Add weapon charge UI.

src/kani.lua

@@ -8,6 +8,9 @@ import "ui"
 
 local gfx <const> = playdate.graphics
 
+local BASE_CHARGE_FACTOR <const> = 15
+local BASE_WEAPON_CHARGE_SPEED <const> = 1000
+
 -- the amount of charge needed to increase the shot power by 1 at each power level
 local WEAPON_CHARGE_LOOKUP <const> = {
    [0]=5,
@@ -16,9 +19,6 @@ local WEAPON_CHARGE_LOOKUP <const> = {
    [3]=50
 }
 
--- maximum value the reserve charge can reach
-local MAX_CHARGE <const> = 100
-
 class("Kani").extends(gfx.sprite)
 
 function Kani:init(ui)
@@ -30,14 +30,22 @@ function Kani:init(ui)
    self:setGroupMask(0x2)
    self:setCollidesWithGroupsMask(0x19)
 
+   -- stats
+   self.health = 100
    self.reserveCharge = 100
+
+   -- controls the speed the crank recharges the player's reserves. A lower number allows faster charging.
+   -- should never be set to 0
+   self.chargeFactor = BASE_CHARGE_FACTOR
+
+   -- weapon variables
    self.weaponPower = 0
    self.firingMode = false
+   self.weaponChargeSpeed = BASE_WEAPON_CHARGE_SPEED -- speed in ms between weapon charge levels. Level 2 always takes half this time.
 
    -- the UI gets passed in to Kani so that we can update pieces of it easily.
    self.ui = ui
 
-   -- input handlers
    self.inputHandlers = {
       upButtonDown =    function() self.vector.y = -3 end,
       downButtonDown =  function() self.vector.y = 3 end,
@@ -49,7 +57,9 @@ function Kani:init(ui)
       rightButtonUp =   function() self.vector.x = 0 end,
       cranked = function(change, accelChange) self:chargeReserve(change) end,
       AButtonDown = function()
-         self.firingTimer = playdate.timer.keyRepeatTimerWithDelay(500, 1000, self.chargeShot, self)
+         self.firingTimer = playdate.timer.keyRepeatTimerWithDelay(self.weaponChargeSpeed / 2,
+                                                                   self.weaponChargeSpeed,
+                                                                   self.chargeShot, self)
       end,
       AButtonUp = function() self:fire() end,
    }
@@ -57,7 +67,7 @@ end
 
 function Kani:chargeReserve(change)
    if change <= 0 then return end
-   self.reserveCharge = math.min(self.reserveCharge + change / 15, 100)
+   self.reserveCharge = math.min(self.reserveCharge + change / self.chargeFactor, 100)
    self.ui.chargeMeter:setValue(self.reserveCharge)
 end
 
@@ -76,8 +86,8 @@ function Kani:chargeShot()
    if effectiveCharge >= requiredPower then
       self.reserveCharge = effectiveCharge - requiredPower
       self.weaponPower += 1
-      print("Shot charged to size " .. self.weaponPower)
       self.ui.chargeMeter:setValue(self.reserveCharge)
+      self.ui.weaponPowerMeter:setValue(self.weaponPower-1)
    end
 end
 
@@ -88,11 +98,20 @@ function Kani:fire()
       return
    end
 
-   print("Firing bullet of size " .. self.weaponPower)
    local bullet = Bullet(self.weaponPower)
    bullet:moveTo(self.x+16, self.y)
    bullet:add()
    self.weaponPower = 0
+   self.ui.weaponPowerMeter:setValue(0)
+end
+
+function Kani:damage(amount)
+   self.health = math.max(self.health - amount, 0)
+
+   if self.health <= 0 then
+      -- TODO: destroy ship
+   end
+   self.ui.healthMeter:setValue(self.health)
 end
 
 function Kani:addInputHandlers()
@@ -107,6 +126,6 @@ end
 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
+      -- handle player-triggered collisions
    end
 end