I've been making a game where a car drives around an open road eating other cars. Pressing spacebar allows the player car to transform and cannibalize other cars until any key event is finished. I had to turn my main game loop into a function to get the intro screen to work and ever since, the cannibalizing still works, but the image transformation stopped working. Does anybody know what's wrong with my code? The functions in question are the 3 at the bottom. Thank you anybody who answers
import pygame
import random
import math
from pygame import mixer
pygame.init()
# Window
screen = pygame.display.set_mode((800, 600))
pygame.display.set_caption("Cannibal Cars")
background = pygame.image.load("backgrpund.png")
clock = pygame.time.Clock()
green = 50, 168, 80
bright_green = 50, 250, 80
black = 0, 0, 0
# background sound
mixer.music.load('background music.wav')
mixer.music.play(-1)
# player animation
playerImg = pygame.image.load("player.png").convert_alpha()
playerX = 200
playerY = 200
playerX_change = 0
playerY_change = 0
player_state = "nice"
# enemy
enemyImg = []
enemyX = []
enemyY = []
enemyX_change = []
num_of_enemies = 30
for i in range(num_of_enemies):
enemyImg.append(pygame.image.load("enemy.png"))
enemyX.append(random.randint(400, 750))
enemyY.append(random.randint(0, 550))
enemyX_change.append(1)
# In game text
score_value = 0
font = pygame.font.Font('freesansbold.ttf', 32)
textX = 10
textY = 10
game_over_font = pygame.font.Font('freesansbold.ttf', 64)
def show_score(x, y):
score = font.render("Score:" str(score_value), True, (255, 255, 255))
screen.blit(score, (x, y))
def text_object(text, font):
textSurface = font.render(text, True, black)
return textSurface, textSurface.get_rect()
def player(x, y):
screen.blit(playerImg, (x, y))
def enemy(x, y):
screen.blit(enemyImg[i], (x, y))
def isCollision(enemyX, enemyY, playerX, playerY):
distance = math.sqrt((math.pow(enemyX - playerX, 2))
(math.pow(enemyY - playerY, 2)))
if distance < 27:
return True
else:
return False
def game_over():
game_over_text = game_over_font.render("GAME OVER: ", True, (255, 255, 255))
screen.blit(game_over_text, (200, 250))
game_intro()
def button(msg,x,y,w,h,ic,ac,action=None):
mouse = pygame.mouse.get_pos()
click = pygame.mouse.get_pressed()
if x w > mouse[0] > x and y h > mouse[1] > y:
pygame.draw.rect(screen, ac, (x, y, w, h))
if click[0] == 1 and action != None:
if action == "play":
game_loop()
else:
pygame.draw.rect(screen, ic, (x, y, w, h))
textSurf, textRect = text_object(msg, font)
textRect.center = ((x (w / 2)), (y h / 2))
screen.blit(textSurf, textRect)
def game_intro():
intro = True
while intro:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
screen.fill("white")
font = pygame.font.Font('freesansbold.ttf', 32)
intro_text = font.render("Cannibal Cars", True, (0, 0, 0))
controls_text = font.render("Arrow keys to move", True, (0, 0, 0))
controls_text2 = font.render("Space bar to transform", True, (0, 0, 0))
controls_text3 = font.render("Stop pressing any key to return to normal", True, (0, 0, 0))
screen.blit(intro_text, (300, 100))
screen.blit(controls_text, (20, 150))
screen.blit(controls_text2, (20, 200))
screen.blit(controls_text3, (20, 250))
button("Play", 300, 450, 100, 50, green, bright_green, "play")
pygame.display.update()
clock.tick(15)
def game_loop():
playerImg = pygame.image.load("player.png").convert_alpha()
playerX = 200
playerY = 200
playerX_change = 0
playerY_change = 0
player_state = "nice"
score_value = 0
playerImg2 = pygame.image.load("cannibal car.png").convert_alpha()
running = True
while running:
screen.fill((0, 0, 0))
screen.blit(background, (0, 0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
# controls
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
playerX_change = -0.8
playerImg = pygame.transform.flip(playerImg, True, False)
if event.key == pygame.K_RIGHT:
playerX_change = 0.8
if event.key == pygame.K_UP:
playerY_change = -0.8
if event.key == pygame.K_DOWN:
playerY_change = 0.8
if playerX_change < 0:
playerImg = pygame.transform.flip(playerImg, True, False)
if event.key == pygame.K_SPACE:
playerImg = playerImg2
player_state = "cannibal"
if event.type == pygame.KEYUP:
playerX_change = 0
playerY_change = 0
playerImg = pygame.image.load("player.png")
player_state = "nice"
# player movement
player(playerX, playerY)
playerX = playerX_change
playerY = playerY_change
if playerX <= 0:
playerX = 0
elif playerX >= 770:
playerX = 770
if playerY <= 0:
playerY = 0
elif playerY >= 570:
playerY = 570
# enemy movement
for i in range(num_of_enemies):
enemyX[i] = enemyX_change[i]
if enemyX[i] <= 0:
enemyX_change[i] = 1
elif enemyX[i] >= 736:
enemyX_change[i] = -1
# Collision with enemy
enemy(enemyX[i], enemyY[i])
collision = isCollision(enemyX[i], enemyY[i], playerX, playerY)
show_score(textX, textY)
if collision:
if player_state == "cannibal":
cannibal_sound = mixer.Sound('Cannibal car.wav')
cannibal_sound.play()
enemyX[i] = (random.randint(0, 800))
enemyY[i] = (random.randint(0, 600))
score_value = 1
else:
game_over()
pygame.display.update()
game_intro()
game_loop()
pygame.display.update()
pygame.quit()
quit()
CodePudding user response：
First, you have to resolve the indentation issue with your game_intro function, otherwise it will only run an infinite loop with black screen.
def game_intro():
intro = True
while intro:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
screen.fill("white")
font = pygame.font.Font('freesansbold.ttf', 32)
intro_text = font.render("Cannibal Cars", True, (0, 0, 0))
controls_text = font.render("Arrow keys to move", True, (0, 0, 0))
controls_text2 = font.render("Space bar to transform", True, (0, 0, 0))
controls_text3 = font.render("Stop pressing any key to return to normal", True, (0, 0, 0))
screen.blit(intro_text, (300, 100))
screen.blit(controls_text, (20, 150))
screen.blit(controls_text2, (20, 200))
screen.blit(controls_text3, (20, 250))
button("Play", 300, 450, 100, 50, green, bright_green, "play")
pygame.display.update()
clock.tick(15)
Second, the playerImg inside your game_loop function is only a local variable to that function. Consequently, the function call player(playerX, playerY) will only change the playerImg as defined in your # player animation portion of the code and not the playerImg variable inside your game_loop. To address that issue, remove/comment the playerImg variable inside your game_loop and replace it with the global playerImg.
def game_loop():
global playerImg
# playerImg = pygame.image.load("player.png").convert_alpha()