103 lines
3.8 KiB
PHP
103 lines
3.8 KiB
PHP
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<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* Image_Graph - PEAR PHP OO Graph Rendering Utility.
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*
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* PHP versions 4 and 5
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*
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* LICENSE: This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version. This library is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
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* General Public License for more details. You should have received a copy of
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* the GNU Lesser General Public License along with this library; if not, write
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* to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*
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* @category Images
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* @package Image_Graph
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* @subpackage DataPreprocessor
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* @author Jesper Veggerby <pear.nosey@veggerby.dk>
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* @copyright Copyright (C) 2003, 2004 Jesper Veggerby Hansen
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* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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* @version CVS: $Id: Array.php,v 1.6 2005/08/24 20:35:59 nosey Exp $
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* @link http://pear.php.net/package/Image_Graph
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*/
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/**
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* Include file Image/Graph/DataPreprocessor.php
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*/
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require_once 'Image/Graph/DataPreprocessor.php';
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/**
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* Format data as looked up in an array.
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*
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* ArrayData is useful when a numercal value is to be translated to
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* something thats cannot directly be calculated from this value, this could for
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* example be a dataset meant to plot population of various countries. Since x-
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* values are numerical and they should really be country names, but there is no
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* linear correlation between the number and the name, we use an array to 'map'
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* the numbers to the name, i.e. $array[0] = 'Denmark'; $array[1] = 'Sweden';
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* ..., where the indexes are the numerical values from the dataset. This is NOT
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* usefull when the x-values are a large domain, i.e. to map unix timestamps to
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* date-strings for an x-axis. This is because the x-axis will selecte arbitrary
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* values for labels, which would in principle require the ArrayData to hold
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* values for every unix timestamp. However ArrayData can still be used to solve
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* such a situation, since one can use another value for X-data in the dataset
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* and then map this (smaller domain) value to a date. That is we for example
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* instead of using the unix-timestamp we use value 0 to represent the 1st date,
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* 1 to represent the next date, etc.
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*
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* @category Images
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* @package Image_Graph
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* @subpackage DataPreprocessor
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* @author Jesper Veggerby <pear.nosey@veggerby.dk>
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* @copyright Copyright (C) 2003, 2004 Jesper Veggerby Hansen
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* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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* @version Release: @package_version@
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* @link http://pear.php.net/package/Image_Graph
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*/
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class Image_Graph_DataPreprocessor_Array extends Image_Graph_DataPreprocessor
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{
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/**
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* The data label array
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* @var array
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* @access private
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*/
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var $_dataArray;
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/**
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* Image_Graph_ArrayData [Constructor].
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*
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* @param array $array The array to use as a lookup table
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*/
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function Image_Graph_DataPreprocessor_Array($array)
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{
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parent::Image_Graph_DataPreprocessor();
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$this->_dataArray = $array;
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}
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/**
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* Process the value
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*
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* @param var $value The value to process/format
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* @return string The processed value
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* @access private
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*/
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function _process($value)
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{
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if ((is_array($this->_dataArray)) && (isset ($this->_dataArray[$value]))) {
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return $this->_dataArray[$value];
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} else {
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return $value;
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}
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}
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}
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?>
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