[Sommaire] [Imprimer]

   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 versions 4 and 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   * @copyright  Copyright (C) 2003, 2004 Jesper Veggerby Hansen
  26   * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
  27   * @version    CVS: $Id: Bezier.php,v 1.8 2005/08/24 20:36:02 nosey Exp $
  28   * @link       http://pear.php.net/package/Image_Graph
  29   */
  30  
  31  /**
  32   * Include file Image/Graph/Plot.php
  33   */
  34  require_once  'Image/Graph/Plot.php';
  35  
  36  /**
  37   * Include file Image/Graph/Tool.php
  38   */
  39  require_once  'Image/Graph/Tool.php';
  40  
  41  /**
  42   * Bezier smoothed plottype.
  43   *
  44   * The framework for calculating the Bezier smoothed curve from the dataset.
  45   * Used in {@link Image_Graph_Plot_Smoothed_Line} and {@link
  46   * Image_Graph_Plot_Smoothed_Area}. Smoothed charts are only supported with non-
  47   * stacked types
  48   * @link http://homepages.borland.com/efg2lab/Graphics/Jean-
  49   * YvesQueinecBezierCurves.htm efg computer lab - description of bezier curves
  50   *
  51   * @category   Images
  52   * @package    Image_Graph
  53   * @subpackage Plot
  54   * @author     Jesper Veggerby <pear.nosey@veggerby.dk>
  55   * @copyright  Copyright (C) 2003, 2004 Jesper Veggerby Hansen
  56   * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
  57   * @version    Release: 0.7.2
  58   * @link       http://pear.php.net/package/Image_Graph
  59   * @abstract
  60   */
  61  class Image_Graph_Plot_Smoothed_Bezier extends Image_Graph_Plot
  62  {
  63  
  64      /**
  65       * Image_Graph_Plot_Smoothed_Bezier [Constructor]
  66       *
  67       * Only 'normal' multitype supported
  68       *
  69       * @param Dataset $dataset The data set (value containter) to plot
  70       * @param string $title The title of the plot (used for legends, {@link
  71       *   Image_Graph_Legend})
  72       */
  73      function Image_Graph_Plot_Smoothed_Bezier(& $dataset, $title = '')
  74      {
  75          parent::Image_Graph_Plot($dataset, 'normal', $title);
  76      }
  77  
  78      /**
  79       * Return the minimum Y point
  80       *
  81       * @return double The minumum Y point
  82       * @access private
  83       */
  84      function _minimumY()
  85      {
  86          return 1.05 * parent::_minimumY();
  87      }
  88  
  89      /**
  90       * Return the maximum Y point
  91       *
  92       * @return double The maximum Y point
  93       * @access private
  94       */
  95      function _maximumY()
  96      {
  97          return 1.05 * parent::_maximumY();
  98      }
  99  
 100      /**
 101       * Calculates all Bezier points, for the curve
 102       *
 103       * @param array $p1 The actual point to calculate control points for
 104       * @param array $p0 The point "just before" $p1
 105       * @param array $p2 The point "just after" $p1
 106       * @param array $p3 The point "just after" $p2
 107       * @return array Array of Bezier points
 108       * @access private
 109       */
 110      function _getControlPoints($p1, $p0, $p2, $p3)
 111      {
 112          $p1 = $this->_pointXY($p1);
 113          if ($p2) {
 114              $p2 = $this->_pointXY($p2);
 115          }
 116          if (!$p0) {
 117              $p0['X'] = $p1['X'] - abs($p2['X'] - $p1['X']);
 118              $p0['Y'] = $p1['Y']; //-($p2['Y']-$p1['Y']);
 119          } else {
 120              $p0 = $this->_pointXY($p0);
 121          }
 122          if (!$p3) {
 123              $p3['X'] = $p1['X'] + 2*abs($p1['X'] - $p0['X']);
 124              $p3['Y'] = $p1['Y'];
 125          } else {
 126              $p3 = $this->_pointXY($p3);
 127          }
 128  
 129          if (!$p2) {
 130              $p2['X'] = $p1['X'] + abs($p1['X'] - $p0['X']);
 131              $p2['Y'] = $p1['Y'];
 132          }
 133  
 134          $pC1['X'] = Image_Graph_Tool::controlPoint($p0['X'], $p1['X'], $p2['X']);
 135          $pC1['Y'] = Image_Graph_Tool::controlPoint($p0['Y'], $p1['Y'], $p2['Y']);
 136          $pC2['X'] = Image_Graph_Tool::controlPoint($p3['X'], $p2['X'], $p1['X']);
 137          $pC2['Y'] = Image_Graph_Tool::controlPoint($p3['Y'], $p2['Y'], $p1['Y']);
 138  
 139          return array(
 140              'X' => $p1['X'],
 141              'Y' => $p1['Y'],
 142              'P1X' => $pC1['X'],
 143              'P1Y' => $pC1['Y'],
 144              'P2X' => $pC2['X'],
 145              'P2Y' => $pC2['Y']
 146          );
 147      }
 148  
 149      /**
 150       * Create legend sample data for the canvas.
 151       *
 152       * Common for all smoothed plots
 153       *
 154       * @access private
 155       */
 156      function _addSamplePoints($x0, $y0, $x1, $y1)
 157      {
 158          $p = abs($x1 - $x0);
 159          $cy = ($y0 + $y1) / 2;
 160          $h = abs($y1 - $y0);
 161          $dy = $h / 4;
 162          $dw = abs($x1 - $x0) / $p;
 163          for ($i = 0; $i < $p; $i++) {
 164              $v = 2 * pi() * $i / $p;
 165              $x = $x0 + $i * $dw;
 166              $y = $cy + 2 * $v * sin($v);
 167              $this->_canvas->addVertex(array('x' => $x, 'y' => $y));
 168          }
 169      }
 170  
 171  }
 172  
 173  ?>