[Sommaire] [Imprimer]

   1  <?php
   2  /**
   3   * ClickHeat : Classe de génération des cartes depuis un fichier de coordonnées X,Y / Maps generation class from a X,Y coords file
   4   * 
   5   * Cette classe est VOLONTAIREMENT écrite pour PHP 4
   6   * This class is VOLUNTARILY written for PHP 4
   7   * 
   8   * Utilisation : jettez un oeil au répertoire /examples/
   9   * Usage: have a look into /examples/ directory
  10   * 
  11   * @author Yvan Taviaud - LabsMedia - www.labsmedia.com
  12   * @since 19/05/2007
  13  **/
  14  
  15  class HeatmapFromFile extends Heatmap
  16  {
  17      /** @var array $files Fichiers de suivi à étudier / Logfiles to use */
  18      var $files = array();
  19      /** @var string $regular Expression régulière pour lire les enregistrements du fichier / Regular expression to read file entries */
  20      var $regular = '/^(\d+),(\d+)$/m';
  21  
  22      /**
  23       * Add a file to parse and check existence
  24       *
  25       * @param string $file
  26       */
  27  	function addFile($file)
  28      {
  29          if (file_exists($file))
  30          {
  31              $this->files[] = $file;
  32          }
  33      }
  34  
  35      /**
  36       * Do some tasks before drawing (database connection...)
  37      **/
  38  	function startDrawing()
  39      {
  40          return true;
  41      }
  42  
  43      /**
  44       * Find pixels coords and draw these on the current image
  45       *
  46       * @param integer $image Number of the image (to be used with $this->height)
  47       * @return boolean Success
  48      **/
  49  	function drawPixels($image)
  50      {
  51          if (count($this->files) === 0)
  52          {
  53              return $this->raiseError('No files to be used');
  54          }
  55          for ($file = 0; $file < count($this->files); $file++)
  56          {
  57              /** Read clicks in the log file */
  58              $f = @fopen($this->files[$file], 'r');
  59              if ($f === false)
  60              {
  61                  return $this->raiseError('Can\'t open file: '.$this->files[$file]);
  62              }
  63  
  64              $buffer = '';
  65              $count = 0;
  66              while (true)
  67              {
  68                  $buffer .= fgets($f, 1024);
  69                  /** Grouping by 1000 clicks */
  70                  if (feof($f) === false && $count++ !== 1000)
  71                  {
  72                      continue;
  73                  }
  74                  /** Do a regular match (faster and easier for large volume of data) */
  75                  preg_match_all($this->regular, $buffer, $clicks);
  76                  $buffer = '';
  77  
  78                  for ($i = 0, $max = count($clicks[1]); $i < $max; $i++)
  79                  {
  80                      $x = (int) $clicks[1][$i];
  81                      $y = (int) ($clicks[2][$i] - $image * $this->height);
  82                      if ($x < 0 || $x >= $this->width)
  83                      {
  84                          continue;
  85                      }
  86                      if ($y >= 0 && $y < $this->height)
  87                      {
  88                          /** Apply a calculus for the step, with increases the speed of rendering : step = 3, then pixel is drawn at x = 2 (center of a 3x3 square) */
  89                          $x -= $x % $this->step - $this->startStep;
  90                          $y -= $y % $this->step - $this->startStep;
  91                          /** Add 1 to the current color of this pixel (color which represents the sum of clicks on this pixel) */
  92                          $color = imagecolorat($this->image, $x, $y) + 1;
  93                          imagesetpixel($this->image, $x, $y, $color);
  94                          $this->maxClicks = max($this->maxClicks, $color);
  95                      }
  96                      if ($image === 0)
  97                      {
  98                          /** Looking for the maximum height of click */
  99                          $this->maxY = max($y, $this->maxY);
 100                      }
 101                  }
 102                  unset($clicks);
 103  
 104                  if ($count !== 1001)
 105                  {
 106                      break;
 107                  }
 108                  $count = 0;
 109              }
 110              fclose($f);
 111          }
 112          return true;
 113      }
 114          
 115      /**
 116       * Do some cleaning or ending tasks (close database, reset array...)
 117      **/
 118  	function finishDrawing()
 119      {
 120          $this->files = array();
 121          return true;
 122      }
 123  }
 124  ?>