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obstacle.py

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+'''
+定义躲避物类
+'''
+import random
+import pygame
+
+
+'''仙人掌'''
+class Cactus(pygame.sprite.Sprite):
+	def __init__(self, imagepaths, position=(600, 147), sizes=[(40, 40), (40, 40)], **kwargs):
+		pygame.sprite.Sprite.__init__(self)
+		# 导入图片
+		self.images = []
+		image = pygame.image.load(imagepaths[0])
+		for i in range(3):
+			self.images.append(pygame.transform.scale(image.subsurface((i*101, 0), (101, 101)), sizes[0]))
+		image = pygame.image.load(imagepaths[1])
+		for i in range(3):
+			self.images.append(pygame.transform.scale(image.subsurface((i*68, 0), (68, 70)), sizes[1]))
+		self.image = random.choice(self.images)
+		self.rect = self.image.get_rect()
+		self.rect.left, self.rect.bottom = position
+		self.mask = pygame.mask.from_surface(self.image)
+		# 定义一些必要的变量
+		self.speed = -10
+	'''画到屏幕上'''
+	def draw(self, screen):
+		screen.blit(self.image, self.rect)
+	'''更新'''
+	def update(self):
+		self.rect = self.rect.move([self.speed, 0])
+		if self.rect.right < 0:
+			self.kill()
+
+
+'''飞龙'''
+class Ptera(pygame.sprite.Sprite):
+	def __init__(self, imagepath, position, size=(46, 40), **kwargs):
+		pygame.sprite.Sprite.__init__(self)
+		# 导入图片
+		self.images = []
+		image = pygame.image.load(imagepath)
+		for i in range(2):
+			self.images.append(pygame.transform.scale(image.subsurface((i*92, 0), (92, 81)), size))
+		self.image_idx = 0
+		self.image = self.images[self.image_idx]
+		self.rect = self.image.get_rect()
+		self.rect.left, self.rect.centery = position
+		self.mask = pygame.mask.from_surface(self.image)
+		# 定义一些必要的变量
+		self.speed = -10
+		self.refresh_rate = 10
+		self.refresh_counter = 0
+	'''画到屏幕上'''
+	def draw(self, screen):
+		screen.blit(self.image, self.rect)
+	'''更新'''
+	def update(self):
+		if self.refresh_counter % self.refresh_rate == 0:
+			self.refresh_counter = 0
+			self.image_idx = (self.image_idx + 1) % len(self.images)
+			self.loadImage()
+		self.rect = self.rect.move([self.speed, 0])
+		if self.rect.right < 0:
+			self.kill()
+		self.refresh_counter += 1
+	'''载入当前状态的图片'''
+	def loadImage(self):
+		self.image = self.images[self.image_idx]
+		rect = self.image.get_rect()
+		rect.left, rect.top = self.rect.left, self.rect.top
+		self.rect = rect
+		self.mask = pygame.mask.from_surface(self.image)