Verzeichnisstruktur phpBB-3.1.0


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27.10.2014

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colour_manager.php

Zuletzt modifiziert: 09.10.2024, 12:51 - Dateigröße: 9.57 KiB


 001  <?php
 002  /**
 003  *
 004  * This file is part of the phpBB Forum Software package.
 005  *
 006  * @copyright (c) phpBB Limited <https://www.phpbb.com>
 007  * @license GNU General Public License, version 2 (GPL-2.0)
 008  *
 009  * For full copyright and license information, please see
 010  * the docs/CREDITS.txt file.
 011  *
 012  */
 013   
 014  namespace phpbb\captcha;
 015   
 016  class colour_manager
 017  {
 018      var $img;
 019      var $mode;
 020      var $colours;
 021      var $named_colours;
 022   
 023      /**
 024      * Create the colour manager, link it to the image resource
 025      */
 026      function __construct($img, $background = false, $mode = 'ahsv')
 027      {
 028          $this->img = $img;
 029          $this->mode = $mode;
 030          $this->colours = array();
 031          $this->named_colours = array();
 032   
 033          if ($background !== false)
 034          {
 035              $bg = $this->allocate_named('background', $background);
 036              imagefill($this->img, 0, 0, $bg);
 037          }
 038      }
 039   
 040      /**
 041      * Lookup a named colour resource
 042      */
 043      function get_resource($named_colour)
 044      {
 045          if (isset($this->named_colours[$named_colour]))
 046          {
 047              return $this->named_colours[$named_colour];
 048          }
 049   
 050          if (isset($this->named_rgb[$named_colour]))
 051          {
 052              return $this->allocate_named($named_colour, $this->named_rgb[$named_colour], 'rgb');
 053          }
 054   
 055          return false;
 056      }
 057   
 058      /**
 059      * Assign a name to a colour resource
 060      */
 061      function name_colour($name, $resource)
 062      {
 063          $this->named_colours[$name] = $resource;
 064      }
 065   
 066      /**
 067      * names and allocates a colour resource
 068      */
 069      function allocate_named($name, $colour, $mode = false)
 070      {
 071          $resource = $this->allocate($colour, $mode);
 072   
 073          if ($resource !== false)
 074          {
 075              $this->name_colour($name, $resource);
 076          }
 077          return $resource;
 078      }
 079   
 080      /**
 081      * allocates a specified colour into the image
 082      */
 083      function allocate($colour, $mode = false)
 084      {
 085          if ($mode === false)
 086          {
 087              $mode = $this->mode;
 088          }
 089   
 090          if (!is_array($colour))
 091          {
 092              if (isset($this->named_rgb[$colour]))
 093              {
 094                  return $this->allocate_named($colour, $this->named_rgb[$colour], 'rgb');
 095              }
 096   
 097              if (!is_int($colour))
 098              {
 099                  return false;
 100              }
 101   
 102              $mode = 'rgb';
 103              $colour = array(255 & ($colour >> 16), 255 & ($colour >>  8), 255 & $colour);
 104          }
 105   
 106          if (isset($colour['mode']))
 107          {
 108              $mode = $colour['mode'];
 109              unset($colour['mode']);
 110          }
 111   
 112          if (isset($colour['random']))
 113          {
 114              unset($colour['random']);
 115              // everything else is params
 116              return $this->random_colour($colour, $mode);
 117          }
 118   
 119          $rgb        = $this->model_convert($colour, $mode, 'rgb');
 120          $store        = ($this->mode == 'rgb') ? $rgb : $this->model_convert($colour, $mode, $this->mode);
 121          $resource    = imagecolorallocate($this->img, $rgb[0], $rgb[1], $rgb[2]);
 122          $this->colours[$resource] = $store;
 123   
 124          return $resource;
 125      }
 126   
 127      /**
 128      * randomly generates a colour, with optional params
 129      */
 130      function random_colour($params = array(), $mode = false)
 131      {
 132          if ($mode === false)
 133          {
 134              $mode = $this->mode;
 135          }
 136   
 137          switch ($mode)
 138          {
 139              case 'rgb':
 140                  // @TODO random rgb generation. do we intend to do this, or is it just too tedious?
 141                  break;
 142   
 143              case 'ahsv':
 144              case 'hsv':
 145              default:
 146   
 147                  $default_params = array(
 148                      'hue_bias'            => false,    // degree / 'r'/'g'/'b'/'c'/'m'/'y'   /'o'
 149                      'hue_range'            => false,    // if hue bias, then difference range +/- from bias
 150                      'min_saturation'    => 30,        // 0 - 100
 151                      'max_saturation'    => 80,        // 0 - 100
 152                      'min_value'            => 30,        // 0 - 100
 153                      'max_value'            => 80,        // 0 - 100
 154                  );
 155   
 156                  $alt = ($mode == 'ahsv') ? true : false;
 157                  $params = array_merge($default_params, $params);
 158   
 159                  $min_hue        = 0;
 160                  $max_hue        = 359;
 161                  $min_saturation    = max(0, $params['min_saturation']);
 162                  $max_saturation    = min(100, $params['max_saturation']);
 163                  $min_value        = max(0, $params['min_value']);
 164                  $max_value        = min(100, $params['max_value']);
 165   
 166                  if ($params['hue_bias'] !== false)
 167                  {
 168                      if (is_numeric($params['hue_bias']))
 169                      {
 170                          $h = intval($params['hue_bias']) % 360;
 171                      }
 172                      else
 173                      {
 174                          switch ($params['hue_bias'])
 175                          {
 176                              case 'o':
 177                                  $h = $alt ?  60 :  30;
 178                                  break;
 179   
 180                              case 'y':
 181                                  $h = $alt ? 120 :  60;
 182                                  break;
 183   
 184                              case 'g':
 185                                  $h = $alt ? 180 : 120;
 186                                  break;
 187   
 188                              case 'c':
 189                                  $h = $alt ? 210 : 180;
 190                                  break;
 191   
 192                              case 'b':
 193                                  $h = 240;
 194                                  break;
 195   
 196                              case 'm':
 197                                  $h = 300;
 198                                  break;
 199   
 200                              case 'r':
 201                              default:
 202                                  $h = 0;
 203                                  break;
 204                          }
 205                      }
 206   
 207                      $min_hue = $h + 360;
 208                      $max_hue = $h + 360;
 209   
 210                      if ($params['hue_range'])
 211                      {
 212                          $min_hue -= min(180, $params['hue_range']);
 213                          $max_hue += min(180, $params['hue_range']);
 214                      }
 215                  }
 216   
 217                  $h = mt_rand($min_hue, $max_hue);
 218                  $s = mt_rand($min_saturation, $max_saturation);
 219                  $v = mt_rand($min_value, $max_value);
 220   
 221                  return $this->allocate(array($h, $s, $v), $mode);
 222   
 223                  break;
 224          }
 225      }
 226   
 227      /**
 228      */
 229      function colour_scheme($resource, $include_original = true)
 230      {
 231          $mode = 'hsv';
 232   
 233          if (($pre = $this->get_resource($resource)) !== false)
 234          {
 235              $resource = $pre;
 236          }
 237   
 238          $colour = $this->model_convert($this->colours[$resource], $this->mode, $mode);
 239          $results = ($include_original) ? array($resource) : array();
 240          $colour2 = $colour3 = $colour4 = $colour;
 241          $colour2[0] += 150;
 242          $colour3[0] += 180;
 243          $colour4[0] += 210;
 244   
 245          $results[] = $this->allocate($colour2, $mode);
 246          $results[] = $this->allocate($colour3, $mode);
 247          $results[] = $this->allocate($colour4, $mode);
 248   
 249          return $results;
 250      }
 251   
 252      /**
 253      */
 254      function mono_range($resource, $count = 5, $include_original = true)
 255      {
 256          if (is_array($resource))
 257          {
 258              $results = array();
 259              for ($i = 0, $size = sizeof($resource); $i < $size; ++$i)
 260              {
 261                  $results = array_merge($results, $this->mono_range($resource[$i], $count, $include_original));
 262              }
 263              return $results;
 264          }
 265   
 266          $mode = (in_array($this->mode, array('hsv', 'ahsv'), true) ? $this->mode : 'ahsv');
 267          if (($pre = $this->get_resource($resource)) !== false)
 268          {
 269              $resource = $pre;
 270          }
 271   
 272          $colour = $this->model_convert($this->colours[$resource], $this->mode, $mode);
 273   
 274          $results = array();
 275          if ($include_original)
 276          {
 277              $results[] = $resource;
 278              $count--;
 279          }
 280   
 281          // This is a hard problem. I chicken out and try to maintain readability at the cost of less randomness.
 282   
 283          while ($count > 0)
 284          {
 285              $colour[1] = ($colour[1] + mt_rand(40,60)) % 99;
 286              $colour[2] = ($colour[2] + mt_rand(40,60));
 287              $results[] = $this->allocate($colour, $mode);
 288              $count--;
 289          }
 290          return $results;
 291      }
 292   
 293      /**
 294      * Convert from one colour model to another
 295      */
 296      function model_convert($colour, $from_model, $to_model)
 297      {
 298          if ($from_model == $to_model)
 299          {
 300              return $colour;
 301          }
 302   
 303          switch ($to_model)
 304          {
 305              case 'hsv':
 306   
 307                  switch ($from_model)
 308                  {
 309                      case 'ahsv':
 310                          return $this->ah2h($colour);
 311                          break;
 312   
 313                      case 'rgb':
 314                          return $this->rgb2hsv($colour);
 315                          break;
 316                  }
 317                  break;
 318   
 319              case 'ahsv':
 320   
 321                  switch ($from_model)
 322                  {
 323                      case 'hsv':
 324                          return $this->h2ah($colour);
 325                          break;
 326   
 327                      case 'rgb':
 328                          return $this->h2ah($this->rgb2hsv($colour));
 329                          break;
 330                  }
 331                  break;
 332   
 333              case 'rgb':
 334                  switch ($from_model)
 335                  {
 336                      case 'hsv':
 337                          return $this->hsv2rgb($colour);
 338                          break;
 339   
 340                      case 'ahsv':
 341                          return $this->hsv2rgb($this->ah2h($colour));
 342                          break;
 343                  }
 344                  break;
 345          }
 346          return false;
 347      }
 348   
 349      /**
 350      * Slightly altered from wikipedia's algorithm
 351      */
 352      function hsv2rgb($hsv)
 353      {
 354          $this->normalize_hue($hsv[0]);
 355   
 356          $h = $hsv[0];
 357          $s = min(1, max(0, $hsv[1] / 100));
 358          $v = min(1, max(0, $hsv[2] / 100));
 359   
 360          // calculate hue sector
 361          $hi = floor($hsv[0] / 60);
 362   
 363          // calculate opposite colour
 364          $p = $v * (1 - $s);
 365   
 366          // calculate distance between hex vertices
 367          $f = ($h / 60) - $hi;
 368   
 369          // coming in or going out?
 370          if (!($hi & 1))
 371          {
 372              $f = 1 - $f;
 373          }
 374   
 375          // calculate adjacent colour
 376          $q = $v * (1 - ($f * $s));
 377   
 378          switch ($hi)
 379          {
 380              case 0:
 381                  $rgb = array($v, $q, $p);
 382                  break;
 383   
 384              case 1:
 385                  $rgb = array($q, $v, $p);
 386                  break;
 387   
 388              case 2:
 389                  $rgb = array($p, $v, $q);
 390                  break;
 391   
 392              case 3:
 393                  $rgb = array($p, $q, $v);
 394                  break;
 395   
 396              case 4:
 397                  $rgb = array($q, $p, $v);
 398                  break;
 399   
 400              case 5:
 401                  $rgb = array($v, $p, $q);
 402                  break;
 403   
 404              default:
 405                  return array(0, 0, 0);
 406                  break;
 407          }
 408   
 409          return array(255 * $rgb[0], 255 * $rgb[1], 255 * $rgb[2]);
 410      }
 411   
 412      /**
 413      * (more than) Slightly altered from wikipedia's algorithm
 414      */
 415      function rgb2hsv($rgb)
 416      {
 417          $r = min(255, max(0, $rgb[0]));
 418          $g = min(255, max(0, $rgb[1]));
 419          $b = min(255, max(0, $rgb[2]));
 420          $max = max($r, $g, $b);
 421          $min = min($r, $g, $b);
 422   
 423          $v = $max / 255;
 424          $s = (!$max) ? 0 : 1 - ($min / $max);
 425   
 426          // if max - min is 0, we want hue to be 0 anyway.
 427          $h = $max - $min;
 428   
 429          if ($h)
 430          {
 431              switch ($max)
 432              {
 433                  case $g:
 434                      $h = 120 + (60 * ($b - $r) / $h);
 435                      break;
 436   
 437                  case $b:
 438                      $h = 240 + (60 * ($r - $g) / $h);
 439                      break;
 440   
 441                  case $r:
 442                      $h = 360 + (60 * ($g - $b) / $h);
 443                      break;
 444              }
 445          }
 446          $this->normalize_hue($h);
 447   
 448          return array($h, $s * 100, $v * 100);
 449      }
 450   
 451      /**
 452      */
 453      function normalize_hue(&$hue)
 454      {
 455          $hue %= 360;
 456   
 457          if ($hue < 0)
 458          {
 459              $hue += 360;
 460          }
 461      }
 462   
 463      /**
 464      * Alternate hue to hue
 465      */
 466      function ah2h($ahue)
 467      {
 468          if (is_array($ahue))
 469          {
 470              $ahue[0] = $this->ah2h($ahue[0]);
 471              return $ahue;
 472          }
 473          $this->normalize_hue($ahue);
 474   
 475          // blue through red is already ok
 476          if ($ahue >= 240)
 477          {
 478              return $ahue;
 479          }
 480   
 481          // ahue green is at 180
 482          if ($ahue >= 180)
 483          {
 484              // return (240 - (2 * (240 - $ahue)));
 485              return (2 * $ahue) - 240; // equivalent
 486          }
 487   
 488          // ahue yellow is at 120   (RYB rather than RGB)
 489          if ($ahue >= 120)
 490          {
 491              return $ahue - 60;
 492          }
 493   
 494          return $ahue / 2;
 495      }
 496   
 497      /**
 498      * hue to Alternate hue
 499      */
 500      function h2ah($hue)
 501      {
 502          if (is_array($hue))
 503          {
 504              $hue[0] = $this->h2ah($hue[0]);
 505              return $hue;
 506          }
 507          $this->normalize_hue($hue);
 508   
 509          // blue through red is already ok
 510          if ($hue >= 240)
 511          {
 512              return $hue;
 513          }
 514          else if ($hue <= 60)
 515          {
 516              return $hue * 2;
 517          }
 518          else if ($hue <= 120)
 519          {
 520              return $hue + 60;
 521          }
 522          else
 523          {
 524              return ($hue + 240) / 2;
 525          }
 526      }
 527  }
 528   

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Verzeichnisstruktur phpBB-3.1.0

Zuletzt modifiziert: 09.10.2024, 12:51 - Dateigröße: 9.57 KiB

colour_manager.php


 001  <?php
 002  /**
 003  *
 004  * This file is part of the phpBB Forum Software package.
 005  *
 006  * @copyright (c) phpBB Limited <https://www.phpbb.com>
 007  * @license GNU General Public License, version 2 (GPL-2.0)
 008  *
 009  * For full copyright and license information, please see
 010  * the docs/CREDITS.txt file.
 011  *
 012  */
 013   
 014  namespace phpbb\captcha;
 015   
 016  class colour_manager
 017  {
 018      var $img;
 019      var $mode;
 020      var $colours;
 021      var $named_colours;
 022   
 023      /**
 024      * Create the colour manager, link it to the image resource
 025      */
 026      function __construct($img, $background = false, $mode = 'ahsv')
 027      {
 028          $this->img = $img;
 029          $this->mode = $mode;
 030          $this->colours = array();
 031          $this->named_colours = array();
 032   
 033          if ($background !== false)
 034          {
 035              $bg = $this->allocate_named('background', $background);
 036              imagefill($this->img, 0, 0, $bg);
 037          }
 038      }
 039   
 040      /**
 041      * Lookup a named colour resource
 042      */
 043      function get_resource($named_colour)
 044      {
 045          if (isset($this->named_colours[$named_colour]))
 046          {
 047              return $this->named_colours[$named_colour];
 048          }
 049   
 050          if (isset($this->named_rgb[$named_colour]))
 051          {
 052              return $this->allocate_named($named_colour, $this->named_rgb[$named_colour], 'rgb');
 053          }
 054   
 055          return false;
 056      }
 057   
 058      /**
 059      * Assign a name to a colour resource
 060      */
 061      function name_colour($name, $resource)
 062      {
 063          $this->named_colours[$name] = $resource;
 064      }
 065   
 066      /**
 067      * names and allocates a colour resource
 068      */
 069      function allocate_named($name, $colour, $mode = false)
 070      {
 071          $resource = $this->allocate($colour, $mode);
 072   
 073          if ($resource !== false)
 074          {
 075              $this->name_colour($name, $resource);
 076          }
 077          return $resource;
 078      }
 079   
 080      /**
 081      * allocates a specified colour into the image
 082      */
 083      function allocate($colour, $mode = false)
 084      {
 085          if ($mode === false)
 086          {
 087              $mode = $this->mode;
 088          }
 089   
 090          if (!is_array($colour))
 091          {
 092              if (isset($this->named_rgb[$colour]))
 093              {
 094                  return $this->allocate_named($colour, $this->named_rgb[$colour], 'rgb');
 095              }
 096   
 097              if (!is_int($colour))
 098              {
 099                  return false;
 100              }
 101   
 102              $mode = 'rgb';
 103              $colour = array(255 & ($colour >> 16), 255 & ($colour >>  8), 255 & $colour);
 104          }
 105   
 106          if (isset($colour['mode']))
 107          {
 108              $mode = $colour['mode'];
 109              unset($colour['mode']);
 110          }
 111   
 112          if (isset($colour['random']))
 113          {
 114              unset($colour['random']);
 115              // everything else is params
 116              return $this->random_colour($colour, $mode);
 117          }
 118   
 119          $rgb        = $this->model_convert($colour, $mode, 'rgb');
 120          $store        = ($this->mode == 'rgb') ? $rgb : $this->model_convert($colour, $mode, $this->mode);
 121          $resource    = imagecolorallocate($this->img, $rgb[0], $rgb[1], $rgb[2]);
 122          $this->colours[$resource] = $store;
 123   
 124          return $resource;
 125      }
 126   
 127      /**
 128      * randomly generates a colour, with optional params
 129      */
 130      function random_colour($params = array(), $mode = false)
 131      {
 132          if ($mode === false)
 133          {
 134              $mode = $this->mode;
 135          }
 136   
 137          switch ($mode)
 138          {
 139              case 'rgb':
 140                  // @TODO random rgb generation. do we intend to do this, or is it just too tedious?
 141                  break;
 142   
 143              case 'ahsv':
 144              case 'hsv':
 145              default:
 146   
 147                  $default_params = array(
 148                      'hue_bias'            => false,    // degree / 'r'/'g'/'b'/'c'/'m'/'y'   /'o'
 149                      'hue_range'            => false,    // if hue bias, then difference range +/- from bias
 150                      'min_saturation'    => 30,        // 0 - 100
 151                      'max_saturation'    => 80,        // 0 - 100
 152                      'min_value'            => 30,        // 0 - 100
 153                      'max_value'            => 80,        // 0 - 100
 154                  );
 155   
 156                  $alt = ($mode == 'ahsv') ? true : false;
 157                  $params = array_merge($default_params, $params);
 158   
 159                  $min_hue        = 0;
 160                  $max_hue        = 359;
 161                  $min_saturation    = max(0, $params['min_saturation']);
 162                  $max_saturation    = min(100, $params['max_saturation']);
 163                  $min_value        = max(0, $params['min_value']);
 164                  $max_value        = min(100, $params['max_value']);
 165   
 166                  if ($params['hue_bias'] !== false)
 167                  {
 168                      if (is_numeric($params['hue_bias']))
 169                      {
 170                          $h = intval($params['hue_bias']) % 360;
 171                      }
 172                      else
 173                      {
 174                          switch ($params['hue_bias'])
 175                          {
 176                              case 'o':
 177                                  $h = $alt ?  60 :  30;
 178                                  break;
 179   
 180                              case 'y':
 181                                  $h = $alt ? 120 :  60;
 182                                  break;
 183   
 184                              case 'g':
 185                                  $h = $alt ? 180 : 120;
 186                                  break;
 187   
 188                              case 'c':
 189                                  $h = $alt ? 210 : 180;
 190                                  break;
 191   
 192                              case 'b':
 193                                  $h = 240;
 194                                  break;
 195   
 196                              case 'm':
 197                                  $h = 300;
 198                                  break;
 199   
 200                              case 'r':
 201                              default:
 202                                  $h = 0;
 203                                  break;
 204                          }
 205                      }
 206   
 207                      $min_hue = $h + 360;
 208                      $max_hue = $h + 360;
 209   
 210                      if ($params['hue_range'])
 211                      {
 212                          $min_hue -= min(180, $params['hue_range']);
 213                          $max_hue += min(180, $params['hue_range']);
 214                      }
 215                  }
 216   
 217                  $h = mt_rand($min_hue, $max_hue);
 218                  $s = mt_rand($min_saturation, $max_saturation);
 219                  $v = mt_rand($min_value, $max_value);
 220   
 221                  return $this->allocate(array($h, $s, $v), $mode);
 222   
 223                  break;
 224          }
 225      }
 226   
 227      /**
 228      */
 229      function colour_scheme($resource, $include_original = true)
 230      {
 231          $mode = 'hsv';
 232   
 233          if (($pre = $this->get_resource($resource)) !== false)
 234          {
 235              $resource = $pre;
 236          }
 237   
 238          $colour = $this->model_convert($this->colours[$resource], $this->mode, $mode);
 239          $results = ($include_original) ? array($resource) : array();
 240          $colour2 = $colour3 = $colour4 = $colour;
 241          $colour2[0] += 150;
 242          $colour3[0] += 180;
 243          $colour4[0] += 210;
 244   
 245          $results[] = $this->allocate($colour2, $mode);
 246          $results[] = $this->allocate($colour3, $mode);
 247          $results[] = $this->allocate($colour4, $mode);
 248   
 249          return $results;
 250      }
 251   
 252      /**
 253      */
 254      function mono_range($resource, $count = 5, $include_original = true)
 255      {
 256          if (is_array($resource))
 257          {
 258              $results = array();
 259              for ($i = 0, $size = sizeof($resource); $i < $size; ++$i)
 260              {
 261                  $results = array_merge($results, $this->mono_range($resource[$i], $count, $include_original));
 262              }
 263              return $results;
 264          }
 265   
 266          $mode = (in_array($this->mode, array('hsv', 'ahsv'), true) ? $this->mode : 'ahsv');
 267          if (($pre = $this->get_resource($resource)) !== false)
 268          {
 269              $resource = $pre;
 270          }
 271   
 272          $colour = $this->model_convert($this->colours[$resource], $this->mode, $mode);
 273   
 274          $results = array();
 275          if ($include_original)
 276          {
 277              $results[] = $resource;
 278              $count--;
 279          }
 280   
 281          // This is a hard problem. I chicken out and try to maintain readability at the cost of less randomness.
 282   
 283          while ($count > 0)
 284          {
 285              $colour[1] = ($colour[1] + mt_rand(40,60)) % 99;
 286              $colour[2] = ($colour[2] + mt_rand(40,60));
 287              $results[] = $this->allocate($colour, $mode);
 288              $count--;
 289          }
 290          return $results;
 291      }
 292   
 293      /**
 294      * Convert from one colour model to another
 295      */
 296      function model_convert($colour, $from_model, $to_model)
 297      {
 298          if ($from_model == $to_model)
 299          {
 300              return $colour;
 301          }
 302   
 303          switch ($to_model)
 304          {
 305              case 'hsv':
 306   
 307                  switch ($from_model)
 308                  {
 309                      case 'ahsv':
 310                          return $this->ah2h($colour);
 311                          break;
 312   
 313                      case 'rgb':
 314                          return $this->rgb2hsv($colour);
 315                          break;
 316                  }
 317                  break;
 318   
 319              case 'ahsv':
 320   
 321                  switch ($from_model)
 322                  {
 323                      case 'hsv':
 324                          return $this->h2ah($colour);
 325                          break;
 326   
 327                      case 'rgb':
 328                          return $this->h2ah($this->rgb2hsv($colour));
 329                          break;
 330                  }
 331                  break;
 332   
 333              case 'rgb':
 334                  switch ($from_model)
 335                  {
 336                      case 'hsv':
 337                          return $this->hsv2rgb($colour);
 338                          break;
 339   
 340                      case 'ahsv':
 341                          return $this->hsv2rgb($this->ah2h($colour));
 342                          break;
 343                  }
 344                  break;
 345          }
 346          return false;
 347      }
 348   
 349      /**
 350      * Slightly altered from wikipedia's algorithm
 351      */
 352      function hsv2rgb($hsv)
 353      {
 354          $this->normalize_hue($hsv[0]);
 355   
 356          $h = $hsv[0];
 357          $s = min(1, max(0, $hsv[1] / 100));
 358          $v = min(1, max(0, $hsv[2] / 100));
 359   
 360          // calculate hue sector
 361          $hi = floor($hsv[0] / 60);
 362   
 363          // calculate opposite colour
 364          $p = $v * (1 - $s);
 365   
 366          // calculate distance between hex vertices
 367          $f = ($h / 60) - $hi;
 368   
 369          // coming in or going out?
 370          if (!($hi & 1))
 371          {
 372              $f = 1 - $f;
 373          }
 374   
 375          // calculate adjacent colour
 376          $q = $v * (1 - ($f * $s));
 377   
 378          switch ($hi)
 379          {
 380              case 0:
 381                  $rgb = array($v, $q, $p);
 382                  break;
 383   
 384              case 1:
 385                  $rgb = array($q, $v, $p);
 386                  break;
 387   
 388              case 2:
 389                  $rgb = array($p, $v, $q);
 390                  break;
 391   
 392              case 3:
 393                  $rgb = array($p, $q, $v);
 394                  break;
 395   
 396              case 4:
 397                  $rgb = array($q, $p, $v);
 398                  break;
 399   
 400              case 5:
 401                  $rgb = array($v, $p, $q);
 402                  break;
 403   
 404              default:
 405                  return array(0, 0, 0);
 406                  break;
 407          }
 408   
 409          return array(255 * $rgb[0], 255 * $rgb[1], 255 * $rgb[2]);
 410      }
 411   
 412      /**
 413      * (more than) Slightly altered from wikipedia's algorithm
 414      */
 415      function rgb2hsv($rgb)
 416      {
 417          $r = min(255, max(0, $rgb[0]));
 418          $g = min(255, max(0, $rgb[1]));
 419          $b = min(255, max(0, $rgb[2]));
 420          $max = max($r, $g, $b);
 421          $min = min($r, $g, $b);
 422   
 423          $v = $max / 255;
 424          $s = (!$max) ? 0 : 1 - ($min / $max);
 425   
 426          // if max - min is 0, we want hue to be 0 anyway.
 427          $h = $max - $min;
 428   
 429          if ($h)
 430          {
 431              switch ($max)
 432              {
 433                  case $g:
 434                      $h = 120 + (60 * ($b - $r) / $h);
 435                      break;
 436   
 437                  case $b:
 438                      $h = 240 + (60 * ($r - $g) / $h);
 439                      break;
 440   
 441                  case $r:
 442                      $h = 360 + (60 * ($g - $b) / $h);
 443                      break;
 444              }
 445          }
 446          $this->normalize_hue($h);
 447   
 448          return array($h, $s * 100, $v * 100);
 449      }
 450   
 451      /**
 452      */
 453      function normalize_hue(&$hue)
 454      {
 455          $hue %= 360;
 456   
 457          if ($hue < 0)
 458          {
 459              $hue += 360;
 460          }
 461      }
 462   
 463      /**
 464      * Alternate hue to hue
 465      */
 466      function ah2h($ahue)
 467      {
 468          if (is_array($ahue))
 469          {
 470              $ahue[0] = $this->ah2h($ahue[0]);
 471              return $ahue;
 472          }
 473          $this->normalize_hue($ahue);
 474   
 475          // blue through red is already ok
 476          if ($ahue >= 240)
 477          {
 478              return $ahue;
 479          }
 480   
 481          // ahue green is at 180
 482          if ($ahue >= 180)
 483          {
 484              // return (240 - (2 * (240 - $ahue)));
 485              return (2 * $ahue) - 240; // equivalent
 486          }
 487   
 488          // ahue yellow is at 120   (RYB rather than RGB)
 489          if ($ahue >= 120)
 490          {
 491              return $ahue - 60;
 492          }
 493   
 494          return $ahue / 2;
 495      }
 496   
 497      /**
 498      * hue to Alternate hue
 499      */
 500      function h2ah($hue)
 501      {
 502          if (is_array($hue))
 503          {
 504              $hue[0] = $this->h2ah($hue[0]);
 505              return $hue;
 506          }
 507          $this->normalize_hue($hue);
 508   
 509          // blue through red is already ok
 510          if ($hue >= 240)
 511          {
 512              return $hue;
 513          }
 514          else if ($hue <= 60)
 515          {
 516              return $hue * 2;
 517          }
 518          else if ($hue <= 120)
 519          {
 520              return $hue + 60;
 521          }
 522          else
 523          {
 524              return ($hue + 240) / 2;
 525          }
 526      }
 527  }
 528   

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