aboutsummaryrefslogtreecommitdiff
path: root/libcrystfel/src/detgeom.c
blob: 392b9b699b899c53e02c2f458ac2faaaac34fd66 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
/*
 * 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 <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 *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;
}


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, r);
	max_res = biggest(max_res, modulus(r[0], r[1], r[2]));

	detgeom_transform_coords(p, 0, p->h, wavelength, r);
	max_res = biggest(max_res, modulus(r[0], r[1], r[2]));

	detgeom_transform_coords(p, p->w, 0, wavelength, r);
	max_res = biggest(max_res, modulus(r[0], r[1], r[2]));

	detgeom_transform_coords(p, p->w, p->h, wavelength, 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;
}