[Sommaire] [Imprimer]

   1  <?php
   2  /**
   3   * ClickHeat : crée sur disque et renvoie le logo PNG 80x15 / creates on disk and returns the PNG 80x15 logo
   4   * 
   5   * @author Yvan Taviaud - LabsMedia - www.labsmedia.com
   6   * @since 31/10/2006
   7  **/
   8  
   9  define('CLICKHEAT_GREY_COLOR', 255);
  10  define('CLICKHEAT_LOW_COLOR', 0);
  11  define('CLICKHEAT_HIGH_COLOR', 255);
  12  
  13  /** Image creation */
  14  $img = imagecreatetruecolor(170, 35);
  15  $white = imagecolorallocate($img, 255, 255, 255);
  16  $blue = imagecolorallocate($img, 70, 70, 255);
  17  $red = imagecolorallocate($img, 255, 70, 70);
  18  $black = imagecolorallocate($img, 0, 0, 0);
  19  $shadow = imagecolorallocate($img, 200, 200, 255);
  20  //imagefill($img, 0, 0, $shadow);
  21  
  22  /**
  23   * Colors creation :
  24   * grey    => deep blue (rgB)    => light blue (rGB)    => green (rGb)        => yellow (RGb)        => red (Rgb)
  25   * 0       $colorLevels[0]       $colorLevels[1]       $colorLevels[2]       $colorLevels[3]       128
  26  **/
  27  $colorLevels = array(30, 55, 65, 75);
  28  $colors = array();
  29  for ($i = 0; $i < 128; $i++)
  30  {
  31      /** Red */
  32      if ($i < $colorLevels[0])
  33      {
  34          $colors[$i][0] = CLICKHEAT_GREY_COLOR + (CLICKHEAT_LOW_COLOR - CLICKHEAT_GREY_COLOR) * $i / $colorLevels[0];
  35      }
  36      elseif ($i < $colorLevels[2])
  37      {
  38          $colors[$i][0] = CLICKHEAT_LOW_COLOR;
  39      }
  40      elseif ($i < $colorLevels[3])
  41      {
  42          $colors[$i][0] = CLICKHEAT_LOW_COLOR + (CLICKHEAT_HIGH_COLOR - CLICKHEAT_LOW_COLOR) * ($i - $colorLevels[2]) / ($colorLevels[3] - $colorLevels[2]);
  43      }
  44      else
  45      {
  46          $colors[$i][0] = CLICKHEAT_HIGH_COLOR;
  47      }
  48      /** Green */
  49      if ($i < $colorLevels[0])
  50      {
  51          $colors[$i][1] = CLICKHEAT_GREY_COLOR + (CLICKHEAT_LOW_COLOR - CLICKHEAT_GREY_COLOR) * $i / $colorLevels[0];
  52      }
  53      elseif ($i < $colorLevels[1])
  54      {
  55          $colors[$i][1] = CLICKHEAT_LOW_COLOR + (CLICKHEAT_HIGH_COLOR - CLICKHEAT_LOW_COLOR) * ($i - $colorLevels[0]) / ($colorLevels[1] - $colorLevels[0]);
  56      }
  57      elseif ($i < $colorLevels[3])
  58      {
  59          $colors[$i][1] = CLICKHEAT_HIGH_COLOR;
  60      }
  61      else
  62      {
  63          $colors[$i][1] = CLICKHEAT_HIGH_COLOR - (CLICKHEAT_HIGH_COLOR - CLICKHEAT_LOW_COLOR) * ($i - $colorLevels[3]) / (127 - $colorLevels[3]);
  64      }
  65      /** Blue */
  66      if ($i < $colorLevels[0])
  67      {
  68          $colors[$i][2] = CLICKHEAT_GREY_COLOR + (CLICKHEAT_HIGH_COLOR - CLICKHEAT_GREY_COLOR) * $i / $colorLevels[0];
  69      }
  70      elseif ($i < $colorLevels[1])
  71      {
  72          $colors[$i][2] = CLICKHEAT_HIGH_COLOR;
  73      }
  74      elseif ($i < $colorLevels[2])
  75      {
  76          $colors[$i][2] = CLICKHEAT_HIGH_COLOR - (CLICKHEAT_HIGH_COLOR - CLICKHEAT_LOW_COLOR) * ($i - $colorLevels[1]) / ($colorLevels[2] - $colorLevels[1]);
  77      }
  78      else
  79      {
  80          $colors[$i][2] = CLICKHEAT_LOW_COLOR;
  81      }
  82  }
  83  
  84  $max = 35;
  85  //$blur = imagecreatetruecolor(50, 50);
  86  //$white = imagecolorallocate($blur, 255, 255, 255);
  87  imagefill($img, 0, 0, $white);
  88  /**
  89   * Courbe en forme de poire (pear-like curve)
  90   * http://www.mathcurve.com/courbes2d/piriforme/piriforme.shtml
  91  **/
  92  for ($i = 1; $i <= $max; $i++)
  93  {
  94      $a = $max - $i + 1;
  95      $b = $a * (2 - $i / $max);
  96      $color = imagecolorallocate($img, $colors[ceil($i * 127 / $max)][0], $colors[ceil($i * 127 / $max)][1], $colors[ceil($i * 127 / $max)][2]);
  97      for ($t = 0; $t < 360; $t++)
  98      {
  99          imagesetpixel($img, 8.5 + $a * $a / $b * cos($t) * cos($t) * cos($t) * sin($t), min($max - 1, $max - $a + $a * cos($t) * cos($t)), $color);
 100      }
 101  }
 102  
 103  $string = 'ClickHeat';
 104  $x = 18;
 105  $y = 32;
 106  $font = '/mnt/win_dd/WINDOWS/Fonts/verdana.ttf';
 107  if (!file_exists($font))
 108  {
 109      exit('Font not found');
 110  }
 111  $size = 25;
 112  for ($i = 0, $max = strlen($string); $i < $max; $i++)
 113  {
 114      $info = imagettfbbox($size, 0, $font, $string[$i]);
 115      if (strtolower($string[$i]) === 'h')
 116      {
 117          $font = '/mnt/win_dd/WINDOWS/Fonts/verdanab.ttf';
 118      }
 119      imagettftext($img, $size, 0, $x + 1, $y + 1, $shadow, $font, $string[$i]);
 120      imagettftext($img, $size, 0, $x, $y, $blue, $font, $string[$i]);
 121      $x += $info[2] - $info[0] + 3;
 122      if (strtolower($string[$i]) === 'c' || strtolower($string[$i]) === 'k')
 123      {
 124          $x -= 2;
 125      }
 126      if (strtolower($string[$i]) === 'h')
 127      {
 128          $x += 4;
 129      }
 130  }
 131  
 132  header('Content-Type: image/png');
 133  imagepng($img, './images/logo170.png');
 134  imagepng($img);
 135  imagedestroy($img);
 136  ?>