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/*
* detgeom.c
*
* Utility functions for detgeom structure
*
* Copyright © 2019-2020 Deutsches Elektronen-Synchrotron DESY,
* a research centre of the Helmholtz Association.
*
* Authors:
* 2020 Thomas White <taw@physics.org>
*
* This file is part of CrystFEL.
*
* CrystFEL is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* CrystFEL 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with CrystFEL. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <math.h>
#include "detgeom.h"
/**
* \file detgeom.h
*/
void detgeom_transform_coords(struct detgeom_panel *p,
double fs, double ss,
double wavelength,
double *r)
{
double ctt, twotheta;
double xs, ys, zs;
double az;
/* Calculate 3D position of given position, in m */
xs = (p->cnx + fs*p->fsx + ss*p->ssx) * p->pixel_pitch;
ys = (p->cny + fs*p->fsy + ss*p->ssy) * p->pixel_pitch;
zs = (p->cnz + fs*p->fsz + ss*p->ssz) * p->pixel_pitch;
ctt = zs/sqrt(xs*xs + ys*ys + zs*zs);
twotheta = acos(ctt);
az = atan2(ys, xs);
r[0] = sin(twotheta)*cos(az) / wavelength;
r[1] = sin(twotheta)*sin(az) / wavelength;
r[2] = (ctt - 1.0) / wavelength;
}
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