初始化子弹及其速度

bullet.py

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+import pygame
+# 子弹
+
+
+class Bullet(object):
+    # 初始化子弹
+    def __init__(self, scene, enemy=False, type=1):
+        # 子弹移动速度
+        self.speed = 2
+        # 是否是敌人子弹
+        self.is_enemy = enemy
+        # self.is_boss = boss
+        self.type = type
+        self.image = pygame.image.load("./images/bullet/enemybullet1.png")
+        # 子弹资源
+        if self.is_enemy:
+            if self.type == 1:
+                # 加载敌人子弹图片
+                self.image = pygame.image.load(
+                    "./images/bullet/enemybullet1.png")
+                # 设置子弹移动方向
+                self.speed = self.speed
+            elif self.type == 2:
+                 # 加载敌人子弹图片
+                self.image = pygame.image.load(
+                    "./images/bullet/enemybullet2.png")
+                # 设置子弹移动方向
+                self.speed = self.speed + 2
+            elif self.type == 3:
+                 # 加载敌人子弹图片
+                self.image = pygame.image.load(
+                    "./images/bullet/enemybullet3.png")
+                # 设置子弹移动方向
+                self.speed = self.speed + 4
+            elif self.type == 0:  # BOSS
+                self.image = pygame.image.load(
+                    "./images/bullet/bossbullet.png")
+                self.speed = 4
+            else:
+                 # 加载敌人子弹默认图片
+                self.image = pygame.image.load(
+                    "./images/bullet/enemybullet1.png")
+                # 设置子弹移动方向
+                self.speed = self.speed
+        else:
+            # 加载英雄子弹图片
+            self.image = pygame.image.load("./images/bullet/herobullet.png")
+            # 设置子弹移动方向
+            self.speed = -self.speed
+
+        self.visible = False
+        # 持有主场景对象
+        self.main_scene = scene
+        # 获得子弹矩形(x, y, width, height)
+        self.rect = self.image.get_rect()
+
+