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khosb/includes/pear/Image/Graph/Plot/Smoothed/Bezier.php

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<?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: Bezier.php,v 1.8 2005/08/24 20:36:02 nosey Exp $
* @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';
/**
* Bezier smoothed plottype.
*
* The framework for calculating the Bezier smoothed curve from the dataset.
* Used in {@link Image_Graph_Plot_Smoothed_Line} and {@link
* Image_Graph_Plot_Smoothed_Area}. Smoothed charts are only supported with non-
* stacked types
* @link http://homepages.borland.com/efg2lab/Graphics/Jean-
* YvesQueinecBezierCurves.htm efg computer lab - description of bezier curves
*
* @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
* @abstract
*/
class Image_Graph_Plot_Smoothed_Bezier extends Image_Graph_Plot
{
/**
* Image_Graph_Plot_Smoothed_Bezier [Constructor]
*
* Only 'normal' multitype supported
*
* @param Dataset $dataset The data set (value containter) to plot
* @param string $title The title of the plot (used for legends, {@link
* Image_Graph_Legend})
*/
function Image_Graph_Plot_Smoothed_Bezier(& $dataset, $title = '')
{
parent::Image_Graph_Plot($dataset, 'normal', $title);
}
/**
* Return the minimum Y point
*
* @return double The minumum Y point
* @access private
*/
function _minimumY()
{
return 1.05 * parent::_minimumY();
}
/**
* Return the maximum Y point
*
* @return double The maximum Y point
* @access private
*/
function _maximumY()
{
return 1.05 * parent::_maximumY();
}
/**
* Calculates all Bezier points, for the curve
*
* @param array $p1 The actual point to calculate control points for
* @param array $p0 The point "just before" $p1
* @param array $p2 The point "just after" $p1
* @param array $p3 The point "just after" $p2
* @return array Array of Bezier points
* @access private
*/
function _getControlPoints($p1, $p0, $p2, $p3)
{
$p1 = $this->_pointXY($p1);
if ($p2) {
$p2 = $this->_pointXY($p2);
}
if (!$p0) {
$p0['X'] = $p1['X'] - abs($p2['X'] - $p1['X']);
$p0['Y'] = $p1['Y']; //-($p2['Y']-$p1['Y']);
} else {
$p0 = $this->_pointXY($p0);
}
if (!$p3) {
$p3['X'] = $p1['X'] + 2*abs($p1['X'] - $p0['X']);
$p3['Y'] = $p1['Y'];
} else {
$p3 = $this->_pointXY($p3);
}
if (!$p2) {
$p2['X'] = $p1['X'] + abs($p1['X'] - $p0['X']);
$p2['Y'] = $p1['Y'];
}
$pC1['X'] = Image_Graph_Tool::controlPoint($p0['X'], $p1['X'], $p2['X']);
$pC1['Y'] = Image_Graph_Tool::controlPoint($p0['Y'], $p1['Y'], $p2['Y']);
$pC2['X'] = Image_Graph_Tool::controlPoint($p3['X'], $p2['X'], $p1['X']);
$pC2['Y'] = Image_Graph_Tool::controlPoint($p3['Y'], $p2['Y'], $p1['Y']);
return array(
'X' => $p1['X'],
'Y' => $p1['Y'],
'P1X' => $pC1['X'],
'P1Y' => $pC1['Y'],
'P2X' => $pC2['X'],
'P2Y' => $pC2['Y']
);
}
/**
* Create legend sample data for the canvas.
*
* Common for all smoothed plots
*
* @access private
*/
function _addSamplePoints($x0, $y0, $x1, $y1)
{
$p = abs($x1 - $x0);
$cy = ($y0 + $y1) / 2;
$h = abs($y1 - $y0);
$dy = $h / 4;
$dw = abs($x1 - $x0) / $p;
for ($i = 0; $i < $p; $i++) {
$v = 2 * pi() * $i / $p;
$x = $x0 + $i * $dw;
$y = $cy + 2 * $v * sin($v);
$this->_canvas->addVertex(array('x' => $x, 'y' => $y));
}
}
}
?>