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+<?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: $Id$
+ * @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);
+ }
+
+}
+
+?> \ No newline at end of file