https://github.com/petercunha/donut
:robot: A JavaScript implementation of the infamous "donut.c" program
https://github.com/petercunha/donut
code-golf delicious donuts javascript pointless
Last synced: about 1 month ago
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:robot: A JavaScript implementation of the infamous "donut.c" program
- Host: GitHub
- URL: https://github.com/petercunha/donut
- Owner: petercunha
- License: mit
- Created: 2018-09-06T03:48:09.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2023-11-09T19:52:52.000Z (over 1 year ago)
- Last Synced: 2025-04-04T07:10:02.914Z (about 2 months ago)
- Topics: code-golf, delicious, donuts, javascript, pointless
- Language: JavaScript
- Homepage: https://donut.surge.sh
- Size: 9.77 KB
- Stars: 39
- Watchers: 2
- Forks: 12
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Donut
A javascript implementation of the famous "donut.c"
[**Click here to see The Donut in action**](https://donut.surge.sh/)
[](https://donut.surge.sh/)
## The Original Code
Here is the code for the original "donut.c" program.
```C
#include
k;double sin()
,cos();main(){float A=
0,B=0,i,j,z[1760];char b[
1760];printf("\x1b[2J");for(;;
){memset(b,32,1760);memset(z,0,7040)
;for(j=0;6.28>j;j+=0.07)for(i=0;6.28
>i;i+=0.02){float c=sin(i),d=cos(j),e=
sin(A),f=sin(j),g=cos(A),h=d+2,D=1/(c*
h*e+f*g+5),l=cos (i),m=cos(B),n=s\
in(B),t=c*h*g-f* e;int x=40+30*D*
(l*h*m-t*n),y= 12+15*D*(l*h*n
+t*m),o=x+80*y, N=8*((f*e-c*d*g
)*m-c*d*e-f*g-l *d*n);if(22>y&&
y>0&&x>0&&80>x&&D>z[o]){z[o]=D;;;b[o]=
".,-~:;=!*#$@"[N>0?N:0];}}/*#****!!-*/
printf("\x1b[H");for(k=0;1761>k;k++)
putchar(k%80?b[k]:10);A+=0.04;B+=
0.02;}}/*****####*******!!=;:~
~::==!!!**********!!!==::-
.,~~;;;========;;;:~-.
..,--------,*/
```
## How the hell...?
That's a good question. It's mostly trigonometry witchcraft and some Z-Buffering. For a deeper explanation of how it works, [read this article](https://www.a1k0n.net/2011/07/20/donut-math.html) by A1K0N.