import pygame, sys

pygame.init()

windowSurface = pygame.display.set_mode((500, 400))
pygame.display.set_caption('Hello world!')

BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)

color_text = WHITE
color_background = WHITE
color_polygon = GREEN
color_border = RED

running = True
while running:

    basic_font = pygame.font.SysFont(None, 48)
    text = basic_font.render('Hello world!', True, color_text ,BLUE)
    text_rect = text.get_rect()
    text_rect.centerx = windowSurface.get_rect().centerx
    text_rect.centery = windowSurface.get_rect().centery

    windowSurface.fill(color_background)

    pygame.draw.polygon(windowSurface, color_polygon, 
            ((146, 0), (291, 106), (236, 277), (56, 277), (0, 106))
            )

    pygame.draw.line(windowSurface, BLUE, (60, 60), (120, 60), 4)
    pygame.draw.line(windowSurface, BLUE, (120, 60), (60, 120))
    pygame.draw.line(windowSurface, BLUE, (60, 120), (120, 120), 4)

    pygame.draw.circle(windowSurface, BLUE, (300, 50), 20, 0)

    pygame.draw.ellipse(windowSurface, RED, (300, 250, 40,80), 1)

    pygame.draw.rect(windowSurface, color_border, 
            (text_rect.left - 20, text_rect.top - 20, 
                text_rect.width + 40, text_rect.height + 40)
            )

    windowSurface.blit(text, text_rect)

    pygame.display.update()

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.MOUSEBUTTONUP:
            color_background = WHITE
            color_border = (255, (color_border[1] + 10) % 256, 0)
        elif event.type == pygame.MOUSEBUTTONDOWN:
            color_background = RED
        elif event.type == pygame.KEYUP:
            if event.key == pygame.K_UP:
                color_polygon = BLACK
            elif event.key == pygame.K_DOWN:
                color_polygon = GREEN

pygame.quit()