GoogleChartDataSimpleEncoding.class.php

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00001 <?php
00002 /***************************************************************************
00003  *   Copyright (C) 2008 by Denis M. Gabaidulin                             *
00004  *                                                                         *
00005  *   This program is free software; you can redistribute it and/or modify  *
00006  *   it under the terms of the GNU Lesser General Public License as        *
00007  *   published by the Free Software Foundation; either version 3 of the    *
00008  *   License, or (at your option) any later version.                       *
00009  *                                                                         *
00010  ***************************************************************************/
00011 
00015     final class GoogleChartDataSimpleEncoding
00016         extends BaseGoogleChartDataEncoding
00017     {
00018         protected $name = 's:';
00019         
00020         private $encodingChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
00021         private $length = null;
00022         
00026         public static function create()
00027         {
00028             return new self;
00029         }
00030         
00031         public function __construct()
00032         {
00033             $this->length = strlen($this->encodingChars);
00034         }
00035         
00036         public function encode(GoogleChartDataSet $set)
00037         {
00038             $encodedString = null;
00039             
00040             foreach ($set->getData() as $dataElement) {
00041                 if ($dataElement >= 0)
00042                      $encodedString .=
00043                         $this->encodingChars[
00044                             round($this->length - 1)
00045                             * $dataElement
00046                             / $this->maxValue
00047                         ];
00048                 else
00049                     $encodedString .= '_';
00050             }
00051             
00052             return $encodedString;
00053         }
00054         
00055         public function toString()
00056         {
00057             return $this->name;
00058         }
00059     }
00060 ?>