Flappy Bird source code

import pygame, sys, random


def draw_floor():
    screen.blit(floor_surface, (floor_x_pos, 400))
    screen.blit(floor_surface, (floor_x_pos + 288, 400))


def create_pipe():
    random_pipe_pos = random.choice(pipe_height)
    bottom_pipe = pipe_surface.get_rect(midtop=(350, random_pipe_pos))
    top_pipe = pipe_surface.get_rect(midbottom=(350, random_pipe_pos - 120))
    return bottom_pipe, top_pipe


def move_pipes(pipes):
    for pipe in pipes:
        pipe.centerx -= 2.5
    return pipes


def draw_pipes(pipes):
    for pipe in pipes:
        if pipe.bottom >= 512:
            screen.blit(pipe_surface, pipe)


def check_collision(pipes):
    for pipe in pipes:
        if bird_rect.colliderect(pipe):
            death_sound.play()
            return False
        else:
            # 2 boolean values for flip function: 1st is if x flip and 2nd is if y flip (boolean)
            flip_pipe = pygame.transform.flip(pipe_surface, False, True)
            screen.blit(flip_pipe, pipe)

    if bird_rect.top <= -50 or bird_rect.bottom >= 400:
        return False
    return True


def rotate_bird(bird):
    new_bird = pygame.transform.rotozoom(bird, -bird_movement * 7, 1)
    return new_bird


def bird_animation():
    new_bird = bird_frames[bird_index]
    new_bird_rect = new_bird.get_rect(center=(50, bird_rect.centery))
    return new_bird, new_bird_rect


def score_display(game_state):
    if game_state == 'main_game':
        score_surface = game_font.render(str(int(score)), True, (0, 0, 255))
        score_rect = score_surface.get_rect(center=(144, 50))
        screen.blit(score_surface, score_rect)

    if game_state == 'game over':
        score_surface = game_font.render(f'Score: {int(score)}', True, (0, 0, 255))
        score_rect = score_surface.get_rect(center=(144, 50))
        screen.blit(score_surface, score_rect)

        high_score_surface = game_font.render(f'High Score: {int(high_score)}', True, (0, 0, 255))
        high_score_rect = high_score_surface.get_rect(center=(144, 350))
        screen.blit(high_score_surface, high_score_rect)


def update_score(score, high_score):
    if score > high_score:
        high_score = score
    return high_score


pygame.mixer.pre_init(frequency=44100, size=16, channels=1, buffer=1024)
pygame.init()
screen = pygame.display.set_mode((288, 512))  # half of this (x,y) is 288,512; double is 576,1024
game_font = pygame.font.Font('freesansbold.ttf', 30)
# Important game variables
# we will add gravity to bird movement every frame
# and this bird movement will move the bird rectangle down
# if bird rectangle goes down, then we put bird_surface on different position


# game variables
gravity = 0.125
bird_movement = 0
game_active = True
score = 0
high_score = 0

bg_surface = pygame.image.load('Images/background-day.png').convert()
# bg_surface = pygame.transform.scale2x(bg_surface)  #(if screen is 576,1024)
floor_surface = pygame.image.load('Images/base.png')
# floor_surface = pygame.transform.scale2x(floor_surface)
FPS = pygame.time.Clock()
floor_x_pos = 0

# animation
bird_downflap = pygame.image.load('Images/yellowbird-downflap.png').convert_alpha()
bird_midflap = pygame.image.load('Images/yellowbird-midflap.png').convert_alpha()
bird_upflap = pygame.image.load('Images/yellowbird-upflap.png').convert_alpha()
bird_frames = [bird_downflap, bird_midflap, bird_upflap]
bird_index = 0
bird_surface = bird_frames[bird_index]
bird_rect = bird_surface.get_rect(center=(50, 256))
# to create a new USEREVENT, add +1,+2 etc
BIRDFLAP = pygame.USEREVENT + 1
pygame.time.set_timer(BIRDFLAP, 200)

#       bird_surface = pygame.image.load('Images/yellowbird-midflap.png').convert_alpha()
# using rect (rectangle) function center = x,y is coordinate of center of rectangle of bird
#       bird_rect = bird_surface.get_rect(center=(50, 256))

pipe_surface = pygame.image.load('Images/pipe-red.png').convert()
pipe_list = []

# how to use timer: 1200 is always in milliseconds. 1 sec = 1000 milliseconds
SPAWNPIPE = pygame.USEREVENT
pygame.time.set_timer(SPAWNPIPE, 1200)
pipe_height = [200, 250, 300, 350]

game_over_surface = pygame.image.load('Images/message.png').convert_alpha()
game_over_rect = game_over_surface.get_rect(center=(144, 256))

# sounds
flap_sound = pygame.mixer.Sound('Sounds/sfx_wing.wav')
death_sound = pygame.mixer.Sound('Sounds/sfx_hit.wav')
score_sound = pygame.mixer.Sound('Sounds/sfx_point.wav')
score_sound_countdown = 100

while True:
    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_SPACE and game_active:
                bird_movement = 0
                bird_movement -= 4.1
                flap_sound.play()

            if event.key == pygame.K_SPACE and game_active == False:
                game_active = True
                pipe_list.clear()
                bird_rect.center = (50, 170)
                bird_movement = 0
                score = 0

        # for spawning pipes
        if event.type == SPAWNPIPE:
            # extend function adds to a tuple
            pipe_list.extend(create_pipe())

        # for bird animation
        if event.type == BIRDFLAP:
            if bird_index < 2:
                bird_index += 1
            else:
                bird_index = 0

            bird_surface, bird_rect = bird_animation()

    screen.blit(bg_surface, (0, 0))

    if game_active:
        # bird
        bird_movement += gravity
        bird_rect.centery += bird_movement

        rotated_bird = rotate_bird(bird_surface)

        screen.blit(rotated_bird, bird_rect)
        game_active = check_collision(pipe_list)

        # pipe movement
        pipe_list = move_pipes(pipe_list)
        draw_pipes(pipe_list)

        # show score
        score += 0.01
        score_display('main_game')
        #score_sound_countdown -= 1
        #if score_sound_countdown <= 0:
         #   score_sound.play()
          #  score_sound_countdown = 100

    else:
        screen.blit(game_over_surface, game_over_rect)
        high_score = update_score(score, high_score)
        score_display('game_over')

    # floor
    floor_x_pos -= 1

    draw_floor()

    if floor_x_pos <= -288:
        floor_x_pos = 0

    pygame.display.update()

    FPS.tick(120)