| 2 |
- |
1 |
/* Copyright (C) 1989, 1995, 1998, 1999 Aladdin Enterprises. All rights reserved.
|
|
|
2 |
|
|
|
3 |
This software is provided AS-IS with no warranty, either express or
|
|
|
4 |
implied.
|
|
|
5 |
|
|
|
6 |
This software is distributed under license and may not be copied,
|
|
|
7 |
modified or distributed except as expressly authorized under the terms
|
|
|
8 |
of the license contained in the file LICENSE in this distribution.
|
|
|
9 |
|
|
|
10 |
For more information about licensing, please refer to
|
|
|
11 |
http://www.ghostscript.com/licensing/. For information on
|
|
|
12 |
commercial licensing, go to http://www.artifex.com/licensing/ or
|
|
|
13 |
contact Artifex Software, Inc., 101 Lucas Valley Road #110,
|
|
|
14 |
San Rafael, CA 94903, U.S.A., +1(415)492-9861.
|
|
|
15 |
*/
|
|
|
16 |
|
|
|
17 |
/* $Id: math_.h,v 1.7 2004/04/08 16:18:25 giles Exp $ */
|
|
|
18 |
/* Generic substitute for math.h */
|
|
|
19 |
|
|
|
20 |
#ifndef math__INCLUDED
|
|
|
21 |
# define math__INCLUDED
|
|
|
22 |
|
|
|
23 |
/* We must include std.h before any file that includes sys/types.h. */
|
|
|
24 |
#include "std.h"
|
|
|
25 |
|
|
|
26 |
#if defined(VMS) && defined(__GNUC__)
|
|
|
27 |
/* DEC VAX/VMS C comes with a math.h file, but GNU VAX/VMS C does not. */
|
|
|
28 |
# include "vmsmath.h"
|
|
|
29 |
#else
|
|
|
30 |
# include <math.h>
|
|
|
31 |
#endif
|
|
|
32 |
|
|
|
33 |
/* math.h is different for Turbo and Unix.... */
|
|
|
34 |
#ifndef M_PI
|
|
|
35 |
# ifdef PI
|
|
|
36 |
# define M_PI PI
|
|
|
37 |
# else
|
|
|
38 |
# define M_PI 3.14159265358979324
|
|
|
39 |
# endif
|
|
|
40 |
#endif
|
|
|
41 |
|
|
|
42 |
/* Factors for converting between degrees and radians */
|
|
|
43 |
#define degrees_to_radians (M_PI / 180.0)
|
|
|
44 |
#define radians_to_degrees (180.0 / M_PI)
|
|
|
45 |
|
|
|
46 |
/*
|
|
|
47 |
* Define the maximum value of a single-precision float.
|
|
|
48 |
* This doesn't seem to be defined in any standard place,
|
|
|
49 |
* and we need an exact value for it.
|
|
|
50 |
*/
|
|
|
51 |
#undef MAX_FLOAT /* just in case */
|
|
|
52 |
#if defined(vax) || defined(VAX) || defined(__vax) || defined(__VAX)
|
|
|
53 |
/* Maximum exponent is +127, 23 bits of fraction. */
|
|
|
54 |
# define MAX_FLOAT\
|
|
|
55 |
((0x800000 - 1.0) * 0x1000000 * 0x1000000 * 0x10000000 * 0x10000000)
|
|
|
56 |
#else
|
|
|
57 |
/* IEEE, maximum exponent is +127, 23 bits of fraction + an implied '1'. */
|
|
|
58 |
# define MAX_FLOAT\
|
|
|
59 |
((0x1000000 - 1.0) * 0x1000000 * 0x1000000 * 0x10000000 * 0x10000000)
|
|
|
60 |
#endif
|
|
|
61 |
|
|
|
62 |
/* Define the hypot procedure on those few systems that don't provide it. */
|
|
|
63 |
#if defined(_IBMR2)
|
|
|
64 |
/* The RS/6000 has hypot, but math.h doesn't declare it! */
|
|
|
65 |
extern double hypot(double, double);
|
|
|
66 |
#elif defined(_MSC_VER)
|
|
|
67 |
# define hypot(x,y) _hypot(x,y)
|
|
|
68 |
#elif !defined(__TURBOC__) && !defined(BSD4_2) && !defined(VMS) && !defined(__MWERKS__) && !defined(HAVE_HYPOT)
|
|
|
69 |
# define hypot(x,y) sqrt((double)(x)*(x)+(double)(y)*(y))
|
|
|
70 |
#endif
|
|
|
71 |
|
|
|
72 |
#ifdef OSK
|
|
|
73 |
/* OSK has atan2 and ldexp, but math.h doesn't declare them! */
|
|
|
74 |
extern double atan2(), ldexp();
|
|
|
75 |
#endif
|
|
|
76 |
|
|
|
77 |
/* Intercept calls on sqrt for debugging. */
|
|
|
78 |
extern double gs_sqrt(double, const char *, int);
|
|
|
79 |
#ifdef DEBUG
|
|
|
80 |
#undef sqrt
|
|
|
81 |
#define sqrt(x) gs_sqrt(x, __FILE__, __LINE__)
|
|
|
82 |
#endif /* DEBUG */
|
|
|
83 |
|
|
|
84 |
#endif /* math__INCLUDED */
|