[Astronouth7303]

My current code is like this:

#define abs(Num) ( ((Num) < 0) ? (0 - (Num)) : (Num) )
#define IsNegetive(Num) ( ((Num) < 0) ? 255 : 0 )
#define IsPositive(Num) ( ((Num) > 0) ? 255 : 0 )



/* 360 degrees = 256
  0 =   0 (0x00)
 45 =  32 (0x20)
 90 =  64 (0x40)
135 =  96 (0x60)
180 = 128 (0x80)
225 = 160 (0xA0)
270 = 192 (0xC0)
315 = 224 (0xE0) */

unsigned char GetAngle(signed char X, signed char Y)
{
   signed int  Angle = 0;
 unsigned char OtherSide = (X < 0) ? 255 : 0;
 unsigned char Value = 0;
 unsigned char Simple = (X == 0) | (Y == 0) | (X == Y);
 
 //Perform Simple tests
 if (Simple)
 {
  if (X == 0)
   if (Y < 0)
    Angle = 192; // Down
   else if (Y > 0)
    Angle = 64; //Up
   else // Y == 0
    Angle = 0; //None, default
  
  if (Y == 0)
   if (X < 0)
    Angle = 128; // Left
   else if (X > 0)
    Angle = 0; //Right
   else // X == 0
    Angle = 0; //None, default
  
  if (X == Y)
  {
   switch( (IsNegetive(X) & 2) | (IsNegetive(Y) & 1) )
   {
    case 0: //++
     Angle = 32;
     break;
    case 2: //-+
     Angle = 96;
     break;
    case 3: //--
     Angle = 160;
     break;
    case 1: //+-
     Angle = 224;
     break;
   }
  }
 }

 //Again for goto, no braces
 if (Simple) goto Done; //I hope that's right
 
 if (X > Y) //Preserve accuracy
  Angle = 64 - atan(abs(X)/Y);
 else
  Angle = atan(abs(X)/Y);
 
 Angle = OtherSide ? (127 - Angle) : Angle;
 Value = (unsigned char)((Angle + 255) % 255);
 
Done:
 return Value;
}

Nobody's answered the last question!