pygame.draw.rect（）没有使另一个矩形消失

Question

I am making a simple graphical game in pygame. I wanted to draw 2 rectangles but it only draws one not the other.

I made a class of drawing different figures. To fix that issue I removed the class and made a plain function. Id didn't work too. Then I just put the code of function statements in the program.

The final code I get is this

import pygame

black = (0,0,0)
yellow = (200,200,0)

def drawShopButton():
    pygame.draw.rect(gameDisplay, black, (690,435,110,65))
    pygame.display.update()
    pygame.draw.rect(gameDisplay, yellow, (0,500,110,65))
    pygame.display.update()

pygame.init()
gameDisplay = pygame.display.set_mode((800, 500))
gameDisplay.fill((40, 120, 0))
pygame.display.update()
pygame.draw.rect(gameDisplay, black, (690,435,110,65))
pygame.display.update()
clock = pygame.time.Clock()
clock.tick(40)

pygame.draw.rect(gameDisplay, yellow, (0,500,110,65))
pygame.display.update()
mouse = pygame.mouse.get_pos()
click = pygame.mouse.get_pressed()
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()

    pygame.display.update()

Answer 1

The left top corner of the game board is (0,0) and the bottom right corner is (800,500). So, pygame.draw.rect(gameDisplay, yellow, (0,500,110,65)) is trying to draw a rectangle that is starting at the right top of the board and is (110, 65) wide and tall. Your code is drawing two rectangles alright, but beyond the visibility scope.