#moving rectangle project

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):

      pygame.quit()

  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 > 400 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()