1 /***************************************************************************/
5 /* A routine used to compute vector angles with limited accuracy */
6 /* and very high speed (body). */
8 /* Copyright 2000-2001 Catharon Productions Inc. */
9 /* Author: David Turner */
11 /* This file is part of the Catharon Typography Project and shall only */
12 /* be used, modified, and distributed under the terms of the Catharon */
13 /* Open Source License that should come with this file under the name */
14 /* `CatharonLicense.txt'. By continuing to use, modify, or distribute */
15 /* this file you indicate that you have read the license and */
16 /* understand and accept it fully. */
18 /* Note that this license is compatible with the FreeType license. */
20 /***************************************************************************/
27 /* the following table has been automatically generated with */
28 /* the `mather.py' Python script */
30 const AH_Angle ah_arctan[1L << AH_ATAN_BITS] =
32 0, 0, 1, 1, 1, 2, 2, 2,
33 3, 3, 3, 3, 4, 4, 4, 5,
34 5, 5, 6, 6, 6, 7, 7, 7,
35 8, 8, 8, 9, 9, 9, 10, 10,
36 10, 10, 11, 11, 11, 12, 12, 12,
37 13, 13, 13, 14, 14, 14, 14, 15,
38 15, 15, 16, 16, 16, 17, 17, 17,
39 18, 18, 18, 18, 19, 19, 19, 20,
40 20, 20, 21, 21, 21, 21, 22, 22,
41 22, 23, 23, 23, 24, 24, 24, 24,
42 25, 25, 25, 26, 26, 26, 26, 27,
43 27, 27, 28, 28, 28, 28, 29, 29,
44 29, 30, 30, 30, 30, 31, 31, 31,
45 31, 32, 32, 32, 33, 33, 33, 33,
46 34, 34, 34, 34, 35, 35, 35, 35,
47 36, 36, 36, 36, 37, 37, 37, 38,
48 38, 38, 38, 39, 39, 39, 39, 40,
49 40, 40, 40, 41, 41, 41, 41, 42,
50 42, 42, 42, 42, 43, 43, 43, 43,
51 44, 44, 44, 44, 45, 45, 45, 45,
52 46, 46, 46, 46, 46, 47, 47, 47,
53 47, 48, 48, 48, 48, 48, 49, 49,
54 49, 49, 50, 50, 50, 50, 50, 51,
55 51, 51, 51, 51, 52, 52, 52, 52,
56 52, 53, 53, 53, 53, 53, 54, 54,
57 54, 54, 54, 55, 55, 55, 55, 55,
58 56, 56, 56, 56, 56, 57, 57, 57,
59 57, 57, 57, 58, 58, 58, 58, 58,
60 59, 59, 59, 59, 59, 59, 60, 60,
61 60, 60, 60, 61, 61, 61, 61, 61,
62 61, 62, 62, 62, 62, 62, 62, 63,
63 63, 63, 63, 63, 63, 64, 64, 64
68 ah_angle( FT_Vector* v )
77 /* check trivial cases */
112 if ( dx == 0 && dy == 0 )
118 angle += ah_arctan[FT_DivFix( dy, dx ) >> ( 16 - AH_ATAN_BITS )];
120 angle += AH_HALF_PI -
121 ah_arctan[FT_DivFix( dx, dy ) >> ( 16 - AH_ATAN_BITS )];