LÖVE 06 - VIdeoaula no link: https://youtu.be/pPiAtW-iDJ4

bullet.lua

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

function Bullet:create()
	local bullet = {}
	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
	-- Calcula direção da bala
	bullet.dir   = {x = love.mouse.getX() - bullet.x, y = love.mouse.getY() - bullet.y}
	local norma  = (bullet.dir.x ^ 2 + bullet.dir.y ^ 2) ^ 0.5
	bullet.dir.x = bullet.dir.x / norma
	bullet.dir.y = bullet.dir.y / norma

	return bullet
end

function Bullet:update(dt)
	for i, b in ipairs(Player.bullets) do
		-- Atualiza posição da bala
		b.x    = b.x + (b.speed * b.dir.x * dt)
		b.y    = b.y + (b.speed * b.dir.y * dt)
		-- Destroi balas que existem há tempo de mais
		b.life = b.life - dt
		if b.life <= 0 then
			table.remove(Player.bullets, i)
		end
	end
end

function Bullet:draw()
	-- Desenha todas as balas
	for i, b in ipairs(Player.bullets) do
		love.graphics.draw(Bullet.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

HC = require("HC")
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()

	-- Para exibir variáveis de controles
	debugMode = true

	-- retangulos para teste
	rects = {HC.rectangle(200, 200, 36, 36), HC.rectangle(400, 400, 36, 36), HC.rectangle(200, 400, 36, 36), HC.rectangle(400, 200, 36, 36)}
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
	if debugMode then
		love.graphics.print("Bullets: "..#Player.bullets.."\nColliding: "..iscoll)
		Player.body:draw()
	end

	-- desenha retangulos para teste
	for i, r in ipairs(rects) do
		r:draw()
	end
end

function love.keypressed(key, scancode, isrepeat)
	if key == "escape" then
		love.event.quit("Apertou esc")
	elseif key == "f2" then
		if debugMode then
			debugMode = false
		else
			debugMode = true
		end
	end
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   = 500
	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
	self.body    = HC.circle(self.x, self.y, self.w / 2)
	self.iscoll  = "NO"
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
	
	-- Move corpo para o Player
	self.body:moveTo(self.x, self.y)

	-- Detecta colisões do Player
	iscoll = "NO"
	for shape, delta in pairs(HC.collisions(self.body)) do
		iscoll = "YES"
		self.x = self.x + delta.x
		self.y = self.y + delta.y
	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