lens

import pygame
pygame.init()

clock = pygame.time.Clock()

screen = pygame.display.set_mode((800,600))
pygame.display.set_caption("LENSES")

font_16 = pygame.font.Font('freesansbold.ttf', 16)
font_23 = pygame.font.Font('freesansbold.ttf', 23)

move = 5
x1 = 10
x2 = 110
y1 = 200
y2 = 250
y3 = 350
y4 = 400
y11 = 200
y22 = 250
y33 = 350
y44 = 400
o = False
f = False

running = True
while running:
    screen.fill((50,50,50))

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


    pygame.draw.ellipse(screen, (176,208,218), (385, 150, 30, 300))
    pygame.draw.line(screen, (255,0,0), (0,300), (800,300))

    pygame.draw.line(screen, (255,0,0), (400,290), (400,310))
    screen.blit(font_16.render("O", True, (255,0,0)), (395,315))

    pygame.draw.line(screen, (255,0,0), (200, 290), (200,310))
    screen.blit(font_16.render("C", True, (255,0,0)), (195,315))
    pygame.draw.line(screen, (255,0,0), (300, 290), (300,310))
    screen.blit(font_16.render("F", True, (255,0,0)), (295,315))

    pygame.draw.line(screen, (255,0,0), (600, 290), (600,310))
    screen.blit(font_16.render("C", True, (255,0,0)), (595,315))
    pygame.draw.line(screen, (255,0,0), (500, 290), (500,310))
    screen.blit(font_16.render("F", True, (255,0,0)), (495,315))

    pygame.draw.line(screen, (255,255,255), (5,190), (5,410), 4)


    if not(o):
        x1 += move
        x2 += move

        if x2 == 400:
            o = True

    if o and not(f):
        move = 2
        x1 += move
        x2 += move
        y11 += 2
        y22 += 1
        y33 += -1
        y44 += -2

        if x2 == 500:
            f = True

    if f:
        move = 2
        x1 += move
        x2 += move

        y1 += 2
        y2 += 1
        y3 += -1
        y4 += -2

        y11 += 2
        y22 += 1
        y33 += -1
        y44 += -2

        if x2 > 605:
            move = 5
            x1 = 10
            x2 = 110
            y1 = 200
            y2 = 250
            y3 = 350
            y4 = 400
            y11 = 200
            y22 = 250
            y33 = 350
            y44 = 400
            o = False
            f = False


    pygame.draw.line(screen, (255,255,255), (x1,y1), (x2,y11), 2)
    pygame.draw.line(screen, (255,255,255), (x1,y2), (x2,y22), 2)
    pygame.draw.line(screen, (255,255,255), (x1,300), (x2,300), 2)
    pygame.draw.line(screen, (255,255,255), (x1,y3), (x2,y33), 2)
    pygame.draw.line(screen, (255,255,255), (x1,y4), (x2,y44), 2)

    msg1 = "When an object is placed at infinity, the real image is formed at the"
    msg2 = "focus. The size of the image is point sized (highly diminished)."
    screen.blit(font_23.render(msg1, True, (255,255,255)), (5,10))
    screen.blit(font_23.render(msg2, True, (255,255,255)), (5,35))

    clock.tick(10)
    pygame.display.update()