include/wx/math.h

   1 /**
   2 * Name:        wx/math.h
   3 * Purpose:     Declarations/definitions of common math functions
   4 * Author:      John Labenski and others
   5 * Modified by:
   6 * Created:     02/02/03
   7 * RCS-ID:      $Id$
   8 * Copyright:   (c) John Labenski
   9 * Licence:     wxWindows licence
  10 */
  11
  12 /* THIS IS A C FILE, DON'T USE C++ FEATURES (IN PARTICULAR COMMENTS) IN IT */
  13
  14 #ifndef _WX_MATH_H_
  15 #define _WX_MATH_H_
  16
  17 #include "wx/defs.h"
  18
  19 #include <math.h>
  20
  21 #ifndef M_PI
  22     #define M_PI 3.1415926535897932384626433832795
  23 #endif
  24
  25 /* Scaling factors for various unit conversions */
  26 #ifndef METRIC_CONVERSION_CONSTANT
  27     #define METRIC_CONVERSION_CONSTANT 0.0393700787
  28 #endif
  29
  30 #ifndef mm2inches
  31     #define mm2inches (METRIC_CONVERSION_CONSTANT)
  32 #endif
  33
  34 #ifndef inches2mm
  35     #define inches2mm (1/(mm2inches))
  36 #endif
  37
  38 #ifndef mm2twips
  39     #define mm2twips (METRIC_CONVERSION_CONSTANT*1440)
  40 #endif
  41
  42 #ifndef twips2mm
  43     #define twips2mm (1/(mm2twips))
  44 #endif
  45
  46 #ifndef mm2pt
  47     #define mm2pt (METRIC_CONVERSION_CONSTANT*72)
  48 #endif
  49
  50 #ifndef pt2mm
  51     #define pt2mm (1/(mm2pt))
  52 #endif
  53
  54
  55 /* unknown __VISAGECC__, __SYMANTECCC__ */
  56
  57 #if defined(__VISUALC__) || defined(__BORLANDC__) || defined(__WATCOMC__)
  58     #include <float.h>
  59     #define wxFinite(x) _finite(x)
  60 #elif defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
  61       defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
  62       defined(__HPUX__)||defined(__MWERKS__)
  63     #define wxFinite(x) finite(x)
  64 #else
  65     #define wxFinite(x) ((x) == (x))
  66 #endif
  67
  68
  69 #if defined(__VISUALC__)||defined(__BORLAND__)
  70     #define wxIsNaN(x) _isnan(x)
  71 #elif defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
  72       defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
  73       defined(__HPUX__)||defined(__MWERKS__)
  74     #define wxIsNaN(x) isnan(x)
  75 #else
  76     #define wxIsNaN(x) ((x) != (x))
  77 #endif
  78
  79 #ifdef __cplusplus
  80
  81     #ifdef __INTELC__
  82
  83         inline bool wxIsSameDouble(double x, double y)
  84         {
  85             // VZ: this warning, given for operators==() and !=() is not wrong, as ==
  86             //     shouldn't be used with doubles, but we get too many of them and
  87             //     removing these operators is probably not a good idea
  88             //
  89             //     Maybe we should alway compare doubles up to some "epsilon" precision
  90             #pragma warning(push)
  91
  92             // floating-point equality and inequality comparisons are unreliable
  93             #pragma warning(disable: 1572)
  94
  95             return x == y;
  96
  97             #pragma warning(pop)
  98         }
  99
 100     #else /* !__INTELC__ */
 101
 102         inline bool wxIsSameDouble(double x, double y) { return x == y; }
 103
 104     #endif /* __INTELC__/!__INTELC__ */
 105
 106     inline bool wxIsNullDouble(double x) { return wxIsSameDouble(x, 0.); }
 107
 108     #if defined(HAVE_ROUND) && !defined(HAVE_DECL_ROUND)
 109         extern "C" double round(double);
 110     #endif
 111     inline int wxRound(double x)
 112     {
 113         #if defined(HAVE_ROUND)
 114             return int(round(x));
 115         #else
 116             return (int)(x < 0 ? x - 0.5 : x + 0.5);
 117         #endif
 118     }
 119 #endif /* __cplusplus */
 120
 121
 122 #if defined(__WXMSW__) && !defined(__WXWINCE__)
 123     #define wxMulDivInt32( a , b , c ) ::MulDiv( a , b , c )
 124 #elif defined( __WXMAC__ )
 125     #define wxMulDivInt32( a , b , c ) ( (wxInt32) ( ( (wxInt64)(a) * (wxInt64)(b) ) / (wxInt64)(c) ) )
 126 #else
 127     #define wxMulDivInt32( a , b , c ) ((wxInt32)((a)*(((wxDouble)b)/((wxDouble)c))))
 128 #endif
 129
 130 #if wxUSE_APPLE_IEEE
 131 #ifdef __cplusplus
 132     extern "C" {
 133 #endif
 134     /* functions from common/extended.c */
 135     extern wxFloat64 ConvertFromIeeeExtended(const wxInt8 *bytes);
 136     extern void ConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes);
 137 #ifdef __cplusplus
 138     }
 139 #endif
 140 #endif /* wxUSE_APPLE_IEEE */
 141
 142
 143 #endif /* _WX_MATH_H_ */