Adding filter for Google's Annotated Timeline

lib/Haanga/lib/Haanga/Extension/Filter/Googlevizannotatedtimeline.php

+<?php
+
+class Haanga_Extension_Filter_GoogleVizAnnotatedTimeline{
+  public $is_safe = TRUE;
+  static function main($obj, $varname){
+  	$data = "";
+  	$i = 0;
+  	$j = 0;
+  	$firstColumn = true;
+    $options = array();
+  	$names = explode(",", $varname);
+
+  	$fieldCounter=0;
+  	$varList = array();
+  	foreach($names as $v){
+  	  if(strpos($v,"=")){
+  	    break;
+  	  }
+  	  
+  	  $columnType = 'number';
+
+  	  if($firstColumn){
+  	  	$columnType = 'date';
+  	  	$firstColumn = false;
+  	  }elseif(($fieldCounter - 2) %3 == 0 || ($fieldCounter - 3) %3 == 0){
+  	    $columnType = 'string';
+  	  }
+  	  array_push($varList, $v);
+  	  $data .= "        data.addColumn('".$columnType."', '".$v."');\n";
+  	  $fieldCounter++;
+  	}
+
+  	foreach($obj as $k){  	  
+  	  $j=0;
+  	  foreach($varList as $v){
+  	    $value = $k->$v->value;
+  	    if($j==0){
+  	      $value = "new Date(".date("Y, m, d", strtotime($k->$v->value)).")";
+  	    }elseif(($j - 2) %3 == 0 || ($j - 3) %3 == 0){
+  	      $value = "'".$k->$v->value."'";
+  	    }
+  	  	$data .="        data.setCell($i, $j, ".$value.");\n";
+  	  	$j++;
+  	  } 
+  	  $i++;
+  	}
+
+  	
+  	//Getting options
+  	$options['height'] = 400;
+  	$options['width'] = 400;
+  	$options['displayAnnotations'] = 'true';
+    for($z=$fieldCounter; $z < count($names); $z++){
+      $pair = explode("=", $names[$z]);
+      $key = trim($pair[0], "\" '");
+      $value = trim($pair[1], "\" '");
+      $options[$key] = $value;     
+    }
+
+  	$divId = uniqid("timeline_div");
+  	$pre = "<div id='".$divId."' style='width: 700px; height: 240px;'></div><script type='text/javascript' src='https://www.google.com/jsapi'></script>
+    <script type='text/javascript'>
+    var options_$divId = ".json_encode($options)."; 
+    google.load('visualization', '1', {packages:['annotatedtimeline']});
+    google.setOnLoadCallback(drawChart);
+    function drawChart() {
+    var data = new google.visualization.DataTable();
+    data.addRows(".$i.");\n
+".$data."    var timeline = new google.visualization.AnnotatedTimeLine(document.getElementById('".$divId."'));
+timeline.draw(data, options_$divId);
+    }
+    </script>";
+    return $pre;
+  }
+}