├── README.md
└── donut.py


/README.md:
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1 | # Donut
2 | 3D ASCII donut using Python with Pygame
3 | 
4 | This code is inspired by Andy Sloane blog post where he explained how he wrote C code for rotating ASCII donut. 
5 | https://www.a1k0n.net/2011/07/20/donut-math.html
6 | 
7 | Faster and improved version:
8 | https://github.com/codegiovanni/Donut_2.0
9 | 


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/donut.py:
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  1 | import pygame
  2 | import math
  3 | import colorsys
  4 | 
  5 | pygame.init()
  6 | 
  7 | white = (255, 255, 255)
  8 | black = (0, 0, 0)
  9 | hue = 0
 10 | 
 11 | WIDTH = 1920
 12 | HEIGHT = 1080
 13 | 
 14 | x_start, y_start = 0, 0
 15 | 
 16 | x_separator = 10
 17 | y_separator = 20
 18 | 
 19 | rows = HEIGHT // y_separator
 20 | columns = WIDTH // x_separator
 21 | screen_size = rows * columns
 22 | 
 23 | x_offset = columns / 2
 24 | y_offset = rows / 2
 25 | 
 26 | A, B = 0, 0  # rotating animation
 27 | 
 28 | theta_spacing = 10
 29 | phi_spacing = 1 # for faster rotation change to 2, 3 or more, but first change 86, 87 lines as commented
 30 | 
 31 | chars = ".,-~:;=!*#$@"  # luminance index
 32 | 
 33 | screen = pygame.display.set_mode((WIDTH, HEIGHT))
 34 | 
 35 | display_surface = pygame.display.set_mode((WIDTH, HEIGHT))
 36 | # display_surface = pygame.display.set_mode((0, 0), pygame.FULLSCREEN)
 37 | pygame.display.set_caption('Donut')
 38 | font = pygame.font.SysFont('Arial', 18, bold=True)
 39 | 
 40 | def hsv2rgb(h, s, v):
 41 |     return tuple(round(i * 255) for i in colorsys.hsv_to_rgb(h, s, v))
 42 | 
 43 | 
 44 | def text_display(letter, x_start, y_start):
 45 |     text = font.render(str(letter), True, hsv2rgb(hue, 1, 1))
 46 |     display_surface.blit(text, (x_start, y_start))
 47 | 
 48 | # def text_display(letter, x_start, y_start):
 49 | #     text = font.render(str(letter), True, white)
 50 | #     display_surface.blit(text, (x_start, y_start))
 51 | 
 52 | 
 53 | run = True
 54 | while run:
 55 | 
 56 |     screen.fill((black))
 57 | 
 58 |     z = [0] * screen_size  # Donut. Fills donut space
 59 |     b = [' '] * screen_size  # Background. Fills empty space
 60 | 
 61 |     for j in range(0, 628, theta_spacing):  # from 0 to 2pi
 62 |         for i in range(0, 628, phi_spacing):  # from 0 to 2pi
 63 |             c = math.sin(i)
 64 |             d = math.cos(j)
 65 |             e = math.sin(A)
 66 |             f = math.sin(j)
 67 |             g = math.cos(A)
 68 |             h = d + 2
 69 |             D = 1 / (c * h * e + f * g + 5)
 70 |             l = math.cos(i)
 71 |             m = math.cos(B)
 72 |             n = math.sin(B)
 73 |             t = c * h * g - f * e
 74 |             x = int(x_offset + 40 * D * (l * h * m - t * n))  # 3D x coordinate after rotation
 75 |             y = int(y_offset + 20 * D * (l * h * n + t * m))  # 3D y coordinate after rotation
 76 |             o = int(x + columns * y)  
 77 |             N = int(8 * ((f * e - c * d * g) * m - c * d * e - f * g - l * d * n))  # luminance index
 78 |             if rows > y and y > 0 and x > 0 and columns > x and D > z[o]:
 79 |                 z[o] = D
 80 |                 b[o] = chars[N if N > 0 else 0]
 81 | 
 82 |     if y_start == rows * y_separator - y_separator:
 83 |         y_start = 0
 84 | 
 85 |     for i in range(len(b)):
 86 |         A += 0.00004  # for faster rotation change to bigger value
 87 |         B += 0.00002  # for faster rotation change to bigger value
 88 |         if i == 0 or i % columns:
 89 |             text_display(b[i], x_start, y_start)
 90 |             x_start += x_separator
 91 |         else:
 92 |             y_start += y_separator
 93 |             x_start = 0
 94 |             text_display(b[i], x_start, y_start)
 95 |             x_start += x_separator
 96 | 
 97 | 
 98 |     pygame.display.update()
 99 | 
100 |     hue += 0.005
101 | 
102 |     for event in pygame.event.get():
103 |         if event.type == pygame.QUIT:
104 |             run = False
105 |         if event.type == pygame.KEYDOWN:
106 |             if event.key == pygame.K_ESCAPE:
107 |                 run = False
108 | 
109 | 


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