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: 1 inch = 2.54 cm */
  26 #ifndef METRIC_CONVERSION_CONSTANT
  27     #define METRIC_CONVERSION_CONSTANT (1/25.4)
  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(__MINGW64__)
  61     // add more compilers with C99 support here: using C99 isfinite() is
  62     // preferable to using BSD-ish finite()
  63     #define wxFinite(x) isfinite(x)
  64 #elif ( defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
  65       defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
  66       defined(__HPUX__)||defined(__MWERKS__) ) && ( !defined(wxOSX_USE_IPHONE) || wxOSX_USE_IPHONE == 0 )
  67 #ifdef __SOLARIS__
  68 #include <ieeefp.h>
  69 #endif
  70     #define wxFinite(x) finite(x)
  71 #else
  72     #define wxFinite(x) ((x) == (x))
  73 #endif
  74
  75
  76 #if defined(__VISUALC__)||defined(__BORLAND__)
  77     #define wxIsNaN(x) _isnan(x)
  78 #elif defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
  79       defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
  80       defined(__HPUX__)||defined(__MWERKS__)
  81     #define wxIsNaN(x) isnan(x)
  82 #else
  83     #define wxIsNaN(x) ((x) != (x))
  84 #endif
  85
  86 #ifdef __cplusplus
  87
  88     #ifdef __INTELC__
  89
  90         inline bool wxIsSameDouble(double x, double y)
  91         {
  92             // VZ: this warning, given for operators==() and !=() is not wrong, as ==
  93             //     shouldn't be used with doubles, but we get too many of them and
  94             //     removing these operators is probably not a good idea
  95             //
  96             //     Maybe we should always compare doubles up to some "epsilon" precision
  97             #pragma warning(push)
  98
  99             // floating-point equality and inequality comparisons are unreliable
 100             #pragma warning(disable: 1572)
 101
 102             return x == y;
 103
 104             #pragma warning(pop)
 105         }
 106
 107     #else /* !__INTELC__ */
 108
 109         inline bool wxIsSameDouble(double x, double y) { return x == y; }
 110
 111     #endif /* __INTELC__/!__INTELC__ */
 112
 113     inline bool wxIsNullDouble(double x) { return wxIsSameDouble(x, 0.); }
 114
 115     inline int wxRound(double x)
 116     {
 117         wxASSERT_MSG( x > INT_MIN - 0.5 && x < INT_MAX + 0.5,
 118                       wxT("argument out of supported range") );
 119
 120         #if defined(HAVE_ROUND)
 121             return int(round(x));
 122         #else
 123             return (int)(x < 0 ? x - 0.5 : x + 0.5);
 124         #endif
 125     }
 126 #endif /* __cplusplus */
 127
 128
 129 #if defined(__WXMSW__) && !defined(__WXWINCE__)
 130     #define wxMulDivInt32( a , b , c ) ::MulDiv( a , b , c )
 131 #else
 132     #define wxMulDivInt32( a , b , c ) (wxRound((a)*(((wxDouble)b)/((wxDouble)c))))
 133 #endif
 134
 135 #if wxUSE_APPLE_IEEE
 136 #ifdef __cplusplus
 137     extern "C" {
 138 #endif
 139     /* functions from common/extended.c */
 140     WXDLLIMPEXP_BASE wxFloat64 wxConvertFromIeeeExtended(const wxInt8 *bytes);
 141     WXDLLIMPEXP_BASE void wxConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes);
 142
 143     /* use wxConvertFromIeeeExtended() and wxConvertToIeeeExtended() instead */
 144 #if WXWIN_COMPATIBILITY_2_8
 145     wxDEPRECATED( WXDLLIMPEXP_BASE wxFloat64 ConvertFromIeeeExtended(const wxInt8 *bytes) );
 146     wxDEPRECATED( WXDLLIMPEXP_BASE void ConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes) );
 147 #endif // WXWIN_COMPATIBILITY_2_8
 148
 149 #ifdef __cplusplus
 150     }
 151 #endif
 152 #endif /* wxUSE_APPLE_IEEE */
 153
 154
 155 #endif /* _WX_MATH_H_ */