path: root/library/WT/Controller/Lifespan.php

<?php
// Controller for the timeline chart
//
// webtrees: Web based Family History software
// Copyright (C) 2014 webtrees development team.
//
// Derived from PhpGedView
// Copyright (C) 2002 to 2010 PGV Development Team.  All rights reserved.
//
// 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 2 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, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

if (!defined('WT_WEBTREES')) {
	header('HTTP/1.0 403 Forbidden');
	exit;
}

function compare_people($a, $b) {
	return WT_Date::Compare($a->getEstimatedBirthDate(), $b->getEstimatedBirthDate());
}

class WT_Controller_Lifespan extends WT_Controller_Page {
	var $pids = array ();
	var $people = array();
	var $place = '';
	var $beginYear = '';
	var $endYear = '';
	var $scale = 2;
	var $YrowLoc = 125;
	var $minYear = 0;

	// The following colours are deliberately omitted from the $colors list:
	// Blue, Red, Black, White, Green
	var $colors = array ('Aliceblue', 'Antiquewhite', 'Aqua', 'Aquamarine', 'Azure', 'Beige', 'Bisque', 'Blanchedalmond', 'Blueviolet', 'Brown', 'Burlywood', 'Cadetblue', 'Chartreuse', 'Chocolate', 'Coral', 'Cornflowerblue', 'Cornsilk', 'Crimson', 'Cyan', 'Darkcyan', 'Darkgoldenrod', 'Darkgray', 'Darkgreen', 'Darkkhaki', 'Darkmagenta', 'Darkolivegreen', 'Darkorange', 'Darkorchid', 'Darkred', 'Darksalmon', 'Darkseagreen', 'Darkslateblue', 'Darkturquoise', 'Darkviolet', 'Deeppink', 'Deepskyblue', 'Dimgray', 'Dodgerblue', 'Firebrick', 'Floralwhite', 'Forestgreen', 'Fuchsia', 'Gainsboro', 'Ghostwhite', 'Gold', 'Goldenrod', 'Gray', 'Greenyellow', 'Honeydew', 'Hotpink', 'Indianred', 'Ivory', 'Khaki', 'Lavender', 'Lavenderblush', 'Lawngreen', 'Lemonchiffon', 'Lightblue', 'Lightcoral', 'Lightcyan', 'Lightgoldenrodyellow', 'Lightgreen', 'Lightgrey', 'Lightpink', 'Lightsalmon', 'Lightseagreen', 'Lightskyblue', 'Lightslategray', 'Lightsteelblue', 'Lightyellow', 'Lime', 'Limegreen', 'Linen', 'Magenta', 'Maroon', 'Mediumaqamarine', ' Mediumblue', 'Mediumorchid', 'Mediumpurple', 'Mediumseagreen', 'Mediumslateblue', 'Mediumspringgreen', 'Mediumturquoise', 'Mediumvioletred', 'Mintcream', 'Mistyrose', 'Moccasin', 'Navajowhite', 'Oldlace', 'Olive', 'Olivedrab', 'Orange', 'Orangered', 'Orchid', 'Palegoldenrod', 'Palegreen', 'Paleturquoise', 'Palevioletred', 'Papayawhip', 'Peachpuff', 'Peru', 'Pink', 'Plum', 'Powderblue', 'Purple', 'Rosybrown', 'Royalblue', 'Saddlebrown', 'Salmon', 'Sandybrown', 'Seagreen', 'Seashell', 'Sienna', 'Silver', 'Skyblue', 'Slateblue', 'Slategray', 'Snow', 'Springgreen', 'Steelblue', 'Tan', 'Teal', 'Thistle', 'Tomato', 'Turquoise', 'Violet', 'Wheat', 'Whitesmoke', 'Yellow', 'YellowGreen');
	var $malecolorR = array(' 100', ' 110', ' 120', ' 130', ' 140', ' 150', ' 160', ' 170', ' 180', ' 190', ' 200', ' 210', ' 220', ' 230', ' 240', ' 250');
	var $malecolorG = array(' 100', ' 110', ' 120', ' 130', ' 140', ' 150', ' 160', ' 170', ' 180', ' 190', ' 200', ' 210', ' 220', ' 230', ' 240', ' 250');
	var $malecolorB = 255;
	var $femalecolorR = 255;
	var $femalecolorG = array(' 100', ' 110', ' 120', ' 130', ' 140', ' 150', ' 160', ' 170', ' 180', ' 190', ' 200', ' 210', ' 220', ' 230', ' 240', ' 250');
	var $femalecolorB = array('250', ' 240', ' 230', ' 220', ' 210', ' 200', ' 190', ' 180', ' 170', ' 160', ' 150', ' 140', ' 130', ' 120', ' 110', ' 100');
	var $color;
	var $colorindex;
	var $Fcolorindex;
	var $Mcolorindex;
	var $zoomfactor;
	var $timelineMinYear;
	var $timelineMaxYear;
	var $birthMod;
	var $deathMod;
	var $endMod = 0;
	var $modTest;
	var $currentYear;
	var $endDate;
	var $startDate;
	var $currentsex;

	private $nonfacts=array('FAMS', 'FAMC', 'MAY', 'BLOB', 'OBJE', 'SEX', 'NAME', 'SOUR', 'NOTE', 'BAPL', 'ENDL', 'SLGC', 'SLGS', '_TODO', '_WT_OBJE_SORT', 'CHAN', 'HUSB', 'WIFE', 'CHIL', 'BIRT', 'DEAT', 'BURI');

	function __construct() {
		global $WT_SESSION;

		parent::__construct();
		$this->setPageTitle(WT_I18N::translate('Lifespans'));

		$this->colorindex = 0;
		$this->Fcolorindex = 0;
		$this->Mcolorindex = 0;
		$this->zoomfactor = 10;
		$this->color = "#0000FF";
		$this->currentYear = date("Y");
		$this->deathMod = 0;
		$this->endDate = $this->currentYear;

		// Request parameters
		$newpid    = WT_Filter::get('newpid', WT_REGEX_XREF);
		$remove    = WT_Filter::get('remove', WT_REGEX_XREF);
		$pids      = WT_Filter::getArray('pids', WT_REGEX_XREF);
		$clear     = WT_Filter::getBool('clear');
		$addfam    = WT_Filter::getBool('addFamily');
		$place     = WT_Filter::get('place');
		$beginYear = WT_Filter::getInteger('beginYear', 0, date('Y')+100, 0);
		$endYear   = WT_Filter::getInteger('endYear',   0, date('Y')+100, 0);

		if ($clear) {
			// Empty list
			$this->pids=array();
		} elseif ($pids) {
			// List of specified records
			$this->pids=$pids;
		} elseif ($place) {
			// All records found in a place
			$wt_place=new WT_Place($place, WT_GED_ID);
			$this->pids=
				WT_DB::prepare("SELECT DISTINCT pl_gid FROM `##placelinks` WHERE pl_p_id=? AND pl_file=?")
				->execute(array($wt_place->getPlaceId(), WT_GED_ID))
				->fetchOneColumn();
			$this->place=$place;
		} else {
			// Modify an existing list of records
			if (is_array($WT_SESSION->timeline_pids)) {
				$this->pids = $WT_SESSION->timeline_pids;
			} else {
				$this->pids=array();
			}
			if ($remove) {
				foreach ($this->pids as $key=>$value) {
					if ($value==$remove) {
						unset($this->pids[$key]);
					}
				}
			} elseif ($newpid) {
				$person=WT_Individual::getInstance($newpid);
				$this->addFamily($person, $addfam);
			} elseif (!$this->pids) {
				$this->addFamily($this->getSignificantIndividual(), false);
			}
		}
		$WT_SESSION->timeline_pids=$this->pids;

		$this->beginYear=$beginYear;
		$this->endYear=$endYear;
		if ($beginYear==0 || $endYear==0) {
			//-- cleanup user input
			$this->pids = array_unique($this->pids);  //removes duplicates
			foreach ($this->pids as $key => $value) {
				if ($value != $remove) {
					$this->pids[$key] = $value;
					$person = WT_Individual::getInstance($value);
					// list of linked records includes families as well as individuals.
					if ($person) {
						$bdate = $person->getEstimatedBirthDate();
						$ddate = $person->getEstimatedDeathDate();
						//--Checks to see if the details of that person can be viewed
						if ($bdate->isOK() && $person->canShow()) {
							$this->people[] = $person;
						}
					}
				}
			}
		}

		//--Finds if the begin year and end year textboxes are not empty
		else {
			//-- reset the people array when doing a year range search
			$this->people = array();
			//Takes the begining year and end year passed by the postback and modifies them and uses them to populate
			//the time line

			//Variables to restrict the person boxes to the year searched.
			//--Searches for individuals who had an even between the year begin and end years
			$indis = self::search_indis_year_range($beginYear, $endYear);
			//--Populates an array of people that had an event within those years

			foreach ($indis as $person) {
				if (empty($searchplace) || in_array($person->getXref(), $this->pids)) {
					$bdate = $person->getEstimatedBirthDate();
					$ddate = $person->getEstimatedDeathDate();
					//--Checks to see if the details of that person can be viewed
					if ($bdate->isOK() && $person->canShow()) {
						$this->people[] = $person;
					}
				}
			}
			$WT_SESSION->timeline_pids=null;
		}

		// Sort the array in order of birth year
		uasort($this->people, "compare_people");
		//If there is people in the array posted back this if occurs
		if (isset ($this->people[0])) {
			//Find the maximum Death year and mimimum Birth year for each individual returned in the array.
			$bdate = $this->people[0]->getEstimatedBirthDate();
			$ddate = $this->people[0]->getEstimatedDeathDate();
			$this->timelineMinYear=$bdate->gregorianYear();
			$this->timelineMaxYear=$ddate->gregorianYear() ? $ddate->gregorianYear() : date('Y');
			foreach ($this->people as $key => $value) {
				$bdate = $value->getEstimatedBirthDate();
				$ddate = $value->getEstimatedDeathDate();
				$this->timelineMinYear=min($this->timelineMinYear, $bdate->gregorianYear());
				$this->timelineMaxYear=max($this->timelineMaxYear, $ddate->gregorianYear() ? $ddate->gregorianYear() : date('Y'));
			}

			if ($this->timelineMaxYear > $this->currentYear) {
				$this->timelineMaxYear = $this->currentYear;
			}

		}
		else {
			// Sets the default timeline length
			$this->timelineMinYear = date("Y") - 101;
			$this->timelineMaxYear = date("Y");
		}
	}

	// Add a person (and optionally their immediate family members) to the pids array
	function addFamily($person, $add_family) {
		if ($person) {
			$this->pids[]=$person->getXref();
			if ($add_family) {
				foreach ($person->getSpouseFamilies() as $family) {
					$spouse = $family->getSpouse($person);
					if ($spouse) {
						$this->pids[]=$spouse->getXref();
						foreach ($family->getChildren() as $child) {
							$this->pids[]=$child->getXref();
						}
					}
				}
				foreach ($person->getChildFamilies() as $family) {
					foreach ($family->getSpouses() as $parent) {
						$this->pids[]=$parent->getXref();
					}
					foreach ($family->getChildren() as $sibling) {
						if ($person !== $sibling) {
							$this->pids[]=$sibling->getXref();
						}
					}
				}
			}
		}
	}

	// sets the start year and end year to a factor of 5
	function ModifyYear($year, $key) {
		$temp = $year;
		switch ($key) {
			case 1 : //rounds beginning year
				$this->birthMod = ($year % 5);
				$year = $year - ($this->birthMod);
				if ($temp == $year) {
					$this->modTest = 0;
				}
				else $this->modTest = 1;
				break;
			case 2 : //rounds end year
				$this->deathMod = ($year % 5);
				//Only executed if the year needs to be modified
				if ($this->deathMod > 0) {
					$this->endMod = (5 - ($this->deathMod));
				}
				else {
					$this->endMod = 0;
				}
				$year = $year + ($this->endMod);
				break;
		}
		return $year;
	}
	//Prints the time line
	function PrintTimeline($startYear, $endYear) {
		$leftPosition = 14; //start point
		$width = 8; //base width
		$height = 10; //standard height
		$tickDistance = 50; //length of one timeline section
		$top = 65; //top starting position
		$yearSpan = 5; //default zoom level
		$newStartYear = $this->ModifyYear($startYear, 1); //starting date for timeline
		$this->timelineMinYear = $newStartYear;
		$newEndYear = $this->ModifyYear($endYear, 2); //ending date for timeline
		$totalYears = $newEndYear - $newStartYear; //length of timeline
		$timelineTick = $totalYears / $yearSpan; //calculates the length of the timeline

		for ($i = 0; $i < $timelineTick; $i ++) { //prints the timeline
			echo "<div class=\"sublinks_cell\" style=\"text-align: left; position: absolute; top: ", $top, "px; left: ", $leftPosition, "px; width: ", $tickDistance, "px;\">$newStartYear<i class=\"icon-lifespan-chunk\"></i></div>";  //onclick="zoomToggle('100px', '100px', '200px', '200px', this);"
			$leftPosition += $tickDistance;
			$newStartYear += $yearSpan;

		}
		echo "<div class=\"sublinks_cell\" style=\"text-align: left; position: absolute; top: ", $top, "px; left: ", $leftPosition, "px; width: ", $tickDistance, "px;\">$newStartYear</div>";
	}

	//method used to place the person boxes onto the timeline
	function fillTL($ar, $int, $top) {
		global $maxX, $zindex;

		$zindex = count($ar);

		$rows = array();
		$modFix = 0;
		if ($this->modTest == 1) {
			$modFix = (9 * $this->birthMod);
		}
		//base case
		if (count($ar) == 0) return $top;
		$maxY = $top;

		foreach ($ar as $key => $value) {
			//Creates appropriate color scheme to show relationships
			$this->currentsex = $value->getSex();
			if ($this->currentsex == "M") {
				$this->Mcolorindex++;
				if (!isset($this->malecolorR[$this->Mcolorindex])) $this->Mcolorindex=0;
				$this->malecolorR[$this->Mcolorindex];
				$this->Mcolorindex++;
				if (!isset($this->malecolorG[$this->Mcolorindex])) $this->Mcolorindex=0;
				$this->malecolorG[$this->Mcolorindex];
				$red = dechex($this->malecolorR[$this->Mcolorindex]);
				$green =dechex($this->malecolorR[$this->Mcolorindex]);
				if (strlen($red)<2) {
					$red = "0".$red;
				}
				if (strlen($green)<2) {
					$green = "0".$green;
				}

				$this->color = "#".$red.$green.dechex($this->malecolorB);
			}
			else if ($this->currentsex == "F") {
				$this->Fcolorindex++;
				if (!isset($this->femalecolorG[$this->Fcolorindex])) $this->Fcolorindex = 0;
				$this->femalecolorG[$this->Fcolorindex];
				$this->Fcolorindex++;
				if (!isset($this->femalecolorB[$this->Fcolorindex])) $this->Fcolorindex = 0;
				$this->femalecolorB[$this->Fcolorindex];
				$this->color = "#".dechex($this->femalecolorR).dechex($this->femalecolorG[$this->Fcolorindex]).dechex($this->femalecolorB[$this->Fcolorindex]);
			}
			else {
				$this->color = $this->colors[$this->colorindex];
			}

			//set start position and size of person-box according to zoomfactor
			/* @var $value Person */
				$bdate=$value->getEstimatedBirthDate();
				$ddate=$value->getEstimatedDeathDate();
				$birthYear = $bdate->gregorianYear();
				$deathYear = $ddate->gregorianYear() ? $ddate->gregorianYear() : date('Y');

				$width = ($deathYear - $birthYear) * $this->zoomfactor;
				$height = 2 * $this->zoomfactor;

				$startPos = (($birthYear - $this->timelineMinYear) * $this->zoomfactor) + 14 + $modFix;
				$minlength = utf8_strlen(strip_tags($value->getFullName())) * $this->zoomfactor;

				if ($startPos > 15) {
					$startPos = (($birthYear - $this->timelineMinYear) * $this->zoomfactor) + 15 + $modFix;
					$startPos = (($birthYear - $this->timelineMinYear) * $this->zoomfactor) + 15;
					$width = (($deathYear - $birthYear) * $this->zoomfactor) - 2;
				}
				//set start position to deathyear
				$int = $deathYear;
				//set minimum width for single year lifespans
				if ($width < 10)
				{
					$width = 10;
					$int = $birthYear+1;
				}

				$lifespan = "<span dir=\"ltr\">$birthYear-</span>";
				$deathReal = $value->getDeathDate()->isOK();
				$birthReal = $value->getBirthDate()->isOK();
				if ($value->isDead() && $deathReal) $lifespan .= "<span dir=\"ltr\">$deathYear</span>";
				$lifespannumeral = $deathYear - $birthYear;

				//-- calculate a good Y top value
				$Y = $top;
				$Z = $zindex;
				$ready = false;
				while (!$ready) {
					if (!isset($rows[$Y])) {
						$ready = true;
						$rows[$Y]["x1"] = $startPos;
						$rows[$Y]["x2"] = $startPos+$width;
						$rows[$Y]["z"] = $zindex;
					}
					else {
						if ($rows[$Y]["x1"] > $startPos+$width) {
							$ready = true;
							$rows[$Y]["x1"] = $startPos;
							$Z = $rows[$Y]["z"];
						}
						else if ($rows[$Y]["x2"] < $startPos) {
							$ready = true;
							$rows[$Y]["x2"] = $startPos+$width;
							$Z = $rows[$Y]["z"];
						}
						else {
							//move down 25 pixels
							if ($this->zoomfactor > 10)$Y += 25 + $this->zoomfactor;
							else $Y += 25;
						}
					}
				}

				//Need to calculate each event and the spacing between them
				// event1 distance will be event - birthyear   that will be the distance. then each distance will chain off that

				//$event[][]  = {"Cell 1 will hold events"}{"cell2 will hold time between that and the next value"};
				$facts = $value->getFacts();
				foreach ($value->getSpouseFamilies() as $family) {
					foreach ($family->getFacts() as $fact) {
						$facts[] = $fact;
					}
				}
				$unparsedEvents = array();

				foreach ($facts as $fact) {
					if (!in_array($fact->getTag(), $this->nonfacts)) {
						$unparsedEvents[]=$fact;
					}
				}
				sort_facts($unparsedEvents);

				$eventinformation = Array();
				$eventspacing = Array();
				foreach ($unparsedEvents as $index=>$val) {
					$date = $val->getDate();
					if (!empty($date)) {
						$fact = $val->getTag();
						$yearsin = $date->date1->y-$birthYear;
						if ($lifespannumeral==0) {
							$lifespannumeral = 1;
						}
						$eventwidth = ($yearsin/$lifespannumeral)* 100; // percent of the lifespan before the event occured used for determining div spacing
						// figure out some schema
						$evntwdth = $eventwidth."%";
						//-- if the fact is a generic EVENt then get the qualifying TYPE
						if ($fact=="EVEN") {
							$fact = $val->getAttribute('TYPE');
						}
						$trans = WT_Gedcom_Tag::getLabel($fact);
						if (isset($eventinformation[$evntwdth])) {
							$eventinformation[$evntwdth] .= '<br>' . $trans . '<br>' . strip_tags($date->Display(false, '', NULL, false)) . ' ' . $val->getPlace()->getFullName();
						} else {
							$eventinformation[$evntwdth] = $fact . '-fact, ' . $trans . '<br>' . strip_tags($date->Display(false, '', NULL, false)) . ' ' . $val->getPlace()->getFullName();
						}
					}
				}

				$bdate=$value->getEstimatedBirthDate();
				$ddate=$value->getEstimatedDeathDate();
				if ($width > ($minlength +110)) {
					echo "<div id=\"bar_", $value->getXref(), "\" style=\"position: absolute; top:", $Y, "px; left:", $startPos, "px; width:", $width, "px; height:", $height, "px; background-color:", $this->color, "; border: solid blue 1px; z-index:$Z;\">";
					foreach ($eventinformation as $evtwidth=>$val) {
						echo "<div style=\"position:absolute; left:", $evtwidth, ";\"><a class=\"showit\" href=\"#\" style=\"top:-2px; font-size:10px;\"><b>";
						$text = explode("-fact, ", $val);
						$fact = $text[0];
						$val = $text[1];
						echo '</b><span>', self::getAbbreviation($fact), '</span></a></div>';
					}
					$indiName = $value->getFullName();
					echo '<table><tr><td width="15"><a class="showit" href="#"><b>';
					echo self::getAbbreviation('BIRT');
					echo '</b><span>', $value->getSexImage(), $indiName, '<br>', WT_Gedcom_Tag::getLabel('BIRT'), ' ', strip_tags($bdate->Display(false)), ' ', $value->getBirthPlace(), '</span></a>',
						'<td align="left" width="100%"><a href="', $value->getHtmlUrl(), '">', $value->getSexImage(), $indiName, '  ', $lifespan, ' </a></td>' ,
						'<td width="15">';
					if ($value->isDead()) {
						if ($deathReal || $value->isDead()) {
							echo '<a class="showit" href="#"><b>';
							echo self::getAbbreviation('DEAT');
							if (!$deathReal) echo '*';
							echo '</b><span>'.$value->getSexImage().$indiName.'<br>'.WT_Gedcom_Tag::getLabel('DEAT').' '.strip_tags($ddate->Display(false)).' '.$value->getDeathPlace().'</span></a>';
						}
					}
					echo '</td></tr></table>';
					echo '</div>';

				} else {
					if ($width > $minlength +5) {
						echo '<div style="text-align: left; position: absolute; top:', $Y, 'px; left:', $startPos, 'px; width:', $width, 'px; height:', $height, 'px; background-color:', $this->color, '; border: solid blue 1px; z-index:', $Z, '">';
						foreach ($eventinformation as $evtwidth=>$val) {
							echo '<div style="position:absolute; left:', $evtwidth, ' "><a class="showit" href="#" style="top:-2px; font-size:10px;"><b>';
							$text = explode("-fact,", $val);
							$fact = $text[0];
							$val = $text[1];
							echo '</b><span>'.self::getAbbreviation($fact).'</span></a></div>';
						}
						$indiName = $value->getFullName();
						echo '<table dir="ltr"><tr><td width="15"><a class="showit" href="#"><b>';
						echo self::getAbbreviation('BIRT');
						if (!$birthReal) echo '*';
						echo '</b><span>'.$value->getSexImage().$indiName.'<br>'.WT_Gedcom_Tag::getLabel('BIRT').' '.strip_tags($bdate->Display(false)).' '.$value->getBirthPlace().'</span></a></td>'.
						'<td align="left" width="100%"><a href="'.$value->getHtmlUrl().'">'.$value->getSexImage().$indiName.'</a></td>'.
						'<td width="15">';
						if ($value->isDead()) {
							if ($deathReal || $value->isDead()) {
								echo '<a class="showit" href="#"><b>';
								echo self::getAbbreviation('DEAT');
								if (!$deathReal) echo "*";
								echo '</b><span>'.$value->getSexImage().$indiName.'<br>'.WT_Gedcom_Tag::getLabel('DEAT').' '.strip_tags($ddate->Display(false)).' '.$value->getDeathPlace().'</span></a>';
							}
						}
						echo '</td></tr></table>';
						echo '</div>';
					} else {
						echo '<div style="text-align: left; position: absolute;top:', $Y, 'px; left:', $startPos, 'px;width:', $width, 'px; height:', $height, 'px; background-color:', $this->color, '; border: solid blue 1px; z-index:', $Z, '">';
						$indiName = $value->getFullName();
						echo '<a class="showit" href="'.$value->getHtmlUrl().'"><b>';
						echo self::getAbbreviation('BIRT');
						echo '</b><span>'.$value->getSexImage().$indiName.'<br>'.WT_Gedcom_Tag::getLabel('BIRT').' '.strip_tags($bdate->Display(false)).' '.$value->getBirthPlace().'<br>';
						foreach ($eventinformation as $evtwidth=>$val) {
							$text = explode('-fact,', $val);
							$val = $text[1];
							echo $val."<br>";
						}
						if ($value->isDead() && $deathReal) echo WT_Gedcom_Tag::getLabel('DEAT')." ".strip_tags($ddate->Display(false))." ".$value->getDeathPlace();
						echo '</span></a>';
						echo '</div>';
					}
				}
				$zindex--;

				if ($maxX < $startPos + $width)
					$maxX = $startPos + $width;
				if ($maxY < $Y) $maxY = $Y;
		}
		return $maxY;
	}

	public function getSignificantIndividual() {
		if ($this->people) {
			return $this->people[0];
		} else {
			return parent::getSignificantIndividual();
		}
	}

	// Search for people who had events in a given year range
	private static function search_indis_year_range($startyear, $endyear) {
		// TODO: We should use Julian-days, rather than gregorian years,
		// to allow the lifespan chart, etc., to use other calendars.
		$startjd=WT_Date_Gregorian::YMDtoJD($startyear, 1, 1);
		$endjd  =WT_Date_Gregorian::YMDtoJD($endyear+1, 1, 1)-1;

		$sql=
			"SELECT DISTINCT i_id AS xref, i_file AS gedcom_id, i_gedcom AS gedcom".
			" FROM `##individuals`".
			" JOIN `##dates` ON i_id=d_gid AND i_file=d_file".
			" WHERE i_file=? AND d_julianday1 BETWEEN ? AND ?";

		$rows=WT_DB::prepare($sql)
			->execute(array(WT_GED_ID, $startjd, $endjd))
			->fetchAll();

		$list=array();
		foreach ($rows as $row) {
			$list[]=WT_Individual::getInstance($row->xref, $row->gedcom_id, $row->gedcom);
		}
		return $list;
	}

	private static function getAbbreviation($tag) {
		switch ($tag) {
		case 'BIRT':  return WT_I18N::translate_c('Abbreviation for birth',            'b.');
		case 'MARR':  return WT_I18N::translate_c('Abbreviation for marriage',         'm.');
		case 'DEAT':  return WT_I18N::translate_c('Abbreviation for death',            'd.');
		default:      return utf8_substr(WT_Gedcom_Tag::getLabel($tag), 0, 1); // Just use the first letter of the full fact
		}
	}
}