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authorDaniel Stefan Haischt <dsh@pfsense.org>2006-07-27 01:32:35 +0000
committerDaniel Stefan Haischt <dsh@pfsense.org>2006-07-27 01:32:35 +0000
commit4427f59c63f88971deeaaa9809374df18d1eb288 (patch)
tree714b6c877eaa68ac244dae440254670363afc34a /packages/dspam/pear/Image/Graph/Dataset/VectorFunction.php
parent3c8397a8083a2d9e3838440e5b7f3d51705713ef (diff)
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- added missing PEAR Image dependency
Diffstat (limited to 'packages/dspam/pear/Image/Graph/Dataset/VectorFunction.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';
+
+/**
+ * Vector Function data set.
+ *
+ * Points are generated by calling 2 external functions, fx. x = sin(t) and y =
+ * cos(t)
+ *
+ * @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_VectorFunction extends Image_Graph_Dataset
+{
+
+ /**
+ * The name of the X function
+ * @var string
+ * @access private
+ */
+ var $_functionX;
+
+ /**
+ * The name of the Y function
+ * @var string
+ * @access private
+ */
+ var $_functionY;
+
+ /**
+ * The minimum of the vector function variable
+ * @var double
+ * @access private
+ */
+ var $_minimumT;
+
+ /**
+ * The maximum of the vector function variable
+ * @var double
+ * @access private
+ */
+ var $_maximumT;
+
+ /**
+ * Image_Graph_VectorFunctionDataset [Constructor]
+ *
+ * @param double $minimumT The minimum value of the vector function variable
+ * @param double $maximumT The maximum value of the vector function variable
+ * @param string $functionX The name of the X function, if must be a single
+ * parameter function like fx sin(x) or cos(x)
+ * @param string $functionY The name of the Y function, if must be a single
+ * parameter function like fx sin(x) or cos(x)
+ * @param int $points The number of points to create
+ */
+ function Image_Graph_Dataset_VectorFunction($minimumT, $maximumT, $functionX, $functionY, $points)
+ {
+ parent::Image_Graph_Dataset();
+ $this->_minimumT = $minimumT;
+ $this->_maximumT = $maximumT;
+ $this->_functionX = $functionX;
+ $this->_functionY = $functionY;
+ $this->_count = $points;
+ $this->_calculateMaxima();
+ }
+
+ /**
+ * Add a point to the 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 X point from the dataset
+ *
+ * @param var $x The variable to apply the X function to
+ * @return var The X function applied to the X value
+ * @access private
+ */
+ function _getPointX($x)
+ {
+ $functionX = $this->_functionX;
+ return $functionX ($x);
+ }
+
+ /**
+ * Gets a Y point from the dataset
+ *
+ * @param var $x The variable to apply the Y function to
+ * @return var The Y function applied to the X value
+ * @access private
+ */
+ function _getPointY($x)
+ {
+ $functionY = $this->_functionY;
+ return $functionY ($x);
+ }
+
+ /**
+ * Reset the intertal dataset pointer
+ *
+ * @return var The first T value
+ * @access private
+ */
+ function _reset()
+ {
+ $this->_posX = $this->_minimumT;
+ return $this->_posX;
+ }
+
+ /**
+ * The interval between 2 adjacent T values
+ *
+ * @return var The interval
+ * @access private
+ */
+ function _stepX()
+ {
+ return ($this->_maximumT - $this->_minimumT) / $this->count();
+ }
+
+ /**
+ * Calculates the X and Y extrema of the functions
+ *
+ * @access private
+ */
+ function _calculateMaxima()
+ {
+ $t = $this->_minimumT;
+ while ($t <= $this->_maximumT) {
+ $x = $this->_getPointX($t);
+ $y = $this->_getPointY($t);
+ $this->_minimumX = min($x, $this->_minimumX);
+ $this->_maximumX = max($x, $this->_maximumX);
+ $this->_minimumY = min($y, $this->_minimumY);
+ $this->_maximumY = max($y, $this->_maximumY);
+ $t += $this->_stepX();
+ }
+ }
+
+}
+
+?> \ No newline at end of file