1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 | <?php /* csscolor.php Copyright 2004 Patrick Fitzgerald http://www.barelyfitz.com/projects/csscolor/ This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ define('CSS_COLOR_ERROR', 100); class CSS_Color { //================================================== //==PARAMETERS====================================== //================================================== // $this->bg = array of CSS color values // $this->bg[0] is the bg color // $this->bg['+1'..'+5'] are lighter colors // $this->bg['-1'..'-5'] are darker colors var $bg = array(); // $this->fg = array of foreground colors. // Each color corresponds to a background color. var $fg = array(); // brightDiff is the minimum brightness difference // between the background and the foreground. // Note: you should not change this directly, // instead use setBrightDiff() and getBrightDiff() var $minBrightDiff = 126; // colorDiff is the minimum color difference // between the background and the foreground. // Note: you should not change this directly, // instead use setColorDiff() and getColorDiff() var $minColorDiff = 500; //================================================== //==CONSTRUCTOR===================================== //================================================== function CSS_Color($bgHex, $fgHex='') { // This is the constructor method for the class, // which is called when a new object is created. // Initialize the palette $this->setPalette($bgHex, $fgHex); } //================================================== //==METHODS========================================= //================================================== //-------------------------------------------------- function setPalette($bgHex, $fgHex = '') { // Initialize the color palettes // If a foreground color was not specified, // just use the background color. if (!$fgHex) { $fgHex = $bgHex; } // Clear the existing palette $this->bg = array(); $this->fg = array(); // Make sure we got a valid hex value if (!$this->isHex($bgHex)) { $this->raiseError("background color '$bgHex' is not a hex color value", __FUNCTION__, __LINE__); return false; } // Set the bg color $this->bg[0] = $bgHex; $this->bg['+1'] = $this->lighten($bgHex, .85); $this->bg['+2'] = $this->lighten($bgHex, .75); $this->bg['+3'] = $this->lighten($bgHex, .5); $this->bg['+4'] = $this->lighten($bgHex, .25); $this->bg['+5'] = $this->lighten($bgHex, .1); $this->bg['-1'] = $this->darken($bgHex, .85); $this->bg['-2'] = $this->darken($bgHex, .75); $this->bg['-3'] = $this->darken($bgHex, .5); $this->bg['-4'] = $this->darken($bgHex, .25); $this->bg['-5'] = $this->darken($bgHex, .1); // Make sure we got a valid hex value if (!$this->isHex($fgHex)) { $this->raiseError("background color '$bgHex' is not a hex color value", __FUNCTION__, __LINE__); return false; } // Set up the foreground colors $this->fg[0] = $this->calcFG( $this->bg[0], $fgHex); $this->fg['+1'] = $this->calcFG( $this->bg['+1'], $fgHex); $this->fg['+2'] = $this->calcFG( $this->bg['+2'], $fgHex); $this->fg['+3'] = $this->calcFG( $this->bg['+3'], $fgHex); $this->fg['+4'] = $this->calcFG( $this->bg['+4'], $fgHex); $this->fg['+5'] = $this->calcFG( $this->bg['+5'], $fgHex); $this->fg['-1'] = $this->calcFG( $this->bg['-1'], $fgHex); $this->fg['-2'] = $this->calcFG( $this->bg['-2'], $fgHex); $this->fg['-3'] = $this->calcFG( $this->bg['-3'], $fgHex); $this->fg['-4'] = $this->calcFG( $this->bg['-4'], $fgHex); $this->fg['-5'] = $this->calcFG( $this->bg['-5'], $fgHex); } //-------------------------------------------------- function lighten($hex, $percent) { return $this->mix($hex, $percent, 255); } //-------------------------------------------------- function darken($hex, $percent) { return $this->mix($hex, $percent, 0); } //-------------------------------------------------- function mix($hex, $percent, $mask) { // Make sure inputs are valid if (!is_numeric($percent) || $percent < 0 || $percent > 1) { $this->raiseError("percent=$percent is not valid", __FUNCTION__, __LINE__); return false; } if (!is_int($mask) || $mask < 0 || $mask > 255) { $this->raiseError("mask=$mask is not valid", __FUNCTION__, __LINE__); return false; } $rgb = $this->hex2RGB($hex); if (!is_array($rgb)) { // hex2RGB will raise an error return false; } for ($i=0; $i<3; $i++) { $rgb[$i] = round($rgb[$i] * $percent) + round($mask * (1-$percent)); // In case rounding up causes us to go to 256 if ($rgb[$i] > 255) { $rgb[$i] = 255; } } return $this->RGB2Hex($rgb); } //-------------------------------------------------- function hex2RGB($hex) { // // Given a hex color (rrggbb or rgb), // returns an array (r, g, b) with decimal values // If $hex is not the correct format, // returns false. // // example: // $d = hex2RGB('#abc'); // if (!$d) { error } // Regexp for a valid hex digit $d = '[a-fA-F0-9]'; // Make sure $hex is valid if (preg_match("/^($d$d)($d$d)($d$d)\$/", $hex, $rgb)) { return array( hexdec($rgb[1]), hexdec($rgb[2]), hexdec($rgb[3]) ); } if (preg_match("/^($d)($d)($d)$/", $hex, $rgb)) { return array( hexdec($rgb[1] . $rgb[1]), hexdec($rgb[2] . $rgb[2]), hexdec($rgb[3] . $rgb[3]) ); } $this->raiseError("cannot convert hex '$hex' to RGB", __FUNCTION__, __LINE__); return false; } //-------------------------------------------------- function RGB2Hex($rgb) { // Given an array(rval,gval,bval) consisting of // decimal color values (0-255), returns a hex string // suitable for use with CSS. // Returns false if the input is not in the correct format. // Example: // $h = RGB2Hex(array(255,0,255)); // if (!$h) { error }; // Make sure the input is valid if(!$this->isRGB($rgb)) { $this->raiseError("RGB value is not valid", __FUNCTION__, __LINE__); return false; } $hex = ""; for($i=0; $i < 3; $i++) { // Convert the decimal digit to hex $hexDigit = dechex($rgb[$i]); // Add a leading zero if necessary if(strlen($hexDigit) == 1) { $hexDigit = "0" . $hexDigit; } // Append to the hex string $hex .= $hexDigit; } // Return the complete hex string return $hex; } //-------------------------------------------------- function isHex($hex) { // Returns true if $hex is a valid CSS hex color. // The "#" character at the start is optional. // Regexp for a valid hex digit $d = '[a-fA-F0-9]'; // Make sure $hex is valid if (preg_match("/^#?$d$d$d$d$d$d\$/", $hex) || preg_match("/^#?$d$d$d\$/", $hex)) { return true; } return false; } //-------------------------------------------------- function isRGB($rgb) { // Returns true if $rgb is an array with three valid // decimal color digits. if (!is_array($rgb) || count($rgb) != 3) { return false; } for($i=0; $i < 3; $i++) { // Get the decimal digit $dec = intval($rgb[$i]); // Make sure the decimal digit is between 0 and 255 if (!is_int($dec) || $dec < 0 || $dec > 255) { return false; } } return true; } //-------------------------------------------------- function calcFG($bgHex, $fgHex) { // Given a background color $bgHex and a foreground color $fgHex, // modifies the foreground color so it will have enough contrast // to be seen against the background color. // // The following parameters are used: // $this->minBrightDiff // $this->minColorDiff // Loop through brighter and darker versions // of the foreground color. // The numbers here represent the amount of // foreground color to mix with black and white. foreach (array(1, 0.75, 0.5, 0.25, 0) as $percent) { $darker = $this->darken($fgHex, $percent); $lighter = $this->lighten($fgHex, $percent); $darkerBrightDiff = $this->brightnessDiff($bgHex, $darker); $lighterBrightDiff = $this->brightnessDiff($bgHex, $lighter); if ($lighterBrightDiff > $darkerBrightDiff) { $newFG = $lighter; $newFGBrightDiff = $lighterBrightDiff; } else { $newFG = $darker; $newFGBrightDiff = $darkerBrightDiff; } $newFGColorDiff = $this->colorDiff($bgHex, $newFG); if ($newFGBrightDiff >= $this->minBrightDiff && $newFGColorDiff >= $this->minColorDiff) { break; } } return $newFG; } //-------------------------------------------------- function getMinBrightDiff() { return $this->minBrightDiff; } function setMinBrightDiff($b, $resetPalette = true) { $this |