FIRST PROJECT IN PONG

ai.lua

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+
+
+AI = {}
+
+
+function AI:load()
+  self.width = 20
+  self.height = 100
+  self.x = love.graphics.getWidth() - self.width - 50
+  self.y = love.graphics.getHeight() / 2
+  self.yVel = 0
+  self.speed = 500
+
+  self.timer = 0
+  self.rate = 0.5
+end
+
+
+function AI:update(dt)
+  self:move(dt)
+  self.timer = self.timer + dt
+  if self.timer > self.rate then
+     self.timer = 0
+     self:acquireTarget()
+  end
+end
+
+
+function AI:move(dt)
+  self.y = self.y + self.yVel * dt
+end
+
+
+function AI:acquireTarget()
+  if Ball.y + Ball.height < self.y then
+     self.yVel = -self.speed
+  elseif Ball.y > self.y + self.height then
+     self.yVel = self.speed
+  else
+     self.yVel = 0
+  end
+end
+
+    
+function AI:draw()
+  love.graphics.rectangle("fill", self.x, self.y, self.width, self.height)
+end

ball.lua

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+
+
+Ball = {}
+
+
+function Ball:load()
+  self.x = love.graphics.getWidth() / 2
+  self.y = love.graphics.getHeight() / 2
+  self.width = 20
+  self.height = 20
+  self.speed = 200
+  self.xVel = -self.speed
+  self.yVel = 0
+end
+
+
+function Ball:update(dt)
+  self:move(dt)
+  self:collide()
+end
+
+
+function Ball:collide()
+  if checkCollision(self, Player) then
+     self.xVel = self.speed
+     local middleBall = self.y + self.height / 2
+     local middlePlayer = Player.y + Player.height / 2
+     local collisionPosition = middleBall - middlePlayer
+     self.yVel = collisionPosition * 5
+  end
+
+
+  if checkCollision(self, AI) then
+     self.xVel = -self.speed
+     local middleBall = self.y + self.height / 2
+     local middleAI = AI.y + AI.height / 2
+     local collisionPosition = middleBall - middleAI
+     self.yVel = collisionPosition * 5
+  end
+
+
+
+  if self.y < 0 then 
+     self.y = 0
+     self.yVel = -self.yVel
+  elseif self.y + self.height > love.graphics.getHeight() then
+     self.y = love.graphics.getHeight() - self.height
+     self.yVel = -self.yVel
+  end
+  
+  if self.x < 0 then
+     self.x = love.graphics.getWidth() / 2 - self.width / 2
+     self.y = love.graphics.getHeight() / 2 - self.height / 2
+     self.yVel = 0
+     self.xVel = self.speed
+  end
+
+  if self.x + self.width > love.graphics.getWidth() then
+     self.x = love.graphics.getWidth() / 2 - self.width / 2
+     self.y = love.graphics.getHeight() / 2 - self.height / 2
+     self.yVel = 0
+     self.xVel = -self.speed
+  end
+end
+
+
+function Ball:move(dt)
+  self.x = self.x + self.xVel * dt
+  self.y = self.y + self.yVel * dt
+end
+
+function Ball:draw()
+  love.graphics.rectangle("fill", self.x, self.y, self.width, self.height) 
+end

conf.lua

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+
+function love.conf(t)
+    t.title = "Pong"                  -- The title of the window the game is in (string)
+    t.version = "11.3"                    -- The LÖVE version this game was made for (string)
+    t.console = true                     -- Attach a console (boolean, Windows only)
+    t.window.width = 1280                 -- The window width (number)
+    t.window.height = 720                 -- The window height (number)
+end

main.lua

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+require("player")
+require("ball")
+require("ai")
+
+function love.load()
+  Player:load()
+  Ball:load()
+  AI:load()
+end
+
+
+function love.update(dt)
+  Player:update(dt)
+  Ball:update(dt)
+  AI:update(dt)
+end
+
+
+function love.draw()
+  Player:draw()
+  Ball:draw()
+  AI:draw()
+end
+
+
+function checkCollision(a, b)
+  if a.x + a.width > b.x and a.x < b.x + b.width and a.y + a.height > b.y and a.y < b.y + b.height then
+    return true
+  else
+    return false
+  end
+end

player.lua

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+
+
+Player = {}
+
+function Player:load()
+  self.x = 50
+  self.y = love.graphics.getHeight() / 2
+  self.width = 20
+  self.height = 100
+  self.speed = 500
+end
+
+
+function Player:update(dt)
+  self:move(dt)
+  self:checkBoundaries()
+end
+
+function Player:move(dt)
+  if love.keyboard.isDown("w") then
+    self.y = self.y - self.speed * dt
+  elseif love.keyboard.isDown("s") then
+    self.y = self.y + self.speed * dt
+  end
+end
+
+
+function Player:checkBoundaries()
+  if self.y < 0 then
+     self.y = 0
+  elseif self.y + self.height > love.graphics.getHeight() then
+     self.y = love.graphics.getHeight() - self.height
+  end
+end
+
+
+function Player:draw()
+  love.graphics.rectangle("fill", self.x, self.y, self.width, self.height)
+end