Pong AI

During the lockdown i made a pong-AI. It works by calculating the course of the ball with this code:

def calculate_move(self, middelpunt):
  x = (bal.pos[2] + bal.pos[0]) / 2
  y = (bal.pos[3] + bal.pos[1]) / 2
  move_x = bal.x
  move_y = bal.y
  while True:
    x += move_x
    y += move_y
    if y <= 0:
      move_y = 2
    if y >= self.canvas_height:
      move_y = -2
    if x >= self.computer_pos[0]:
      return y

First, this code stores the position of the ball and the speed and direction in which the ball is moving:

x = (bal.pos[2] + bal.pos[0]) / 2
y = (bal.pos[3] + bal.pos[1]) / 2
move_x = bal.x
move_y = bal.y

Then the code starts a while loop and increases the position of the ball with the speed at which the ball is moving:

while True:
  x += move_x
  y += move_y

When the ball is out of the playing area, it will change the y direction so that the ball comes back into the playing area:

if y <= 0:
  move_y = 2
if y >= self.canvas_height:
  move_y = -2

When the ball's x position is eventually past the paddle, the program returns the ball's y position, telling the paddle where to go:

if x >= self.computer_pos[0]:
  return y

When the ball goes the other way, the calculate_center() function makes the ball go back to the center and go up and down there:

def calculate_center(self, middelpunt):
  center = self.canvas_height / 2
  if middelpunt > center or self.move == 'up':
    self.time += 1
    self.move = 'up'
    if self.time == 26:
      self.move = ''
      self.time = 0
    return -2
  elif middelpunt < center or self.move == 'down':
    self.time += 1
    self.move = 'down'
    if self.time == 26:
      self.move = ''
      self.time = 0
    return 2

For the paddle to behave a bit humanly, there is a variable self.time in the code to go up for a longer time and also for a longer time down.