如何解决提到了pygame代码，并且需要根据需要进行一些修改：
这是我的 space-arcade pygame 的源代码。这是一种非常简单的方法，它也可以发射子弹，但目前这些子弹不会影响屏幕上的障碍物。
问题：如何在发射第一枚子弹后立即发射多枚子弹，否则不等第一枚子弹通过y
import random
pygame.init()
screen = pygame.display.set_mode((800,600))
pygame.display.set_caption("Space Invader")
icon = pygame.image.load("space-invaders.png")
pygame.display.set_icon(icon)
background = pygame.image.load("background.png")
player_image = pygame.image.load("space-invaders.png")
playerX = 370
playerY = 480
playerX_change = 0
playerY_change = 0
def player(x,y):
screen.blit(player_image,(x,y))
obs_image = pygame.image.load("cave-painting (1).png")
obsX = random.randint(0,800)
obsY = random.randint(0,100)
obsX_change = 2
obsY_change = 0.3
def obstacle(x,y):
screen.blit(obs_image,y))
bullet_image = pygame.image.load("bullet.png")
bulletX = 0
bulletY = 0
bulletX_change = 0
bulletY_change = 10
bullet_state = "ready"
def fire_bullet(x,y):
global bullet_state # Globaling it,inorder to access it inside this func.
bullet_state = "fire"
screen.blit(bullet_image,y))
running = True
while running:
screen.fill( (0,0) )
screen.blit(background,(0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
playerX_change = -4
if event.key == pygame.K_RIGHT:
playerX_change = 4
if event.key == pygame.K_UP:
playerY_change = -4
if event.key == pygame.K_DOWN:
playerY_change = 4
if event.key == pygame.K_SPACE:
if bullet_state is "ready":
bulletX = playerX
bulletY = playerY
fire_bullet(bulletX,bulletY)
if event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
playerX_change = 0
if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
playerY_change = 0
playerX += playerX_change
playerY += playerY_change
# Stopping our player beyond screen:
if playerX <= 0:
playerX = 0
elif playerX >= 765:
playerX = 765
elif playerY <= 200:
playerY = 200
elif playerY >= 480:
playerY = 480
obsX += obsX_change
obsY += obsY_change
# Movement mechanics for obstacles:
if obsX <= 0:
obsX_change = 3
obsY += obsY_change
elif obsX >= 736:
obsX_change = -3
obsY += obsY_change
if bulletY <= 0:
bulletY = 480
bullet_state = "ready"
if bullet_state is "fire":
fire_bullet(bulletX,bulletY)
bulletY -= bulletY_change
player(playerX,playerY)
obstacle(obsX,obsY)
pygame.display.update()
解决方法
您必须添加项目符号列表：
bullet_list = []
当产生新的项目符号时，将新位置添加到项目符号列表的头部：
if event.key == pygame.K_SPACE:
bullet_list.insert(0,[playerX,playerY])
移动并循环绘制项目符号。从列表中删除窗口外的项目符号：
while running:
# [...]
for i in range(len(bullet_list)):
bullet_list[i][1] -= bulletY_change
if bullet_list[i][1] < 0:
del bullet_list[i:]
break
# [...]
for bullet in bullet_list:
screen.blit(bullet_image,bullet)
完整示例：
import pygame
import random
pygame.init()
screen = pygame.display.set_mode((800,600))
clock = pygame.time.Clock()
pygame.display.set_caption("Space Invader")
icon = pygame.image.load("space-invaders.png")
pygame.display.set_icon(icon)
background = pygame.image.load("background.png")
player_image = pygame.image.load("space-invaders.png")
playerX = 370
playerY = 480
playerX_change = 0
playerY_change = 0
def player(x,y):
screen.blit(player_image,(x,y))
obs_image = pygame.image.load("cave-painting (1).png")
obsX = random.randint(0,800)
obsY = random.randint(0,100)
obsX_change = 2
obsY_change = 0.3
def obstacle(x,y):
screen.blit(obs_image,y))
bullet_image = pygame.image.load("bullet.png")
bulletX_change = 0
bulletY_change = 10
bullet_list = []
def draw_bullets(bullets):
for bullet in bullets:
screen.blit(bullet_image,bullet)
running = True
while running:
clock.tick(60)
screen.fill( (0,0) )
screen.blit(background,(0,0))
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
playerX_change = -4
if event.key == pygame.K_RIGHT:
playerX_change = 4
if event.key == pygame.K_UP:
playerY_change = -4
if event.key == pygame.K_DOWN:
playerY_change = 4
if event.key == pygame.K_SPACE:
bullet_list.insert(0,playerY])
if event.type == pygame.KEYUP:
if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
playerX_change = 0
if event.key == pygame.K_UP or event.key == pygame.K_DOWN:
playerY_change = 0
playerX += playerX_change
playerY += playerY_change
# Stopping our player beyond screen:
if playerX <= 0:
playerX = 0
elif playerX >= 765:
playerX = 765
elif playerY <= 200:
playerY = 200
elif playerY >= 480:
playerY = 480
obsX += obsX_change
obsY += obsY_change
# Movement mechanics for obstacles:
if obsX <= 0:
obsX_change = 3
obsY += obsY_change
elif obsX >= 736:
obsX_change = -3
obsY += obsY_change
for i in range(len(bullet_list)):
bullet_list[i][1] -= bulletY_change
if bullet_list[i][1] < 0:
del bullet_list[i:]
break
player(playerX,playerY)
obstacle(obsX,obsY)
draw_bullets(bullet_list)
pygame.display.update()
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