1     # 加载各种状态的图片序列
 2     def load_images(self):
 3         # 站立状态的图片
 4         self.standing_frames = [self.game.spritesheet.get_image("bunny1_ready.png"),
 5                                 self.game.spritesheet.get_image("bunny1_stand.png")]
 6
 7         # 向右走的图片
 8         self.walking_frames_right = [self.game.spritesheet.get_image("bunny1_walk1.png"),
 9                                      self.game.spritesheet.get_image("bunny1_walk2.png")]
10
11         # 向左走的图片
12         self.walking_frames_left = []
13         for frame in self.walking_frames_right:
14             # 向左走的图片，只需要把向"右"走的图片，水平(x)方向翻转即可
15             self.walking_frames_left.append(pg.transform.flip(frame, True, False))
16
17         # 跳跃状态的图片
18         self.jump_frame = self.game.spritesheet.get_image("bunny1_jump.png")

 1 class Player(pg.sprite.Sprite):
 2
 3     def __init__(self, game):
 4         pg.sprite.Sprite.__init__(self)
 5         self.game = game
 6         # 是否在行走状态
 7         self.walking = False
 8         # 是否处于跳跃状态
 9         self.jumping = False
10         # 当前状态的动画，显示的是哪一"帧"
11         self.current_frame = 0
12         # 当前状态的动画，最后一次切换是什么时候？
13         self.last_update = 0
14         # 加载图片
15         self.load_images()
16         # 初始状态为"站立"
17         self.image = self.standing_frames[0]
18
19         ...

1     def jump(self):
2         hits = pg.sprite.spritecollide(self, self.game.platforms, False)
3         if hits:
4             self.vel.y = -PLAYER_JUMP
5             # 修改跳跃状态
6             self.jumping = True

    # 动画处理def animate(self):now = pg.time.get_ticks()# 更新walking状态if self.vel.x != 0:self.walking = Trueelse:self.walking = False# 垂直方向速度为0，认为未跳跃if abs(self.vel.y) < 0.5:self.jumping = False# 切换jumping图片if self.jumping:self.image = self.jump_frameelse:self.image = self.standing_frames[0]if not self.jumping and not self.walking:# 调节这里的200,可以控制动画的播放速度if now - self.last_update > 200:self.last_update = nowself.current_frame += 1# bunny1_ready.png与bunny1_stand.png的高度不同，所以切换后，要调整bottom值，保证图片的最下边缘正好站在档板上old_bottom = self.rect.bottomself.image = self.standing_frames[self.current_frame % len(self.standing_frames)]self.rect = self.image.get_rect()self.rect.bottom = old_bottom

    def update(self):# 动画处理
        self.animate()self.acc = vec(0, PLAYER_GRAVITY)keys = pg.key.get_pressed()if keys[pg.K_LEFT]:self.acc.x = -PLAYER_ACCif keys[pg.K_RIGHT]:self.acc.x = PLAYER_ACCself.acc.x += self.vel.x * PLAYER_FRICTIONself.vel += self.accself.pos += self.vel# 因为walking状态的切换，依赖于x速度是否为0判断，当x在0左右的极小值摆动时，会导致判断出错if abs(self.vel.x) < 0.5:self.vel.x = 0...