Developer
<?php
/**
* This file is part of the Nette Framework (https://nette.org)
* Copyright (c) 2004 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Nette\Utils;
use Nette;
/**
* Represent RGB color (0..255) with opacity (0..1).
*/
class ImageColor
{
public static function rgb(int $red, int $green, int $blue, float $opacity = 1): self
{
return new self($red, $green, $blue, $opacity);
}
/**
* Accepts formats #RRGGBB, #RRGGBBAA, #RGB, #RGBA
*/
public static function hex(string $hex): self
{
$hex = ltrim($hex, '#');
$len = strlen($hex);
if ($len === 3 || $len === 4) {
return new self(
(int) hexdec($hex[0]) * 17,
(int) hexdec($hex[1]) * 17,
(int) hexdec($hex[2]) * 17,
(int) hexdec($hex[3] ?? 'F') * 17 / 255,
);
} elseif ($len === 6 || $len === 8) {
return new self(
(int) hexdec($hex[0] . $hex[1]),
(int) hexdec($hex[2] . $hex[3]),
(int) hexdec($hex[4] . $hex[5]),
(int) hexdec(($hex[6] ?? 'F') . ($hex[7] ?? 'F')) / 255,
);
} else {
throw new Nette\InvalidArgumentException('Invalid hex color format.');
}
}
private function __construct(
public int $red,
public int $green,
public int $blue,
public float $opacity = 1,
) {
$this->red = max(0, min(255, $red));
$this->green = max(0, min(255, $green));
$this->blue = max(0, min(255, $blue));
$this->opacity = max(0, min(1, $opacity));
}
public function toRGBA(): array
{
return [
max(0, min(255, $this->red)),
max(0, min(255, $this->green)),
max(0, min(255, $this->blue)),
max(0, min(127, (int) round(127 - $this->opacity * 127))),
];
}
}
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