Question

所以我只是用pygame和python编写了一个用于练习的道奇游戏。我已经阅读了很多教程并看了其他类似的游戏来帮助我。基本上，外星人从屏幕的顶部下来（它们应该是随机的大小和速度，它们的位置也应该是随机的）并且玩家使用他们的鼠标移动宇宙飞船来躲避坠落的外星人。

我有一个if语句应该会使从顶部下来的外星人成倍增加但是当我运行游戏时只有一个外星人掉下来，当它到达屏幕的末尾时它就会消失。没有其他外星人出现。该程序仍在运行，因此游戏尚未结束。

这是我的完整代码。

import pygame
import random
import sys
from pygame.locals import *
alienimg = pygame.image.load('C:\\Python27\\alien.png')
playerimg = pygame.image.load('C:\\Python27\\spaceship.png')

def playerCollision(playerRect, aliens): # a function for when the player hits an alien
    for a in aliens:
        if playerRect.colliderect(a['rect']):
            return True
    return False

def screenText(text, font, screen, x, y): #text display function
    textobj = font.render(text, 1, (255, 255, 255))
    textrect = textobj.get_rect()
    textrect.topleft = (x,y)
    screen.blit(textobj, textrect)

def main(): #this is the main function that starts the game

    pygame.init()

    screen = pygame.display.set_mode((500,500))
    clock = pygame.time.Clock()
    pygame.mouse.set_visible(False)
    pygame.display.set_caption('Dodge the Aliens') 
    font = pygame.font.SysFont("monospace", 45)


    pressed = pygame.key.get_pressed()

    aliens = []
    score = 0
    alienAdd = 0
    addedaliens = 0
    gameOver = False
    moveLeft = moveRight = moveUp = moveDown = False
    topScore = 0
    while gameOver==False: #while loop that actually runs the game
        score += 1

        playerImage =   pygame.image.load('C:\\Python27\\spaceship.png').convert() # the player images
        playerRect = playerImage.get_rect()
        screen.blit(playerImage, [300, 250])
        alienImage = pygame.image.load('C:\\Python27\\alien.png').convert() #alien images
        alienRect = alienImage.get_rect()
        screen.blit(alienImage, [ 50, 50 ])
        pygame.display.flip()


        for event in pygame.event.get(): #key controls
            if event.type == KEYDOWN and event.key == pygame.K_ESCAPE: #escape ends the game
                gameOver = True
            elif event.type == MOUSEMOTION:
                playerRect.move_ip(event.pos[0] - playerRect.centerx, event.pos[1] - playerRect.centery)
        screen.fill((0,0,0))
        pygame.display.flip()


        if not gameOver:
            alienAdd += 1
        if alienAdd == 6: # randomly adding aliens of different sizes and speeds
            aliendAdd = 0
            alienSize = random.randint(8, 25)
            newAlien = {'rect': pygame.Rect(random.randint(0, 500 - alienSize), 0 -alienSize, alienSize, alienSize),
                    'speed': random.randint(1, 8),
                    'surface':pygame.transform.scale(alienImage, (alienSize, alienSize)),
                    }
            aliens.append(newAlien)

        if moveLeft and playerRect.left > 0:
            playerRect.move_ip(-1 * 5, 0)
        if moveRight and playerRect.right < 500:
            playerRect.move_ip(5, 0)
        if moveUp and playerRect.top > 0:
            playerRect.move_ip(0, -1 * 5)
        if moveDown and playerRect.bottom < 500:
            playerRect.move_ip(0, 5)

        for a in aliens:
            if not gameOver:
                a['rect'].move_ip(0, a['speed'])


        for a in aliens[:]:
            if a['rect'].top > 500:
                aliens.remove(a) #removes the aliens when they get to the bottom of the screen

        screenText('Score %s' % (score), font, screen, 10, 0)
        screen.blit(playerImage, playerRect)

        pygame.display.update()

        for a in aliens:
            screen.blit(a['surface'], a['rect'])
        pygame.display.flip()


        if playerCollision(playerRect, aliens):
            if score > topScore:
                topScore = score
            gameOver = True


        clock.tick(30)

    screenText('Game Over!', font, screen, (750 / 6), ( 750 / 6))
    screenText('Press ENTER To Play Again.', font, screen, ( 750 / 6) - 80, (750 / 6) + 50)
    pygame.display.update()

if __name__ == "__main__":
    main()

另外，旁注，每当我把代码放在这里时，我都会向下走，然后缩进它。有没有更简单的方法呢？

Answer 1

aliendAdd = 0中有拼写错误，应为alienAdd = 0。这会导致您越来越多地递增alienAdd而不会再次点击alienAdd == 6的if语句。

无法弄清楚如何在我的pygame中成倍增加外星人？

1 个答案: