1 #ifndef __LUT
2 #define __LUT 1
3 
4 #define TRIG_UNIT                   511
5 #define ANGLE_UNIT                  256
6 /* The same idea as 2*PI, PI/2, PI/4, etc. */
7 #define ANGLE_UNIT_2                (ANGLE_UNIT*2)
8 #define ANGLE_UNIT_HALF             (ANGLE_UNIT/2)
9 #define ANGLE_UNIT_EIGHTH           (ANGLE_UNIT/8)
10 #define ANGLE_UNIT_QUART            (ANGLE_UNIT/4)
11 #define ANGLE_UNIT_THREE_QUARTERS   (ANGLE_UNIT*3/4)
12 
13 
14 long lut_sin (long a);
15 /* long lut_cos (long a);  As a macro */
16 #define lut_cos(angle) (lut_sin((angle)+ANGLE_UNIT_QUART))
17 long lut_angle (long dx, long dy);
18 long lut_dist (long x, long y);
19 #endif
20 
21 /* You see, 360 degree, 2*PI radians are more or less arbitrary angle units.
22  * Since I have created my own trig functions I can create my own
23  * angle units. I created ones that powers of 2.
24  */
25 
26 
27