pygame 精灵的行走及二段跳的实现方法(必看篇)

不得不承认《Python游戏编程入门》这本书翻译、排版非常之烂，但是里面的demo还是很好的，之前做了些改编放到这里。

先是素材：

背景

精灵

所有素材均取自此书

接下来就是精灵类的创建了：

class MySprite(pygame.sprite.Sprite):  def __init__(self, target):    pygame.sprite.Sprite.__init__(self)    self.master_image = None    self.frame = 0    self.old_frame = -1    self.frame_width = 1    self.frame_height = 1    self.first_frame = 0    self.last_frame = 0    self.columns = 1    self.last_time = 0  #　　使用property方法，让精灵类对坐标操作更方便  def _getx(self):    return self.rect.x  def _setx(self, value):    self.rect.x = value  X = property(_getx, _setx)  def _gety(self):    return self.rect.y  def _sety(self, value):    self.rect.y = value  Y = property(_gety, _sety)  def _getpos(self):    return self.rect.topleft  def _setpos(self, pos):    self.rect.topleft = pos  position = property(_getpos, _setpos)　　#　　load方法中定义了图片位置，长宽和帧的列数，由此来将素材切成一帧一帧  def load(self, filename, width, height, columns):    self.master_image = pygame.image.load(filename).convert_alpha()    self.frame_width = width    self.frame_height = height    self.rect = Rect(0, 0, width, height)    self.columns = columns    rect = self.master_image.get_rect()    self.last_frame = (rect.width // width) * (rect.height // height) - 1  def update(self, current_time, rate=30):    #　　更新帧数    if current_time > self.last_time + rate:      self.frame += 1      if self.frame > self.last_frame:        self.frame = self.first_frame      self.last_time = current_time    #　　当帧数发生改变时，创建新的图片    if self.frame != self.old_frame:      frame_x = (self.frame % self.columns) * self.frame_width      frame_y = (self.frame // self.columns) * self.frame_height      rect = Rect(frame_x, frame_y, self.frame_width, self.frame_height)      self.image = self.master_image.subsurface(rect)      self.old_frame = self.frame

将精灵类“放置”到游戏屏幕上，并加上背景

pygame.init()screen = pygame.display.set_mode((800, 600))font = pygame.font.Font(None, 24)framerate = pygame.time.Clock()bg = pygame.image.load("background.png").convert_alpha()pl = pygame.image.load('caveman.png').convert_alpha()# 创建精灵组group = pygame.sprite.Group()player = MySprite(screen)player.load("caveman.png", 50, 64, 8)player.first_frame = 1player.last_frame = 7player.position = 400, 303group.add(player)while True:  for event in pygame.event.get():    if event.type == QUIT:      sys.exit()  #  设置帧数  framerate.tick(30)  ticks = pygame.time.get_ticks()