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-rw-r--r--packages/dspam/pear/Image/Graph/Dataset/Function.php147
-rw-r--r--packages/dspam/pear/Image/Graph/Dataset/Random.php77
-rw-r--r--packages/dspam/pear/Image/Graph/Dataset/Sequential.php114
-rw-r--r--packages/dspam/pear/Image/Graph/Dataset/Trivial.php260
-rw-r--r--packages/dspam/pear/Image/Graph/Dataset/VectorFunction.php185
5 files changed, 783 insertions, 0 deletions
diff --git a/packages/dspam/pear/Image/Graph/Dataset/Function.php b/packages/dspam/pear/Image/Graph/Dataset/Function.php
new file mode 100644
index 00000000..08174b1d
--- /dev/null
+++ b/packages/dspam/pear/Image/Graph/Dataset/Function.php
@@ -0,0 +1,147 @@
+<?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
diff --git a/packages/dspam/pear/Image/Graph/Dataset/Random.php b/packages/dspam/pear/Image/Graph/Dataset/Random.php
new file mode 100644
index 00000000..0b2d7c68
--- /dev/null
+++ b/packages/dspam/pear/Image/Graph/Dataset/Random.php
@@ -0,0 +1,77 @@
+<?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/Trivial.php
+ */
+require_once 'Image/Graph/Dataset/Trivial.php';
+
+/**
+ * Random data set, points are generated by random.
+ *
+ * This dataset is mostly (if not solely) used for demo-purposes.
+ *
+ * @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_Random extends Image_Graph_Dataset_Trivial
+{
+
+ /**
+ * RandomDataset [Constructor]
+ *
+ * @param int $count The number of points to create
+ * @param double $minimum The minimum value the random set can be
+ * @param double $maximum The maximum value the random set can be
+ * @param bool $includeZero Whether 0 should be included or not as an X
+ * value, may be omitted, default: false</false>
+ */
+ function Image_Graph_Dataset_Random($count, $minimum, $maximum, $includeZero = false)
+ {
+ parent::Image_Graph_Dataset_Trivial();
+ $i = 0;
+ while ($i < $count) {
+ $this->addPoint(
+ $ixc = ($includeZero ? $i : $i +1),
+ rand($minimum, $maximum)
+ );
+ $i ++;
+ }
+ }
+
+}
+
+?> \ No newline at end of file
diff --git a/packages/dspam/pear/Image/Graph/Dataset/Sequential.php b/packages/dspam/pear/Image/Graph/Dataset/Sequential.php
new file mode 100644
index 00000000..2605c409
--- /dev/null
+++ b/packages/dspam/pear/Image/Graph/Dataset/Sequential.php
@@ -0,0 +1,114 @@
+<?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/Trivial.php
+ */
+require_once 'Image/Graph/Dataset/Trivial.php';
+
+/**
+ * Sequential data set, simply add points (y) 1 by 1.
+ *
+ * This is a single point (1D) dataset, all points are of the type (0, y1), (1,
+ * y2), (2, y3)... Where the X-value is implicitly incremented. This is useful
+ * for example for barcharts, where you could fx. use an {@link
+ * Image_Graph_Dataset_Array} datapreprocessor to make sence of the x-values.
+ *
+ * @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_Sequential extends Image_Graph_Dataset_Trivial
+{
+
+ /**
+ * Image_Graph_SequentialDataset [Constructor]
+ */
+ function Image_Graph_Dataset_Sequential($dataArray = false)
+ {
+ parent::Image_Graph_Dataset_Trivial();
+ if (is_array($dataArray)) {
+ reset($dataArray);
+ foreach ($dataArray as $value) {
+ $this->addPoint($value);
+ }
+ }
+ }
+
+ /**
+ * Add a point to the dataset
+ *
+ * @param int $y The Y value to add, can be omited
+ * @param var $ID The ID of the point
+ */
+ function addPoint($y, $ID = false)
+ {
+ parent::addPoint($this->count(), $y);
+ }
+
+ /**
+ * Gets a X point from the dataset
+ *
+ * @param var $x The variable to return an X value from, fx in a
+ * vector function data set
+ * @return var The X value of the variable
+ * @access private
+ */
+ function _getPointX($x)
+ {
+ return ((int) $x);
+ }
+
+ /**
+ * The minimum X value
+ * @return var The minimum X value
+ */
+ function minimumX()
+ {
+ return 0;
+ }
+
+ /**
+ * The maximum X value
+ * @return var The maximum X value
+ */
+ function maximumX()
+ {
+ return $this->count();
+ }
+
+}
+
+?> \ No newline at end of file
diff --git a/packages/dspam/pear/Image/Graph/Dataset/Trivial.php b/packages/dspam/pear/Image/Graph/Dataset/Trivial.php
new file mode 100644
index 00000000..84af1c4b
--- /dev/null
+++ b/packages/dspam/pear/Image/Graph/Dataset/Trivial.php
@@ -0,0 +1,260 @@
+<?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';
+
+/**
+ * Trivial data set, simply add points (x, y) 1 by 1
+ *
+ * @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_Trivial extends Image_Graph_Dataset
+{
+
+ /**
+ * Data storage
+ * @var array
+ * @access private
+ */
+ var $_data;
+
+ /**
+ * Image_Graph_Dataset_Trivial [Constructor]
+ *
+ * Pass an associated array ($data[$x] = $y) to the constructor for easy
+ * data addition. Alternatively (if multiple entries with same x value is
+ * required) pass an array with (x, y) values: $data[$id] = array('x' => $x,
+ * 'y' => $y);
+ *
+ * NB! If passing the 1st type array at this point, the x-values will also
+ * be used for ID tags, i.e. when using {@link Image_Graph_Fill_Array}. In
+ * the 2nd type the key/index of the "outermost" array will be the id tag
+ * (i.e. $id in the example)
+ *
+ * @param array $dataArray An associated array with values to the dataset
+ */
+ function Image_Graph_Dataset_Trivial($dataArray = false)
+ {
+ parent::Image_Graph_Dataset();
+ $this->_data = array ();
+ if (is_array($dataArray)) {
+ reset($dataArray);
+ $keys = array_keys($dataArray);
+ foreach ($keys as $x) {
+ $y =& $dataArray[$x];
+ if ((is_array($y)) && (isset($y['x'])) && (isset($y['y']))) {
+ $this->addPoint($y['x'], $y['y'], (isset($y['id']) ? $y['id'] : $x));
+ } else {
+ $this->addPoint($x, $y, $x);
+ }
+ }
+ }
+ }
+
+ /**
+ * Add a point to the dataset
+ *
+ * $ID can contain either the ID of the point, i.e. 'DK', 123, 'George', etc. or it can contain
+ * values used for creation of the HTML image map. This is achieved using is an an associated array
+ * with the following values:
+ *
+ * 'url' The URL to create the link to
+ *
+ * 'alt' [optional] The alt text on the link
+ *
+ * 'target' [optional] The target of the link
+ *
+ * 'htmltags' [optional] An associated array with html tags (tag as key), fx. 'onMouseOver' => 'history.go(-1);', 'id' => 'thelink'
+ *
+ * @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, $ID = false)
+ {
+ parent::addPoint($x, $y, $ID);
+
+ if (is_array($ID)) {
+ $data = $ID;
+ $ID = (isset($data['id']) ? $data['id'] : false);
+ } else {
+ $data = false;
+ }
+
+ $this->_data[] = array ('X' => $x, 'Y' => $y, 'ID' => $ID, 'data' => $data);
+ if (!is_numeric($x)) {
+ $this->_maximumX = count($this->_data);
+ }
+ }
+
+ /**
+ * The first point
+ *
+ * @return array The last point
+ */
+ function first()
+ {
+ reset($this->_data);
+ return current($this->_data);
+ }
+
+ /**
+ * The last point
+ *
+ * @return array The first point
+ */
+ function last()
+ {
+ return end($this->_data);
+ }
+
+ /**
+ * Gets a X point from the dataset
+ *
+ * @param var $x The variable to return an X value from, fx in a
+ * vector function data set
+ * @return var The X value of the variable
+ * @access private
+ */
+ function _getPointX($x)
+ {
+ if (isset($this->_data[$x])) {
+ return $this->_data[$x]['X'];
+ } else {
+ return false;
+ }
+ }
+
+ /**
+ * Gets a Y point from the dataset
+ *
+ * @param var $x The variable to return an Y value from, fx in a
+ * vector function data set
+ * @return var The Y value of the variable
+ * @access private
+ */
+ function _getPointY($x)
+ {
+ if (isset($this->_data[$x])) {
+ return $this->_data[$x]['Y'];
+ } else {
+ return false;
+ }
+ }
+
+ /**
+ * Gets a ID from the dataset
+ *
+ * @param var $x The variable to return an Y value from, fx in a
+ * vector function data set
+ * @return var The ID value of the variable
+ * @access private
+ */
+ function _getPointID($x)
+ {
+ if (isset($this->_data[$x])) {
+ return $this->_data[$x]['ID'];
+ } else {
+ return false;
+ }
+ }
+
+ /**
+ * Gets point data from the dataset
+ *
+ * @param var $x The variable to return an Y value from, fx in a vector
+ * function data set
+ * @return array The data for the point
+ * @access private
+ */
+ function _getPointData($x)
+ {
+ if (isset($this->_data[$x])) {
+ return $this->_data[$x]['data'];
+ } else {
+ return false;
+ }
+ }
+
+ /**
+ * The number of values in the dataset
+ *
+ * @return int The number of values in the dataset
+ */
+ function count()
+ {
+ return count($this->_data);
+ }
+
+ /**
+ * Reset the intertal dataset pointer
+ *
+ * @return var The first X value
+ * @access private
+ */
+ function _reset()
+ {
+ $this->_posX = 0;
+ return $this->_posX;
+ }
+
+ /**
+ * Get the next point the internal pointer refers to and advance the pointer
+ *
+ * @return array The next point
+ * @access private
+ */
+ function _next()
+ {
+ if ($this->_posX >= $this->count()) {
+ return false;
+ }
+ $x = $this->_getPointX($this->_posX);
+ $y = $this->_getPointY($this->_posX);
+ $ID = $this->_getPointID($this->_posX);
+ $data = $this->_getPointData($this->_posX);
+ $this->_posX += $this->_stepX();
+
+ return array('X' => $x, 'Y' => $y, 'ID' => $ID, 'data' => $data);
+ }
+
+}
+
+?> \ No newline at end of file
diff --git a/packages/dspam/pear/Image/Graph/Dataset/VectorFunction.php b/packages/dspam/pear/Image/Graph/Dataset/VectorFunction.php
new file mode 100644
index 00000000..4250bbc0
--- /dev/null
+++ b/packages/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();
+ }
+ }
+
+}
+
+?> \ No newline at end of file