[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(180, 45);
  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, $white);
  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(0, 40, 45, 70, 100);
  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 = 12;
  85  $pixels = array(
  86  '                 ***      ',
  87  '              *****       ',
  88  '            *****         ',
  89  '          ******          ',
  90  '         ******           ',
  91  '       *******            ',
  92  '      *******             ',
  93  '      *******             ',
  94  '     ********             ',
  95  '    *********             ',
  96  '   **********             ',
  97  '   ***********            ',
  98  '  *************           ',
  99  '  **************          ',
 100  ' ****************         ',
 101  ' ******************       ',
 102  ' ********************     ',
 103  '***********************   ',
 104  '************************  ',
 105  '************************* ',
 106  '************************* ',
 107  '**************************',
 108  '**************************',
 109  ' *************************',
 110  ' *************************',
 111  '  ************************',
 112  '  ************************',
 113  '   ***********************',
 114  '    **********************',
 115  '     ******************** ',
 116  '      ******************* ',
 117  '       ****************** ',
 118  '         ***************  ',
 119  '          **************  ',
 120  '            ***********   ',
 121  '              *********   ',
 122  '                ******    ',
 123  '                 *****    ',
 124  '                 ****     ',
 125  '                 ***      ',
 126  '                 **       ',
 127  '                *         ');
 128  $mx = strlen($pixels[0]);
 129  $my = count($pixels);
 130  $blur = imagecreatetruecolor($mx + 2, $my + 2);
 131  $white = imagecolorallocate($blur, 255, 255, 255);
 132  imagefill($blur, 0, 0, $white);
 133  for ($x = 0; $x < $mx; $x++)
 134  {
 135      for ($y = 0; $y < $my; $y++)
 136      {
 137          if ($pixels[$y][$x] === '*')
 138          {
 139              imagesetpixel($blur, $x + 1, $y + 1, $black);
 140          }
 141      }
 142  }
 143  
 144  $previous = $white;
 145  for ($i = 0; $i <= $max; $i++)
 146  {
 147      $color = imagecolorallocate($blur, $colors[ceil($i * 127 / $max)][0], $colors[ceil($i * 127 / $max)][1], $colors[ceil($i * 127 / $max)][2]);
 148      for ($x = 1; $x < $mx + 1; $x++)
 149      {
 150          for ($y = 1; $y < $my + 1; $y++)
 151          {
 152              if (imagecolorat($blur, $x, $y) === $black)
 153              {
 154                  if ($i === $max || imagecolorat($blur, $x + 1, $y) === $previous || imagecolorat($blur, $x - 1, $y) === $previous
 155                  || imagecolorat($blur, $x, $y + 1) === $previous || imagecolorat($blur, $x, $y - 1) === $previous)
 156                  {
 157                      imagesetpixel($blur, $x, $y, $color);
 158                  }
 159              }
 160          }
 161      }
 162      $previous = $color;
 163  }
 164  $color = array();
 165  $level = 1;
 166  for ($x = 1; $x < $mx + 1; $x++)
 167  {
 168      for ($y = 1; $y < $my + 1; $y++)
 169      {
 170          $color[0] = imagecolorsforindex($blur, imagecolorat($blur, $x, $y));
 171          if ($color[0]['red'] + $color[0]['green'] + $color[0]['blue'] === 765)
 172          {
 173              $color[1] = imagecolorsforindex($blur, imagecolorat($blur, $x + 1, $y));
 174              $color[2] = imagecolorsforindex($blur, imagecolorat($blur, $x - 1, $y));
 175              $color[3] = imagecolorsforindex($blur, imagecolorat($blur, $x, $y + 1));
 176              $color[4] = imagecolorsforindex($blur, imagecolorat($blur, $x, $y - 1));
 177              $col = imagecolorallocate($img, ceil(($level * $color[0]['red'] + $color[1]['red'] + $color[2]['red'] + $color[3]['red'] + $color[4]['red']) / ($level + 4)),
 178              ceil(($level * $color[0]['green'] + $color[1]['green'] + $color[2]['green'] + $color[3]['green'] + $color[4]['green']) / ($level + 4)),
 179              ceil(($level * $color[0]['blue'] + $color[1]['blue'] + $color[2]['blue'] + $color[3]['blue'] + $color[4]['blue']) / ($level + 4)));
 180          }
 181          else
 182          {
 183              $col = imagecolorallocate($img, $color[0]['red'], $color[0]['green'], $color[0]['blue']);
 184          }
 185          imagesetpixel($img, $x, $y, $col);
 186      }
 187  }
 188  imagedestroy($blur);
 189  
 190  $string = 'ClickHeat';
 191  $x = 28;
 192  $font = '/home/yvan/.ies4linux/ie5/drive_c/windows/fonts/verdana.ttf';
 193  $size = 25;
 194  for ($i = 0, $max = strlen($string); $i < $max; $i++)
 195  {
 196      $info = imagettfbbox($size, 0, $font, $string[$i]);
 197      if (strtolower($string[$i]) === 'h')
 198      {
 199          $font = '/home/yvan/.ies4linux/ie5/drive_c/windows/fonts/verdanab.ttf';
 200      }
 201      imagettftext($img, $size, 0, $x + 1, 36, $shadow, $font, $string[$i]);
 202      imagettftext($img, $size, 0, $x, 35, $blue, $font, $string[$i]);
 203      $x += $info[2] - $info[0] + 3;
 204      if (strtolower($string[$i]) === 'c' || strtolower($string[$i]) === 'k')
 205      {
 206          $x -= 2;
 207      }
 208      if (strtolower($string[$i]) === 'h')
 209      {
 210          $x += 4;
 211      }
 212  }
 213  
 214  header('Content-Type: image/png');
 215  imagepng($img, './images/logo.big.png');
 216  imagepng($img);
 217  imagedestroy($img);
 218  ?>