pygame.sprite.Sprite 中的wenti

“”"
Snake Game template, using classes.

Derived from:
Sample Python/Pygame Programs
Simpson College Computer Science
http://programarcadegames.com/
http://simpson.edu/computer-science/

“”"

import pygame
import random

— Globals —

Colors

BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
GREEN = (0, 255, 0)

Screen size

height = 600
width = 600

Margin between each segment

segment_margin = 3

Set the width and height of each snake segment

segment_width = min(height, width) / 40 - segment_margin
segment_height = min(height, width) / 40 - segment_margin

Set initial speed

x_change = segment_width + segment_margin
y_change = 0
position=[ i for i in range(0, 600, 15)]

class Snake():
“”" Class to represent one snake. “”"

# Constructor
def __init__(self):

    # Food().__init__()
    # Sfoodlists = Food().foodlists
    # Sfoodlist = Food().foodlist

    self.segments = []
    self.spriteslist = pygame.sprite.Group()
    for i in range(15):
        x = (segment_width + segment_margin) * 30 - (segment_width + segment_margin) * i
        y = (segment_height + segment_margin) * 2
        segment = Segment(x, y)
        self.segments.append(segment)
        self.spriteslist.add(segment)
        
def move(self):
    # Figure out where new segment will be
    x = self.segments[0].rect.x + x_change
    y = self.segments[0].rect.y + y_change
    
    # Don't move off the screen
    # At the moment a potential move off the screen means nothing happens, but it should end the game
    if 0 <= x <= width - segment_width and 0 <= y <= height - segment_height:  
    
    # Insert new segment into the list
        segment = Segment(x, y)
        self.segments.insert(0, segment)
        self.spriteslist.add(segment)
    # Get rid of last segment of the snake
    # .pop() command removes last item in list
        old_segment = self.segments.pop()
        self.spriteslist.remove(old_segment)
    self.eat()



def eat(self):
    print(self.segments[0].rect,"1")
    hit_list = pygame.sprite.spritecollide(self.segments[0], Food().foodlist,True)
    # print(self.Sfoodlist)
    print(Food().foodlists[0].rect,"2")
    # if hit_list  != []:
    #     newfoodlists = Food().foodlists.remove(hit_list[0])
    #     print(newfoodlists)
    #     for w in newfoodlists:
    #         Food_item(w)

class Segment(pygame.sprite.Sprite):
“”" Class to represent one segment of a snake. “”"

# Constructor
def __init__(self, x, y):
    # Call the parent's constructor
    super().__init__()

    # Set height, width
    self.image = pygame.Surface([segment_width, segment_height])
    self.image.fill(WHITE)

    # Set top-left corner of the bounding rectangle to be the passed-in location.
    self.rect = self.image.get_rect()
    self.rect.x = x
    self.rect.y = y

class Food():
def init(self):
self.foodlists = []
self.foodlist = pygame.sprite.Group()

    for i in range(1):
        x = random.choice([i for i in range(0, 600, 15)])
        y = random.choice([i for i in range(0, 600, 15)])
        fooditem = Food_item(x, y)
        self.foodlists.append(fooditem)
        self.foodlist.add(fooditem)

class Food_item(pygame.sprite.Sprite):
def init(self, fx, fy):
# Call the parent’s constructor
super().init()
# Set height, width
self.image = pygame.Surface([segment_width, segment_height])
self.image.fill(RED)

    # Set top-left corner of the bounding rectangle to be the passed-in location.
    self.rect = self.image.get_rect()
    self.rect.x = fx
    self.rect.y = fy

class Food_item(pygame.sprite.Sprite):

Call this function so the Pygame library can initialize itself

pygame.init()

Create a 600x600 sized screen

screen = pygame.display.set_mode([width, height])

Set the title of the window

pygame.display.set_caption(‘Snake Game’)

Create an initial snake

my_snake = Snake()
food = Food()

print(food.foodlists[0].rect)

S = Segment(10,150)

print(S.rect,“pp”)

clock = pygame.time.Clock()
done = False

while not done:
print(food.foodlists[0].rect)
for event in pygame.event.get():
if event.type == pygame.QUIT:
done = True

    # Set the direction based on the key pressed
    # We want the speed to be enough that we move a full
    # segment, plus the margin.
    if event.type == pygame.KEYDOWN:
        if event.key == pygame.K_LEFT:
            x_change = (segment_width + segment_margin) * -1
            y_change = 0
        if event.key == pygame.K_RIGHT:
            x_change = (segment_width + segment_margin)
            y_change = 0
        if event.key == pygame.K_UP:
            x_change = 0
            y_change = (segment_height + segment_margin) * -1
        if event.key == pygame.K_DOWN:
            x_change = 0
            y_change = (segment_height + segment_margin)
    # hit_list = pygame.sprite.spritecollide(S, f, True)


# move snake one step
my_snake.move()

# -- Draw everything
# Clear screen
screen.fill(BLACK)
my_snake.spriteslist.draw(screen)
food.foodlist.draw(screen)

# Flip screen
pygame.display.flip()

# Pause
clock.tick(5)

pygame.quit()

为什么在同一个红色方点处 rect.x和rect.y的值不同