python - Pygame Sprite "Colliding"在接触之前

Question

使用 python 和 pygame 编码和创建游戏的新手。游戏类似于《Flappy Bird》，但在太空中，管道是 meteor 。

正在努力在 Sprite 碰撞时创建一个事件，但 pygame.sprite.spritecollide 函数似乎无法正常工作。该函数在 Sprite 实际接触之前一英寸左右(在屏幕上)触发。如果玩家 Sprite 掉落穿过 meteor Sprite ，则不会触发该事件。

import pygame
import random

# Initialize the game engine 
pygame.init()

# Define colors
WHITE = (255, 255, 255)

# Define done 
done = False

def create_meteor():
    meteor = Meteor(WHITE, width, height)
    meteor_sprites_list.add(meteor)

class Player(pygame.sprite.Sprite):
    # This class will be the sprite controlled by player

    # -- Methods
    def __init__(self, filename, color, HW, HH):
        # Constructor function 
        # Call parent'c constructor 
        super().__init__()

        # Set height, width
        self.image = pygame.image.load("player.png").convert_alpha()
        # Set background color to transparent
        self.image.set_colorkey(color)

        # Make top-left corner the passed in locatin 
        self.rect = pygame.rect.Rect((HW, HH), self.image.get_size())

        # How much to add to current player position
        self.dy = 0 

    def ignite(self):
        self.dy = -400

    def update(self, dt, screen):

        #apply gravity
        self.dy = min(400, self.dy + 40)
        self.rect.y += self.dy * dt

        self.rect.topleft = (self.rect.x, self.rect.y)  

        # Blit image to screen
        screen.blit(self.image, (320, self.rect.y))
        pygame.display.flip()


# Define new clas for meteor
class Meteor(pygame.sprite.Sprite):
    def __init__(self, color, width, height):
        # Takes in parameters for color, width (x position) , and height (y postion)

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

        # Make list of image file location
        self.meteor_list = ["meteors/meteor1.png"]

        # Randomly select meteor from above list
        self.new_meteor = random.choice(self.meteor_list)

        # Load graphic that is in file folder  
        self.image = pygame.image.load(self.new_meteor).convert_alpha()

        # Set background to transparent
        self.image.set_colorkey(color)

        # Fetch the rectangle object that has the dimensions of the image
        self.rect = self.image.get_rect()

        # Random starting location
        self.rect.x = random.randrange(width, (width + 100))
        self.rect.y = random.randrange(0, height)

        # Random movement to the left
        self.change_x = random.randrange(-10,-5)
        self.change_y = random.randrange(-4,3)

    # ---- Attributes  
    # What meteor does each cycle through
    def update(self): 
        # Move bad block down 3 at a time 
        self.rect.x += self.change_x
        self.rect.y += self.change_y


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

background_size = pygame.image.load("background.png")
# Get dimensions of background
width = background_size.get_width()
height = background_size.get_height() 
HW, HH = width/2, height/2
size = (width, height)
screen = pygame.display.set_mode(size)


# Load image for star background  
background = pygame.image.load("background.png").convert_alpha()
# Seperate becuase error when placed before screen

# Creates a list of sprites. Each object in program is added to list. Managed by a class called "group"
meteor_sprites_list = pygame.sprite.Group()


# Create spaceship 
player = Player("player.png", WHITE, HW, HH)

# Create meteor sprites on the screen     
create_meteor()

#-----Main Program Loop 
while not done:
    dt = clock.tick(30)
    # Main event Loop 
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
        if event.type == pygame.MOUSEBUTTONDOWN:
            player.ignite()

#-----Game Logic 
    # Draw background
    screen.blit(background, (0,0))

    # Update Sprites 
    # Update meteor sprite
    meteor_sprites_list.update()
    # Update player sprite
    player.update(dt/1000. , screen)
    # Draw meteors
    meteor_sprites_list.draw(screen) 


    # Check to see if player has collided with meteor
    meteor_hit_list = pygame.sprite.spritecollide(player, meteor_sprites_list, True, pygame.sprite.collide_circle)

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

# Make sure to quit 
pygame.quit()

任何建议将不胜感激和欢迎。谢谢参观。

Answer 1

如果碰撞检测出现问题，通常有助于绘制(或打印)相关 Sprite 的矩形。您没有在矩形的 x 坐标处位 block 传输图像，因此矩形实际上会更靠右。

screen.blit(self.image, (320, self.rect.y))  # self.rect.x is equal to `HW` not 320.

只需将图像复制到矩形即可:

screen.blit(self.image, self.rect)