PyGame rysowanie tła w szachownicę

import pygame
# --- constants --- (UPPER_CASE_NAMES)
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
FPS = 25
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)
RED = (255, 0, 0)
BLUE = (0, 0, 255)
YELLOW = (255,255,0)
GRAY_1 = (128,128,128)
GRAY_2 = (192,192,192)
# --- main ---
pygame.init()
screen = pygame.display.set_mode( (SCREEN_WIDTH, SCREEN_HEIGHT) )
# ---
background = pygame.surface.Surface(screen.get_size())
color = GRAY_1
for x in range(0, SCREEN_WIDTH, 40):
for y in range(0, SCREEN_HEIGHT, 40):
pygame.draw.rect(background, color, [x, y, 40, 40])
if color == GRAY_1:
color = GRAY_2
else:
color = GRAY_1
# ---
surface = pygame.surface.Surface(screen.get_size())
surface.set_colorkey([0,0,0])
pygame.draw.polygon(surface, RED, [(300,100), (400,300), (500,100)])
pygame.draw.polygon(surface, RED, [(300,100), (400,300), (500,100)])
pygame.draw.polygon(surface, GREEN, [(300,300), (400,300), (500,300)])
pygame.draw.polygon(surface, BLUE, [(300,100), (400,300), (300,300)])
pygame.draw.polygon(surface, YELLOW, [(500,100), (400,300), (500,300)])
lower = True
alpha = 255
# --- mainloop ---
clock = pygame.time.Clock()
running = True
while running:
# --- events ---
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.KEYUP:
if event.key == pygame.K_ESCAPE:
running = False
# --- changes ---
if lower:
alpha -= 10
if alpha <= 10:
lower = False
else:
alpha += 10
if alpha >= 250:
lower = True
surface.set_alpha(alpha)
# --- draws ---
screen.blit(background, (0,0))
screen.blit(surface, (0,0))
pygame.display.flip()
# --- FPS ---
ms = clock.tick(FPS)
#pygame.display.set_caption('{}ms'.format(ms)) # 40ms for 25FPS, 16ms for 60FPS
fps = clock.get_fps()
pygame.display.set_caption('FPS: {}'.format(fps))
# --- end ---
pygame.quit()
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