debug-spritesheet.py

import pygame

def debug_spritesheet(path, cell_w=32, cell_h=32):
    pygame.init()
    sheet = pygame.image.load(path).convert_alpha()
    screen = pygame.display.set_mode(sheet.get_size())
    clock = pygame.time.Clock()

    running = True
    while running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False

        screen.fill((0, 0, 0))
        screen.blit(sheet, (0, 0))

        # draw grid
        w, h = sheet.get_size()
        for x in range(0, w, cell_w):
            pygame.draw.line(screen, (255, 0, 0), (x, 0), (x, h))
        for y in range(0, h, cell_h):
            pygame.draw.line(screen, (0, 255, 0), (0, y), (w, y))

        pygame.display.flip()
        clock.tick(30)

    pygame.quit()

debug_spritesheet("spritesheet.png", cell_w=64, cell_h=64)