Example_3.py

import sys
import cfg
import pygame
import random


'''滑雪者类'''
class SkierClass(pygame.sprite.Sprite):
  def __init__(self):
      pygame.sprite.Sprite.__init__(self)
      # 滑雪者的朝向(-2到2)
      self.direction = 0
      self.imagepaths = cfg.SKIER_IMAGE_PATHS[:-1]
      self.image = pygame.image.load(self.imagepaths[self.direction])
      self.rect = self.image.get_rect()
      self.rect.center = [320, 100]
      self.speed = [self.direction, 6-abs(self.direction)*2]
  '''改变滑雪者的朝向. 负数为向左，正数为向右，0为向前'''
  def turn(self, num):
      self.direction += num
      self.direction = max(-2, self.direction)
      self.direction = min(2, self.direction)
      center = self.rect.center
      self.image = pygame.image.load(self.imagepaths[self.direction])
      self.rect = self.image.get_rect()
      self.rect.center = center
      self.speed = [self.direction, 6-abs(self.direction)*2]
      return self.speed
  '''移动滑雪者'''
  def move(self):
      self.rect.centerx += self.speed[0]
      self.rect.centerx = max(20, self.rect.centerx)
      self.rect.centerx = min(620, self.rect.centerx)
  '''设置为摔倒状态'''
  def setFall(self):
      self.image = pygame.image.load(cfg.SKIER_IMAGE_PATHS[-1])
  '''设置为站立状态'''
  def setForward(self):
      self.direction = 0
      self.image = pygame.image.load(self.imagepaths[self.direction])


'''
Function:
  障碍物类
Input:
  img_path: 障碍物图片路径
  location: 障碍物位置
  attribute: 障碍物类别属性
'''
class ObstacleClass(pygame.sprite.Sprite):
  def __init__(self, img_path, location, attribute):
      pygame.sprite.Sprite.__init__(self)
      self.img_path = img_path
      self.image = pygame.image.load(self.img_path)
      self.location = location
      self.rect = self.image.get_rect()
      self.rect.center = self.location
      self.attribute = attribute
      self.passed = False
  '''移动'''
  def move(self, num):
      self.rect.centery = self.location[1] - num


'''创建障碍物'''
def createObstacles(s, e, num=10):
  obstacles = pygame.sprite.Group()
  locations = []
  for i in range(num):
      row = random.randint(s, e)
      col = random.randint(0, 9)
      location  = [col*64+20, row*64+20]
      if location not in locations:
          locations.append(location)
          attribute = random.choice(list(cfg.OBSTACLE_PATHS.keys()))
          img_path = cfg.OBSTACLE_PATHS[attribute]
          obstacle = ObstacleClass(img_path, location, attribute)
          obstacles.add(obstacle)
  return obstacles


'''合并障碍物'''
def AddObstacles(obstacles0, obstacles1):
  obstacles = pygame.sprite.Group()
  for obstacle in obstacles0:
      obstacles.add(obstacle)
  for obstacle in obstacles1:
      obstacles.add(obstacle)
  return obstacles


'''显示游戏开始界面'''
def ShowStartInterface(screen, screensize):
  screen.fill((255, 255, 255))
  tfont = pygame.font.Font(cfg.FONTPATH, screensize[0]//5)
  cfont = pygame.font.Font(cfg.FONTPATH, screensize[0]//20)
  title = tfont.render(u'滑雪游戏', True, (255, 0, 0))
  content = cfont.render(u'按任意键开始游戏', True, (0, 0, 255))
  trect = title.get_rect()
  trect.midtop = (screensize[0]/2, screensize[1]/5)
  crect = content.get_rect()
  crect.midtop = (screensize[0]/2, screensize[1]/2)
  screen.blit(title, trect)
  screen.blit(content, crect)
  while True:
      for event in pygame.event.get():
          if event.type == pygame.QUIT:
              pygame.quit()
              sys.exit()
          elif event.type == pygame.KEYDOWN:
              return
      pygame.display.update()


'''显示分数'''
def showScore(screen, score, pos=(10, 10)):
  font = pygame.font.Font(cfg.FONTPATH, 30)
  score_text = font.render("Score: %s" % score, True, (0, 0, 0))
  screen.blit(score_text, pos)


'''更新当前帧的游戏画面'''
def updateFrame(screen, obstacles, skier, score):
  screen.fill((255, 255, 255))
  obstacles.draw(screen)
  screen.blit(skier.image, skier.rect)
  showScore(screen, score)
  pygame.display.update()


'''主程序'''
def main():
  # 游戏初始化
  pygame.init()
  pygame.mixer.init()
  pygame.mixer.music.load(cfg.BGMPATH)
  pygame.mixer.music.set_volume(0.4)
  pygame.mixer.music.play(-1)
  # 设置屏幕
  screen = pygame.display.set_mode(cfg.SCREENSIZE)
  pygame.display.set_caption('滑雪游戏 —— 九歌')
  # 游戏开始界面
  ShowStartInterface(screen, cfg.SCREENSIZE)
  # 实例化游戏精灵
  # --滑雪者
  skier = SkierClass()
  # --创建障碍物
  obstacles0 = createObstacles(20, 29)
  obstacles1 = createObstacles(10, 19)
  obstaclesflag = 0
  obstacles = AddObstacles(obstacles0, obstacles1)
  # 游戏clock
  clock = pygame.time.Clock()
  # 记录滑雪的距离
  distance = 0
  # 记录当前的分数
  score = 0
  # 记录当前的速度
  speed = [0, 6]
  # 游戏主循环
  while True:
      # --事件捕获
      for event in pygame.event.get():
          if event.type == pygame.QUIT:
              pygame.quit()
              sys.exit()
          if event.type == pygame.KEYDOWN:
              if event.key == pygame.K_LEFT or event.key == pygame.K_a:
                  speed = skier.turn(-1)
              elif event.key == pygame.K_RIGHT or event.key == pygame.K_d:
                  speed = skier.turn(1)
      # --更新当前游戏帧的数据
      skier.move()
      distance += speed[1]
      if distance >= 640 and obstaclesflag == 0:
          obstaclesflag = 1
          obstacles0 = createObstacles(20, 29)
          obstacles = AddObstacles(obstacles0, obstacles1)
      if distance >= 1280 and obstaclesflag == 1:
          obstaclesflag = 0
          distance -= 1280
          for obstacle in obstacles0:
              obstacle.location[1] = obstacle.location[1] - 1280
          obstacles1 = createObstacles(10, 19)
          obstacles = AddObstacles(obstacles0, obstacles1)
      for obstacle in obstacles:
          obstacle.move(distance)
      # --碰撞检测
      hitted_obstacles = pygame.sprite.spritecollide(skier, obstacles, False)
      if hitted_obstacles:
          if hitted_obstacles[0].attribute == "tree" and not hitted_obstacles[0].passed:
              score -= 50
              skier.setFall()
              updateFrame(screen, obstacles, skier, score)
              pygame.time.delay(1000)
              skier.setForward()
              speed = [0, 6]
              hitted_obstacles[0].passed = True
          elif hitted_obstacles[0].attribute == "flag" and not hitted_obstacles[0].passed:
              score += 10
              obstacles.remove(hitted_obstacles[0])
      # --更新屏幕
      updateFrame(screen, obstacles, skier, score)
      clock.tick(cfg.FPS)


'''run'''
if __name__ == '__main__':
  main()；