在我下面使用 PyGame 的代碼中，角色不會左右移動，子彈也不會射擊。我不確定是什么原因造成的。它可以在沒有帶有按鈕概念的整個開始菜單的情況下工作，所以我想知道這是否是問題所在？import pygamefrom pygame import mixerimport mathimport randomimport time# Initialize pygame modulepygame.init()# Create the screenscreen = pygame.display.set_mode((800, 600))display_width = 800display_height = 600# Backgroundbackground = pygame.image.load('space1.jpg')# Background Soundmixer.music.load('background.wav')mixer.music.play(-1)# Title and Iconpygame.display.set_caption('Space Invaders')icon = pygame.image.load('ufo.png')pygame.display.set_icon(icon)# PlayerplayerImg = pygame.image.load('space-invaders.png')playerX = 370playerY = 480player_change = 0playerX += player_change# EnemyenemyImg = []enemyX = []enemyY = []enemyX_change = []enemyY_change = []num_of_enemies = 6# ColoursWHITE = (255, 255, 255)BLACK = (0, 0, 0)RED = (150, 0, 0)GREEN = (0, 150, 0)BRIGHT_RED = (255, 0,0)BRIGHT_GREEN = (0, 255, 0)for i in range(num_of_enemies): enemyImg.append(pygame.image.load('alien.png')) enemyX.append(random.randint(0, 736)) enemyY.append(random.randint(50, 150)) enemyX_change.append(2) enemyY_change.append(40)# Bullet# Ready - You cant see the bullet on the screen# Fire - The bullet is current movingbulletImg = pygame.image.load('bullet.png')bulletX = 0bulletY = 480bulletY_change = 10bullet_state = 'ready'# Scorescore_value = 0font = pygame.font.Font('freesansbold.ttf', 32)textX = 10textY = 10# Game Over Textover_font = pygame.font.Font('freesansbold.ttf', 64)# Clockclock = pygame.time.Clock()def show_score(x, y): score = font.render('score : ' + str(score_value), True, (0, 255, 0)) screen.blit(score, (x, y))def game_over_text(): over_text = over_font.render('GAME OVER', True, (0, 255, 0)) screen.blit(over_text, (200, 250))def player(x, y): screen.blit(playerImg, (x, y))def enemy(x, y, i): screen.blit(enemyImg[i], (x, y))
2 回答
阿波羅的戰車
TA貢獻1862條經驗 獲得超6個贊
角色不會移動
player_change在主應用程序循環中，播放器的移動連續設置為 0。此外，玩家的位置不斷初始化：
def game_loop(playerX, playerY, player_change, bulletX, bulletY, bulletX_change, >bulletY_change, bullet_state, bulletImg):
running = True
while running:
playerX = 370
playerY = 480
player_change = 0
初始化playerX,playerY和player_change循環之前：
def game_loop(playerX, playerY, player_change, bulletX, bulletY, bulletX_change, bulletY_change, bullet_state, bulletImg):
running = True
player_change = 0
playerX = 370
playerY = 480
while running:
playerX += player_change
# [...]
子彈不會射
如果要發射子彈，則必須設置子彈的初始位置bulletX, bulletY = playerX, playerY并設置bullet_state = 'fire'：
def game_loop(playerX, playerY, player_change, bulletX, bulletY, bulletX_change, bulletY_change, bullet_state, bulletImg):
# [...]
while running:
playerX += player_change
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
# If keystroke is pressed check whether its left or right
if event.type == pygame.KEYDOWN:
# [...]
if event.key == pygame.K_SPACE:
if bullet_state is 'ready':
#bullet_sound = mixer.Sound('laser.wav')
#bullet_sound.play()
# Get the current x coordinate of the spaceship
bulletX, bulletY = playerX, playerY
bullet_state = 'fire'
注意，global變量bullet_state
def fire_bullet(x, y):
global bullet_state
bullet_state = 'fire'
與 中的局部變量不同bullet_state，game_loop因為bullet_state它是一個參數game_loop，因此在不同的范圍內是一個完全不同的變量，其名稱隨便相同：
def game_loop(playerX, playerY, player_change, bulletX, bulletY,
bulletX_change, bulletY_change,
bullet_state, # <--- that is a new variable in local scope
# and not the "global" bullet_state
bulletImg):
# [...]
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