donut

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

int k;

int main()
{
  float A = 0, B = 0, i, j, z[1760];
  char b[1760];
  printf("\n1b2[J");
  for(;;) {
    memset(b, 32, 1760);
    memset(z, 0, 7040);
    for(j = 0; 6.28 > j; j += 0.004) {
      for(i = 0; 6.28 > i; i+= 0.035) {
      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);
      int 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 && 80 > x && x > 0 && 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;
}