pygame1sample.py

import sys
import random
import pygame
# FROM https://www.youtube.com/watch?v=o-6pADy5Mdg

pygame.init()

screen_width= 1280
screen_height=900

clock = pygame.time.Clock()
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption('pong')

ball = pygame.Rect(screen_width/2-16, screen_height/2-16, 30,30)
player = pygame.Rect(screen_width-20, screen_height/2, 10, 140)
opponent = pygame.Rect(10, screen_height/2 -70, 10, 140)
font = pygame.font.Font(None, 36)  # None means default font, 36 is the size

bx = 7
by = 7
pspeed = 0
ospeed = 0

bg_color = pygame.Color('grey12')
light_grey = (200,200,200)

pscore=0
oscore=0
text_content = "Hello, Pygame!"

# Get the rectangle bounding the text surface

def print_text(x,y,text_content):
    global screen
    global font
    # Render the text
    text_color = pygame.Color("white")
    text_surface = font.render(text_content, True, text_color)
    text_rect = text_surface.get_rect(center=(x, y))
    # Blit the text surface onto the screen
    screen.blit(text_surface, text_rect)

def proc_event():
    global pspeed
    global ospeed
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_DOWN:
                pspeed += 7
            if event.key == pygame.K_UP:
                pspeed -= 7
            if event.key == pygame.K_DOWN:
                ospeed += 7
            if event.key == pygame.K_UP:
                ospeed -= 7
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_DOWN:
                pspeed -= 7
            if event.key == pygame.K_UP:
                pspeed += 7
            if event.key == pygame.K_DOWN:
                ospeed -= 7
            if event.key == pygame.K_UP:
                ospeed += 7

def update_ball():
    ball.x += bx
    ball.y += by
    player.y += pspeed
    opponent.y += ospeed


def reset_ball_on_collition():
    global bx
    global by
    global ball
    ball.center = (screen_width / 2, screen_height/2)
    bx *= random.choice((-1,1))
    by *= random.choice((-1,1))

def check_ball_animation_physics():
    ## Ball Animation
    global by
    global bx
    if(ball.top <= 0 or ball.bottom >= screen_height):
        by *= -1
    if(ball.left <= 0 or ball.right >= screen_width):
        global pscore
        global oscore
        if ball.left <= 0:
            pscore +=1
        else:
            oscore +=1
        reset_ball_on_collition()
    if(ball.colliderect(player) or ball.colliderect(opponent)):
        bx *= -1

def check_and_update_player_opponent_physics():
    # Player 
    if player.top <= 0:
        player.top =0
    if player.bottom >= screen_height:
        player.bottom = screen_height
    # Opponet 
    if opponent.top <= 0:
        opponent.top =0
    if opponent.bottom >= screen_height:
        opponent.bottom = screen_height
def display_entities():
    pygame.draw.rect(screen, light_grey, player)
    pygame.draw.rect(screen, light_grey, opponent)
    pygame.draw.ellipse(screen, light_grey, ball)
    pygame.draw.aaline(screen, light_grey, (screen_width/2,0), (screen_width/2,screen_height))
    score = str(f"P1: {pscore} VS P2: {oscore}")
    print_text(screen_width/2-100,10, score)


while True:
    proc_event()
    update_ball()
    check_ball_animation_physics()
    check_and_update_player_opponent_physics()
    screen.fill(bg_color)
    display_entities()
    pygame.display.flip()
    clock.tick(60)