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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <nick@popphp.org> |
| 8 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\Color\Color; |
| 16 | |
| 17 | use OutOfRangeException; |
| 18 | |
| 19 | /** |
| 20 | * Pop Color RGB color class |
| 21 | * |
| 22 | * @category Pop |
| 23 | * @package Pop\Color |
| 24 | * @author Nick Sagona, III <nick@popphp.org> |
| 25 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 26 | * @license https://www.popphp.org/license New BSD License |
| 27 | * @version 2.0.0 |
| 28 | */ |
| 29 | class Rgb extends AbstractColor |
| 30 | { |
| 31 | |
| 32 | /** |
| 33 | * R value |
| 34 | * @var int |
| 35 | */ |
| 36 | protected int $r = 0; |
| 37 | |
| 38 | /** |
| 39 | * G value |
| 40 | * @var int |
| 41 | */ |
| 42 | protected int $g = 0; |
| 43 | |
| 44 | /** |
| 45 | * B value |
| 46 | * @var int |
| 47 | */ |
| 48 | protected int $b = 0; |
| 49 | |
| 50 | /** |
| 51 | * Alpha value |
| 52 | * @var ?float |
| 53 | */ |
| 54 | protected ?float $a = null; |
| 55 | |
| 56 | /** |
| 57 | * Constructor |
| 58 | * |
| 59 | * Instantiate the CSS RGB color object |
| 60 | * |
| 61 | * @param int|string $r |
| 62 | * @param int|string $g |
| 63 | * @param int|string $b |
| 64 | * @param float|string|null $a |
| 65 | */ |
| 66 | public function __construct(int|string $r, int|string $g, int|string $b, float|string|null $a = null) |
| 67 | { |
| 68 | $this->setR($r); |
| 69 | $this->setG($g); |
| 70 | $this->setB($b); |
| 71 | if ($a !== null) { |
| 72 | $this->setA($a); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Set R value |
| 78 | * |
| 79 | * @param int|string $r |
| 80 | * @throws OutOfRangeException |
| 81 | * @return self |
| 82 | */ |
| 83 | public function setR(int|string $r): self |
| 84 | { |
| 85 | $r = (int)$r; |
| 86 | if (($r > 255) || ($r < 0)) { |
| 87 | throw new OutOfRangeException('Error: The value of $r must be between 0 and 255.'); |
| 88 | } |
| 89 | $this->r = $r; |
| 90 | return $this; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Set G value |
| 95 | * |
| 96 | * @param int|string $g |
| 97 | * @throws OutOfRangeException |
| 98 | * @return self |
| 99 | */ |
| 100 | public function setG(int|string $g): self |
| 101 | { |
| 102 | $g = (int)$g; |
| 103 | if (($g > 255) || ($g < 0)) { |
| 104 | throw new OutOfRangeException('Error: The value of $g must be between 0 and 255.'); |
| 105 | } |
| 106 | $this->g = $g; |
| 107 | return $this; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Set B value |
| 112 | * |
| 113 | * @param int|string $b |
| 114 | * @throws OutOfRangeException |
| 115 | * @return self |
| 116 | */ |
| 117 | public function setB(int|string $b): self |
| 118 | { |
| 119 | $b = (int)$b; |
| 120 | if (($b > 255) || ($b < 0)) { |
| 121 | throw new OutOfRangeException('Error: The value of $b must be between 0 and 255.'); |
| 122 | } |
| 123 | $this->b = $b; |
| 124 | return $this; |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Set A value |
| 129 | * |
| 130 | * @param float|string $a |
| 131 | * @throws OutOfRangeException |
| 132 | * @return self |
| 133 | */ |
| 134 | public function setA(float|string $a): self |
| 135 | { |
| 136 | $a = (float)$a; |
| 137 | if (($a > 1) || ($a < 0)) { |
| 138 | throw new OutOfRangeException('Error: The value of $l must be between 0 and 1.'); |
| 139 | } |
| 140 | $this->a = $a; |
| 141 | return $this; |
| 142 | } |
| 143 | |
| 144 | /** |
| 145 | * Get R value |
| 146 | * |
| 147 | * @return int |
| 148 | */ |
| 149 | public function getR(): int |
| 150 | { |
| 151 | return $this->r; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Get G value |
| 156 | * |
| 157 | * @return int |
| 158 | */ |
| 159 | public function getG(): int |
| 160 | { |
| 161 | return $this->g; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Get B value |
| 166 | * |
| 167 | * @return int |
| 168 | */ |
| 169 | public function getB(): int |
| 170 | { |
| 171 | return $this->b; |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * Get A value |
| 176 | * |
| 177 | * @return float|null |
| 178 | */ |
| 179 | public function getA(): float|null |
| 180 | { |
| 181 | return $this->a; |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Determine if the color object has an alpha value |
| 186 | * |
| 187 | * @return bool |
| 188 | */ |
| 189 | public function hasA(): bool |
| 190 | { |
| 191 | return ($this->a !== null); |
| 192 | } |
| 193 | |
| 194 | /** |
| 195 | * Determine if the color object has an alpha value (alias) |
| 196 | * |
| 197 | * @return bool |
| 198 | */ |
| 199 | public function hasAlpha(): bool |
| 200 | { |
| 201 | return ($this->a !== null); |
| 202 | } |
| 203 | |
| 204 | /** |
| 205 | * Convert to CMYK |
| 206 | * |
| 207 | * @return Cmyk |
| 208 | */ |
| 209 | public function toCmyk(): Cmyk |
| 210 | { |
| 211 | $K = 1; |
| 212 | |
| 213 | // Calculate CMY. |
| 214 | $cyan = 1 - ($this->r / 255); |
| 215 | $magenta = 1 - ($this->g / 255); |
| 216 | $yellow = 1 - ($this->b / 255); |
| 217 | |
| 218 | // Calculate K. |
| 219 | if ($cyan < $K) { |
| 220 | $K = $cyan; |
| 221 | } |
| 222 | if ($magenta < $K) { |
| 223 | $K = $magenta; |
| 224 | } |
| 225 | if ($yellow < $K) { |
| 226 | $K = $yellow; |
| 227 | } |
| 228 | |
| 229 | if ($K == 1) { |
| 230 | $cyan = 0; |
| 231 | $magenta = 0; |
| 232 | $yellow = 0; |
| 233 | } else { |
| 234 | $cyan = round((($cyan - $K) / (1 - $K)) * 100); |
| 235 | $magenta = round((($magenta - $K) / (1 - $K)) * 100); |
| 236 | $yellow = round((($yellow - $K) / (1 - $K)) * 100); |
| 237 | } |
| 238 | |
| 239 | $black = round($K * 100); |
| 240 | |
| 241 | return new Cmyk($cyan, $magenta, $yellow, $black); |
| 242 | } |
| 243 | |
| 244 | /** |
| 245 | * Convert to Gray |
| 246 | * |
| 247 | * @return Grayscale |
| 248 | */ |
| 249 | public function toGray(): Grayscale |
| 250 | { |
| 251 | return new Grayscale(floor(((floor(($this->r + $this->g + $this->b) / 3) / 255) * 100))); |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * Convert to HSL |
| 256 | * |
| 257 | * @return Hsl |
| 258 | */ |
| 259 | public function toHsl(): Hsl |
| 260 | { |
| 261 | $r = $this->getR(); |
| 262 | $g = $this->getG(); |
| 263 | $b = $this->getB(); |
| 264 | |
| 265 | $min = min($r, min($g, $b)); |
| 266 | $max = max($r, max($g, $b)); |
| 267 | $delta = $max - $min; |
| 268 | $h = 0; |
| 269 | |
| 270 | if ($delta > 0) { |
| 271 | if ($max == $r && $max != $g) $h += ($g - $b) / $delta; |
| 272 | if ($max == $g && $max != $b) $h += (2 + ($b - $r) / $delta); |
| 273 | if ($max == $b && $max != $r) $h += (4 + ($r - $g) / $delta); |
| 274 | $h /= 6; |
| 275 | if ($h < 0) { |
| 276 | $h += 1; |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | // Calculate the saturation and brightness. |
| 281 | $r = $this->getR() / 255; |
| 282 | $g = $this->getG() / 255; |
| 283 | $b = $this->getB() / 255; |
| 284 | |
| 285 | $max = max($r, $g, $b); |
| 286 | $min = min($r, $g, $b); |
| 287 | |
| 288 | $l = $max; |
| 289 | $d = $max - $min; |
| 290 | $s = ($d == 0) ? 0 : $d / $max; |
| 291 | |
| 292 | return new Hsl((int)round($h * 360), (int)round($s * 100), (int)round($l * 100), $this->a); |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * Convert to HSV |
| 297 | * |
| 298 | * @return Hsv |
| 299 | */ |
| 300 | public function toHsv(): Hsv |
| 301 | { |
| 302 | $r = $this->getR() / 255; |
| 303 | $g = $this->getG() / 255; |
| 304 | $b = $this->getB() / 255; |
| 305 | |
| 306 | $max = max($r, $g, $b); |
| 307 | $min = min($r, $g, $b); |
| 308 | $delta = $max - $min; |
| 309 | $h = 0; |
| 310 | |
| 311 | if ($delta > 0) { |
| 312 | if ($max == $r && $max != $g) $h += ($g - $b) / $delta; |
| 313 | if ($max == $g && $max != $b) $h += (2 + ($b - $r) / $delta); |
| 314 | if ($max == $b && $max != $r) $h += (4 + ($r - $g) / $delta); |
| 315 | $h /= 6; |
| 316 | if ($h < 0) { |
| 317 | $h += 1; |
| 318 | } |
| 319 | } |
| 320 | |
| 321 | $v = $max; |
| 322 | $s = ($max == 0) ? 0 : $delta / $max; |
| 323 | |
| 324 | return new Hsv((int)round($h * 360), (int)round($s * 100), (int)round($v * 100), $this->a); |
| 325 | } |
| 326 | |
| 327 | /** |
| 328 | * Convert to HSB |
| 329 | * |
| 330 | * @return Hsb |
| 331 | */ |
| 332 | public function toHsb(): Hsb |
| 333 | { |
| 334 | $r = $this->getR() / 255; |
| 335 | $g = $this->getG() / 255; |
| 336 | $b = $this->getB() / 255; |
| 337 | |
| 338 | $max = max($r, $g, $b); |
| 339 | $min = min($r, $g, $b); |
| 340 | $delta = $max - $min; |
| 341 | $h = 0; |
| 342 | |
| 343 | if ($delta > 0) { |
| 344 | if ($max == $r && $max != $g) $h += ($g - $b) / $delta; |
| 345 | if ($max == $g && $max != $b) $h += (2 + ($b - $r) / $delta); |
| 346 | if ($max == $b && $max != $r) $h += (4 + ($r - $g) / $delta); |
| 347 | $h /= 6; |
| 348 | if ($h < 0) { |
| 349 | $h += 1; |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | $brightness = $max; |
| 354 | $s = ($max == 0) ? 0 : $delta / $max; |
| 355 | |
| 356 | return new Hsb((int)round($h * 360), (int)round($s * 100), (int)round($brightness * 100), $this->a); |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * Convert to HWB |
| 361 | * |
| 362 | * @return Hwb |
| 363 | */ |
| 364 | public function toHwb(): Hwb |
| 365 | { |
| 366 | $r = $this->getR() / 255; |
| 367 | $g = $this->getG() / 255; |
| 368 | $b = $this->getB() / 255; |
| 369 | |
| 370 | $max = max($r, $g, $b); |
| 371 | $min = min($r, $g, $b); |
| 372 | $delta = $max - $min; |
| 373 | $h = 0; |
| 374 | |
| 375 | if ($delta > 0) { |
| 376 | if ($max == $r && $max != $g) $h += ($g - $b) / $delta; |
| 377 | if ($max == $g && $max != $b) $h += (2 + ($b - $r) / $delta); |
| 378 | if ($max == $b && $max != $r) $h += (4 + ($r - $g) / $delta); |
| 379 | $h /= 6; |
| 380 | if ($h < 0) { |
| 381 | $h += 1; |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | $white = $min; |
| 386 | $black = 1 - $max; |
| 387 | |
| 388 | return new Hwb((int)round($h * 360), (int)round($white * 100), (int)round($black * 100), $this->a); |
| 389 | } |
| 390 | |
| 391 | /** |
| 392 | * Convert to CIE Lab |
| 393 | * |
| 394 | * @return Lab |
| 395 | */ |
| 396 | public function toLab(): Lab |
| 397 | { |
| 398 | $xn = 0.9504559270516716; |
| 399 | $yn = 1.0; |
| 400 | $zn = 1.0890577507598784; |
| 401 | |
| 402 | $epsilon = 216 / 24389; |
| 403 | $kappa = 24389 / 27; |
| 404 | |
| 405 | $lr = self::linearize($this->r / 255); |
| 406 | $lg = self::linearize($this->g / 255); |
| 407 | $lb = self::linearize($this->b / 255); |
| 408 | |
| 409 | $x = 0.41239079926595934 * $lr + 0.357584339383878 * $lg + 0.1804807884018343 * $lb; |
| 410 | $y = 0.21263900587151027 * $lr + 0.715168678767756 * $lg + 0.07219231536073371 * $lb; |
| 411 | $z = 0.01933081871559182 * $lr + 0.11919477979462598 * $lg + 0.9505321522496607 * $lb; |
| 412 | |
| 413 | $fx = self::labF($x / $xn, $epsilon, $kappa); |
| 414 | $fy = self::labF($y / $yn, $epsilon, $kappa); |
| 415 | $fz = self::labF($z / $zn, $epsilon, $kappa); |
| 416 | |
| 417 | $L = (116 * $fy) - 16; |
| 418 | $A = 500 * ($fx - $fy); |
| 419 | $B = 200 * ($fy - $fz); |
| 420 | |
| 421 | return new Lab(round($L, 2), round($A, 2), round($B, 2), $this->a); |
| 422 | } |
| 423 | |
| 424 | /** |
| 425 | * Convert to CIE LCH |
| 426 | * |
| 427 | * @return Lch |
| 428 | */ |
| 429 | public function toLch(): Lch |
| 430 | { |
| 431 | return $this->toLab()->toLch(); |
| 432 | } |
| 433 | |
| 434 | /** |
| 435 | * Convert to Oklab |
| 436 | * |
| 437 | * @return Oklab |
| 438 | */ |
| 439 | public function toOklab(): Oklab |
| 440 | { |
| 441 | $lr = self::linearize($this->r / 255); |
| 442 | $lg = self::linearize($this->g / 255); |
| 443 | $lb = self::linearize($this->b / 255); |
| 444 | |
| 445 | $l = 0.4122214708 * $lr + 0.5363325363 * $lg + 0.0514459929 * $lb; |
| 446 | $m = 0.2119034982 * $lr + 0.6806995451 * $lg + 0.1073969566 * $lb; |
| 447 | $s = 0.0883024619 * $lr + 0.2817188376 * $lg + 0.6299787005 * $lb; |
| 448 | |
| 449 | $l_ = $l ** (1 / 3); |
| 450 | $m_ = $m ** (1 / 3); |
| 451 | $s_ = $s ** (1 / 3); |
| 452 | |
| 453 | $L = 0.2104542553 * $l_ + 0.7936177850 * $m_ - 0.0040720468 * $s_; |
| 454 | $A = 1.9779984951 * $l_ - 2.4285922050 * $m_ + 0.4505937099 * $s_; |
| 455 | $B = 0.0259040371 * $l_ + 0.7827717662 * $m_ - 0.8086757660 * $s_; |
| 456 | |
| 457 | return new Oklab(round($L, 4), round($A, 4), round($B, 4), $this->a); |
| 458 | } |
| 459 | |
| 460 | /** |
| 461 | * Convert to Oklch |
| 462 | * |
| 463 | * @return Oklch |
| 464 | */ |
| 465 | public function toOklch(): Oklch |
| 466 | { |
| 467 | return $this->toOklab()->toOklch(); |
| 468 | } |
| 469 | |
| 470 | /** |
| 471 | * CIE Lab f() nonlinearity |
| 472 | * |
| 473 | * @param float $t |
| 474 | * @param float $epsilon |
| 475 | * @param float $kappa |
| 476 | * @return float |
| 477 | */ |
| 478 | private static function labF(float $t, float $epsilon, float $kappa): float |
| 479 | { |
| 480 | return ($t > $epsilon) ? ($t ** (1 / 3)) : ((($kappa * $t) + 16) / 116); |
| 481 | } |
| 482 | |
| 483 | /** |
| 484 | * Convert to hex |
| 485 | * |
| 486 | * @return Hex |
| 487 | */ |
| 488 | public function toHex(): Hex |
| 489 | { |
| 490 | $hex = str_pad(dechex($this->r), 2, '0', STR_PAD_LEFT) . str_pad(dechex($this->g), 2, '0', STR_PAD_LEFT) . str_pad(dechex($this->b), 2, '0', STR_PAD_LEFT); |
| 491 | if ($this->a !== null) { |
| 492 | $hex .= str_pad(dechex((int)round($this->a * 255)), 2, '0', STR_PAD_LEFT); |
| 493 | } |
| 494 | return new Hex($hex); |
| 495 | } |
| 496 | |
| 497 | /** |
| 498 | * Convert a gamma-encoded sRGB channel value (0-1) to its linear-light equivalent |
| 499 | * |
| 500 | * @param float $value |
| 501 | * @return float |
| 502 | */ |
| 503 | public static function linearize(float $value): float |
| 504 | { |
| 505 | return ($value <= 0.04045) ? ($value / 12.92) : ((($value + 0.055) / 1.055) ** 2.4); |
| 506 | } |
| 507 | |
| 508 | /** |
| 509 | * Convert a linear-light sRGB channel value (0-1) back to its gamma-encoded equivalent |
| 510 | * |
| 511 | * @param float $value |
| 512 | * @return float |
| 513 | */ |
| 514 | public static function delinearize(float $value): float |
| 515 | { |
| 516 | if ($value == 0.0) { |
| 517 | return 0.0; |
| 518 | } |
| 519 | if ($value == 1.0) { |
| 520 | return 1.0; |
| 521 | } |
| 522 | return ($value <= 0.0031308) ? ($value * 12.92) : ((1.055 * ($value ** (1 / 2.4))) - 0.055); |
| 523 | } |
| 524 | |
| 525 | /** |
| 526 | * Convert to array |
| 527 | * |
| 528 | * @param bool $assoc |
| 529 | * @return array |
| 530 | */ |
| 531 | public function toArray(bool $assoc = true): array |
| 532 | { |
| 533 | $rgb = []; |
| 534 | |
| 535 | if ($assoc) { |
| 536 | $rgb['r'] = $this->r; |
| 537 | $rgb['g'] = $this->g; |
| 538 | $rgb['b'] = $this->b; |
| 539 | if ($this->a !== null) { |
| 540 | $rgb['a'] = $this->a; |
| 541 | } |
| 542 | } else { |
| 543 | $rgb[] = $this->r; |
| 544 | $rgb[] = $this->g; |
| 545 | $rgb[] = $this->b; |
| 546 | if ($this->a !== null) { |
| 547 | $rgb[] = $this->a; |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | return $rgb; |
| 552 | } |
| 553 | |
| 554 | /** |
| 555 | * Convert to readable string |
| 556 | * |
| 557 | * @param ?string $format |
| 558 | * @return string |
| 559 | */ |
| 560 | public function render(?string $format = null): string |
| 561 | { |
| 562 | return match ($format) { |
| 563 | self::COMMA => $this->r . ', ' . $this->g . ', ' . $this->b . (!empty($this->a) ? ', ' . $this->a : ''), |
| 564 | self::CSS => (($this->a !== null) ? 'rgba(' : 'rgb(') . implode(', ', $this->toArray()) . ')', |
| 565 | self::PERCENT => round(($this->r / 255), 2) . ' ' . round(($this->g / 255), 2) . ' ' . round(($this->b / 255), 2), |
| 566 | default => $this->r . ' ' . $this->g . ' ' . $this->b . (!empty($this->a) ? ' ' . $this->a : ''), |
| 567 | }; |
| 568 | } |
| 569 | |
| 570 | /** |
| 571 | * Return CSS-formatted string |
| 572 | * |
| 573 | * @return string |
| 574 | */ |
| 575 | public function __toString(): string |
| 576 | { |
| 577 | return $this->render(self::CSS); |
| 578 | } |
| 579 | |
| 580 | /** |
| 581 | * Get the valid channel names |
| 582 | * |
| 583 | * @return array |
| 584 | */ |
| 585 | protected function channels(): array |
| 586 | { |
| 587 | return ['r', 'g', 'b', 'a']; |
| 588 | } |
| 589 | |
| 590 | } |