117 lines
3.8 KiB
PHP
117 lines
3.8 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* Image_Graph - PEAR PHP OO Graph Rendering Utility.
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*
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* PHP versions 4 and 5
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*
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* LICENSE: This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version. This library is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
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* General Public License for more details. You should have received a copy of
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* the GNU Lesser General Public License along with this library; if not, write
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* to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*
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* @category Images
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* @package Image_Graph
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* @subpackage Plot
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* @author Jesper Veggerby <pear.nosey@veggerby.dk>
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* @copyright Copyright (C) 2003, 2004 Jesper Veggerby Hansen
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* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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* @version CVS: $Id: Line.php,v 1.1 2005/09/14 20:27:25 nosey Exp $
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* @link http://pear.php.net/package/Image_Graph
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*/
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/**
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* Include file Image/Graph/Plot.php
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*/
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require_once 'Image/Graph/Plot.php';
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/**
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* Include file Image/Graph/Tool.php
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*/
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require_once 'Image/Graph/Tool.php';
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/**
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* Fit the graph (to a line using linear regression).
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*
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* @category Images
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* @package Image_Graph
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* @subpackage Plot
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* @author Jesper Veggerby <pear.nosey@veggerby.dk>
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* @copyright Copyright (C) 2003, 2004 Jesper Veggerby Hansen
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* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
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* @version Release: @package_version@
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* @link http://pear.php.net/package/Image_Graph
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*/
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class Image_Graph_Plot_Fit_Line extends Image_Graph_Plot
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{
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/**
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* Perform the actual drawing on the legend.
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*
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* @param int $x0 The top-left x-coordinate
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* @param int $y0 The top-left y-coordinate
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* @param int $x1 The bottom-right x-coordinate
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* @param int $y1 The bottom-right y-coordinate
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* @access private
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*/
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function _drawLegendSample($x0, $y0, $x1, $y1)
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{
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$y = ($y0 + $y1) / 2;
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$dy = abs($y1 - $y0) / 6;
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$this->_canvas->addVertex(array('x' => $x0, 'y' => $y + $dy));
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$this->_canvas->addVertex(array('x' => $x1, 'y' => $y - $dy));
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$this->_canvas->polygon(array('connect' => false));
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}
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/**
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* Output the plot
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*
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* @return bool Was the output 'good' (true) or 'bad' (false).
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* @access private
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*/
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function _done()
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{
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if (Image_Graph_Plot::_done() === false) {
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return false;
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}
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$this->_canvas->startGroup(get_class($this) . '_' . $this->_title);
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$keys = array_keys($this->_dataset);
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foreach ($keys as $key) {
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$dataset =& $this->_dataset[$key];
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$dataset->_reset();
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$data = array();
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while ($point = $dataset->_next()) {
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$data[] = array(
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'X' => $this->_pointX($point),
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'Y' => $this->_pointY($point)
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);
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}
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$regression = Image_Graph_Tool::calculateLinearRegression($data);
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$this->_getLineStyle($key);
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$this->_canvas->line(
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array(
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'x0' => $this->_left,
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'y0' => $this->_left * $regression['slope'] + $regression['intersection'],
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'x1' => $this->_right,
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'y1' => $this->_right * $regression['slope'] + $regression['intersection']
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)
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);
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}
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$this->_canvas->endGroup();
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return true;
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}
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}
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?>
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