pygame发射子弹

发射子弹

import sys  # 用以退出程序
import pygame  # import库
from pygame.sprite import Group

bg_color = 230,230,230
class Ship:
    def __init__(self,screen):
        self.screen = screen
        self.image = pygame.image.load('images/ship.bmp').convert_alpha()
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()
        self.rect.midbottom = self.screen_rect.midbottom
        self.moving_right = False
        self.center_x = float(self.rect.centerx)
        self.center_y = float(self.rect.centerx)
        self.ship_speed_factor = 5
        self.bullets_allowed = 10



    def blitme(self):
        self.screen.blit(self.image,self.rect)

    def update(self):

        if self.moving_right and self.rect.right < self.screen_rect.right:
            self.center_x += self.ship_speed_factor
            self.rect.centerx = self.center_x


class Bullet(pygame.sprite.Sprite):
    def __init__(self,screen,ship):
        pygame.sprite.Sprite.__init__(self)

        self.screen = screen
        self.bullet_width = 3
        self.bullet_height = 10
        self.bullet_color = 6,60,160
        self.speed_factor = 10  # 设置速度
        self.rect = pygame.Rect(0, 0, self.bullet_width, self.bullet_height)  # 定义左边为屏幕的左上角出现一个长宽固定的矩形
        self.rect.top = ship.rect.top
        self.rect.centerx = ship.rect.centerx
        self.y = float(self.rect.y)

    def update(self):
        self.y -= self.speed_factor
        self.rect.centery = self.y

    def draw_bullet(self):
        pygame.draw.rect(self.screen,self.bullet_color,self.rect)



def remove_bullet(bullets):
    for i in bullets.copy():
        if i.rect.bottom <= 0:
            bullets.remove(i)


def run_game():
    pygame.init()  # 初始化
    screen = pygame.display.set_mode((1000, 800))  # 返回一个屏幕 此时出现一个窗口
    pygame.display.set_caption("ship")  # 设置窗口的标题
    bullets = Group()
    flyboat = Ship(screen)

    while True:  # 死循环
        for event in pygame.event.get():  # 检测用户的键盘鼠标等输入
            if event.type == pygame.QUIT:  # 此处仅检测是否退出
                sys.exit()  # 退出

            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_RIGHT:
                    flyboat.moving_right = True

                elif event.key == pygame.K_SPACE:
                    if len(bullets) < flyboat.bullets_allowed:
                        new_bullet = Bullet(screen, flyboat)
                        bullets.add(new_bullet)

            elif event.type == pygame.KEYUP:  # key up
                if event.key == pygame.K_RIGHT:
                    flyboat.moving_right = False



        screen.fill(bg_color)
        flyboat.blitme()
        for i in bullets:
            i.draw_bullet()
            i.update()
        remove_bullet(bullets)
        pygame.display.flip()  # 绘制一个新屏幕 并擦去旧屏幕 以形成平滑移动


run_game()
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