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 #ifdef __cplusplus
  55
  56 /* Any C++11 compiler should provide isfinite() */
  57 #if __cplusplus >= 201103
  58     #include <cmath>
  59     #define wxFinite(x) std::isfinite(x)
  60 #elif defined(__VISUALC__) || defined(__BORLANDC__) || defined(__WATCOMC__)
  61     #include <float.h>
  62     #define wxFinite(x) _finite(x)
  63 #elif defined(__MINGW64__) || defined(__clang__)
  64     /*
  65         add more compilers with C99 support here: using C99 isfinite() is
  66         preferable to using BSD-ish finite()
  67      */
  68     #if defined(_GLIBCXX_CMATH) || defined(_LIBCPP_CMATH)
  69         // these <cmath> headers #undef isfinite
  70         #define wxFinite(x) std::isfinite(x)
  71     #else
  72         #define wxFinite(x) isfinite(x)
  73     #endif
  74 #elif ( defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
  75       defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
  76       defined(__HPUX__) ) && ( !defined(wxOSX_USE_IPHONE) || wxOSX_USE_IPHONE == 0 )
  77 #ifdef __SOLARIS__
  78 #include <ieeefp.h>
  79 #endif
  80     #define wxFinite(x) finite(x)
  81 #else
  82     #define wxFinite(x) ((x) == (x))
  83 #endif
  84
  85
  86 #if defined(__VISUALC__)||defined(__BORLAND__)
  87     #define wxIsNaN(x) _isnan(x)
  88 #elif defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
  89       defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
  90       defined(__HPUX__)
  91     #define wxIsNaN(x) isnan(x)
  92 #else
  93     #define wxIsNaN(x) ((x) != (x))
  94 #endif
  95
  96 #ifdef __INTELC__
  97
  98     inline bool wxIsSameDouble(double x, double y)
  99     {
 100         // VZ: this warning, given for operators==() and !=() is not wrong, as ==
 101         //     shouldn't be used with doubles, but we get too many of them and
 102         //     removing these operators is probably not a good idea
 103         //
 104         //     Maybe we should always compare doubles up to some "epsilon" precision
 105         #pragma warning(push)
 106
 107         // floating-point equality and inequality comparisons are unreliable
 108         #pragma warning(disable: 1572)
 109
 110         return x == y;
 111
 112         #pragma warning(pop)
 113     }
 114
 115 #else /* !__INTELC__ */
 116     wxGCC_WARNING_SUPPRESS(float-equal)
 117     inline bool wxIsSameDouble(double x, double y) { return x == y; }
 118     wxGCC_WARNING_RESTORE(float-equal)
 119
 120 #endif /* __INTELC__/!__INTELC__ */
 121
 122 inline bool wxIsNullDouble(double x) { return wxIsSameDouble(x, 0.); }
 123
 124 inline int wxRound(double x)
 125 {
 126     wxASSERT_MSG( x > INT_MIN - 0.5 && x < INT_MAX + 0.5,
 127                   wxT("argument out of supported range") );
 128
 129     #if defined(HAVE_ROUND)
 130         return int(round(x));
 131     #else
 132         return (int)(x < 0 ? x - 0.5 : x + 0.5);
 133     #endif
 134 }
 135
 136 #endif /* __cplusplus */
 137
 138
 139 #if defined(__WINDOWS__) && !defined(__WXWINCE__)
 140     #define wxMulDivInt32( a , b , c ) ::MulDiv( a , b , c )
 141 #else
 142     #define wxMulDivInt32( a , b , c ) (wxRound((a)*(((wxDouble)b)/((wxDouble)c))))
 143 #endif
 144
 145 #if wxUSE_APPLE_IEEE
 146 #ifdef __cplusplus
 147     extern "C" {
 148 #endif
 149     /* functions from common/extended.c */
 150     WXDLLIMPEXP_BASE wxFloat64 wxConvertFromIeeeExtended(const wxInt8 *bytes);
 151     WXDLLIMPEXP_BASE void wxConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes);
 152
 153     /* use wxConvertFromIeeeExtended() and wxConvertToIeeeExtended() instead */
 154 #if WXWIN_COMPATIBILITY_2_8
 155     wxDEPRECATED( WXDLLIMPEXP_BASE wxFloat64 ConvertFromIeeeExtended(const wxInt8 *bytes) );
 156     wxDEPRECATED( WXDLLIMPEXP_BASE void ConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes) );
 157 #endif
 158
 159 #ifdef __cplusplus
 160     }
 161 #endif
 162 #endif /* wxUSE_APPLE_IEEE */
 163
 164
 165 #endif /* _WX_MATH_H_ */