Question

我正在使用python和pygame完成programarcadegames实验室，我被卡住了。当我运行此代码时，我在初始化块和播放器类时做错了。玩家类应该是它自己的类，而不是Block类的实例。

当我运行此程序时，我收到此错误： 'Block'对象没有属性'changespeed'

import pygame
import random

# Define some colors
BLACK = (  0,   0,   0)
WHITE = (255, 255, 255)
RED   = (255,   0,   0)
BLUE   = (0,   0,   255)

class Block(pygame.sprite.Sprite):

    def __init__(self, color, width, height):
        """ Constructor. Pass in the color of the block,
        and its x and y position. """

        # Call the parent class (Sprite) constructor
        super().__init__()

        # Create an image of the block, and fill it with a color.
        # This could also be an image loaded from the disk.
        self.image = pygame.Surface([width, height])
        self.image.fill(color)

        # Fetch the rectangle object that has the dimensions of the image
        # image.
        # Update the position of this object by setting the values
        # of rect.x and rect.y
        self.rect = self.image.get_rect()

class Player (pygame.sprite.Sprite):
    """ The class is the player-controlled sprite. """

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

        # -- methods
        # Set height, width
        self.image = pygame.Surface([15, 15])
        self.image.fill(BLACK)

        # Make our top-left corner the passed-in location.
        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y

        # -- Attributes
        # Set speed vector
        self.change_x = 0
        self.change_y = 0

    def changespeed(self, x, y):
        """ Change the speed of the player"""
        self.change_x += x
        self.change_y += y

    def update(self):
        """ Find a new position for the player"""
        self.rect.x += self.change_x
        self.rect.y += self.change_y

# Initialize Pygame
pygame.init()

# Set the height and width of the screen
screen_width = 700
screen_height = 400
screen = pygame.display.set_mode([screen_width, screen_height])

# This is a list of 'sprites.' Each block in the program is
# added to this list. The list is managed by a class called 'Group.'
block_list = pygame.sprite.Group()

# This is a list of every sprite. 
# All blocks and the player block as well.
all_sprites_list = pygame.sprite.Group()

for i in range(50):
    # This represents a block
    block = Block(BLACK, 20, 15)

    # Set a random location for the block
    block.rect.x = random.randrange(screen_width)
    block.rect.y = random.randrange(screen_height)

    # Add the block to the list of objects
    block_list.add(block)
    all_sprites_list.add(block)

# Create a RED player block
player = Block(BLUE, 20, 15)
all_sprites_list.add(player)

# Loop until the user clicks the close button.
done = False

# Used to manage how fast the screen updates
clock = pygame.time.Clock()

score = 0

# -------- Main Program Loop -----------
while not done:
    for event in pygame.event.get(): 
        if event.type == pygame.QUIT: 
            done = True
        # Set the speed based on the key pressed
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                player.changespeed(-3, 0)
            elif event.key == pygame.K_RIGHT:
                player.changespeed(3, 0)
            elif event.key == pygame.K_UP:
                player.changespeed(0, -3)
            elif event.key == pygame.K_DOWN:
                player.changespeed(0, 3)

        # Reset speed when key goes up
        elif event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT:
                player.changespeed(3, 0)
            elif event.key == pygame.K_RIGHT:
                player.changespeed(-3, 0)
            elif event.key == pygame.K_UP:
                player.changespeed(0, 3)
            elif event.key == pygame.K_DOWN:
                player.changespeed(0, -3)

    # Clear the screen
    screen.fill(WHITE)

    # Get the current mouse position. This returns the position
    # as a list of two numbers.
    #pos = pygame.mouse.get_pos()

    # Fetch the x and y out of the list,
       # just like we'd fetch letters out of a string.
    # Set the player object to the mouse location
    #player.rect.x = pos[0]
    #player.rect.y = pos[1]

    # See if the player block has collided with anything.
    blocks_hit_list = pygame.sprite.spritecollide(player, block_list, True)

    # Check the list of collisions.
    for block in blocks_hit_list:
        score += 1
        print(score)

    # This calls update on all the sprites
    all_sprites_list.update()

    # Draw all the spites
    all_sprites_list.draw(screen)

    # Go ahead and update the screen with what we've drawn.
    pygame.display.flip()

    # Limit to 60 frames per second
    clock.tick(60)

pygame.quit()

Answer 1

问题在于：player = Block(BLUE, 20, 15)。 player是Block个实例而不是Player个实例，并且块没有changespeed方法。

实验室13 programarcadegames

1 个答案: