Hi,
I've just begun trying to teach myself how to program with Python. I'm
currently working through the book 'Hello World, Computer programming
for kids and other beginners' and am stuck on one of the exercises.
The exercise is a take on the SkiFree game.
The error message I get is as follows and occurs in game play when my
skier goes to the far left of the screen:
Traceback (most recent call last):
File "/Users/Chloe/Documents/SKI SKI/ski ski ski", line 99, in <module>
skier.move(speed)
File "/Users/Chloe/Documents/SKI SKI/ski ski ski", line 28, in move
if self.rect.centerx < 20: self.rect.centrex = 20
AttributeError: 'pygame.Rect' object has no attribute 'centrex'
I can't for the life of me figure out what i've done wrong but as i said
i am very new to this all. Enjoying it so far though :)
I'm using Python 2.5 on a Mac
Below is the code. Any help is greatly appreciated as is any advice on
new things to try when attempting to learn Python
Regards Chloe
import pygame, sys, random
skier_images = ["skier_down.png", "skier_right1.png",
"skier_right2.png", "skier_left2.png",
"skier_left1.png"]
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):
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):
self.rect.centerx = self.rect.centerx + speed[0]
if self.rect.centerx < 20: self.rect.centrex = 20
if self.rect.centerx > 620: self.rect.centerx = 620
class ObstacleClass (pygame.sprite.Sprite):
def __init__(self, image_file, location, type):
pygame.sprite.Sprite.__init__(self)
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, t_ptr):
self.rect.centery = self.location[1] - t_ptr
def create_map(start, end):
obstacles = pygame.sprite.Group()
gates = pygame.sprite.Group()
locations = []
for i in range(10):
row = random.randint(start, end)
col = random.randint (0, 9)
location = [col * 64 + 20, row * 64 + 20]
if not (location in locations):
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
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
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
obstacles = updateObstacleGroup(map0, map1)
font = pygame.font.Font(None,50)
while True:
clock.tick(30)
for event in pygame.event.get():
if event.type == pygame.QUIT: sys.exit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
speed = skier.turn(-1)
elif event.key == pygame.K_RIGHT:
speed = skier.turn(1)
skier.move(speed)
map_position += speed[1]
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
map_position = map_position - 1280
map1 = create_map(10, 19)
obstacles = updateObstacleGroup(map0,map1)
for obstacle in obstacles:
obstacle.scroll(map_position)
hit = pygame.sprite.spritecollide(skier, obstacles, False)
if hit:
if hit [0]. type == "tree" and not hit[0].passed:
points = points - 100
skier.image = pygame.image.load("skier_crash.png")
animate()
pygame.time.delay(1000)
skier.image = pygame.image.load("skier_down.png")
skier.angle = 0
speed = [0,6]
hit[0].passed = True
elif hit [0].type == "flag" and not hit [0].passed:
points += 10
obstacles.remove(hit[0])
score_text = font.render("Score: " +str(points), 1, (0, 0, 0))
animate()
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