Pygame 精灵消失

Question

在我之前的中，我遇到了精灵问题。所以我决定在绘制它们之前使用清除方法。它似乎奏效了，但是当精灵到达屏幕底部时，也就是它们应该回到顶部的时候，它们消失了。 9个只剩下2个

在他们到达底部之前。

到达底部后重新回到顶部

主文件

#!/usr/bin/python
VERSION = "0.1"
import os, sys, raindrop
from os import path

try:
    import pygame
    from pygame.locals import *
except ImportError, err:
    print 'Could not load module %s' % (err)
    sys.exit(2)

# main variables
WIDTH, HEIGHT, FPS = 300, 300, 30


# initialize game
pygame.init()
screen = pygame.display.set_mode((WIDTH,HEIGHT))
pygame.display.set_caption("Rain and Rain")

# background
background = pygame.Surface(screen.get_size())
background = background.convert()
background.fill((40,44,52))

# blitting
screen.blit(background,(0,0))
pygame.display.flip()

# clock for FPS settings
clock = pygame.time.Clock()


def main():
    raindrops = pygame.sprite.Group()

    # a function to create new drops
    def newDrop():
        nd = raindrop.Raindrop()
        raindrops.add(nd)

    # creating 10 rain drops
    for x in range(0,9): newDrop()

    # variable for main loop
    running = True

    # event loop
    while running:
        clock.tick(FPS)
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False


        screen.blit(background,(100,100))
        raindrops.clear(screen,background)
        raindrops.update()
        raindrops.draw(screen)
        pygame.display.flip()
    pygame.quit()

if __name__ == '__main__': main()

raindrop.py ( class )

import pygame
from pygame.locals import *
from os import path
from random import randint
from rain import HEIGHT

img_dir = path.join(path.dirname(__file__), 'img')

class Raindrop(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        self.width = randint(32, 64)
        self.height = self.width + 33
        self.image = pygame.image.load(path.join(img_dir, "raindrop.png")).convert_alpha()
        self.image = pygame.transform.scale(self.image, (self.width, self.height))
        self.speedy = 5 #randint(1, 8)
        self.rect = self.image.get_rect()
        self.rect.x = randint(0, 290)
        self.rect.y = -self.height

    def update(self):
        self.rect.y += self.speedy
        if self.rect.y == HEIGHT:
            self.rect.y = -self.height
            self.rect.x = randint(0, 290)

Answer 1

if self.rect.y == HEIGHT:

问题是有些雨滴会超过 HEIGHT，因为 speedy 是范围 [1,8] 中的随机数，所以 speedy 的倍数可能无法被整除2*HEIGHT。例如 speedy = 7、rect.y 从 -HEIGHT = -300 变为 -293、-286、...、295，然后变为大于 300 的 302，因此 == 检查永远不会是真的，雨滴永远落下。

对 >= 的简单更改将解决问题：

if self.rect.y >= HEIGHT:

Pygame 精灵消失

Pygame Sprites Dissapearing

python

pygame

sprite

python-2.7

主文件

raindrop.py ( class )