pygame画移动矩形

pygame画移动矩形

import pygame
from pygame.locals import *
pygame.init()
screen=pygame.display.set_mode((600,500))
pygame.display.set_caption("Drawing Rectangles")
pos_x=300
pos_y=250
vel_x=2
vel_y=1
while True:
    for event in pygame.event.get():
        if event.type in (QUIT,KEYDOWN):
            sys.exit()
    screen.fill((0,0,200))
    #move the rectangle
    pos_x =vel_x
    pos_y =vel_y
    #keep rectangle on the screen
    if pos_x>500 or pos_x<0:
        vel_x=-vel_x
    if pos_y>300 or pos_y<0:
        vel_y=-vel_y
    #draw the rectangle
    color=255,255,0
    width=0 #solid fill
    pos=pos_x,pos_y,100,100
    pygame.draw.rect(screen,color,pos,width)
    pygame.display.update()