[Sommaire] [Imprimer]

   1  <?php
   2  
   3  /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
   4  
   5  /**
   6   * Image_Graph - PEAR PHP OO Graph Rendering Utility.
   7   *
   8   * PHP versions 4 and 5
   9   *
  10   * LICENSE: This library is free software; you can redistribute it and/or modify
  11   * it under the terms of the GNU Lesser General Public License as published by
  12   * the Free Software Foundation; either version 2.1 of the License, or (at your
  13   * option) any later version. This library is distributed in the hope that it
  14   * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  15   * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
  16   * General Public License for more details. You should have received a copy of
  17   * the GNU Lesser General Public License along with this library; if not, write
  18   * to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19   * 02111-1307 USA
  20   *
  21   * @category   Images
  22   * @package    Image_Graph
  23   * @subpackage DataSelector
  24   * @author     Jesper Veggerby <pear.nosey@veggerby.dk>
  25   * @copyright  Copyright (C) 2003, 2004 Jesper Veggerby Hansen
  26   * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
  27   * @version    CVS: $Id: EveryNthPoint.php,v 1.6 2005/08/24 20:35:59 nosey Exp $
  28   * @link       http://pear.php.net/package/Image_Graph
  29   */
  30  
  31  /**
  32   * Include file Image/Graph/DataSelector.php
  33   */
  34  require_once  'Image/Graph/DataSelector.php';
  35  
  36  /**
  37   * Filter out all points except every Nth point.
  38   *
  39   * Use this dataselector if you have a large number of datapoints, but only want to
  40   * show markers for a small number of them, say every 10th.
  41   *
  42   * @category   Images
  43   * @package    Image_Graph
  44   * @subpackage DataSelector
  45   * @author     Jesper Veggerby <pear.nosey@veggerby.dk>
  46   * @copyright  Copyright (C) 2003, 2004 Jesper Veggerby Hansen
  47   * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
  48   * @version    Release: 0.7.2
  49   * @link       http://pear.php.net/package/Image_Graph
  50   */
  51  class Image_Graph_DataSelector_EveryNthPoint extends Image_Graph_DataSelector
  52  {
  53  
  54      /**
  55       * The number of points checked
  56       * @var int
  57       * @access private
  58       */
  59      var $_pointNum = 0;
  60  
  61      /**
  62       * The number of points between every 'show', default: 10
  63       * @var int
  64       * @access private
  65       */
  66      var $_pointInterval = 10;
  67  
  68      /**
  69       * EvertNthPoint [Constructor]
  70       *
  71       * @param int $pointInterval The number of points between every 'show',
  72       *   default: 10
  73       */
  74      function Image_Graph_DataSelector_EveryNthpoint($pointInterval = 10)
  75      {
  76          parent::Image_Graph_DataSelector();
  77          $this->_pointInterval = $pointInterval;
  78      }
  79  
  80      /**
  81       * Check if a specified value should be 'selected', ie shown as a marker
  82       *
  83       * @param array $values The values to check
  84       * @return bool True if the Values should cause a marker to be shown,
  85       *   false if not
  86       * @access private
  87       */
  88      function _select($values)
  89      {
  90          $oldPointNum = $this->_pointNum;
  91          $this->_pointNum++;
  92          return (($oldPointNum % $this->_pointInterval) == 0);
  93      }
  94  
  95  }
  96  
  97  ?>