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python-3.x - 无法在pygame中添加多个敌人

问题描述

我正在制作一个类似 Space Invaders 的游戏，当我将敌人的变量存储到列表中以便通过“for i in range(num_of_enemies)”循环将更多敌人添加到游戏中时，我最近收到一个错误说“i”未定义. 我正在使用 Python 3.8 和 PyCharm。我现在说了一切，但我必须继续写才能发布这个。

import pygame
import random
import math

# Initiate pygame
pygame.init()

# Display the game window
screen = pygame.display.set_mode((800, 600))

# Enemies
enemySprite = []
enemyX = []
enemyY = []
enemyX_change = []
enemyY_change = []

num_of_enemies = 6

for i in range(num_of_enemies):
    enemySprite.append(pygame.image.load('enemy.png'))
    enemyX.append(random.randint(0, 736))
    enemyY.append(random.randint(50, 150))
    enemyX_change.append(4)
    enemyY_change.append(20)

def enemy(x, y, i):
    screen.blit(enemySprite[i], (x, y))

def isCollision(enemyX, enemyY, bulletX, bulletY):
    distance = math.sqrt((math.pow(enemyX - bulletX, 2)) + (math.pow(enemyY - bulletY, 2)))
    if distance < 27:
        return True
    else:
        return False

# Game Loop
running = True
while running:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    for i in range(num_of_enemies):

    # Enemies movement
    enemyX[i] += enemyX_change[i]

    # Prevents the enemies from going off the border
    if enemyX[i] <= 0 or enemyX[i] >= 736:
        enemyX_change[i] *= -1
        enemyY[i] += enemyY_change[i]

        # Collision
        collision = isCollision(enemyX[i], enemyY[i], bulletX, bulletY)
        if collision:
            bulletY = 480
            bullet_state = 'ready'
            score += 1
            print(score)
            enemyX[i] = random.randint(0, 736)
            enemyY[i] = random.randint(50, 150)

        enemy(enemyX[i], enemyY[i], i)

    pygame.display.update()

标签： python-3.xpygame

解决方案

这是一个缩进的问题。您必须在for循环中使用敌人逻辑，它迭代敌人，而不是主应用程序循环。
此外bulletX，bulletY没有定义。您必须在主应用程序循环之前定义此变量。
在绘制敌人之前清除显示或绘制背景图像并在单独的循环中绘制敌人。
用于pygame.time.Clock()控制每秒帧数。

bulletX, bulletY = 0, 0

# Game Loop
clock = pygame.time.Clock()
running = True
while running:
    clock.tick(60)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    for i in range(num_of_enemies):

      # Enemies movement
      enemyX[i] += enemyX_change[i]

      # Prevents the enemies from going off the border
      if enemyX[i] <= 0 or enemyX[i] >= 736:
          enemyX_change[i] *= -1
          enemyY[i] += enemyY_change[i]

          # Collision
          collision = isCollision(enemyX[i], enemyY[i], bulletX, bulletY)
          if collision:
              bulletY = 480
              bullet_state = 'ready'
              score += 1
              print(score)
              enemyX[i] = random.randint(0, 736)
              enemyY[i] = random.randint(50, 150)

    # draw background image
    # [...]

    # d raw enemies
    for i in range(num_of_enemies):
        enemy(enemyX[i], enemyY[i], i)

    # update display
    pygame.display.update()

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