1<?php 2 3/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */ 4 5/** 6 * Image_Graph - PEAR PHP OO Graph Rendering Utility. 7 * 8 * PHP version 5 9 * 10 * LICENSE: This library is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU Lesser General Public License as published by 12 * the Free Software Foundation; either version 2.1 of the License, or (at your 13 * option) any later version. This library is distributed in the hope that it 14 * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty 15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser 16 * General Public License for more details. You should have received a copy of 17 * the GNU Lesser General Public License along with this library; if not, write 18 * to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 19 * 02111-1307 USA 20 * 21 * @category Images 22 * @package Image_Graph 23 * @subpackage Plot 24 * @author Jesper Veggerby <pear.nosey@veggerby.dk> 25 * @author Stefan Neufeind <pear.neufeind@speedpartner.de> 26 * @copyright 2003-2009 The PHP Group 27 * @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1 28 * @version SVN: $Id: Line.php 291406 2009-11-29 00:54:22Z neufeind $ 29 * @link http://pear.php.net/package/Image_Graph 30 */ 31 32/** 33 * Include file Image/Graph/Plot.php 34 */ 35require_once 'Image/Graph/Plot.php'; 36 37/** 38 * Include file Image/Graph/Tool.php 39 */ 40require_once 'Image/Graph/Tool.php'; 41 42/** 43 * Fit the graph (to a line using linear regression). 44 * 45 * @category Images 46 * @package Image_Graph 47 * @subpackage Plot 48 * @author Jesper Veggerby <pear.nosey@veggerby.dk> 49 * @author Stefan Neufeind <pear.neufeind@speedpartner.de> 50 * @copyright 2003-2009 The PHP Group 51 * @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1 52 * @version Release: 0.8.0 53 * @link http://pear.php.net/package/Image_Graph 54 */ 55class Image_Graph_Plot_Fit_Line extends Image_Graph_Plot 56{ 57 58 /** 59 * Perform the actual drawing on the legend. 60 * 61 * @param int $x0 The top-left x-coordinate 62 * @param int $y0 The top-left y-coordinate 63 * @param int $x1 The bottom-right x-coordinate 64 * @param int $y1 The bottom-right y-coordinate 65 * 66 * @return void 67 * @access private 68 */ 69 function _drawLegendSample($x0, $y0, $x1, $y1) 70 { 71 $y = ($y0 + $y1) / 2; 72 $dy = abs($y1 - $y0) / 6; 73 $this->_canvas->addVertex(array('x' => $x0, 'y' => $y + $dy)); 74 $this->_canvas->addVertex(array('x' => $x1, 'y' => $y - $dy)); 75 $this->_canvas->polygon(array('connect' => false)); 76 } 77 78 /** 79 * Output the plot 80 * 81 * @return bool Was the output 'good' (true) or 'bad' (false). 82 * @access private 83 */ 84 function _done() 85 { 86 if (Image_Graph_Plot::_done() === false) { 87 return false; 88 } 89 90 $this->_canvas->startGroup(get_class($this) . '_' . $this->_title); 91 $this->_clip(true); 92 $keys = array_keys($this->_dataset); 93 foreach ($keys as $key) { 94 $dataset =& $this->_dataset[$key]; 95 $dataset->_reset(); 96 $data = array(); 97 while ($point = $dataset->_next()) { 98 $data[] = array( 99 'X' => $this->_pointX($point), 100 'Y' => $this->_pointY($point) 101 ); 102 } 103 104 $regression = Image_Graph_Tool::calculateLinearRegression($data); 105 $this->_getLineStyle($key); 106 $this->_canvas->line( 107 array( 108 'x0' => $this->_left, 109 'y0' => $this->_left * $regression['slope'] + $regression['intersection'], 110 'x1' => $this->_right, 111 'y1' => $this->_right * $regression['slope'] + $regression['intersection'] 112 ) 113 ); 114 } 115 $this->_clip(false); 116 $this->_canvas->endGroup(); 117 118 return true; 119 } 120} 121 122?> 123