pong

--[[===================

Made by: Nemo Eriksson
Pastebin: BTfHqkdW
Description: A simple auto played pong game

====================]]--

-- Recommended monitor size: 4x3

-- All of the pong game
function main()
  -- Gets the monitor
  local monitor = peripheral.find('monitor')
  monitor.setTextScale(4)

  -- Gets the speaker
  local speaker = peripheral.find('speaker')

  -- Returns error if no monitor was found
  if not monitor then
    print('ERROR: No monitor found')
    return false
  end

  -- Returns error if no speaker was found
  if not speaker then
    print('ERROR: No speaker found')
    return false
  end

  -- Game variables
  local boardSymbol = '|'
  local p1x, p1y = 1, 3
  local p2x, p2y = 10, 3
  local screenWidth, screenHeight = monitor.getSize()
  local moveRight = true
  local collisionSound = 'minecraft:entity.experience_orb.pickup'
  local playSound = false

  -- Ball variables
  local defaultBallIcon = 'o'
  local ballIcon = defaultBallIcon
  local xVel, yVel = 1, 1
  local ballX, ballY = 5, 3

  -- Print scores to the computer terminal
  print('===============')
  print('SCORES: ')
  print('Player 1: 0')
  print('Player 2: 0')
  print('===============')

  -- Main loop
  while true do
    monitor.clear()

    -- Draw player 1 board on screen
    monitor.setCursorPos(p1x, p1y)
    monitor.write(boardSymbol)

    -- Draws player 2 board on screen
    monitor.setCursorPos(p2x, p2y)
    monitor.write(boardSymbol)

    -- Draws the ball on screen
    monitor.setCursorPos(ballX, ballY)
    monitor.write(ballIcon)

    -- Plays sound when
    if playSound then
      speaker.playSound(collisionSound)
      playSound = false
    end

    -- Gets next position of the ball
    ballX, ballY = ballX + xVel, ballY + yVel

    -- Inverts ball X velocity if it has collided
    if ballX >= screenWidth-1 or ballX <= 2 then
      xVel = xVel * -1
      playSound = true
    end

    -- Inverts ball Y velocity if it has collided
    if ballY >= screenHeight or ballY <= 1 then
      yVel = yVel * -1
    end

    -- Updates player 1 positions
    if not moveRight then
      p1y = ballY
    end

    -- Updates player 2 positions
    if moveRight then
      p2y = ballY
    end

    moveRight = xVel > 0
    os.sleep(1/3)
  end
end

-- Start screen | loading screen
function startScreen()
  -- Gets monitor
  local monitor = peripheral.find('monitor')
  monitor.setTextScale(2)

  -- Returns error if no monitor is connected to computer
  if not monitor then
    print('ERROR: No monitor found')
    return false
  end

  -- Loading screen variables
  local loadingIterations = 1
  local dotAmount = 5

  -- Loading screen that loades nothing
  for i = 1, loadingIterations, 1 do
    monitor.clear()

    -- Write Pong on monitor so user knows what is loading
    monitor.setCursorPos(8,2)
    monitor.write('Pong!')

    -- Write Loading in middle of monitor
    monitor.setCursorPos(7,6)
    monitor.write('Loading')

    -- Adds the dots
    for i = 1, dotAmount, 1 do
      os.sleep(1/3)
      monitor.write('.')
    end

    os.sleep(0.25)
  end
end

-- Main
shell.run('clear')
print('Made by Nemo Eriksson  -  u/_n3m0__')
startScreen()
main()