97 lines
3.0 KiB
PHP
97 lines
3.0 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 DataSelector
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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: EveryNthPoint.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/DataSelector.php
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*/
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require_once 'Image/Graph/DataSelector.php';
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/**
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* Filter out all points except every Nth point.
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*
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* Use this dataselector if you have a large number of datapoints, but only want to
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* show markers for a small number of them, say every 10th.
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*
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* @category Images
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* @package Image_Graph
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* @subpackage DataSelector
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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_DataSelector_EveryNthPoint extends Image_Graph_DataSelector
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{
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/**
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* The number of points checked
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* @var int
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* @access private
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*/
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var $_pointNum = 0;
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/**
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* The number of points between every 'show', default: 10
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* @var int
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* @access private
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*/
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var $_pointInterval = 10;
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/**
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* EvertNthPoint [Constructor]
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*
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* @param int $pointInterval The number of points between every 'show',
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* default: 10
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*/
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function Image_Graph_DataSelector_EveryNthpoint($pointInterval = 10)
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{
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parent::Image_Graph_DataSelector();
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$this->_pointInterval = $pointInterval;
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}
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/**
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* Check if a specified value should be 'selected', ie shown as a marker
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*
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* @param array $values The values to check
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* @return bool True if the Values should cause a marker to be shown,
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* false if not
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* @access private
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*/
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function _select($values)
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{
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$oldPointNum = $this->_pointNum;
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$this->_pointNum++;
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return (($oldPointNum % $this->_pointInterval) == 0);
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}
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}
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?>
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