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<?php
/**
* webtrees: online genealogy
* Copyright (C) 2026 webtrees development team
* This program 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.
* 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
declare(strict_types=1);
namespace Fisharebest\Webtrees\Services;
use Fisharebest\Webtrees\Family;
use Fisharebest\Webtrees\Individual;
use Illuminate\Support\Collection;
/**
* Find ancestors, descendants, cousins, etc for drawing charts.
*/
class ChartService
{
/**
* Find the ancestors of an individual, indexed by their Sosa-Stradonitz number.
*
* @param Individual $individual Start with this individual
* @param int $generations Fetch this number of generations
*
* @return Collection<int,Individual>
*/
public function sosaStradonitzAncestors(Individual $individual, int $generations): Collection
{
$ancestors = [1 => $individual];
$queue = [1];
$max = 2 ** ($generations - 1);
while ($queue !== []) {
$sosa_stradonitz_number = array_shift($queue);
if ($sosa_stradonitz_number >= $max) {
break;
}
$family = $ancestors[$sosa_stradonitz_number]->childFamilies()->first();
if ($family instanceof Family) {
if ($family->husband() instanceof Individual) {
$ancestors[$sosa_stradonitz_number * 2] = $family->husband();
$queue[] = $sosa_stradonitz_number * 2;
}
if ($family->wife() instanceof Individual) {
$ancestors[$sosa_stradonitz_number * 2 + 1] = $family->wife();
$queue[] = $sosa_stradonitz_number * 2 + 1;
}
}
}
return new Collection($ancestors);
}
/**
* Find the descendants of an individual.
*
* @param Individual $individual Start with this individual
* @param int $generations Fetch this number of generations
*
* @return Collection<int,Individual>
*/
public function descendants(Individual $individual, int $generations): Collection
{
$descendants = new Collection([$individual->xref() => $individual]);
if ($generations > 0) {
foreach ($individual->spouseFamilies() as $family) {
foreach ($family->children() as $child) {
if (!$descendants->has($child->xref())) {
$descendants = $descendants->merge($this->descendants($child, $generations - 1));
}
}
}
}
return $descendants->values();
}
/**
* Find the descendants of an individual.
*
* @param Individual $individual Start with this individual
* @param int $generations Fetch this number of generations
*
* @return Collection<int,Family>
*/
public function descendantFamilies(Individual $individual, int $generations): Collection
{
$descendants = $individual->spouseFamilies();
if ($generations > 0) {
foreach ($descendants as $family) {
foreach ($family->children() as $child) {
$descendants = $descendants->merge($this->descendantFamilies($child, $generations - 1));
}
}
}
return $descendants;
}
}
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