donut.c

int 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 sini=sin(i),
                      cosj=cos(j),
                      sinA=sin(A),
                      sinj=sin(j),
                      cosA=cos(A),
                      cosj2=cosj+2,
                      mess=1/(sini*cosj2*sinA+sinj*cosA+5),
                      cosi=cos(i),
                      cosB=cos(B),
                      sinB=sin(B),
                      t=sini*cosj2*cosA-sinj* sinA;
                int x=40+30*mess*(cosi*cosj2*cosB-t*sinB),
                    y= 12+15*mess*(cosi*cosj2*sinB +t*cosB),
                    o=x+80*y,
                    N=8*((sinj*sinA-sini*cosj*cosA)*cosB-sini*cosj*sinA-sinj*cosA-cosi *cosj*sinB);
                if(22>y&&y>0&&x>0&&80>x&&mess>z[o]){
                    z[o]=mess;
                    b[o]=".,-~:;=!*#$@"[N>0?N:0];
                }
            }
        }
        printf("\x1b[d");
        for(k=0; 1761>k; k++)
            putchar(k%80?b[k]:10);
        A+=0.04;
        B+= 0.02;
    }
}

How can i change the FOV and the distance to the viewer of the donut?
and somehow usleep nor changing the A B in 36,37 slow the spin for me, but decreasing i+= and j+= in 14,15 did it for me.

How can written [N > 0 ? N : 0]; with python

[N if N > 0 else 0]
or
[0, N][N > 0]

For anyone interested:

Link to original blog post, by Andy Sloane

Implementation without floating-point

JQ port

thank you so much it did finaly work

How can I make it spin slower

./donut : The term './donut' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:2 char:1

• ./donut

•   + CategoryInfo          : ObjectNotFound: (./donut:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException
  

what happen with dis?

@youcantseeken it seems you haven't compiled "donut.c", or the compiled .exe isn't located in the same working-directory as the terminal

**
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <unistd.h>

int main() {
float A = 0, B = 0;
float i, j;
int k;
float z[1760];
char b[1760];
printf("\x1b[2J");
for (;;) {
memset(b, 32, 1760);
memset(z, 0, 7040);
for (j = 0; j < 6.28; j += 0.07) {
for (i = 0; i < 6.28; i += 0.02) {
float c = sin(i);
float d = cos(j);
float e = sin(A);
float f = sin(j);
float g = cos(A);
float h = d + 2;
float D = 1 / (c * h * e + f * g + 5);
float l = cos(i);
float m = cos(B);
float n = sin(B);
float t = c * h * g - f * e;
int x = 40 + 30 * D * (l * h * m - t * n);
int y = 12 + 15 * D * (l * h * n + t * m);
int o = x + 80 * y;
int 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; k < 1761; k++) {
putchar(k % 80 ? b[k] : 10);
A += 0.00004;
B += 0.00002;
}
usleep(30000);
}
return 0;
}

**

My code runs, but thereseems to be a flickering issue.

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <unistd.h>

int k;
double sin(), cos();
int 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 sini = sin(i),
cosj = cos(j),
sinA = sin(A),
sinj = sin(j),
cosA = cos(A),
cosj2 = cosj + 2,
mess = 1 / (sini * cosj2 * sinA + sinj * cosA + 5),
cosi = cos(i),
cosB = cos(B),
sinB = sin(B),
t = sini * cosj2 * cosA - sinj * sinA;
int x = 40 + 30 * mess * (cosi * cosj2 * cosB - t * sinB),
y = 12 + 15 * mess * (cosi * cosj2 * sinB + t * cosB),
o = x + 80 * y,
N = 8 * ((sinj * sinA - sini * cosj * cosA) * cosB - sini * cosj * sinA - sinj * cosA - cosi * cosj * sinB);
if (22 > y && y > 0 && x > 0 && 80 > x && mess > z[o])
{
z[o] = mess;
b[o] = ".,-~:;=!*#$@"[N > 0 ? N : 0];
}
}
}
system("cls");
for (k = 0; 1761 > k; k++)
putchar(k % 80 ? b[k] : 10);
A += 0.08;
B += 0.03;
}
}

()
https://gist.github.com/brunocrt/99fd2bc5553fc69b22ce3101ab03b8d4

in windows this donut spins way too slow

use clang compiler it's a little better than gcc or zig cc.