crankani/src/entity.lua

-- A superclass for all player and AI-controlled units
import "CoreLibs/object"
import "CoreLibs/graphics"
import "CoreLibs/sprites"

local gfx <const> = playdate.graphics

class("Entity").extends(gfx.sprite)

function Entity:init(img, health, armor)
   Entity.super.init(self, img)
   self.health = health or 10
   self.armor = armor or 0

   self:setCollideRect(0, 0, self:getSize())

   -- most entities will be enemies, so we configure this mask by default
   -- We don't set a collider mask because collision is a bit too variable
   -- (but we should always include 0x2 and handle player collisions)
   self:setGroupMask(0x4)
end

function Entity:damage(amount)
   if amount < self.armor then return end

   self.health = math.max(self.health - (amount - self.armor), 0)

   if self.health == 0 then
      self:remove()
   end
end