import pygame
import random
import sys

#### GLOBALNE VARIJABLE
WIDTH = 800
HEIGHT = 600

RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
size = (WIDTH, HEIGHT)


# inicijalizacija pygame sustava
pygame.init()

pygame.font.init()
#definiranje novog ekrana za igru
screen = pygame.display.set_mode(size)
#definiranje naziva prozora
pygame.display.set_caption("Nasa kul igra")

slika = pygame.image.load("slika.jpg")
slika = pygame.transform.scale(slika,(100,100))
clock = pygame.time.Clock()
bg = RED
x = WIDTH/2-50
y = HEIGHT/2-50
done = False
while not done:
    #event petlja
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_ESCAPE:
                done = True
            if event.key == pygame.K_SPACE:
                if bg == RED:
                    bg = BLUE
                elif bg == BLUE:
                    bg = RED
    screen.fill(bg)
    screen.blit(slika,(x, y))

    pygame.display.flip()
    dt = clock.tick(60)

pygame.quit()
sys.exit()