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Diffstat (limited to 'config/dspam/pear/Image/Graph/Dataset/VectorFunction.php')
| -rw-r--r-- | config/dspam/pear/Image/Graph/Dataset/VectorFunction.php | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/config/dspam/pear/Image/Graph/Dataset/VectorFunction.php b/config/dspam/pear/Image/Graph/Dataset/VectorFunction.php new file mode 100644 index 00000000..4250bbc0 --- /dev/null +++ b/config/dspam/pear/Image/Graph/Dataset/VectorFunction.php @@ -0,0 +1,185 @@ +<?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(); + } + } + +} + +?>
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