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/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  PI related constant definitions
*
****************************************************************************/


#define PI              3.1415926535897932384626434

#define TwoPI           (PI*2)      // 6.283185307179586476
#define ThreePIby4      (PI*0.75)   // 3*pi/4
#define PIby2           (PI/2)      // 1.570796326794896619
#define PIby4           (PI/4)
#define PIby6           (PI/6)      // 0.523598775598298873

#define TwobyPI         (2/PI)      // 0.63661977236758134307
#define LnSqrt2PI       0.9189385332046727417803297 // ln(sqrt(2*pi))
#define OnebySqrtPI     0.56418958354775628695      // 1/sqrt(pi)
#define SqrtPI          1.7724538509055160273       // sqrt(pi)

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