xref: /webtrees/app/Services/ChartService.php (revision 36779af1bd0601de7819554b13a393f6edb92507) 
1<?php
2
3/**
4 * webtrees: online genealogy
5 * Copyright (C) 2021 webtrees development team
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <https://www.gnu.org/licenses/>.
16 */
17
18declare(strict_types=1);
19
20namespace Fisharebest\Webtrees\Services;
21
22use Fisharebest\Webtrees\Family;
23use Fisharebest\Webtrees\Individual;
24use Illuminate\Support\Collection;
25
26/**
27 * Find ancestors, descendants, cousins, etc for drawing charts.
28 */
29class ChartService
30{
31    /**
32     * Find the ancestors of an individual, indexed by their Sosa-Stradonitz number.
33     *
34     * @param Individual $individual  Start with this individual
35     * @param int        $generations Fetch this number of generations
36     *
37     * @return Collection<int,Individual>
38     */
39    public function sosaStradonitzAncestors(Individual $individual, int $generations): Collection
40    {
41        $ancestors = [1 => $individual];
42
43        $queue = [1];
44
45        $max = 2 ** ($generations - 1);
46
47        while ($queue !== []) {
48            $sosa_stradonitz_number = array_shift($queue);
49
50            if ($sosa_stradonitz_number >= $max) {
51                break;
52            }
53
54            $family = $ancestors[$sosa_stradonitz_number]->childFamilies()->first();
55
56            if ($family instanceof Family) {
57                if ($family->husband() instanceof Individual) {
58                    $ancestors[$sosa_stradonitz_number * 2] = $family->husband();
59                    $queue[] = $sosa_stradonitz_number * 2;
60                }
61
62                if ($family->wife() instanceof Individual) {
63                    $ancestors[$sosa_stradonitz_number * 2 + 1] = $family->wife();
64                    $queue[] = $sosa_stradonitz_number * 2 + 1;
65                }
66            }
67        }
68
69        return new Collection($ancestors);
70    }
71
72    /**
73     * Find the descendants of an individual.
74     *
75     * @param Individual $individual  Start with this individual
76     * @param int        $generations Fetch this number of generations
77     *
78     * @return Collection<int,Individual>
79     */
80    public function descendants(Individual $individual, int $generations): Collection
81    {
82        $descendants = new Collection([$individual->xref() => $individual]);
83
84        if ($generations > 0) {
85            foreach ($individual->spouseFamilies() as $family) {
86                foreach ($family->children() as $child) {
87                    if (!$descendants->has($child->xref())) {
88                        $descendants = $descendants->merge($this->descendants($child, $generations - 1));
89                    }
90                }
91            }
92        }
93
94        return $descendants;
95    }
96
97    /**
98     * Find the descendants of an individual.
99     *
100     * @param Individual $individual  Start with this individual
101     * @param int        $generations Fetch this number of generations
102     *
103     * @return Collection<int,Individual>
104     */
105    public function descendantFamilies(Individual $individual, int $generations): Collection
106    {
107        $descendants = new Collection($individual->spouseFamilies());
108
109        if ($generations > 0) {
110            foreach ($descendants as $family) {
111                foreach ($family->children() as $child) {
112                    $descendants = $descendants->merge($this->descendantFamilies($child, $generations - 1));
113                }
114            }
115        }
116
117        return $descendants;
118    }
119}
120