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/*
* detgeom.c
*
* Utility functions for detgeom structure
*
* Copyright © 2019-2021 Deutsches Elektronen-Synchrotron DESY,
* a research centre of the Helmholtz Association.
*
* Authors:
* 2020-2021 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 <stdlib.h>
#include "detgeom.h"
#include "utils.h"
/**
* \file detgeom.h
*/
void detgeom_transform_coords(struct detgeom_panel *p,
double fs, double ss,
double wavelength,
double dx, double dy,
double *r)
{
double xs, ys, zs;
double fac;
/* Calculate 3D position of given position, in pixels */
xs = p->cnx + fs*p->fsx + ss*p->ssx + dx*p->pixel_pitch;
ys = p->cny + fs*p->fsy + ss*p->ssy + dy*p->pixel_pitch;
zs = p->cnz + fs*p->fsz + ss*p->ssz;
fac = wavelength * sqrt(xs*xs + ys*ys + zs*zs);
r[0] = xs / fac;
r[1] = ys / fac;
r[2] = zs / fac - 1.0/wavelength;
}
void detgeom_free(struct detgeom *detgeom)
{
int i;
for ( i=0; i<detgeom->n_panels; i++ ) {
free(detgeom->panels[i].name);
}
free(detgeom->panels);
free(detgeom);
}
static double panel_max_res(struct detgeom_panel *p,
double wavelength)
{
double r[3];
double max_res = 0.0;
detgeom_transform_coords(p, 0, 0, wavelength, 0.0, 0.0, r);
max_res = biggest(max_res, modulus(r[0], r[1], r[2]));
detgeom_transform_coords(p, 0, p->h, wavelength, 0.0, 0.0, r);
max_res = biggest(max_res, modulus(r[0], r[1], r[2]));
detgeom_transform_coords(p, p->w, 0, wavelength, 0.0, 0.0, r);
max_res = biggest(max_res, modulus(r[0], r[1], r[2]));
detgeom_transform_coords(p, p->w, p->h, wavelength, 0.0, 0.0, r);
max_res = biggest(max_res, modulus(r[0], r[1], r[2]));
return max_res;
}
double detgeom_max_resolution(struct detgeom *detgeom,
double wavelength)
{
int i;
double max_res = 0.0;
for ( i=0; i<detgeom->n_panels; i++ ) {
double panel_maxres;
panel_maxres = panel_max_res(&detgeom->panels[i],
wavelength);
if ( panel_maxres > max_res ) {
max_res = panel_maxres;
}
}
return max_res;
}
void show_panel(struct detgeom_panel *p)
{
STATUS("Panel '%s':\n", p->name);
STATUS(" Size %i x %i px\n", p->w, p->h);
STATUS(" Transformation [cnx] + [%6.2f %6.2f] [fs] = [x]\n",
p->fsx, p->ssx);
STATUS(" [cny] + [%6.2f %6.2f] [ss] = [y]\n",
p->fsy, p->ssy);
STATUS(" [cnz] + [%6.2f %6.2f] = [z]\n",
p->fsz, p->ssz);
STATUS(" corner x,y,z = %f, %f, %f px\n",
p->cnx, p->cny, p->cnz);
STATUS(" = %f, %f, %f mm\n",
p->cnx*p->pixel_pitch*1e3,
p->cny*p->pixel_pitch*1e3,
p->cnz*p->pixel_pitch*1e3);
STATUS(" %f adu/photon, max %f adu\n",
p->adu_per_photon, p->max_adu);
}
static double clen(struct detgeom *dg, int i)
{
return dg->panels[i].cnz * dg->panels[i].pixel_pitch;
}
static double far_corner_clen(struct detgeom *dg, int i)
{
struct detgeom_panel *p = &dg->panels[i];
return (p->cnz + p->fsz*p->w + p->ssz*p->h) * p->pixel_pitch;
}
/* Return mean clen in m, or NAN in the following circumstances:
* 1. If the individual panel distances vary by more than 10% of the average
* 2. If the tilt of the panel creates a distance variation of more than 10%
* of the corner value over the extent of the panel */
double detgeom_mean_camera_length(struct detgeom *dg)
{
int i;
double mean;
double total = 0.0;
for ( i=0; i<dg->n_panels; i++ ) {
total += clen(dg, i);
}
mean = total / dg->n_panels;
for ( i=0; i<dg->n_panels; i++ ) {
if ( !within_tolerance(clen(dg, i), mean, 10.0) ) return NAN;
if ( !within_tolerance(clen(dg, i), far_corner_clen(dg, i), 10.0) ) return NAN;
}
return mean;
}
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