crankani/src/bullet.lua

-- Code for bullets!
import "CoreLibs/object"
import "CoreLibs/graphics"
import "CoreLibs/sprites"

local gfx <const> = playdate.graphics

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

function Bullet:init(size, friendly)
   local img = gfx.image.new(size, size)
   gfx.pushContext(img)
     gfx.fillCircleInRect(0, 0, size, size)
   gfx.popContext()

   Bullet.super.init(self, img)
   self:setCollideRect(0, 0, self:getSize())

   local friendly = friendly or true
   if friendly then
      self:setGroupMask(0x4)
      self:setCollidesWithGroupsMask(0x9)
      self.direction = 1
   else
      self:setGroupMask(0x10)
      self:setCollidesWithGroupsMask(0x2)
      self.direction = -1
   end
end

function Bullet:update()
   self:moveWithCollisions(self.x+self.direction, self.y)
end