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 * Copyright:   (c) John Labenski
   8 * Licence:     wxWindows licence
   9 */
  10
  11 /* THIS IS A C FILE, DON'T USE C++ FEATURES (IN PARTICULAR COMMENTS) IN IT */
  12
  13 #ifndef _WX_MATH_H_
  14 #define _WX_MATH_H_
  15
  16 #include "wx/defs.h"
  17
  18 #include <math.h>
  19
  20 #ifndef M_PI
  21     #define M_PI 3.1415926535897932384626433832795
  22 #endif
  23
  24 /* Scaling factors for various unit conversions: 1 inch = 2.54 cm */
  25 #ifndef METRIC_CONVERSION_CONSTANT
  26     #define METRIC_CONVERSION_CONSTANT (1/25.4)
  27 #endif
  28
  29 #ifndef mm2inches
  30     #define mm2inches (METRIC_CONVERSION_CONSTANT)
  31 #endif
  32
  33 #ifndef inches2mm
  34     #define inches2mm (1/(mm2inches))
  35 #endif
  36
  37 #ifndef mm2twips
  38     #define mm2twips (METRIC_CONVERSION_CONSTANT*1440)
  39 #endif
  40
  41 #ifndef twips2mm
  42     #define twips2mm (1/(mm2twips))
  43 #endif
  44
  45 #ifndef mm2pt
  46     #define mm2pt (METRIC_CONVERSION_CONSTANT*72)
  47 #endif
  48
  49 #ifndef pt2mm
  50     #define pt2mm (1/(mm2pt))
  51 #endif
  52
  53
  54 /* unknown __VISAGECC__, __SYMANTECCC__ */
  55
  56 #if defined(__VISUALC__) || defined(__BORLANDC__) || defined(__WATCOMC__)
  57     #include <float.h>
  58     #define wxFinite(x) _finite(x)
  59 #elif defined(__MINGW64__) || defined(__clang__)
  60     /*
  61         add more compilers with C99 support here: using C99 isfinite() is
  62         preferable to using BSD-ish finite()
  63      */
  64     #if defined(_GLIBCXX_CMATH) || defined(_LIBCPP_CMATH)
  65         // these <cmath> headers #undef isfinite
  66         #define wxFinite(x) std::isfinite(x)
  67     #else
  68         #define wxFinite(x) isfinite(x)
  69     #endif
  70 #elif ( defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
  71       defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
  72       defined(__HPUX__) ) && ( !defined(wxOSX_USE_IPHONE) || wxOSX_USE_IPHONE == 0 )
  73 #ifdef __SOLARIS__
  74 #include <ieeefp.h>
  75 #endif
  76     #define wxFinite(x) finite(x)
  77 #else
  78     #define wxFinite(x) ((x) == (x))
  79 #endif
  80
  81
  82 #if defined(__VISUALC__)||defined(__BORLAND__)
  83     #define wxIsNaN(x) _isnan(x)
  84 #elif defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
  85       defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
  86       defined(__HPUX__)
  87     #define wxIsNaN(x) isnan(x)
  88 #else
  89     #define wxIsNaN(x) ((x) != (x))
  90 #endif
  91
  92 #ifdef __cplusplus
  93
  94     #ifdef __INTELC__
  95
  96         inline bool wxIsSameDouble(double x, double y)
  97         {
  98             // VZ: this warning, given for operators==() and !=() is not wrong, as ==
  99             //     shouldn't be used with doubles, but we get too many of them and
 100             //     removing these operators is probably not a good idea
 101             //
 102             //     Maybe we should always compare doubles up to some "epsilon" precision
 103             #pragma warning(push)
 104
 105             // floating-point equality and inequality comparisons are unreliable
 106             #pragma warning(disable: 1572)
 107
 108             return x == y;
 109
 110             #pragma warning(pop)
 111         }
 112
 113     #else /* !__INTELC__ */
 114         wxGCC_WARNING_SUPPRESS(float-equal)
 115         inline bool wxIsSameDouble(double x, double y) { return x == y; }
 116         wxGCC_WARNING_RESTORE(float-equal)
 117
 118     #endif /* __INTELC__/!__INTELC__ */
 119
 120     inline bool wxIsNullDouble(double x) { return wxIsSameDouble(x, 0.); }
 121
 122     inline int wxRound(double x)
 123     {
 124         wxASSERT_MSG( x > INT_MIN - 0.5 && x < INT_MAX + 0.5,
 125                       wxT("argument out of supported range") );
 126
 127         #if defined(HAVE_ROUND)
 128             return int(round(x));
 129         #else
 130             return (int)(x < 0 ? x - 0.5 : x + 0.5);
 131         #endif
 132     }
 133 #endif /* __cplusplus */
 134
 135
 136 #if defined(__WINDOWS__) && !defined(__WXWINCE__)
 137     #define wxMulDivInt32( a , b , c ) ::MulDiv( a , b , c )
 138 #else
 139     #define wxMulDivInt32( a , b , c ) (wxRound((a)*(((wxDouble)b)/((wxDouble)c))))
 140 #endif
 141
 142 #if wxUSE_APPLE_IEEE
 143 #ifdef __cplusplus
 144     extern "C" {
 145 #endif
 146     /* functions from common/extended.c */
 147     WXDLLIMPEXP_BASE wxFloat64 wxConvertFromIeeeExtended(const wxInt8 *bytes);
 148     WXDLLIMPEXP_BASE void wxConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes);
 149
 150     /* use wxConvertFromIeeeExtended() and wxConvertToIeeeExtended() instead */
 151 #if WXWIN_COMPATIBILITY_2_8
 152     wxDEPRECATED( WXDLLIMPEXP_BASE wxFloat64 ConvertFromIeeeExtended(const wxInt8 *bytes) );
 153     wxDEPRECATED( WXDLLIMPEXP_BASE void ConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes) );
 154 #endif
 155
 156 #ifdef __cplusplus
 157     }
 158 #endif
 159 #endif /* wxUSE_APPLE_IEEE */
 160
 161
 162 #endif /* _WX_MATH_H_ */