTimer then self.weaponTimer:remove() end
+end