Question

我正在研究如何利用pygame的图形资料，并在制作雪花发生器时遇到问题。它的作用是随机选择屏幕的一部分并在其中放置一个白色圆圈，并将该圆圈的坐标添加到列表中以重绘下一帧。雪花都以恒定的速度向下移动，一旦它们到达底部，我想在屏幕上方略微重绘它们。当我尝试这样做时，我收到此错误：

File "C:\Users\User\Pokemon game\Pokemon-game\snowflakes stuff.py", line 33, in <module>
    y_coord=randint(-10, -50)
  File "C:\Python36-32\lib\random.py", line 221, in randint
    return self.randrange(a, b+1)
  File "C:\Python36-32\lib\random.py", line 199, in randrange
    raise ValueError("empty range for randrange() (%d,%d, %d)" % (istart, istop, width))
ValueError: empty range for randrange() (-10,-49, -39)
[Finished in 1.7s with exit code 1]

这是我的代码：

import pygame
from random import *

pygame.init()

Black=(0, 0, 0)
White=(255, 255, 255)

size=(800, 600)
game_display=pygame.display.set_mode(size)
pygame.display.set_caption('Snowflakes')

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

pygame.mouse.set_visible(False)

snow=[]

while not closed:
    for event in pygame.event.get():
        if event.type==pygame.QUIT:
            close=True
    game_display.fill(Black)
    x_coord=randint(0, 800)
    y_coord=randint(0, 600)
    snow.append([x_coord, y_coord])
    for i in range(len(snow)):
        pygame.draw.circle(game_display, White, snow[i], 2)
        snow[i][1]+=1
        if snow[i][1]>600:
            x_coord=randint(0, 800)
            y_coord=randint(-10, -50)
            snow[i][0]=x_coord
            snow[i][1]=y_coord
    pygame.display.flip()
    clock.tick(60)
pygame.quit()
quit()

Pygame无法在屏幕上方绘制

0 个答案: