Question

我使用Python和Pygame制作了游戏。我的船在四处移动，但我在制作射击子弹时遇到了麻烦。我已经定义了一个名为shootBullets()的函数，但它无效。而现在，如果按空格键，我的船就会移动。当我按左或右箭头键时，它只能移动。当我按空格键时，我希望我的船向屏幕底部射出子弹。这是我的代码：

import pygame,sys
from pygame.locals import *

pygame.init()

black = (0,0,0)
white = (255,255,255)
red = (255,0,0)
green = (0,255,0)
blue = (0,0,255)
bright_blue = (0, 135, 255)
yellow = (255,242,0)
ship_body = (33, 117, 243)

screen = pygame.display.set_mode((500,500))
pygame.display.set_caption("Battleship")
gameExit = False
background = pygame.image.load("Sky Background.png")
bulletImg = pygame.image.load("Bullet.png")
bulletY = 80

def shootBullets():
    for event in pygame.event.get():
        if event.type == KEYDOWN and event.key == K_SPACE:
            bulletY += 5
            screen.blit(bulletImg,(247,bulletY))        

pygame.key.set_repeat(50,50)

ship_points = [ [100, 50], [180, 95], [320, 95], [400, 50], [250, 35] ] 
x = 0
y = 0

while not gameExit:
    for event in pygame.event.get():
        if event.type == QUIT:
            gameExit = True      

        if event.type == KEYDOWN:
            if event.key == pygame.K_LEFT: x = -5
            if event.key == pygame.K_RIGHT: x = 5

            for point in ship_points:
                point[0] += x

            for point in ship_points:
                if point[0] <= 0 or point[0] >= 500:
                    gameExit = True    

    shootBullets()

    screen.fill(black)
    screen.blit(background, (0,0))
    ship = [
            pygame.draw.polygon(screen, ship_body, ship_points),
            pygame.draw.polygon(screen, black, ship_points, 1)]

    pygame.display.update()

pygame.quit()
quit()

Answer 1

在主循环中，您只检查左右，而不是空格。你检查函数shootBullets是否按了空格，但是为时已晚，shootBullets永远不会被执行（实际上如果for event in get()循环以某种方式退出，它会被执行但是这不是你想要的）。

取而代之的是：

while not gameExit:
    for event in pygame.event.get():
        if event.type == QUIT:
            gameExit = True      

        if event.type == KEYDOWN:
            if event.key == pygame.K_LEFT:
                move_left()
            if event.key == pygame.K_RIGHT:
               move_right()
            if event.key == pygame.SPACE:
               shootBullet()
            [...]

为什么我的船不射子弹？

1 个答案: