doughnut

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

int k;
double sin(double x);
double cos(double x);

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 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=sin(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;
    }
    return 0;
}