LÖVE 04 - Videoaula em: https://youtu.be/nUzuNJpYx6Y

bullet.lua

Bullet     = {}
Bullet.img = love.graphics.newImage("bullet.png")

function Bullet:create()
	local bullet = {}
	bullet.img   = Bullet.img
	bullet.w     = bullet.img:getWidth()
	bullet.h     = bullet.img:getHeight()
	bullet.x     = Player.x
	bullet.y     = Player.y
	bullet.ox    = bullet.w / 2
	bullet.oy    = bullet.h / 2
	bullet.sx    = 1
	bullet.sy    = 1
	bullet.r     = 0
	bullet.speed = 1000
	bullet.life  = 3
	return bullet
end

function Bullet:update(dt)
	for i, b in ipairs(Player.bullets) do
		b.x    = b.x + b.speed * dt
		b.life = b.life - dt
		if b.life <= 0 then
			table.remove(Player.bullets, i)
		end
	end
end

function Bullet:draw()
	for i, b in ipairs(Player.bullets) do
		love.graphics.draw(b.img, b.x, b.y, b.r, b.sx, b.sy, b.ox, b.oy)
	end
end

conf.lua

function love.conf(t)
	t.version = "0.10.1"
	t.window.title = "Palco:dev()"
	t.window.width = 1000
	t.window.height = 600
	t.window.borderless = false
	t.window.fullscreen = false
end

main.lua

require("player")
require("bullet")

Width  = love.graphics.getWidth()
Height = love.graphics.getHeight()

function love.load()
	-- Define cor de fundo
	love.graphics.setBackgroundColor(5, 70, 110)

	-- Carrega Player
	Player:load()
end

function love.update(dt)
	-- Atualiza Player
	Player:update(dt)
	-- Atualiza bullets
	Bullet:update(dt)
end

function love.draw()
	-- Desenha bullets
	Bullet:draw()

	-- Desenha Player
	Player:draw()

	-- Variáveis de controles
	love.graphics.print("Bullets: "..#Player.bullets)
end

player.lua

Player = {}

function Player:load()
	-- Define "objeto" Player
	self.img     = love.graphics.newImage("player.png")
	self.w       = self.img:getWidth()
	self.h       = self.img:getHeight()
	self.x       = Width / 2
	self.y       = Height / 2
	self.ox      = self.w / 2
	self.oy      = self.h / 2
	self.sx      = 1
	self.sy      = 1
	self.r       = 0
	self.speed   = 300
	self.xvel    = self.speed * math.cos(math.pi / 4)
	self.yvel    = self.speed * math.sin(math.pi / 4)
	self.bullets = {}
	self.cd      = 0.2
	self.canfire = 0
end

function Player:update(dt)
	-- Recebe e computa controles
	if love.keyboard.isDown("w") and love.keyboard.isDown("a") then
		self.y = self.y - self.yvel * dt
		self.x = self.x - self.xvel * dt
	elseif love.keyboard.isDown("a") and love.keyboard.isDown("s") then
		self.y = self.y + self.yvel * dt
		self.x = self.x - self.xvel * dt
	elseif love.keyboard.isDown("s") and love.keyboard.isDown("d") then
		self.y = self.y + self.yvel * dt
		self.x = self.x + self.xvel * dt
	elseif love.keyboard.isDown("d") and love.keyboard.isDown("w") then
		self.y = self.y - self.yvel * dt
		self.x = self.x + self.xvel * dt
	elseif love.keyboard.isDown("w") then
		self.y = self.y - self.speed * dt
	elseif love.keyboard.isDown("a") then
		self.x = self.x - self.speed * dt
	elseif love.keyboard.isDown("s") then
		self.y = self.y + self.speed * dt
	elseif love.keyboard.isDown("d") then
		self.x = self.x + self.speed * dt
	end

	-- Impede que o Player saia da tela
	if self.y < self.h / 2 then
		self.y = self.h / 2
	end
	if self.x < self.w / 2 then
		self.x = self.w / 2
	end
	if self.y > Height - self.h / 2 then
		self.y = Height - self.h / 2
	end
	if self.x > Width - self.w / 2 then
		self.x = Width - self.w / 2
	end

	-- Atira caso clique com o botão esquerdo do mouse e esteja no cooldown
	self.canfire = self.canfire - dt
	if love.mouse.isDown(1) and self.canfire <= 0 then
		self.canfire = self.cd
		self:fire()
	end
end

function Player:draw()
	love.graphics.draw(self.img, self.x, self.y, self.r, self.sx, self.sy, self.ox, self.oy)
end

function Player:fire()
	table.insert(self.bullets, Bullet:create())
end