One of the great traditions of learning to program is typing in code you don’t understand. Really！（引用自《父与子的编程之旅》第十章第一句）那么我们开始吧！
Skier
输入中就发现了，作者说得真对！I,m typing in code I don’t understand！
对class和def完全无感，完全只能照着作者的程序练习打字。
但是执行后出来游戏窗口还是挺有成就感的！
接下去慢慢地把这段代码消化掉吧[流泪]
import pygame, sys, random
# different images for the skier depending on his direction
skier_images = ["skier_down.png", "skier_right1.png", "skier_right2.png",
"skier_left2.png", "skier_left1.png"]
# class for the skier sprite
class SkierClass(pygame.sprite.Sprite):
def __init__(self):
pygame.sprite.Sprite.__init__(self)
self.image = pygame.image.load("skier_down.png")
self.rect = self.image.get_rect()
self.rect.center = [320, 100]
self.angle = 0
def turn(self, direction):
# load new image and change speed when the skier turns
self.angle = self.angle direction
if self.angle < -2: self.angle = -2
if self.angle > 2: self.angle = 2
center = self.rect.center
self.image = pygame.image.load(skier_images[self.angle])
self.rect = self.image.get_rect()
self.rect.center = center
speed = [self.angle, 6 - abs(self.angle) * 2]
return speed
def move(self, speed):
# move the skier right and left
self.rect.centerx = self.rect.centerx speed[0]
if self.rect.centerx < 20: self.rect.centerx = 20
if self.rect.centerx > 620: self.rect.centerx = 620
# class for obstacle sprites (trees and flags)
class ObstacleClass(pygame.sprite.Sprite):
def __init__(self, image_file, location, type):
pygame.sprite.Sprite.__init__(self) #call Sprite initializer
self.image_file = image_file
self.image = pygame.image.load(image_file)
self.location = location
self.rect = self.image.get_rect()
self.rect.center = location
self.type = type
self.passed = False
def scroll(self, terrainPos):
self.rect.centery = self.location[1] - terrainPos
# create one "screen" of terrain: 640 x 640
# use "blocks" of 64 x 64 pixels, so objects aren't too close together
def create_map(start, end):
obstacles = pygame.sprite.Group()
locations = []
gates = pygame.sprite.Group()
for i in range(10): # 10 obstacles per screen
row = random.randint(start, end)
col = random.randint(0, 9)
location = [col * 64 20, row * 64 20] #center x, y for obstacle
if not (location in locations): # prevent 2 obstacles in the same place
locations.append(location)
type = random.choice(["tree", "flag"])
if type == "tree": img = "skier_tree.png"
elif type == "flag": img = "skier_flag.png"
obstacle = ObstacleClass(img, location, type)
obstacles.add(obstacle)
return obstacles
# redraw the screen, including all sprites
def animate():
screen.fill([255, 255, 255])
pygame.display.update(obstacles.draw(screen))
screen.blit(skier.image, skier.rect)
screen.blit(score_text, [10, 10])
pygame.display.flip()
def updateObstacleGroup(map0, map1):
obstacles = pygame.sprite.Group()
for ob in map0: obstacles.add(ob)
for ob in map1: obstacles.add(ob)
return obstacles
# initialize everything
pygame.init()
screen = pygame.display.set_mode([640,640])
clock = pygame.time.Clock()
skier = SkierClass()
speed = [0, 6]
map_position = 0
points = 0
map0 = create_map(20, 29)
map1 = create_map(10, 19)
activeMap = 0
# group for all obstacles to do collision detection
obstacles = updateObstacleGroup(map0, map1)
# font object for score
font = pygame.font.Font(None, 50)
# main Pygame event loop
while True:
clock.tick(30)
for event in pygame.event.get():
if event.type == pygame.QUIT: sys.exit()
if event.type == pygame.KEYDOWN: # check for key presses
if event.key == pygame.K_LEFT: # left arrow turns left
speed = skier.turn(-1)
elif event.key == pygame.K_RIGHT: #right arrow turns right
speed = skier.turn(1)
skier.move(speed)
map_position = speed[1] # scroll the terrain
# manage terrain maps, switch between them,
# and create new terrain at the bottom
if map_position >=640 and activeMap == 0:
activeMap = 1
map0 = create_map(20, 29)
obstacles = updateObstacleGroup(map0, map1)
if map_position >=1280 and activeMap == 1:
activeMap = 0
for ob in map0:
ob.location[1] = ob.location[1] - 1280 # wrap around to top
map_position = map_position - 1280 #
map1 = create_map(10, 19)
obstacles = updateObstacleGroup(map0, map1)
for obstacle in obstacles:
obstacle.scroll(map_position)
# check for hitting trees or getting flags
hit = pygame.sprite.spritecollide(skier, obstacles, False)
if hit:
if hit[0].type == "tree" and not hit[0].passed: #crashed into tree
points = points - 100
skier.image = pygame.image.load("skier_crash.png") # crash image
animate()
pygame.time.delay(1000)
skier.image = pygame.image.load("skier_down.png") # resume skiing
skier.angle = 0
speed = [0, 6]
hit[0].passed = True
elif hit[0].type == "flag" and not hit[0].passed: # got a flag
points = 10
obstacles.remove(hit[0]) # remove the flag
score_text = font.render("Score: " str(points), 1, (0, 0, 0))
animate()
