按下射击按钮时控制射击频率？

Question

当按钮被按下时，子弹会一次性全部射出，但我希望只有当射击按钮被按下时，每0.5秒才射出一次子弹。

我尝试过导入time并延迟子弹，但这只是延迟了pygame本身。

有没有办法控制角色射击的频率？

import pygame

pygame.init()

win = pygame.display.set_mode((700, 480))
pygame.display.set_caption("First project")
run = True
red = (255, 0, 0)
green = (0, 255, 0)


def drawbg():
    pygame.display.update()
    win.fill((255, 255, 255))
    for bullet in bullets:
        bullet.draw(win)


class person(object):
    def __init__(self, x, y, width, height):
        self.x = x
        self.y = y
        self.width = width
        self.height = height
        self.vel = 5
        self.IsJump = False
        self.jumpCount = 10
        self.left = False
        self.right = False

class projectile(object):
    def __init__(self, x, y, radius, colour, facing):
        self.x = x
        self.y = y
        self.radius = radius
        self.colour = colour
        self.facing = facing
        self.vel = 7 * facing

    def draw(self, win):
        pygame.draw.circle(win, self.colour, (self.x, self.y), self.radius)

man = person(100, 400, 50, 60)
man2 = person(500, 400, 50, 60)
bullets = []

while run:
    pygame.time.delay(25)

    for bullet in bullets:
        if bullet.x < 700 and bullet.x > 0:
            bullet.x += bullet.vel
        else:
            bullets.pop(bullets.index(bullet))


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

    keys = pygame.key.get_pressed()

    if keys[pygame.K_g]:
        if man.left:
            facing = -1
        else:
            facing = 1
        if len(bullets) < 5:
            bullets.append(projectile(man.x + man.width//2, round(man.y + man.height/2), 6, (100, 100, 100), facing))


    if keys[pygame.K_p]:
        if man2.left:
            facing = -1
        else:
            facing = 1
        if len(bullets) < 50:
            bullets.append(projectile(man2.x + man2.width//2, round(man2.y + man2.height/2), 6, (0, 0, 0), facing))

    if keys[pygame.K_LEFT] and man2.x > man2.vel:
        man2.x -= man2.vel
        man2.left = True
        man2.right = False

    if keys[pygame.K_RIGHT] and man2.x < 700 - man2.width - man2.vel:
        man2.x += man2.vel
        man2.right = True
        man2.left = False

    if keys[pygame.K_a] and man.x > man.vel:
        man.x -= man.vel
        man.left = True
        man.right = False

    if keys[pygame.K_d] and man.x < 700 - man.width - man.vel:
        man.x += man.vel
        man.right = True
        man.left = False


    if not man.IsJump and keys[pygame.K_w]:
        man.IsJump = True
        man.JumpCount = 10

    if man.IsJump:
        if man.JumpCount >= -10:
            neg = 1
            if man.JumpCount < 0:
                neg = -1
            man.y -= (man.JumpCount ** 2) / 2 * neg
            man.JumpCount -= 1
        else:
            man.IsJump = False
            man.JumpCount = 10

    if not man2.IsJump and keys[pygame.K_UP]:
        man2.IsJump = True
        man2.JumpCount = 10

    if man2.IsJump:
        if man2.JumpCount >= -10:
            neg = 1
            if man2.JumpCount < 0:
                neg = -1
            man2.y -= (man2.JumpCount ** 2) / 2 * neg
            man2.JumpCount -= 1
        else:
            man2.IsJump = False
            man2.JumpCount = 10

    pygame.draw.rect(win, red, (man.x, man.y, man.width, man.height))
    pygame.draw.rect(win, green, (man2.x, man2.y, man2.width, man2.height))
    drawbg()

pygame.quit()

- LittleEggman

---

你可以维护一个时间戳。每次发射子弹时都要更新它，并且只有在时间戳至少为0.5秒时才允许发射子弹。 - Frederik Højlund

Answer 1

您可以检查最后一颗子弹开火的时间。

通过以下方式初始化变量：

import time

last_bullet = time.time()

那么请将您的代码更改为:

if len(bullets) < 5:
    if time.time() - last_bullet > 0.5:
        last_bullet = time.time()
        bullets.append(projectile(man.x + man.width//2, round(man.y + man.height/2), 6, (100, 100, 100), facing))   

- Stef van der Zon

---

这就是正确的做法。如果你不想使用time模块，你也可以使用pygame.time.get_ticks()（但它以毫秒为单位工作，而不是秒）。 - sloth