This repository has been archived on 2024-04-08. You can view files and clone it, but cannot push or open issues or pull requests.
khosb/includes/pear/Image/Graph/DataSelector/EveryNthPoint.php

97 lines
3.1 KiB
PHP
Raw Normal View History

<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* Image_Graph - PEAR PHP OO Graph Rendering Utility.
*
* PHP versions 4 and 5
*
* LICENSE: This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version. This library 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 Lesser
* General Public License for more details. You should have received a copy of
* the GNU Lesser General Public License along with this library; if not, write
* to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*
* @category Images
* @package Image_Graph
* @subpackage DataSelector
* @author Jesper Veggerby <pear.nosey@veggerby.dk>
* @copyright Copyright (C) 2003, 2004 Jesper Veggerby Hansen
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
* @version CVS: $Id: EveryNthPoint.php,v 1.6 2005/08/24 20:35:59 nosey Exp $
* @link http://pear.php.net/package/Image_Graph
*/
/**
* Include file Image/Graph/DataSelector.php
*/
require_once 'Image/Graph/DataSelector.php';
/**
* Filter out all points except every Nth point.
*
* Use this dataselector if you have a large number of datapoints, but only want to
* show markers for a small number of them, say every 10th.
*
* @category Images
* @package Image_Graph
* @subpackage DataSelector
* @author Jesper Veggerby <pear.nosey@veggerby.dk>
* @copyright Copyright (C) 2003, 2004 Jesper Veggerby Hansen
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
* @version Release: @package_version@
* @link http://pear.php.net/package/Image_Graph
*/
class Image_Graph_DataSelector_EveryNthPoint extends Image_Graph_DataSelector
{
/**
* The number of points checked
* @var int
* @access private
*/
var $_pointNum = 0;
/**
* The number of points between every 'show', default: 10
* @var int
* @access private
*/
var $_pointInterval = 10;
/**
* EvertNthPoint [Constructor]
*
* @param int $pointInterval The number of points between every 'show',
* default: 10
*/
function Image_Graph_DataSelector_EveryNthpoint($pointInterval = 10)
{
parent::Image_Graph_DataSelector();
$this->_pointInterval = $pointInterval;
}
/**
* Check if a specified value should be 'selected', ie shown as a marker
*
* @param array $values The values to check
* @return bool True if the Values should cause a marker to be shown,
* false if not
* @access private
*/
function _select($values)
{
$oldPointNum = $this->_pointNum;
$this->_pointNum++;
return (($oldPointNum % $this->_pointInterval) == 0);
}
}
?>