[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: Area.php,v 1.11 2005/11/27 22:21:17 nosey Exp $
  28   * @link       http://pear.php.net/package/Image_Graph
  29   */
  30  
  31  /**
  32   * Include file Image/Graph/Plot/Smoothed/Bezier.php
  33   */
  34  require_once  'Image/Graph/Plot/Smoothed/Bezier.php';
  35  
  36  /**
  37   * Bezier smoothed area chart
  38   *
  39   * Similar to an {@link Image_Graph_Plot_Area}, but the interconnecting lines
  40   * between two datapoints are smoothed using a Bezier curve, which enables the
  41   * chart to appear as a nice curved plot instead of the sharp edges of a
  42   * conventional {@link Image_Graph_Plot_Area}. Smoothed charts are only supported
  43   * with non-stacked types
  44   *
  45   * @category   Images
  46   * @package    Image_Graph
  47   * @subpackage Plot
  48   * @author     Jesper Veggerby <pear.nosey@veggerby.dk>
  49   * @copyright  Copyright (C) 2003, 2004 Jesper Veggerby Hansen
  50   * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
  51   * @version    Release: 0.7.2
  52   * @link       http://pear.php.net/package/Image_Graph
  53   */
  54  class Image_Graph_Plot_Smoothed_Area extends Image_Graph_Plot_Smoothed_Bezier
  55  {
  56  
  57      /**
  58       * Perform the actual drawing on the legend.
  59       *
  60       * @param int $x0 The top-left x-coordinate
  61       * @param int $y0 The top-left y-coordinate
  62       * @param int $x1 The bottom-right x-coordinate
  63       * @param int $y1 The bottom-right y-coordinate
  64       * @access private
  65       */
  66      function _drawLegendSample($x0, $y0, $x1, $y1)
  67      {
  68  
  69          $this->_canvas->addVertex(array('x' => $x0, 'y' => $y1));
  70          $this->_addSamplePoints($x0, $y0, $x1, $y1);
  71          $this->_canvas->addVertex(array('x' => $x1, 'y' => $y1));
  72          $this->_canvas->polygon(array('connect' => true));
  73      }
  74  
  75      /**
  76       * Output the Bezier smoothed plot as an Area Chart
  77       *
  78       * @return bool Was the output 'good' (true) or 'bad' (false).
  79       * @access private
  80       */
  81      function _done()
  82      {
  83          if (parent::_done() === false) {
  84              return false;
  85          }
  86  
  87          $this->_canvas->startGroup(get_class($this) . '_' . $this->_title);
  88          $this->_clip(true);
  89          
  90          $keys = array_keys($this->_dataset);
  91          foreach ($keys as $key) {
  92              $dataset =& $this->_dataset[$key];
  93              $dataset->_reset();
  94              $first = true;
  95              while ($p1 = $dataset->_next()) {
  96                  $p0 = $dataset->_nearby(-2);
  97                  $p2 = $dataset->_nearby(0);
  98                  $p3 = $dataset->_nearby(1);
  99                  if ($first) {
 100                      $p = $p1;
 101                      $p['Y'] = '#min_pos#';
 102                      $x = $this->_pointX($p);
 103                      $y = $this->_pointY($p);
 104                      $this->_canvas->addVertex(array('x' => $x, 'y' => $y));
 105                  }
 106  
 107                  if ($p2) {
 108                      $cp = $this->_getControlPoints($p1, $p0, $p2, $p3);
 109                      $this->_canvas->addSpline(
 110                          array(
 111                              'x' => $cp['X'],
 112                              'y' => $cp['Y'],
 113                              'p1x' => $cp['P1X'],
 114                              'p1y' => $cp['P1Y'],
 115                              'p2x' => $cp['P2X'],
 116                              'p2y' => $cp['P2Y']
 117                          )
 118                      );
 119                  } else {
 120                      $x = $this->_pointX($p1);
 121                      $y = $this->_pointY($p1);
 122                      $this->_canvas->addVertex(array('x' => $x, 'y' => $y));
 123                  }
 124                  $lastPoint = $p1;
 125                  $first = false;
 126              }
 127              $lastPoint['Y'] = '#min_pos#';
 128              $x = $this->_pointX($lastPoint);
 129              $y = $this->_pointY($lastPoint);
 130              $this->_canvas->addVertex(array('x' => $x, 'y' => $y));
 131  
 132              $this->_getFillStyle($key);
 133              $this->_getLineStyle($key);
 134              $this->_canvas->polygon(array('connect' => true));
 135          }
 136          unset($keys);
 137          $this->_drawMarker();
 138          $this->_clip(false);
 139          $this->_canvas->endGroup();
 140          return true;
 141      }
 142  
 143  }
 144  
 145  ?>