Function rotate_donut_3D

CPP/pattern/donut.cpp:33–56

#include <stdio.h>
 
void rotate_donut_3D(void)
{   // Originally Code by Andy Sloane https://www.a1k0n.net/2011/07/20/donut-math.html
            int k; //by Andy Sloane
        system("cls"); //C++ Builder
     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;}/*****####*******!!=;:~
        ~::==!!!**********!!!==::-
          .,~~;;;========;;;:~-.
              ..,--------,*/
}
 
int _tmain(int argc, _TCHAR* argv[])
{