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/*
* Project: The SPD Image correction and azimuthal regrouping
* http://forge.epn-campus.eu/projects/show/azimuthal
*
* Copyright (C) 2005-2010 European Synchrotron Radiation Facility
* Grenoble, France
*
* Principal authors: P. Boesecke (boesecke@esrf.fr)
* R. Wilcke (wilcke@esrf.fr)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* and the GNU Lesser General Public License along with this program.
* If not, see <http://www.gnu.org/licenses/>.
*/
/*+++***********************************************************************
NAME
polarization.h
SYNOPSIS
#include "polarization.h"
DESCRIPTION
Header of the module "polarization.c"
***********************************************************************---*/
#ifndef _POLARIZATION_
# define _POLARIZATION_
/***************************************************************************
* General Definitions *
***************************************************************************/
#ifndef PRIVATE
# define PRIVATE static /* used to declare variables of private type */
# define PUBLIC /* used to declare variables of public type */
#endif
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# include <ctype.h>
# include <limits.h>
# include <errno.h>
# include <stdio.h>
# include <fcntl.h>
# include <math.h>
# include <float.h>
# include "waxs.h"
# include "raster.h"
/******************************************************************************
* Type Defs *
******************************************************************************/
typedef struct polarization_params {
int Init;
long Ori; // orientation (1..16)
double P; // polarization (0<=P<=1)
double PChi; // Poincaré angle chi (ellipticity) (-pi/4<=PChi<=pi/4)
double PPsi; // Poincaré angle psi (polarization direction)
double Factor; // Multiplication factor f*f = n/A * re*re
int Invert; // Invert polarization factor
// calculated values
double halfOnePlusCos2ChiCos2Psi; // 0.5*(1+cos(2*Chi)*cos(2*Psi)
double halfOneMinusCos2ChiCos2Psi; // 0.5*(1-cos(2*Chi)*cos(2*Psi)
double Cos2ChiSin2Psi; // Cos2ChiSin2Psi
WParams wparams; // Waxs parameters
} PParams;
/*===========================================================================*/
/***************************************************************************
* Functions *
***************************************************************************/
PUBLIC extern int
polarization_Init ( PParams * pParams, long ori,
double k, double rot1, double rot2, double rot3,
double P, double PChi, double PPsi, double Factor,
int Invert );
PUBLIC extern void
polarization_PrintParams ( FILE * out, PParams Params );
PUBLIC extern double
polarization_factor ( PParams * pParams,
WaxsCoord wc, int projection);
#endif
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