1 files changed, 118 insertions, 0 deletions
diff --git a/config/dspam/pear/Image/Graph/Plot/Fit/Line.php b/config/dspam/pear/Image/Graph/Plot/Fit/Line.php
new file mode 100644
index 00000000..07f3b9cc
--- /dev/null
+++ b/config/dspam/pear/Image/Graph/Plot/Fit/Line.php
@@ -0,0 +1,118 @@
+<?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 Plot
+ * @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/Plot.php
+ */
+require_once 'Image/Graph/Plot.php';
+
+/**
+ * Include file Image/Graph/Tool.php
+ */
+require_once 'Image/Graph/Tool.php';
+
+/**
+ * Fit the graph (to a line using linear regression).
+ *
+ * @category   Images
+ * @package    Image_Graph
+ * @subpackage Plot
+ * @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_Plot_Fit_Line extends Image_Graph_Plot
+{
+
+    /**
+     * Perform the actual drawing on the legend.
+     *
+     * @param int $x0 The top-left x-coordinate
+     * @param int $y0 The top-left y-coordinate
+     * @param int $x1 The bottom-right x-coordinate
+     * @param int $y1 The bottom-right y-coordinate
+     * @access private
+     */
+    function _drawLegendSample($x0, $y0, $x1, $y1)
+    {
+        $y = ($y0 + $y1) / 2;
+        $dy = abs($y1 - $y0) / 6;
+        $this->_canvas->addVertex(array('x' => $x0, 'y' => $y + $dy));
+        $this->_canvas->addVertex(array('x' => $x1, 'y' => $y - $dy));
+        $this->_canvas->polygon(array('connect' => false));
+    }
+    
+    /**
+     * Output the plot
+     *
+     * @return bool Was the output 'good' (true) or 'bad' (false).
+     * @access private
+     */
+    function _done()
+    {
+        if (Image_Graph_Plot::_done() === false) {
+            return false;
+        }
+
+        $this->_canvas->startGroup(get_class($this) . '_' . $this->_title);
+        $this->_clip(true);
+        $keys = array_keys($this->_dataset);
+        foreach ($keys as $key) {
+            $dataset =& $this->_dataset[$key];
+            $dataset->_reset();
+            $data = array();
+            while ($point = $dataset->_next()) {
+                $data[] = array(
+                    'X' => $this->_pointX($point),
+                    'Y' => $this->_pointY($point)
+                );
+            }
+
+            $regression = Image_Graph_Tool::calculateLinearRegression($data);
+            $this->_getLineStyle($key);
+            $this->_canvas->line(
+                array(
+                    'x0' => $this->_left,
+                    'y0' => $this->_left * $regression['slope'] + $regression['intersection'],
+                    'x1' => $this->_right,
+                    'y1' => $this->_right * $regression['slope'] + $regression['intersection']
+                )
+            );
+        }
+        $this->_clip(false);
+        $this->_canvas->endGroup();
+        
+        return true;
+    }
+}
+
+?>