import?pygame
from?pygame.locals?import?*
import?os
import?sys
import?random

#?set?the?game?window?at?the?center?of?the?display
os.environ[‘SDL_VIDEO_CENTERED‘]?=?‘1‘

#?defining?some?global?variables
SCREEN_WIDTH?=?1280
SCREEN_HEIGHT?=?720

FPS?=?30

GROUND_HEIGHT?=?SCREEN_HEIGHT?-?70

PLAY_GAME?=?True

#?initialize?pygame?and?create?window
pygame.init（）
window?=?pygame.display.set_mode（（SCREEN_WIDTH?SCREEN_HEIGHT））
pygame.display.set_caption（“KongLong?Run“）

clock?=?pygame.time.Clock（）

#?load?audio?files
jump_sound?=?pygame.mixer.Sound（“sound/jump.ogg“）
score_sound?=?pygame.mixer.Sound（“sound/score.ogg“）
game_over_sound?=?pygame.mixer.Sound（“sound/game_over.ogg“）


#?function?for?drawing?text?on?the?screen
def?draw_text（text?font_name?size?text_color?position_x?position_y?position）:

????font?=?pygame.font.Font（font_name?size）??#?loads?font

????text_plane?=?font.render（text?True?text_color）??#?renders?given?text?in?the?selected?font
????text_rect?=?text_plane.get_rect（）

????#?setting?text?position
????if?position?==?“midtop“:
????????text_rect.midtop?=?（position_x?position_y）
????elif?position?==?“topright“:
????????text_rect.topright?=?（position_x?position_y）

????window.blit（text_plane?text_rect）??#?draws?the?rendered?text?on?the?screen


#?function?for?loading?single?image?file
def?load_image（path?size_x=0?size_y=0）:

????image?=?pygame.image.load（path）.convert_alpha（）??#?loads?image?file?and?converts?it?into?pixels

????if?size_x?>?0?and?size_y?>?0:
????????image?=?pygame.transform.scale（image?（size_x?size_y））??#?resizing?the?image?to?the?given?size

????return?image?image.get_rect（）


#?function?for?loading?multiple?image?files?in?a?list
def?load_sprites（image_path?image_name_prefix?number_of_image?size_x=0?size_y=0）:

????images?=?[]??#?declaring?list?to?store?the?images

????for?i?in?range（0?number_of_image）:

????????path?=?image_path?+?image_name_prefix?+?str（i）?+?“.png“??#?creating?the?path?string
????????image?=?pygame.image.load（path）.convert_alpha（）??#?loads?image?file?and?converts?it?into?pixels

????????if?size_x?>?0?and?size_y?>?0:
????????????image?=?pygame.transform.scale（image?（size_x?size_y））??#?resizing?the?image?to?the?given?size

????????images.append（image）

????return?images


#?class?for?creating?and?moving?single?background
class?Background:

????def?__init__（self?image_path?speed=10）:

????????self.image0?self.rect0?=?load_image（image_path?1280?720）
????????self.image1?self.rect1?=?load_image（image_path?1280?720）

????????self.rect0.bottom?=?SCREEN_HEIGHT
????????self.rect1.bottom?=?SCREEN_HEIGHT

????????self.rect1.left?=?self.rect0.right

????????self.speed?=?speed

????def?draw（self）:
????????window.blit（self.image0?self.rect0）
????????window.blit（self.image1?self.rect1）

????def?update（self）:

????????self.rect0.left?-=?self.speed
????????self.rect1.left?-=?self.speed

????????if?self.rect0.right?????????????self.rect0.left?=?self.rect1.right

????????if?self.rect1.righ