init push

bullet.lua

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+Bullet = Object:extend()
+
+function Bullet:new(x, y, p, image)
+	self.image = love.graphics.newImage(image)
+	self.x = x
+	self.y = y
+	self.p = p
+	self.width = self.image:getWidth()
+	self.height = self.image:getHeight()
+end
+
+function Bullet:update(dt)
+	--if bullet belongs to player 1, travel upwards
+	if self.p == 1 then
+		self.y = self.y - (500 * dt)
+	--if bullet belongs to player 2, travel downwards
+	elseif self.p == 2 then
+		self.y = self.y + (500 * dt)
+	end
+
+	--check if the bullet has hit a player
+	if self.p == 1 then
+		if
+			self.x < UserPlayer2.x + UserPlayer2.width
+			and UserPlayer2.x < self.x + self.width
+			and self.y < UserPlayer2.y + UserPlayer2.height
+			and UserPlayer2.y < self.y + self.height
+		then
+			UserPlayer2.health = UserPlayer2.health - 1
+			Bullets1 = {}
+		end
+	end
+
+	--check if the bullet has hit a player
+	if self.p == 2 then
+		if
+			self.x < UserPlayer1.x + UserPlayer1.width
+			and UserPlayer1.x < self.x + self.width
+			and self.y < UserPlayer1.y + UserPlayer1.height
+			and UserPlayer1.y < self.y + self.height
+		then
+			UserPlayer1.health = UserPlayer1.health - 1
+			Bullets2 = {}
+		end
+	end
+
+	--check if the bullet has hit a wall
+	for i, v in ipairs(Walls) do
+		if self.x < v.x + v.w and v.x < self.x + self.width and self.y < v.y + v.h and v.y < self.y + self.height then
+			if self.p == 1 then
+				Bullets1 = {}
+			elseif self.p == 2 then
+				Bullets2 = {}
+			end
+		end
+	end
+end
+
+function Bullet:clear()
+	Bullets1 = {}
+	Bullets2 = {}
+end
+
+function Bullet:draw()
+	for _, v in ipairs(Bullets1) do
+		love.graphics.draw(self.image, self.x, self.y)
+	end
+	for _, v in ipairs(Bullets2) do
+		love.graphics.draw(self.image, self.x, self.y)
+	end
+end

classic.lua

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+--
+-- classic
+--
+-- Copyright (c) 2014, rxi
+--
+-- This module is free software; you can redistribute it and/or modify it under
+-- the terms of the MIT license. See LICENSE for details.
+--
+
+
+local Object = {}
+Object.__index = Object
+
+
+function Object:new()
+end
+
+
+function Object:extend()
+  local cls = {}
+  for k, v in pairs(self) do
+    if k:find("__") == 1 then
+      cls[k] = v
+    end
+  end
+  cls.__index = cls
+  cls.super = self
+  setmetatable(cls, self)
+  return cls
+end
+
+
+function Object:implement(...)
+  for _, cls in pairs({...}) do
+    for k, v in pairs(cls) do
+      if self[k] == nil and type(v) == "function" then
+        self[k] = v
+      end
+    end
+  end
+end
+
+
+function Object:is(T)
+  local mt = getmetatable(self)
+  while mt do
+    if mt == T then
+      return true
+    end
+    mt = getmetatable(mt)
+  end
+  return false
+end
+
+
+function Object:__tostring()
+  return "Object"
+end
+
+
+function Object:__call(...)
+  local obj = setmetatable({}, self)
+  obj:new(...)
+  return obj
+end
+
+
+return Object

conf.lua

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+function love.conf(t)
+	t.window.width = 1280
+	t.window.height = 720
+	t.window.title = "Space Invaders"
+	t.window.icon = "green.png"
+end

drawGame.lua

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+function DrawGameOver()
+	local s = ""
+	if HasP1Won then
+		s = "Player 1 Wins"
+	elseif HasP2Won then
+		s = "Player 2 Wins"
+	end
+	local sw, sh = GameFont:getWidth(s), GameFont:getHeight(s)
+	local centreX = love.graphics.getWidth() / 2
+	local centreY = love.graphics.getHeight() / 2
+	love.graphics.print(s, centreX - sw / 2, centreY - sh / 2)
+end
+
+function DisplayHealth()
+	local height = love.graphics.getHeight()
+	local width = love.graphics.getWidth()
+	love.graphics.print("" .. UserPlayer1.health, width - 120, height - 120)
+	love.graphics.print("" .. UserPlayer2.health, 0, 0)
+end
+
+function drawGame()
+	-- Debug Info
+	love.graphics.setColor(1, 1, 1) -- RGB values for white are (1, 1, 1)
+	love.graphics.setFont(DebugFont)
+	love.graphics.print("FPS: " .. love.timer.getFPS(), 1200, 10)
+	--
+
+	love.graphics.setFont(GameFont)
+	--love.graphics.print("" .. TimeToPlaceWall, 300, 500)
+	DisplayHealth()
+	DrawGameOver()
+
+	-- Bullets Draw
+	for _, v in ipairs(Bullets1) do
+		v:draw()
+	end
+	for _, v in ipairs(Bullets2) do
+		v:draw()
+	end
+
+	-- Players Draw
+	UserPlayer1:draw()
+	UserPlayer2:draw()
+
+	-- Walls Draw
+	for _, v in ipairs(Walls) do
+		v:draw()
+	end
+end

enemy.lua

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+Enemy = Object:extend()
+
+function Enemy:new(x, y, image, speed)
+	self.image = love.graphics.newImage(image)
+	self.x = x
+	self.y = y
+	self.speed = speed
+	self.width = self.image:getWidth()
+	self.height = self.image:getHeight()
+end
+
+function Enemy:update(dt)
+	--check if enemy has touched the wall and bouce back
+	if self.x < 0 then
+		self.x = 0
+		self.speed = -self.speed
+	elseif self.x + self.width > love.graphics.getWidth() then
+		self.x = love.graphics.getWidth() - self.width
+		self.speed = -self.speed
+	end
+end
+
+function Enemy:draw()
+	love.graphics.draw(self.image, self.x, self.y)
+end

keyPressed.lua

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+function keyPressed(key)
+	if key == "space" then
+		local bullet = Bullet(UserPlayer1.x + UserPlayer1.width / 2, UserPlayer1.y, 1, "bullet.png", 500)
+		table.insert(Bullets1, bullet)
+	elseif key == "return" then
+		local bullet = Bullet(UserPlayer2.x + UserPlayer2.width / 2, UserPlayer2.y, 2, "bullet.png", 500)
+		table.insert(Bullets2, bullet)
+	elseif key == "escape" then
+		love.event.quit()
+	elseif key == "r" then
+		love.load()
+	end
+end

main.lua

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+function love.load()
+	-- Objects, classes
+	Object = require("classic")
+	require("player")
+	require("bullet")
+	require("walls")
+
+	-- Lua files for the game
+	require("updateGame")
+	require("drawGame")
+	require("keyPressed")
+
+	love.math.setRandomSeed(os.time())
+
+	GameFont = love.graphics.newFont("Daydream.ttf", 60)
+	DebugFont = love.graphics.newFont("Daydream.ttf", 12)
+	love.graphics.setFont(GameFont)
+
+	ScrnHeight = love.graphics.getHeight()
+	ScrnWidth = love.graphics.getWidth()
+
+	UserPlayer1 = Player(400, ScrnHeight - 30, 1, 3, "player1.png", 300)
+	UserPlayer2 = Player(200, 0, 2, 3, "player2.png", 300)
+
+	Bullets1 = {}
+	Bullets2 = {}
+
+	Walls = {}
+
+	TIMER = 10
+
+	TimeToPlaceWall = TIMER
+	HasP1Won = false
+	HasP2Won = false
+end
+
+function love.keypressed(key)
+	keyPressed(key)
+end
+
+function love.update(dt)
+	updateGame(dt)
+end
+
+function love.draw()
+	drawGame()
+end

player.lua

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+Player = Object:extend()
+
+function Player:new(x, y, p, health, image, speed)
+	self.image = love.graphics.newImage(image)
+	self.x = x
+	self.y = y
+	self.p = p
+	self.health = health
+	self.speed = speed
+	self.width = self.image:getWidth()
+	self.height = self.image:getHeight()
+end
+
+function Player:update(dt)
+	if self.p == 1 then
+		if love.keyboard.isDown("d") then
+			self.x = self.x + (self.speed * dt)
+		elseif love.keyboard.isDown("a") then
+			self.x = self.x - (self.speed * dt)
+		end
+	elseif self.p == 2 then
+		if love.keyboard.isDown("right") then
+			self.x = self.x + (self.speed * dt)
+		elseif love.keyboard.isDown("left") then
+			self.x = self.x - (self.speed * dt)
+		end
+	end
+
+	--check if player is out of bounds
+	if self.x < 0 then
+		self.x = 0
+	elseif self.x + self.width > love.graphics.getWidth() then
+		self.x = love.graphics.getWidth() - self.width
+	end
+end
+
+function Player:draw()
+	love.graphics.draw(self.image, self.x, self.y)
+end

updateGame.lua

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+function CheckHealth(p1, p2)
+	if p1.health == 0 then
+		HasP2Won = true
+	elseif p2.health == 0 then
+		HasP1Won = true
+	end
+end
+
+function updateGame(dt)
+	TimeToPlaceWall = TimeToPlaceWall - dt
+	if TimeToPlaceWall <= 0 then
+		--place a wall at a random location
+		local ranx = love.math.random(100, 1000)
+		local rany = love.math.random(100, 600)
+		local ranw = love.math.random(100, 500)
+		local ranh = love.math.random(20, 80)
+		local lifetime = love.math.random(4, 10)
+		local wall = Wall(ranx, rany, ranw, ranh, lifetime)
+		table.insert(Walls, wall)
+		TimeToPlaceWall = TIMER --reset the timer
+	end
+
+	-- Walls Updates
+	for i, v in ipairs(Walls) do
+		v:update(dt)
+	end
+
+	-- Check the players health
+	CheckHealth(UserPlayer1, UserPlayer2)
+
+	-- Bullets Updates
+	for i, v in ipairs(Bullets1) do
+		v:update(dt)
+		if v.y < 0 then --top of screen
+			table.remove(Bullets1, i)
+		elseif v.y > love.graphics.getHeight() then --bottom of screen
+			table.remove(Bullets1, i)
+		end
+	end
+
+	for i, v in ipairs(Bullets2) do
+		v:update(dt)
+		if v.y < 0 then --top of screen
+			table.remove(Bullets2, i)
+		elseif v.y > love.graphics.getHeight() then --bottom of screen
+			table.remove(Bullets2, i)
+		end
+	end
+
+	-- Player Updates
+	UserPlayer1:update(dt)
+	UserPlayer2:update(dt)
+end

walls.lua

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+Wall = Object:extend()
+
+function Wall:new(x, y, w, h, lifetime)
+	self.x = x
+	self.y = y
+	self.w = w --width of wall
+	self.h = h --height of wall
+	self.lifetime = lifetime
+end
+
+function lerp(a, b, t)
+	return a + (b - a) * t
+end
+
+function Wall:update(dt)
+	--slowly decrease the lifetime of the wall
+	self.lifetime = self.lifetime - dt
+	--delete wall after lifetime is up
+	if self.lifetime <= 0 then
+		for i, v in ipairs(Walls) do
+			if v == self then --if the wall is the same as the wall we want to delete
+				table.remove(Walls, i)
+			end
+		end
+	end
+end
+
+function Wall:draw()
+	local rectangleColor = { 1, 0, 0 } -- Starting color (red)
+	love.graphics.setColor(rectangleColor) --white
+	love.graphics.rectangle("fill", self.x, self.y, self.w, self.h)
+end