canvas tag not supported
A B C D E

string math       proof
click = center and magnify by 10;
left = move left one fourth
right = move right one fourth
up = move up one fourth
down = move down one fourth
space = add level
minus- = remove level
//___________________________________________
function isin(x,y)
{
   var xo = x;
   var yo = y;
   for (var i = 0; i < max; i++)
   {
      var xx = Math.pow(Math.abs(x),D) * A - Math.pow(Math.abs(y),D) * B;
      var yy = 2 * x * y * C;
      x = xx + xo;
      y = yy + yo;
      if (x * x + y * y > E) return(i);
   }
   return(max);
}
//_____________________________________________