e871a2157d
It is needed in wxMSW code and it looks like it could be useful to the library users, so make it public. See #16254. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77019 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
172 lines
4.7 KiB
C++
172 lines
4.7 KiB
C++
/**
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* Name: wx/math.h
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* Purpose: Declarations/definitions of common math functions
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* Author: John Labenski and others
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* Modified by:
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* Created: 02/02/03
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* Copyright: (c) John Labenski
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* Licence: wxWindows licence
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*/
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/* THIS IS A C FILE, DON'T USE C++ FEATURES (IN PARTICULAR COMMENTS) IN IT */
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#ifndef _WX_MATH_H_
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#define _WX_MATH_H_
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#include "wx/defs.h"
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#include <math.h>
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#ifndef M_PI
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#define M_PI 3.1415926535897932384626433832795
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#endif
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/* Scaling factors for various unit conversions: 1 inch = 2.54 cm */
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#ifndef METRIC_CONVERSION_CONSTANT
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#define METRIC_CONVERSION_CONSTANT (1/25.4)
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#endif
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#ifndef mm2inches
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#define mm2inches (METRIC_CONVERSION_CONSTANT)
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#endif
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#ifndef inches2mm
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#define inches2mm (1/(mm2inches))
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#endif
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#ifndef mm2twips
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#define mm2twips (METRIC_CONVERSION_CONSTANT*1440)
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#endif
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#ifndef twips2mm
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#define twips2mm (1/(mm2twips))
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#endif
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#ifndef mm2pt
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#define mm2pt (METRIC_CONVERSION_CONSTANT*72)
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#endif
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#ifndef pt2mm
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#define pt2mm (1/(mm2pt))
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#endif
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#ifdef __cplusplus
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/* Any C++11 compiler should provide isfinite() */
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#if __cplusplus >= 201103
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#include <cmath>
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#define wxFinite(x) std::isfinite(x)
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#elif defined(__VISUALC__) || defined(__BORLANDC__)
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#include <float.h>
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#define wxFinite(x) _finite(x)
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#elif defined(__MINGW64_TOOLCHAIN__) || defined(__clang__)
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/*
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add more compilers with C99 support here: using C99 isfinite() is
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preferable to using BSD-ish finite()
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*/
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#if defined(_GLIBCXX_CMATH) || defined(_LIBCPP_CMATH)
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// these <cmath> headers #undef isfinite
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#define wxFinite(x) std::isfinite(x)
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#else
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#define wxFinite(x) isfinite(x)
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#endif
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#elif ( defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
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defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
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defined(__HPUX__) ) && ( !defined(wxOSX_USE_IPHONE) || wxOSX_USE_IPHONE == 0 )
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#ifdef __SOLARIS__
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#include <ieeefp.h>
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#endif
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#define wxFinite(x) finite(x)
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#else
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#define wxFinite(x) ((x) == (x))
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#endif
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#if defined(__VISUALC__)||defined(__BORLAND__)
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#define wxIsNaN(x) _isnan(x)
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#elif defined(__GNUG__)||defined(__GNUWIN32__)||defined(__DJGPP__)|| \
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defined(__SGI_CC__)||defined(__SUNCC__)||defined(__XLC__)|| \
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defined(__HPUX__)
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#define wxIsNaN(x) isnan(x)
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#else
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#define wxIsNaN(x) ((x) != (x))
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#endif
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#ifdef __INTELC__
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inline bool wxIsSameDouble(double x, double y)
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{
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// VZ: this warning, given for operators==() and !=() is not wrong, as ==
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// shouldn't be used with doubles, but we get too many of them and
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// removing these operators is probably not a good idea
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//
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// Maybe we should always compare doubles up to some "epsilon" precision
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#pragma warning(push)
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// floating-point equality and inequality comparisons are unreliable
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#pragma warning(disable: 1572)
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return x == y;
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#pragma warning(pop)
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}
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#else /* !__INTELC__ */
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wxGCC_WARNING_SUPPRESS(float-equal)
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inline bool wxIsSameDouble(double x, double y) { return x == y; }
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wxGCC_WARNING_RESTORE(float-equal)
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#endif /* __INTELC__/!__INTELC__ */
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inline bool wxIsNullDouble(double x) { return wxIsSameDouble(x, 0.); }
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inline int wxRound(double x)
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{
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wxASSERT_MSG( x > INT_MIN - 0.5 && x < INT_MAX + 0.5,
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wxT("argument out of supported range") );
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#if defined(HAVE_ROUND)
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return int(round(x));
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#else
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return (int)(x < 0 ? x - 0.5 : x + 0.5);
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#endif
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}
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// Convert between degrees and radians.
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inline double wxDegToRad(double deg) { return (deg * M_PI) / 180.0; }
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inline double wxRadToDeg(double rad) { return (rad * 180.0) / M_PI; }
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#endif /* __cplusplus */
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#if defined(__WINDOWS__) && !defined(__WXWINCE__)
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#define wxMulDivInt32( a , b , c ) ::MulDiv( a , b , c )
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#else
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#define wxMulDivInt32( a , b , c ) (wxRound((a)*(((wxDouble)b)/((wxDouble)c))))
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#endif
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#if wxUSE_APPLE_IEEE
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* functions from common/extended.c */
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WXDLLIMPEXP_BASE wxFloat64 wxConvertFromIeeeExtended(const wxInt8 *bytes);
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WXDLLIMPEXP_BASE void wxConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes);
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/* use wxConvertFromIeeeExtended() and wxConvertToIeeeExtended() instead */
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#if WXWIN_COMPATIBILITY_2_8
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wxDEPRECATED( WXDLLIMPEXP_BASE wxFloat64 ConvertFromIeeeExtended(const wxInt8 *bytes) );
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wxDEPRECATED( WXDLLIMPEXP_BASE void ConvertToIeeeExtended(wxFloat64 num, wxInt8 *bytes) );
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* wxUSE_APPLE_IEEE */
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/* Compute the greatest common divisor of two positive integers */
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WXDLLIMPEXP_BASE unsigned int wxGCD(unsigned int u, unsigned int v);
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#endif /* _WX_MATH_H_ */
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