飞机移动及发射导弹

boss.py

@@ -45,4 +45,54 @@ class BossPlane(EnemyPlane):
         if self.rect[0] < leftX or self.rect[0] > rightX:
             self.speed = -self.speed
         self.rect[0] += self.speed
- 
+        # 如果飞机移动出屏幕则将飞机设置为初始
+        if self.rect[1] > self.main_scene.size[1]:
+            self.set_pos(240, 0)
+
+        self.interval_index += 1
+        if self.interval_index < self.interval:
+            return
+        self.interval_index = 0
+
+        self.index = self.index + 1
+        if self.index >= len(self.images):
+            self.index = 0
+            self.visible = False
+        self.image = self.images[self.index]
+        self.mask = pygame.mask.from_surface(self.image)
+
+    def shot(self):
+        starttime = pygame.time.get_ticks()
+        passtime = starttime - self.endtime
+        if passtime < self.interval:
+            return
+        self.endtime = starttime
+
+        # 每次发射三颗子弹
+        wait_for_shot = []
+        # 从子弹列表取出3颗目前尚未发射的子弹
+        # 如果子弹的visible为false，说明子弹尚未发射
+        for bullet in self.bullets:
+            # 如果子弹不可见,说明子弹闲置状态
+            if not bullet.visible:
+                wait_for_shot.append(bullet)
+                if len(wait_for_shot) >= 3:
+                    break
+        # 子弹发射位置，从posx位置开始 向右排列三颗子弹
+        posx = self.rect[0] - 15
+        # 依次设置选择子弹的初始位置，并将其设置为发射状态、移动速度
+        for bullet in wait_for_shot:
+            bullet.visible = True
+            posx = posx + 30
+            bullet.set_speed(4)
+            bullet.set_pos(posx + 3, self.rect[1] + self.rect[3] / 2)
+
+    def draw(self):
+        for bullet in self.bullets:
+            if bullet.visible:
+                bullet.draw()
+        # if not self.visible:
+        #     return
+        self.main_scene.scene.blit(
+            self.images[self.index], (self.rect[0], self.rect[1]))
+        # print('BOSS HP' + str(self.HP))