hsb to rgb

Voorbeeld:<?php
echo '<pre>';
var_dump(hsbToRgb(90, 100, 100));
echo '</pre>';
?>De functies:
<?php
/**
 * This function can round a float or number by $precision digitst, taking in account the digits before te decimal point.
 *
 * @param int|float $number The number that needs to be rounded
 * @param int $precision The number of digits to wich $number needs to be rounded.
 * @return float
 */
function significantRound($number, $precision) {
	if (!is_numeric($number)) {
		throw new InvalidArgumentException('Argument $number must be an number.');
	}
	if (!is_int($precision)) {
		throw new InvalidArgumentException('Argument $precision must be an integer.');
	}
	return round($number, $precision - strlen(floor($number)));
}
/**
 * This function converts an color defined in the HSB/HSV color space to the equivalent colordefinition in the RGB color space.
 *
 * @uses significantRound()
 * @param float|int $hue This parameter can be a integer or float between 0 and 360. Note that is makes no sense to pass through a float with more than three digits, because it is rounded at three digits.
 * @param float|int $saturation This parameter can be a integer or float between 0 and 100. Note that is makes no sense to pass through a float with more than three digits, because it is rounded at three digits.
 * @param float|int $brightness This paramater can be a integer or float between 0 and 100. Note that it makes no sense to pass through a float with more than trhee digits, because it is rounded at three digits.
 * @return array|boolean On succes, this function returns an array with elements 'red' 'green' and 'blue', containing integers with a range from 0 to 255. On failure this function returns false.
 */
function hsbToRgb($hue, $saturation, $brightness) {
	$hue = significantRound($hue, 3);
	if ($hue < 0 || $hue > 360) {
		throw new LengthException('Argument $hue is not a number between 0 and 360');
	}
	$hue = $hue == 360 ? 0 : $hue;
	$saturation = significantRound($saturation, 3);
	if ($saturation < 0 || $saturation > 100) {
		throw new LengthException('Argument $saturation is not a number between 0 and 100');
	}
	$brightness = significantRound($brightness, 3);
	if ($brightness < 0 || $brightness > 100) {
		throw new LengthException('Argument $brightness is not a number between 0 and 100.');
	}
	$hexBrightness = (int) round($brightness * 2.55);
	if ($saturation == 0) {
		return array('red' => $hexBrightness, 'green' => $hexBrightness, 'blue' => $hexBrightness);
	}
	$Hi = floor($hue / 60);
	$f = $hue / 60 - $Hi;
	$p = (int) round($brightness * (100 - $saturation) * .0255);
	$q = (int) round($brightness * (100 - $f * $saturation) * .0255);
	$t = (int) round($brightness * (100 - (1 - $f) * $saturation) * .0255);
	switch ($Hi) {
		case 0:
			return array('red' => $hexBrightness, 'green' => $t, 'blue' => $p);
		case 1:
			return array('red' => $q, 'green' => $hexBrightness, 'blue' => $p);
		case 2:
			return array('red' => $p, 'green' => $hexBrightness, 'blue' => $t);
		case 3:
			return array('red' => $p, 'green' => $q, 'blue' => $hexBrightness);
		case 4:
			return array('red' => $t, 'green' => $p, 'blue' => $hexBrightness);
		case 5:
			return array('red' => $hexBrightness, 'green' => $p, 'blue' => $q);
	}
	return false;
}
?>