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authorChris Buechler <cmb@pfsense.org>2011-01-25 05:20:28 -0500
committerChris Buechler <cmb@pfsense.org>2011-01-25 05:21:06 -0500
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treebba85a3958c7c11a8ce0bc8d6b0addad3a24c2f1 /config/archive/dspam/pear/Image/Graph/Dataset/Function.php
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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 Dataset
+ * @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/Dataset.php
+ */
+require_once 'Image/Graph/Dataset.php';
+
+/**
+ * Function data set, points are generated by calling an external function.
+ *
+ * The function must be a single variable function and return a the result,
+ * builtin functions that are fx sin() or cos(). User defined function can be
+ * used if they are such, i.e: function myFunction($variable)
+ *
+ * @category Images
+ * @package Image_Graph
+ * @subpackage Dataset
+ * @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_Dataset_Function extends Image_Graph_Dataset
+{
+
+ /**
+ * The name of the function
+ * @var string
+ * @access private
+ */
+ var $_dataFunction;
+
+ /**
+ * Image_Graph_FunctionDataset [Constructor]
+ *
+ * @param double $minimumX The minimum X value
+ * @param double $maximumX The maximum X value
+ * @param string $function The name of the function, if must be a single
+ * parameter function like fx sin(x) or cos(x)
+ * @param int $points The number of points to create
+ */
+ function Image_Graph_Dataset_Function($minimumX, $maximumX, $function, $points)
+ {
+ parent::Image_Graph_Dataset();
+ $this->_minimumX = $minimumX;
+ $this->_maximumX = $maximumX;
+ $this->_dataFunction = $function;
+ $this->_count = $points;
+ $this->_calculateMaxima();
+ }
+
+ /**
+ * Add a point to the dataset.
+ *
+ * You can't add points to a function dataset
+ *
+ * @param int $x The X value to add
+ * @param int $y The Y value to add, can be omited
+ * @param var $ID The ID of the point
+ */
+ function addPoint($x, $y = false, $ID = false)
+ {
+ }
+
+ /**
+ * Gets a Y point from the dataset
+ *
+ * @param var $x The variable to apply the function to
+ * @return var The function applied to the X value
+ * @access private
+ */
+ function _getPointY($x)
+ {
+ $function = $this->_dataFunction;
+ return $function ($x);
+ }
+
+ /**
+ * The number of values in the dataset
+ *
+ * @return int The number of values in the dataset
+ * @access private
+ */
+ function _count()
+ {
+ return $this->_count;
+ }
+
+ /**
+ * The interval between 2 adjacent Y values
+ *
+ * @return var The interval
+ * @access private
+ */
+ function _stepX()
+ {
+ return ($this->_maximumX - $this->_minimumX) / $this->_count();
+ }
+
+ /**
+ * Calculates the Y extrema of the function
+ *
+ * @access private
+ */
+ function _calculateMaxima()
+ {
+ $x = $this->_minimumX;
+ while ($x <= $this->_maximumX) {
+ $y = $this->_getPointY($x);
+ $this->_minimumY = min($y, $this->_minimumY);
+ $this->_maximumY = max($y, $this->_maximumY);
+ $x += $this->_stepX();
+ }
+ }
+
+}
+
+?> \ No newline at end of file