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color2css.php
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color2css.php
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<?php
namespace xenocrat;
class color2css {
const COLOR2CSS_VERSION_MAJOR = 6;
const COLOR2CSS_VERSION_MINOR = 1;
const CSS_COLOR_TRANSPARENT = "#00000000";
const CSS_COLOR_BLACK = "#000000ff";
const CSS_COLOR_SILVER = "#c0c0c0ff";
const CSS_COLOR_GRAY = "#808080ff";
const CSS_COLOR_WHITE = "#ffffffff";
const CSS_COLOR_MAROON = "#800000ff";
const CSS_COLOR_RED = "#ff0000ff";
const CSS_COLOR_PURPLE = "#800080ff";
const CSS_COLOR_FUCHSIA = "#ff00ffff";
const CSS_COLOR_GREEN = "#008000ff";
const CSS_COLOR_LIME = "#00ff00ff";
const CSS_COLOR_OLIVE = "#808000ff";
const CSS_COLOR_YELLOW = "#ffff00ff";
const CSS_COLOR_NAVY = "#000080ff";
const CSS_COLOR_BLUE = "#0000ffff";
const CSS_COLOR_TEAL = "#008080ff";
const CSS_COLOR_AQUA = "#00ffffff";
const CSS_COLOR_ORANGE = "#ffa500ff";
const CSS_COLOR_ALICEBLUE = "#f0f8ffff";
const CSS_COLOR_ANTIQUEWHITE = "#faebd7ff";
const CSS_COLOR_AQUAMARINE = "#7fffd4ff";
const CSS_COLOR_AZURE = "#f0ffffff";
const CSS_COLOR_BEIGE = "#f5f5dcff";
const CSS_COLOR_BISQUE = "#ffe4c4ff";
const CSS_COLOR_BLANCHEDALMOND = "#ffebcdff";
const CSS_COLOR_BLUEVIOLET = "#8a2be2ff";
const CSS_COLOR_BROWN = "#a52a2aff";
const CSS_COLOR_BURLYWOOD = "#deb887ff";
const CSS_COLOR_CADETBLUE = "#5f9ea0ff";
const CSS_COLOR_CHARTREUSE = "#7fff00ff";
const CSS_COLOR_CHOCOLATE = "#d2691eff";
const CSS_COLOR_CORAL = "#ff7f50ff";
const CSS_COLOR_CORNFLOWERBLUE = "#6495edff";
const CSS_COLOR_CORNSILK = "#fff8dcff";
const CSS_COLOR_CRIMSON = "#dc143cff";
const CSS_COLOR_CYAN = "#00ffffff";
const CSS_COLOR_DARKBLUE = "#00008bff";
const CSS_COLOR_DARKCYAN = "#008b8bff";
const CSS_COLOR_DARKGOLDENROD = "#b8860bff";
const CSS_COLOR_DARKGRAY = "#a9a9a9ff";
const CSS_COLOR_DARKGREEN = "#006400ff";
const CSS_COLOR_DARKGREY = "#a9a9a9ff";
const CSS_COLOR_DARKKHAKI = "#bdb76bff";
const CSS_COLOR_DARKMAGENTA = "#8b008bff";
const CSS_COLOR_DARKOLIVEGREEN = "#556b2fff";
const CSS_COLOR_DARKORANGE = "#ff8c00ff";
const CSS_COLOR_DARKORCHID = "#9932ccff";
const CSS_COLOR_DARKRED = "#8b0000ff";
const CSS_COLOR_DARKSALMON = "#e9967aff";
const CSS_COLOR_DARKSEAGREEN = "#8fbc8fff";
const CSS_COLOR_DARKSLATEBLUE = "#483d8bff";
const CSS_COLOR_DARKSLATEGRAY = "#2f4f4fff";
const CSS_COLOR_DARKSLATEGREY = "#2f4f4fff";
const CSS_COLOR_DARKTURQUOISE = "#00ced1ff";
const CSS_COLOR_DARKVIOLET = "#9400d3ff";
const CSS_COLOR_DEEPPINK = "#ff1493ff";
const CSS_COLOR_DEEPSKYBLUE = "#00bfffff";
const CSS_COLOR_DIMGRAY = "#696969ff";
const CSS_COLOR_DIMGREY = "#696969ff";
const CSS_COLOR_DODGERBLUE = "#1e90ffff";
const CSS_COLOR_FIREBRICK = "#b22222ff";
const CSS_COLOR_FLORALWHITE = "#fffaf0ff";
const CSS_COLOR_FORESTGREEN = "#228b22ff";
const CSS_COLOR_GAINSBORO = "#dcdcdcff";
const CSS_COLOR_GHOSTWHITE = "#f8f8ffff";
const CSS_COLOR_GOLD = "#ffd700ff";
const CSS_COLOR_GOLDENROD = "#daa520ff";
const CSS_COLOR_GREENYELLOW = "#adff2fff";
const CSS_COLOR_GREY = "#808080ff";
const CSS_COLOR_HONEYDEW = "#f0fff0ff";
const CSS_COLOR_HOTPINK = "#ff69b4ff";
const CSS_COLOR_INDIANRED = "#cd5c5cff";
const CSS_COLOR_INDIGO = "#4b0082ff";
const CSS_COLOR_IVORY = "#fffff0ff";
const CSS_COLOR_KHAKI = "#f0e68cff";
const CSS_COLOR_LAVENDER = "#e6e6faff";
const CSS_COLOR_LAVENDERBLUSH = "#fff0f5ff";
const CSS_COLOR_LAWNGREEN = "#7cfc00ff";
const CSS_COLOR_LEMONCHIFFON = "#fffacdff";
const CSS_COLOR_LIGHTBLUE = "#add8e6ff";
const CSS_COLOR_LIGHTCORAL = "#f08080ff";
const CSS_COLOR_LIGHTCYAN = "#e0ffffff";
const CSS_COLOR_LIGHTGOLDENRODYELLOW = "#fafad2ff";
const CSS_COLOR_LIGHTGRAY = "#d3d3d3ff";
const CSS_COLOR_LIGHTGREEN = "#90ee90ff";
const CSS_COLOR_LIGHTGREY = "#d3d3d3ff";
const CSS_COLOR_LIGHTPINK = "#ffb6c1ff";
const CSS_COLOR_LIGHTSALMON = "#ffa07aff";
const CSS_COLOR_LIGHTSEAGREEN = "#20b2aaff";
const CSS_COLOR_LIGHTSKYBLUE = "#87cefaff";
const CSS_COLOR_LIGHTSLATEGRAY = "#778899ff";
const CSS_COLOR_LIGHTSLATEGREY = "#778899ff";
const CSS_COLOR_LIGHTSTEELBLUE = "#b0c4deff";
const CSS_COLOR_LIGHTYELLOW = "#ffffe0ff";
const CSS_COLOR_LIMEGREEN = "#32cd32ff";
const CSS_COLOR_LINEN = "#faf0e6ff";
const CSS_COLOR_MAGENTA = "#ff00ffff";
const CSS_COLOR_MEDIUMAQUAMARINE = "#66cdaaff";
const CSS_COLOR_MEDIUMBLUE = "#0000cdff";
const CSS_COLOR_MEDIUMORCHID = "#ba55d3ff";
const CSS_COLOR_MEDIUMPURPLE = "#9370dbff";
const CSS_COLOR_MEDIUMSEAGREEN = "#3cb371ff";
const CSS_COLOR_MEDIUMSLATEBLUE = "#7b68eeff";
const CSS_COLOR_MEDIUMSPRINGGREEN = "#00fa9aff";
const CSS_COLOR_MEDIUMTURQUOISE = "#48d1ccff";
const CSS_COLOR_MEDIUMVIOLETRED = "#c71585ff";
const CSS_COLOR_MIDNIGHTBLUE = "#191970ff";
const CSS_COLOR_MINTCREAM = "#f5fffaff";
const CSS_COLOR_MISTYROSE = "#ffe4e1ff";
const CSS_COLOR_MOCCASIN = "#ffe4b5ff";
const CSS_COLOR_NAVAJOWHITE = "#ffdeadff";
const CSS_COLOR_OLDLACE = "#fdf5e6ff";
const CSS_COLOR_OLIVEDRAB = "#6b8e23ff";
const CSS_COLOR_ORANGERED = "#ff4500ff";
const CSS_COLOR_ORCHID = "#da70d6ff";
const CSS_COLOR_PALEGOLDENROD = "#eee8aaff";
const CSS_COLOR_PALEGREEN = "#98fb98ff";
const CSS_COLOR_PALETURQUOISE = "#afeeeeff";
const CSS_COLOR_PALEVIOLETRED = "#db7093ff";
const CSS_COLOR_PAPAYAWHIP = "#ffefd5ff";
const CSS_COLOR_PEACHPUFF = "#ffdab9ff";
const CSS_COLOR_PERU = "#cd853fff";
const CSS_COLOR_PINK = "#ffc0cbff";
const CSS_COLOR_PLUM = "#dda0ddff";
const CSS_COLOR_POWDERBLUE = "#b0e0e6ff";
const CSS_COLOR_ROSYBROWN = "#bc8f8fff";
const CSS_COLOR_ROYALBLUE = "#4169e1ff";
const CSS_COLOR_SADDLEBROWN = "#8b4513ff";
const CSS_COLOR_SALMON = "#fa8072ff";
const CSS_COLOR_SANDYBROWN = "#f4a460ff";
const CSS_COLOR_SEAGREEN = "#2e8b57ff";
const CSS_COLOR_SEASHELL = "#fff5eeff";
const CSS_COLOR_SIENNA = "#a0522dff";
const CSS_COLOR_SKYBLUE = "#87ceebff";
const CSS_COLOR_SLATEBLUE = "#6a5acdff";
const CSS_COLOR_SLATEGRAY = "#708090ff";
const CSS_COLOR_SLATEGREY = "#708090ff";
const CSS_COLOR_SNOW = "#fffafaff";
const CSS_COLOR_SPRINGGREEN = "#00ff7fff";
const CSS_COLOR_STEELBLUE = "#4682b4ff";
const CSS_COLOR_TAN = "#d2b48cff";
const CSS_COLOR_THISTLE = "#d8bfd8ff";
const CSS_COLOR_TOMATO = "#ff6347ff";
const CSS_COLOR_TURQUOISE = "#40e0d0ff";
const CSS_COLOR_VIOLET = "#ee82eeff";
const CSS_COLOR_WHEAT = "#f5deb3ff";
const CSS_COLOR_WHITESMOKE = "#f5f5f5ff";
const CSS_COLOR_YELLOWGREEN = "#9acd32ff";
const CSS_COLOR_REBECCAPURPLE = "#663399ff";
const REGEX_NUM = "[+-]?[0-9]*\.?[0-9]+";
const REGEX_EXP = "[+-]?[0-9]*\.?[0-9]+[eE][0-9]+";
const REGEX_HEX = "[0-9a-fA-F]";
const REGEX_ANGLE = "(deg|grad|rad|turn)?";
const REGEX_NUM_HUE = self::REGEX_NUM.self::REGEX_ANGLE;
const REGEX_EXP_HUE = self::REGEX_EXP.self::REGEX_ANGLE;
const REGEX_RGB =
"/^rgba?\( *".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none)".
"( *\/ *(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none))?".
" *\)$/";
const REGEX_RGB_LEGACY =
"/^rgba?\( *".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?) *, *".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?) *, *".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?)".
"( *[,\/] *(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?))?".
" *\)$/";
const REGEX_HSL =
"/^hsla?\( *".
"(".self::REGEX_NUM_HUE."|".self::REGEX_EXP_HUE."|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none)".
"( *\/ *(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none))?".
" *\)$/";
const REGEX_HSL_LEGACY =
"/^hsla?\( *".
"(".self::REGEX_NUM_HUE."|".self::REGEX_EXP_HUE.") *, *".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?) *, *".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?)".
"( *[,\/] *(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?))?".
" *\)$/";
const REGEX_HWB =
"/^hwb\( *".
"(".self::REGEX_NUM_HUE."|".self::REGEX_EXP_HUE."|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none)".
"( *\/ *(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none))?".
" *\)$/";
const REGEX_LAB =
"/^lab\( *".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none)".
"( *\/ *(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none))?".
" *\)$/";
const REGEX_LCH =
"/^lch\( *".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM_HUE."|".self::REGEX_EXP_HUE."|none)".
"( *\/ *(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none))?".
"\)$/";
const REGEX_OKLAB =
"/^oklab\( *".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none)".
"( *\/ *(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none))?".
" *\)$/";
const REGEX_OKLCH =
"/^oklch\( *".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none) +".
"(".self::REGEX_NUM_HUE."|".self::REGEX_EXP_HUE."|none)".
"( *\/ *(".self::REGEX_NUM."%?|".self::REGEX_EXP."%?|none))?".
"\)$/";
const REGEX_HEX_SHORT =
"/^#".
"(".self::REGEX_HEX.")".
"(".self::REGEX_HEX.")".
"(".self::REGEX_HEX.")".
"(".self::REGEX_HEX.")?".
"$/";
const REGEX_HEX_LONG =
"/^#".
"(".self::REGEX_HEX."{2})".
"(".self::REGEX_HEX."{2})".
"(".self::REGEX_HEX."{2})".
"(".self::REGEX_HEX."{2})?".
"$/";
protected $rgb = array(
"r" => 0.0,
"g" => 0.0,
"b" => 0.0
);
protected $hsl = array(
"h" => 0.0,
"s" => 0.0,
"l" => 0.0
);
protected $hsv = array(
"h" => 0.0,
"s" => 0.0,
"v" => 0.0
);
protected $hwb = array(
"h" => 0.0,
"w" => 0.0,
"b" => 0.0
);
protected $lab = array(
"l" => 0.0,
"a" => 0.0,
"b" => 0.0
);
protected $lch = array(
"l" => 0.0,
"c" => 0.0,
"h" => 0.0
);
protected $oklab = array(
"l" => 0.0,
"a" => 0.0,
"b" => 0.0
);
protected $oklch = array(
"l" => 0.0,
"c" => 0.0,
"h" => 0.0
);
protected $alpha = 0.0;
public function __construct($color = "transparent") {
$args = func_get_args();
if (count($args) < 2) {
if ($color instanceof color2css)
return $this->take($color);
else
return $this->interpret($color);
}
if (count($args) < 3)
throw new \BadMethodCallException(
"Missing arguments in call to color constructor."
);
$this->red($args[0]);
$this->green($args[1]);
$this->blue($args[2]);
$this->alpha((count($args) == 4) ? $args[3] : 1.0);
}
public function list_keywords(): array {
$keywords = array();
$reflect = new \ReflectionClass(get_class($this));
$constants = $reflect->getConstants();
foreach ($constants as $key => $val) {
if (preg_match("/^CSS_COLOR_/", $key))
$keywords[strtolower(substr($key, 10))] = $val;
}
return $keywords;
}
public function rgb($str = null): string|bool {
if (isset($str))
return $this->interpret_rgb($str);
$r = $this->number_format($this->rgb["r"] * 255);
$g = $this->number_format($this->rgb["g"] * 255);
$b = $this->number_format($this->rgb["b"] * 255);
$p = $this->number_format($this->alpha * 100, 0);
return "rgb(".$r." ".$g." ".$b." / ".$p."%)";
}
public function hsl($str = null): string|bool {
if (isset($str))
return $this->interpret_hsl($str);
$h = $this->number_format($this->hsl["h"]);
$s = $this->number_format($this->hsl["s"] * 100);
$l = $this->number_format($this->hsl["l"] * 100);
$p = $this->number_format($this->alpha * 100, 0);
return "hsl(".$h." ".$s."% ".$l."% / ".$p."%)";
}
public function hwb($str = null): string|bool {
if (isset($str))
return $this->interpret_hwb($str);
$h = $this->number_format($this->hwb["h"]);
$w = $this->number_format($this->hwb["w"] * 100);
$b = $this->number_format($this->hwb["b"] * 100);
$p = $this->number_format($this->alpha * 100, 0);
return "hwb(".$h." ".$w."% ".$b."% / ".$p."%)";
}
public function lab($str = null): string|bool {
if (isset($str))
return $this->interpret_lab($str);
$l = $this->number_format($this->lab["l"]);
$a = $this->number_format($this->lab["a"]);
$b = $this->number_format($this->lab["b"]);
$p = $this->number_format($this->alpha * 100, 0);
return "lab(".$l." ".$a." ".$b." / ".$p."%)";
}
public function lch($str = null): string|bool {
if (isset($str))
return $this->interpret_lch($str);
$l = $this->number_format($this->lch["l"]);
$c = $this->number_format($this->lch["c"]);
$h = $this->number_format($this->lch["h"]);
$p = $this->number_format($this->alpha * 100, 0);
return "lch(".$l." ".$c." ".$h." / ".$p."%)";
}
public function oklab($str = null): string|bool {
if (isset($str))
return $this->interpret_oklab($str);
$l = $this->number_format($this->oklab["l"], 3);
$a = $this->number_format($this->oklab["a"], 3);
$b = $this->number_format($this->oklab["b"], 3);
$p = $this->number_format($this->alpha * 100, 0);
return "oklab(".$l." ".$a." ".$b." / ".$p."%)";
}
public function oklch($str = null): string|bool {
if (isset($str))
return $this->interpret_oklch($str);
$l = $this->number_format($this->oklch["l"], 3);
$c = $this->number_format($this->oklch["c"], 3);
$h = $this->number_format($this->oklch["h"], 1);
$p = $this->number_format($this->alpha * 100, 0);
return "oklch(".$l." ".$c." ".$h." / ".$p."%)";
}
public function hex($str = null): string|bool {
if (isset($str))
return $this->interpret_hex($str);
$r = (int) round($this->rgb["r"] * 255);
$g = (int) round($this->rgb["g"] * 255);
$b = (int) round($this->rgb["b"] * 255);
$r = str_pad(dechex($r), 2, "0", STR_PAD_LEFT);
$g = str_pad(dechex($g), 2, "0", STR_PAD_LEFT);
$b = str_pad(dechex($b), 2, "0", STR_PAD_LEFT);
return "#".$r.$g.$b;
}
public function hexa($str = null): string|bool {
if (isset($str))
return $this->interpret_hex($str);
$r = (int) round($this->rgb["r"] * 255);
$g = (int) round($this->rgb["g"] * 255);
$b = (int) round($this->rgb["b"] * 255);
$p = (int) round($this->alpha * 255);
$r = str_pad(dechex($r), 2, "0", STR_PAD_LEFT);
$g = str_pad(dechex($g), 2, "0", STR_PAD_LEFT);
$b = str_pad(dechex($b), 2, "0", STR_PAD_LEFT);
$p = str_pad(dechex($p), 2, "0", STR_PAD_LEFT);
return "#".$r.$g.$b.$p;
}
public function red($r = null): float|bool {
if (!isset($r))
return $this->rgb["r"];
if (!is_numeric($r) or $r < 0 or $r > 1)
throw new \RangeException(
"RGB red value must be in the range 0-1."
);
$this->rgb["r"] = (float) $r;
$hsl = $this->rgb2hsl($this->rgb);
if (is_nan($hsl["h"]))
$hsl["h"] = $this->hsl["h"];
$hwb = $this->rgb2hwb($this->rgb);
if (is_nan($hwb["h"]))
$hwb["h"] = $this->hwb["h"];
$hsv = $this->rgb2hsv($this->rgb);
if (is_nan($hsv["h"]))
$hsv["h"] = $this->hsv["h"];
$this->hsl = $hsl;
$this->hwb = $hwb;
$this->hsv = $hsv;
return true;
}
public function green($g = null): float|bool {
if (!isset($g))
return $this->rgb["g"];
if (!is_numeric($g) or $g < 0 or $g > 1)
throw new \RangeException(
"RGB green value must be in the range 0-1."
);
$this->rgb["g"] = (float) $g;
$hsl = $this->rgb2hsl($this->rgb);
if (is_nan($hsl["h"]))
$hsl["h"] = $this->hsl["h"];
$hwb = $this->rgb2hwb($this->rgb);
if (is_nan($hwb["h"]))
$hwb["h"] = $this->hwb["h"];
$hsv = $this->rgb2hsv($this->rgb);
if (is_nan($hsv["h"]))
$hsv["h"] = $this->hsv["h"];
$this->hsl = $hsl;
$this->hwb = $hwb;
$this->hsv = $hsv;
return true;
}
public function blue($b = null): float|bool {
if (!isset($b))
return $this->rgb["b"];
if (!is_numeric($b) or $b < 0 or $b > 1)
throw new \RangeException(
"RGB blue value must be in the range 0-1."
);
$this->rgb["b"] = (float) $b;
$hsl = $this->rgb2hsl($this->rgb);
if (is_nan($hsl["h"]))
$hsl["h"] = $this->hsl["h"];
$hwb = $this->rgb2hwb($this->rgb);
if (is_nan($hwb["h"]))
$hwb["h"] = $this->hwb["h"];
$hsv = $this->rgb2hsv($this->rgb);
if (is_nan($hsv["h"]))
$hsv["h"] = $this->hsv["h"];
$this->hsl = $hsl;
$this->hwb = $hwb;
$this->hsv = $hsv;
return true;
}
public function hue($h = null): float|bool {
if (!isset($h))
return $this->hsl["h"];
if (!is_numeric($h))
throw new \InvalidArgumentException(
"HSL hue value must be numeric."
);
if ($h > 360)
$h = $h % 360;
while ($h < 0)
$h = $h + 360;
$this->hsl["h"] = (float) $h;
$this->hsv["h"] = (float) $h;
$this->hwb["h"] = (float) $h;
$this->rgb = $this->hsl2rgb($this->hsl);
return true;
}
public function saturation($s = null): float|bool {
if (!isset($s))
return $this->hsl["s"];
if (!is_numeric($s) or $s < 0 or $s > 1)
throw new \RangeException(
"HSL saturation value must be in the range 0-1."
);
$this->hsl["s"] = (float) $s;
$this->hsv = $this->hsl2hsv($this->hsl);
$this->hwb = $this->hsv2hwb($this->hsv);
$this->rgb = $this->hsl2rgb($this->hsl);
return true;
}
public function lightness($l = null): float|bool {
if (!isset($l))
return $this->hsl["l"];
if (!is_numeric($l) or $l < 0 or $l > 1)
throw new \RangeException(
"HSL lightness value must be in the range 0-1."
);
$this->hsl["l"] = (float) $l;
$this->hsv = $this->hsl2hsv($this->hsl);
$this->hwb = $this->hsv2hwb($this->hsv);
$this->rgb = $this->hsl2rgb($this->hsl);
return true;
}
public function whiteness($w = null): float|bool {
if (!isset($w))
return $this->hwb["w"];
if (!is_numeric($w) or $w < 0 or $w > 1)
throw new \RangeException(
"HWB whiteness value must be in the range 0-1."
);
$this->hwb["w"] = (float) $w;
$this->hsv = $this->hwb2hsv($this->hwb);
$this->hsl = $this->hsv2hsl($this->hsv);
$this->rgb = $this->hwb2rgb($this->hwb);
return true;
}
public function blackness($d = null): float|bool {
if (!isset($d))
return $this->hwb["b"];
if (!is_numeric($d) or $d < 0 or $d > 1)
throw new \RangeException(
"HWB blackness value must be in the range 0-1."
);
$this->hwb["b"] = (float) $d;
$this->hsv = $this->hwb2hsv($this->hwb);
$this->hsl = $this->hsv2hsl($this->hsv);
$this->rgb = $this->hwb2rgb($this->hwb);
return true;
}
public function colorfulness($s = null): float|bool {
if (!isset($s))
return $this->hsv["s"];
if (!is_numeric($s) or $s < 0 or $s > 1)
throw new \RangeException(
"HSV colorfulness value must be in the range 0-1."
);
$this->hsv["s"] = (float) $s;
$this->hwb = $this->hsv2hwb($this->hsv);
$this->hsl = $this->hsv2hsl($this->hsv);
$this->rgb = $this->hwb2rgb($this->hwb);
return true;
}
public function brightness($v = null): float|bool {
if (!isset($v))
return $this->hsv["v"];
if (!is_numeric($v) or $v < 0 or $v > 1)
throw new \RangeException(
"HSV brightness value must be in the range 0-1."
);
$this->hsv["v"] = (float) $v;
$this->hwb = $this->hsv2hwb($this->hsv);
$this->hsl = $this->hsv2hsl($this->hsv);
$this->rgb = $this->hwb2rgb($this->hwb);
return true;
}
public function cie_l($l = null): float|bool {
if (!isset($l))
return $this->lab["l"];
if (!is_numeric($l) or $l < 0 or $l > 100)
throw new \RangeException(
"CIE lightness value must be in the range 0-100."
);
$this->lab["l"] = (float) $l;
$lch = $this->lab2lch($this->lab);
if (is_nan($lch["h"]))
$lch["h"] = $this->lch["h"];
$this->lch = $lch;
return true;
}
public function cie_a($a = null): float|bool {
if (!isset($a))
return $this->lab["a"];
if (!is_numeric($a))
throw new \InvalidArgumentException(
"CIE A axis value must be numeric."
);
$this->lab["a"] = (float) $a;
$lch = $this->lab2lch($this->lab);
if (is_nan($lch["h"]))
$lch["h"] = $this->lch["h"];
$this->lch = $lch;
return true;
}
public function cie_b($b = null): float|bool {
if (!isset($b))
return $this->lab["b"];
if (!is_numeric($b))
throw new \InvalidArgumentException(
"CIE B axis value must be numeric."
);
$this->lab["b"] = (float) $b;
$lch = $this->lab2lch($this->lab);
if (is_nan($lch["h"]))
$lch["h"] = $this->lch["h"];
$this->lch = $lch;
return true;
}
public function cie_c($c = null): float|bool {
if (!isset($c))
return $this->lch["c"];
if (!is_numeric($c) or $c < 0)
throw new \RangeException(
"CIE chroma value must be > 0."
);
$this->lch["c"] = (float) $c;
$this->lab = $this->lch2lab($this->lch);
return true;
}
public function cie_h($h = null): float|bool {
if (!isset($h))
return $this->lch["h"];
if (!is_numeric($h))
throw new \InvalidArgumentException(
"CIE hue value must be numeric."
);
if ($h > 360)
$h = $h % 360;
while ($h < 0)
$h = $h + 360;
$this->lch["h"] = (float) $h;
$this->lab = $this->lch2lab($this->lch);
return true;
}
public function ok_l($l = null): float|bool {
if (!isset($l))
return $this->oklab["l"];
if (!is_numeric($l) or $l < 0 or $l > 1)
throw new \RangeException(
"OK lightness value must be in the range 0-1."
);
$this->oklab["l"] = (float) $l;
$oklch = $this->oklab2oklch($this->oklab);
if (is_nan($oklch["h"]))
$oklch["h"] = $this->oklch["h"];
$this->oklch = $oklch;
return true;
}
public function ok_a($a = null): float|bool {
if (!isset($a))
return $this->oklab["a"];
if (!is_numeric($a))
throw new \InvalidArgumentException(
"OK A axis value must be numeric."
);
$this->oklab["a"] = (float) $a;
$oklch = $this->oklab2oklch($this->oklab);
if (is_nan($oklch["h"]))
$oklch["h"] = $this->oklch["h"];
$this->oklch = $oklch;
return true;
}
public function ok_b($b = null): float|bool {
if (!isset($b))
return $this->oklab["b"];
if (!is_numeric($b))
throw new \InvalidArgumentException(
"OK B axis value must be numeric."
);
$this->oklab["b"] = (float) $b;
$oklch = $this->oklab2oklch($this->oklab);
if (is_nan($oklch["h"]))
$oklch["h"] = $this->oklch["h"];
$this->oklch = $oklch;
return true;
}
public function ok_c($c = null): float|bool {
if (!isset($c))
return $this->oklch["c"];
if (!is_numeric($c) or $c < 0)
throw new \RangeException(
"OK chroma value must be > 0."
);
$this->oklch["c"] = (float) $c;
$this->oklab = $this->oklch2oklab($this->oklch);
return true;
}
public function ok_h($h = null): float|bool {
if (!isset($h))
return $this->oklch["h"];
if (!is_numeric($h))
throw new \InvalidArgumentException(
"OK hue value must be numeric."
);
if ($h > 360)
$h = $h % 360;
while ($h < 0)
$h = $h + 360;
$this->oklch["h"] = (float) $h;
$this->oklab = $this->oklch2oklab($this->oklch);
return true;
}
public function alpha($a = null): float|bool {
if (!isset($a))
return $this->alpha;
if (!is_numeric($a) or $a < 0 or $a > 1)
throw new \RangeException(
"Alpha value must be in the range 0-1."
);
$this->alpha = (float) $a;
return true;
}
public function keyword($str = null): string|bool {
if (isset($str))
return $this->interpret_keyword($str);
$reflect = new \ReflectionClass(get_class($this));
$constants = $reflect->getConstants();
$colors = array();
foreach ($constants as $key => $val) {
if (preg_match("/^CSS_COLOR_/", $key))
$colors[strtolower(substr($key, 10))] = $val;
}
$hexa = $this->hexa();
foreach ($colors as $name => $val) {
if ($hexa == $val)
return $name;
}
return false;
}
public static function contrast($color1, $color2): float {
if (!$color1 instanceof color2css)
throw new \InvalidArgumentException(
"Color 1 must be an instance of color2css."
);
if (!$color2 instanceof color2css)
throw new \InvalidArgumentException(
"Color 2 must be an instance of color2css."
);
$l1 = self::luminance($color1);
$l2 = self::luminance($color2);
$c = ($l1 > $l2) ?
($l1 + 0.05) / ($l2 + 0.05) :
($l2 + 0.05) / ($l1 + 0.05) ;
return (float) $c;
}
public static function luminance($color): float {
if (!$color instanceof color2css)
throw new \InvalidArgumentException(
"Color must be an instance of color2css."
);
$n = $color->red();
$r = ($n <= 0.03928) ?
$n / 12.92 :
(($n + 0.055) / 1.055) ** 2.4 ;
$n = $color->green();
$g = ($n <= 0.03928) ?
$n / 12.92 :
(($n + 0.055) / 1.055) ** 2.4 ;
$n = $color->blue();
$b = ($n <= 0.03928) ?
$n / 12.92 :
(($n + 0.055) / 1.055) ** 2.4 ;
$l = (0.2126 * $r) + (0.7152 * $g) + (0.0722 * $b);
return (float) $l;
}
protected function take($color): void {
$this->rgb = array(
"r" => $color->red(),
"g" => $color->green(),
"b" => $color->blue()
);
$this->hsl = array(
"h" => $color->hue(),
"s" => $color->saturation(),
"l" => $color->lightness()
);
$this->hsv = array(
"h" => $color->hue(),
"s" => $color->colorfulness(),
"v" => $color->brightness()
);
$this->hwb = array(
"h" => $color->hue(),
"w" => $color->whiteness(),
"b" => $color->blackness()
);
$this->lab = array(
"l" => $color->cie_l(),
"a" => $color->cie_a(),
"b" => $color->cie_b()
);
$this->lch = array(
"l" => $color->cie_l(),
"c" => $color->cie_c(),
"h" => $color->cie_h()
);
$this->oklab = array(
"l" => $color->ok_l(),
"a" => $color->ok_a(),
"b" => $color->ok_b()
);
$this->oklch = array(
"l" => $color->ok_l(),
"c" => $color->ok_c(),
"h" => $color->ok_h()
);
$this->alpha = $color->alpha();
}
protected function deg($str): float {
if (preg_match("/grad$/i", $str))
return (float) $str * 0.9;
if (preg_match("/rad$/i", $str))
return (float) $str * (180 / M_PI);
if (preg_match("/turn$/i", $str))
return (float) $str * 360;