// 256 steps for 360 degrees
#define deg_90	 64
#define deg_180 128
#define deg_270 192


/* table of sine values from 0 to 90 degrees */
const unsigned sine_table[] = 
{
	0, 3, 6, 9,	12, 15, 18, 21,
	24, 27, 30, 33,	36, 39, 42, 45,
	48, 51, 54, 57,	59, 62, 65, 67,
	70, 73, 75, 78,	80, 82, 85, 87,
	89, 91, 94, 96,	98, 100, 102, 103,
	105, 107, 108, 110,	112, 113, 114, 116,
	117, 118, 119, 120,	121, 122, 123, 123,
	124, 125, 125, 126,	126, 126, 126, 126
};



int do_div(int n, unsigned d)
{
    int r = n / d;
    return(r);
}


/* temp values used becuase of compiler limitations */
/* returns the sine of an angle + 128 */
unsigned sine(unsigned a, unsigned scale)
{
	if (a <  64) // first quad
	{ 
		int s = do_div(sine_table[a], scale);
		return(128 + s);
	} else
    if (a < 128) // first quad (mirror x)
	{ 
		int s = do_div(sine_table[127 - a], scale);
		return(128 + s);
	} else
    if (a < 192) // third quad offset 180 degrees
	{ 
		int s = do_div(sine_table[a - 128], scale);
		return(128 - s);
	} else 		// forth quad mirror x
    { 
		int s = do_div(sine_table[255 - a], scale);
		return(128 - s);
	} 
}
/* enf of sin */