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PHP Script  |  2008-07-02  |  6.0 KB  |  172 lines
  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. ?>