[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: Line.php,v 1.14 2006/03/02 12:37:37 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 line chart.
  38   *
  39   * Similar to a {@link Image_Graph_Plot_Line}, 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_Line}. 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_Line extends Image_Graph_Plot_Smoothed_Bezier
  55  {
  56  
  57      /**
  58       * Gets the fill style of the element
  59       *
  60       * @return int A GD filestyle representing the fill style
  61       * @see Image_Graph_Fill
  62       * @access private
  63       */
  64      function _getFillStyle($ID = false)
  65      {
  66          return IMG_COLOR_TRANSPARENT;
  67      }
  68  
  69      /**
  70       * Perform the actual drawing on the legend.
  71       *
  72       * @param int $x0 The top-left x-coordinate
  73       * @param int $y0 The top-left y-coordinate
  74       * @param int $x1 The bottom-right x-coordinate
  75       * @param int $y1 The bottom-right y-coordinate
  76       * @access private
  77       */
  78      function _drawLegendSample($x0, $y0, $x1, $y1)
  79      {
  80          $this->_addSamplePoints($x0, $y0, $x1, $y1);
  81          $this->_canvas->polygon(array('connect' => false));
  82      }
  83  
  84      /**
  85       * Output the Bezier smoothed plot as an Line Chart
  86       *
  87       * @return bool Was the output 'good' (true) or 'bad' (false).
  88       * @access private
  89       */
  90      function _done()
  91      {
  92          if (parent::_done() === false) {
  93              return false;
  94          }
  95  
  96          $this->_canvas->startGroup(get_class($this) . '_' . $this->_title);
  97          $this->_clip(true);
  98          $keys = array_keys($this->_dataset);
  99          foreach ($keys as $key) {
 100              $dataset =& $this->_dataset[$key];
 101              $dataset->_reset();
 102              $numPoints = 0;
 103              while ($p1 = $dataset->_next()) {
 104                  if ($p1['Y'] === null) {
 105                      if ($numPoints > 1) {
 106                          $this->_getLineStyle($key);
 107                          $this->_canvas->polygon(array('connect' => false, 'map_vertices' => true));
 108                      }
 109                      else {
 110                          $this->_canvas->reset();
 111                      }
 112                      $numPoints = 0;
 113                  } else {
 114                      $p0 = $dataset->_nearby(-2);
 115                      $p2 = $dataset->_nearby(0);
 116                      $p3 = $dataset->_nearby(1);
 117  
 118                      if (($p0) && ($p0['Y'] === null)) {
 119                          $p0 = false;
 120                      }
 121                      if (($p2) && ($p2['Y'] === null)) {
 122                          $p2 = false;
 123                      }
 124                      if (($p3) && ($p3['Y'] === null)) {
 125                          $p3 = false;
 126                      }
 127  
 128                      if ($p2) {
 129                          $cp = $this->_getControlPoints($p1, $p0, $p2, $p3);
 130                          $this->_canvas->addSpline(
 131                              $this->_mergeData(
 132                                  $p1,
 133                                array(
 134                                      'x' => $cp['X'],
 135                                         'y' => $cp['Y'],
 136                                      'p1x' => $cp['P1X'],
 137                                      'p1y' => $cp['P1Y'],
 138                                      'p2x' => $cp['P2X'],
 139                                      'p2y' => $cp['P2Y']
 140                                  )
 141                              )
 142                          );
 143                      } else {
 144                          $x = $this->_pointX($p1);
 145                          $y = $this->_pointY($p1);
 146                          $this->_canvas->addVertex(
 147                              $this->_mergeData(
 148                                  $p1,
 149                                  array('x' => $x, 'y' => $y)
 150                              )
 151                          );
 152                      }
 153                      $numPoints++;
 154                  }
 155              }
 156              if ($numPoints > 1) {
 157                  $this->_getLineStyle();
 158                  $this->_canvas->polygon(array('connect' => false, 'map_vertices' => true));
 159              }
 160              else {
 161                  $this->_canvas->reset();
 162              }
 163          }
 164          unset($keys);
 165          $this->_drawMarker();
 166          $this->_clip(false);
 167          $this->_canvas->endGroup();
 168          return true;
 169      }
 170  
 171  }
 172  ?>