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我的代码有问题，我分配了空间来创建子弹然后发射它并将其更新到屏幕上。有什么问题？

import pygame, random, os, sys

pygame.init()
pygame.mixer.pre_init(441100, -16, 2, 2048)
pygame.mixer.init()

width = 640
height = 480

black = (  0,  0,  0)
white = (255,255,255)

playerimg = pygame.image.load("images/shipup.png")

class player: # Class for player ship
    def __init__(self, x, y, xc, yc, w, h, angle, img, lives, direc):
        self.x = x
        self.y = y
        self.xc = xc
        self.yc = yc
        self.w = w
        self.h = h
        self.img = img
        self.lives = lives
        self.angle = angle
        self.direc = direc

    def update(self):
        gameDisplay.blit(self.img, (self.x, self.y))
        self.x += self.xc
        self.y += self.yc

playership = player(10, 10, 0, 0, 30, 50, 0, playerimg, 3, "up")

bulletxc = 0
bulletyc = 0

class bullet: # Class for shooting bullets
    def __init__(self, x, y, xc, yc, w, h, img):
        self.x = x
        self.y = y
        self.xc = xc
        self.yc = yc
        self.w = w
        self.h = h
        self.img = img

    def update(self):
        gameDisplay.blit(self.img, (self.x, self.y))
        self.x += self.xc
        self.y += self.yc
        if playership.direc == "right": # Determines what direction to shoot
            bulletxc = 6
            bulletyc = 0
        if playership.direc == "left":
            bulletxc = -6
            bulletyc = 0
        if playership.direc == "up":
            bulletyc = -6
            bulletxc = 0
        if playership.direc == "down":
            bulletyc = 6
            bulletxc = 0

bulletlist = ()

gameDisplay = pygame.display.set_mode((width, height))
pygame.display.set_caption("Asteroids", "Ast...")
clock = pygame.time.Clock()

def mainloop():
    global bulletlist
    gameExit = False

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

                                                # Basic movements V
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_w:
                    playership.yc = -3
                    playership.img = pygame.image.load("images/shipup.png")

                if event.key == pygame.K_s:
                    playership.yc = 3
                    playership.img = pygame.image.load("images/shipdown.png")

                if event.key == pygame.K_d:
                    playership.xc = 3
                    playership.img = pygame.image.load("images/shipright.png")

                if event.key == pygame.K_a:
                    playership.xc = -3
                    playership.img = pygame.image.load("images/shipleft.png")

                if event.key == pygame.K_SPACE: # Here is where the bullet fires.
                    for i in bulletlist:
                        bulletlist.append(bullet)
                        bulletlist = bullet(playership.x + 25, playership.y + 25, bulletxc, bulletyc, 5, 10, pygame.image.load("images/bullet.png"))

            elif event.type == pygame.KEYUP:
                if event.key == pygame.K_w:
                    playership.yc = 0

                if event.key == pygame.K_s:
                    playership.yc = 0

                if event.key == pygame.K_d:
                    playership.xc = 0

                if event.key == pygame.K_a:
                    playership.xc = 0

        gameDisplay.fill(black)

        playership.update()
        for i in bulletlist:
            i.update()

        if playership.x < 0: # Collisions against the sides of the screen.
            playership.x = -1

        if playership.y < 0:
            playership.y = -1

        if playership.x + playership.h > width:
            playership.x = width - playership.h

        if playership.y + playership.h > height:
            playership.y = height - playership.h

        pygame.display.update()
        clock.tick(60)


if __name__ == "__main__":
    mainloop()


pygame.quit()
quit()

问题：项目符号没有出现，但没有错误。

尝试：使用 K_SPACE if 语句中的 gameDisplay.blit 手动更新它。

4

3 回答 3

2

问题出在这段代码中：

if event.key == pygame.K_SPACE: # Here is where the bullet fires.
    for i in bulletlist:
        bulletlist.append(bullet)
        bulletlist = bullet(playership.x + 25, playership.y + 25, 
            bulletxc, bulletyc, 5, 10, pygame.image.load("images/bullet.png"))

问题是您之前定义的bulletlist：

bulletlist = ()

作为一个空元组。但是，在上面的代码中，您的for循环不会做任何事情，因为 的长度bulletlist是0，所以永远不会有 的值i。这段代码在 Python 中不会出错，但它也不会做任何事情。

但是，即使它有一个长度，您也会将标识符重新分配给loop内的bulletlist一个实例，这是一个坏主意。我建议您考虑一下您要在这里完成的工作，并可能想出另一种方法。bullet for

于 2015-01-12T03:27:40.000 回答
0 
import pygame, random, os, sys

pygame.init()
pygame.mixer.pre_init(441100, -16, 2, 2048)
pygame.mixer.init()

width = 640
height = 480

black = (  0,  0,  0)
white = (255,255,255)

playerimg = pygame.image.load("images/shipup.png")

class player: # Class for player ship
    def __init__(self, x, y, xc, yc, w, h, angle, img, lives, direc):
        self.x = x
        self.y = y
        self.xc = xc
        self.yc = yc
        self.w = w
        self.h = h
        self.img = img
        self.lives = lives
        self.angle = angle
        self.direc = direc

    def update(self):
        gameDisplay.blit(self.img, (self.x, self.y))
        self.x += self.xc
        self.y += self.yc

playership = player(10, 10, 0, 0, 30, 50, 0, playerimg, 3, "up")

bulletxc = 0
bulletyc = 0

class bullet: # Class for shooting bullets
    def __init__(self, x, y, xc, yc, w, h, img):
        self.x = x
        self.y = y
        self.xc = xc
        self.yc = yc
        self.w = w
        self.h = h
        self.img = img

    def update(self):
        gameDisplay.blit(self.img, (self.x, self.y))
        self.x += self.xc
        self.y += self.yc
        if playership.direc == "right": # Determines what direction to shoot
            bulletxc = 6
            bulletyc = 0
        if playership.direc == "left":
            bulletxc = -6
            bulletyc = 0
        if playership.direc == "up":
            bulletyc = -6
            bulletxc = 0
        if playership.direc == "down":
            bulletyc = 6
            bulletxc = 0

bulletlist = bullet(-33, -33, bulletxc, bulletyc, 5, 5, pygame.image.load("images/bullet.png"))

gameDisplay = pygame.display.set_mode((width, height))
pygame.display.set_caption("Asteroids", "Ast...")
clock = pygame.time.Clock()

def mainloop():
    global bulletlist
    gameExit = False

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

                                                # Basic movements V
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_w:
                    playership.yc = -3
                    playership.img = pygame.image.load("images/shipup.png")
                    bulletyc = -6
                    bulletxc = 0

                if event.key == pygame.K_s:
                    playership.yc = 3
                    playership.img = pygame.image.load("images/shipdown.png")
                    bulletyc = 6
                    bulletxc = 0

                if event.key == pygame.K_d:
                    playership.xc = 3
                    playership.img = pygame.image.load("images/shipright.png")
                    bulletxc = 6
                    bulletyc = 0

                if event.key == pygame.K_a:
                    playership.xc = -3
                    playership.img = pygame.image.load("images/shipleft.png")
                    bulletxc = -6
                    bulletyc = 0

                if event.key == pygame.K_SPACE: # Here is where the bullet fires.
                    bulletlist = bullet(playership.x + 15, playership.y + 15, bulletxc, bulletyc, 5, 5, pygame.image.load("images/bullet.png"))

            elif event.type == pygame.KEYUP:
                if event.key == pygame.K_w:
                    playership.yc = 0

                if event.key == pygame.K_s:
                    playership.yc = 0

                if event.key == pygame.K_d:
                    playership.xc = 0

                if event.key == pygame.K_a:
                    playership.xc = 0

        gameDisplay.fill(black)

        playership.update()
        bulletlist.update()

        if playership.x < 0: # Collisions against the sides of the screen.
            playership.x = -1

        if playership.y < 0:
            playership.y = -1

        if playership.x + playership.h > width:
            playership.x = width - playership.h

        if playership.y + playership.h > height:
            playership.y = height - playership.h

        pygame.display.update()
        clock.tick(60)


if __name__ == "__main__":
    mainloop()


pygame.quit()
quit()

摆脱了元组，它工作正常。

于 2015-01-12T03:38:14.990 回答
-1 
if event.key == pygame.K_SPACE: # Here is where the bullet fires.
                    for i in bulletlist:
                        bulletlist.append(bullet)
                        bulletlist = bullet(playership.x + 25, playership.y + 25, bulletxc, bulletyc, 5, 10, pygame.image.load("images/bullet.png"))

在这里;

bulletlist = bullet(playership.x + 25, playership.y + 25, bulletxc, bulletyc, 5, 10, pygame.image.load("images/bullet.png"))

这部分是错误的，你bulletlist不再是元组了。看到这一点，您的bullet班级不再存储它，您应该修复该语句。

另外，我认为您不能用这种方法生火，请查看有关 Pygame 的更多信息。这是非常棒的教程。

于 2015-01-12T03:31:25.933 回答