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bullet.py

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+import math
+from typing import Any
+import random
+import pygame
+from pygame.sprite import Sprite
+
+
+class Bullet(Sprite):  # 子弹的基类
+    def __init__(self, ai_game):  # 此处的ai_game 是一ship对象
+        super().__init__()
+
+        # 获取屏幕设置
+        self.screen = ai_game.screen
+        self.screen_rect = ai_game.screen.get_rect()
+        self.settings = ai_game.settings
+        self.speed_x = 0.0
+        self.speed_y = 5.0
+
+    def update(self, *args: Any, **kwargs: Any) -> None:
+        self.moving()
+
+    def moving(self):
+        self.rect.centerx += self.speed_x
+        self.rect.centery += self.speed_y
+        if self.rect.top > self.screen_rect.height or \
+                self.rect.top < 0 or self.rect.left < 0 or \
+                self.rect.right > self.screen_rect.width:
+            self.kill()
+
+
+class Bullet1(Bullet):  # 按下r键的追踪导弹
+    def __init__(self, ai_game):
+        super().__init__(ai_game)
+        # 获取飞船
+        self.attached_ship = ai_game
+        # 获取子弹的图片
+        self.image = pygame.image.load("resource/image/bullet1.png").convert()
+        self.image.set_colorkey(self.settings.BLACK)
+        self.rect = self.image.get_rect()
+        self.original = None
+        # 子弹速度
+        self.speed = 16
+        self.speed_x = 2
+        self.speed_y = 2
+        # 子弹位置
+        self.rect.center = ai_game.rect.midtop
+        # 子弹跟踪精灵
+        self.target = random.choice(self.settings.aliens.sprites())
+        self.rotate = False  # 图片旋转
+        self.angle = 0
+        self.dis_pos = math.sqrt(pow(self.settings.screen_width, 2) + pow(self.settings.screen_height, 2))
+        # 向量
+        self.vect = pygame.Vector2
+        # 播放声音
+        sound = pygame.mixer.Sound("resource/Bonus/sfx_laser2.ogg")
+        sound.set_volume(0.1)
+        sound.play()
+
+    def update(self, *args: Any, **kwargs: Any) -> None:
+        self.moving()
+
+    def moving(self):
+        # self.get_close_position()
+        if self.target in self.settings.aliens:
+            self.get_enemy_position()
+            if not self.rotate:
+                self.original = self.image
+                self.rotate = True
+            if self.rotate:
+                center = self.rect.center  # 获取旋转前的rect的中心
+                self.image = pygame.transform.rotate(self.original, -self.angle - 90)  # 将原始图片进行旋转，保证不会失真
+                self.rect = self.image.get_rect(center=center)  # 将旋转后的rect的中心与旋转前的中心对齐，保证rect也同图片一起改变
+            angle = self.angle * math.pi / 180
+            self.speed_x = self.speed * math.cos(angle)
+            self.speed_y = self.speed * math.sin(angle)
+            self.rect.centerx += self.speed_x
+            self.rect.centery += self.speed_y * random.randrange(1, 3)
+        elif self.rect.centery < 0 or self.rect.centerx > self.screen_rect.width or self.rect.centerx < 0:
+            self.kill()
+        else:
+            self.rect.centerx += self.speed_x
+            self.rect.centery += self.speed_y
+
+    def get_enemy_position(self):  # 获取导弹和敌人的相对角度
+        pos2 = self.vect(self.target.rect.centerx, self.target.rect.centery)  # 敌人的坐标
+        pos1 = self.vect(self.rect.centerx, self.rect.centery)  # 子弹的坐标
+        pos0 = self.vect(0, 0)
+        self.angle = pos0.angle_to(pos2 - pos1)
+
+    def get_close_position(self):  # 飞船和所有外星人的最短距离、也可以改为子弹和外星人距离最近的,欧几里得距离
+        if len(self.settings.aliens.sprites()) > 0:
+            for alien in self.settings.aliens:
+                pos1 = self.vect(alien.rect.centerx, alien.rect.centery)  # 敌人的位置
+                pos2 = self.vect(self.rect.centerx, self.rect.centery)
+                pos0 = pos2.distance_to(pos1)
+                if pos0 < self.dis_pos:
+                    self.dis_pos = pos0
+                    self.target = alien
+
+
+class Bullet2(Bullet):  # 按下空格的子弹
+    def __init__(self, ai_game):
+        super().__init__(ai_game)
+        # 获取子弹的图片
+        self.image = pygame.image.load("resource/Lasers/laserRed01.png").convert()
+        self.rect = self.image.get_rect()
+        # 子弹设置
+        self.speed_x = 0
+        self.speed_y = 12.0
+        # 子弹的位置
+        self.rect.midbottom = ai_game.rect.midtop
+        # 播放声音
+        sound = pygame.mixer.Sound("resource/Bonus/sfx_laser1.ogg")
+        sound.set_volume(0.2)
+        sound.play()
+
+    def update(self, *args: Any, **kwargs: Any) -> None:
+        self.moving()
+
+    def moving(self):
+        self.rect.x += self.speed_x
+        self.rect.y -= self.speed_y
+        if self.rect.bottom < 0:
+            self.kill()
+
+
+class Bullet3(Bullet):  # 敌人的子弹类
+    def __init__(self, ai_game):
+        super(Bullet3, self).__init__(ai_game)
+        # 获取子弹的图片
+        self.image = pygame.image.load("resource/image/bullet3.png")
+        self.image = pygame.transform.rotate(self.image, 180)
+        self.rect = self.image.get_rect()
+        self.rect.bottom = ai_game.rect.bottom
+        # 子弹的固定位置
+        self.angle = ai_game.angle
+        self.speed = 5.0
+        self.speed_x = self.speed * math.cos(self.angle)
+        self.speed_y = self.speed * math.sin(self.angle)
+
+    def update(self, *args: Any, **kwargs: Any) -> None:
+        self.moving()
+
+
+class Bullet4(Bullet):  # 敌人的子弹类
+    def __init__(self, ai_game):
+        super().__init__(ai_game)
+        # 获取子弹的图片
+        self.image = pygame.image.load("resource/Lasers/laserBlue03.png")
+        self.image = pygame.transform.rotate(self.image, 180)
+        self.rect = self.image.get_rect()
+        # 子弹的固定位置
+        self.rect.center = ai_game.rect.midbottom
+        # 子弹速度
+        self.speed_y = 8.0
+
+    def update(self, *args: Any, **kwargs: Any) -> None:
+        self.moving()
+
+
+class Bullet5(Bullet):  # boss的子弹类
+    def __init__(self, ai_game):
+        super().__init__(ai_game)
+        # 获取子弹的图片
+        self.images = self.settings.light_images
+        self.frame = 0
+        self.image = self.images[self.frame]
+        self.image = pygame.transform.scale2x(self.image)
+        self.rect = self.image.get_rect()
+        self.last_frame = 9
+        self.temp = 0
+        self.rect.center = ai_game.rect.midbottom
+        # 子弹速度
+        self.speed_y = 8.0
+
+    def update(self, *args: Any, **kwargs: Any) -> None:
+        self.change()
+        self.moving()
+
+    def change(self):
+        if self.frame <= self.last_frame and self.temp == 0:
+            self.image = self.images[self.frame]
+            self.image = pygame.transform.scale2x(self.image)
+            self.frame += 1
+            if self.frame >= 10:
+                self.temp = 1
+        elif self.temp == 1:
+            self.frame -= 1
+            self.image = self.images[self.frame]
+            self.image = pygame.transform.scale2x(self.image)
+            if self.frame == 0:
+                self.temp = 0