#define Windows

#include <stdio.h>
#include <string.h>
#ifdef Windows
  #include <windows.h>
    HANDLE hCon;
  void Ansi_ClearScreen() {
      hCon=GetStdHandle(STD_OUTPUT_HANDLE); system("cls");
        CONSOLE_CURSOR_INFO tCur = {.dwSize=8 , .bVisible = FALSE };
        SetConsoleCursorInfo( hCon , &tCur );
    }
  void Ansi_MoveHome()    { COORD tHome = { .X=1 , .Y=1 }; SetConsoleCursorPosition(hCon,tHome); }
#else
  void Ansi_ClearScreen() { printf("\x1b[2j"); }
  void Ansi_MoveHome()    { printf("\x1b[H"); }
#endif

int k;
double sin(),cos();
int main(){
  float A=0,B=0,i,j,z[1760];
    char buffer[1761]; buffer[1760]=0;

    Ansi_ClearScreen();

    for(;;) {

        memset(buffer,32,1760);
        memset(z,0,1760*sizeof(float));

    for( j=0 ; j<6.28 ; j+=0.07 ) {
            for( i=0 ; i<6.28 ; i+=0.02 ) {

                //calc pixel
                float c=sin(i) , d=cos(j) , e=sin(A) , f=sin(j) , g=cos(A);
                float h=d+2 , D=1/(c*h*e+f*g+5) , l=cos(i);
                float 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);
                int o=x+80*y , N=8*((f*e-c*d*g)*m-c*d*e-f*g-l*d*n);

                //plot pixel and Z order
                if ( ((unsigned)y)<22 && ((unsigned)x)<80 && D>z[o] ) {
                  z[o] = D ; buffer[o] = ".,-~:;=!*#$@"[ N>0 ? N : 0 ];
                }

            }
        }

        //rotate donut
        A+=.04 ; B+= 0.02;

        //display buffer
        Ansi_MoveHome();
        for( k=0;  k<1761 ; k+= 80 ) { buffer[k] = 10; }
        puts(buffer);

    }
}