Initial implementation of player and bullets.

src/kani.lua

@@ -0,0 +1,78 @@
+-- Code for the player's ship.
+import "CoreLibs/object"
+import "CoreLibs/graphics"
+import "CoreLibs/sprites"
+import "bullet"
+
+local gfx <const> = playdate.graphics
+
+class("Kani").extends(gfx.sprite)
+
+function Kani:init()
+   local img = gfx.image.new("images/kani.png")
+   Kani.super.init(self, img)
+   print(self)
+   self:setCollideRect(0, 0, self:getSize())
+   self.vector = {x=0,y=0} -- movement direction
+   self:setGroupMask(0x2)
+   self:setCollidesWithGroupsMask(0x19)
+
+   self.reserveCharge = 0
+   self.shotCharge = 0
+
+   -- input handlers
+   self.inputHandlers = {
+      upButtonDown =    function() self.vector.y = -1 end,
+      downButtonDown =  function() self.vector.y = 1 end,
+      leftButtonDown =  function() self.vector.x = -1 end,
+      rightButtonDown = function() self.vector.x = 1 end,
+      upButtonUp =      function() self.vector.y = 0 end,
+      downButtonUp =    function() self.vector.y = 0 end,
+      leftButtonUp =    function() self.vector.x = 0 end,
+      rightButtonUp =   function() self.vector.x = 0 end,
+      cranked = function(change, accelChange) self:chargeReserve(change) end,
+      AButtonDown = function() self:chargeShot(1) end,
+      AButtonUp = function() self:fire() end,
+   }
+end
+
+function Kani:chargeReserve(change)
+   self.reserveCharge += change / 10
+end
+
+function Kani:chargeShot(amount)
+   if self.reserveCharge > amount then
+      self.shotCharge += amount
+      self.reserveCharge -= amount
+   elseif self.reserveCharge > 0 then
+      self.shotCharge += self.reserveCharge
+      self.reserveCharge = 0
+   end
+end
+
+function Kani:fire()
+   if self.shotCharge <= 0 then
+      return
+   end
+
+   local bullet = Bullet(self.shotCharge)
+   bullet:moveTo(self.x+16, self.y)
+   bullet:add()
+   self.shotCharge = 0
+end
+
+function Kani:addInputHandlers()
+   playdate.inputHandlers.push(self.inputHandlers)
+end
+
+function Kani:removeInputHandlers()
+   playdate.inputHandlers.pop()
+end
+
+-- move that crab!
+function Kani:update()
+   local collisions = select(3, self:moveWithCollisions(self.x + self.vector.x, self.y + self.vector.y))
+   for i=0, #collisions, 1 do
+      -- handle collisions
+   end
+end