NEW webportal v2

htdocs/core/lib/functions2.lib.php

@@ -2586,6 +2586,62 @@ function colorHexToRgb($hex, $alpha = false, $returnArray = false)
 	}
 }
 
+/**
+ * Color Hex to Hsl (used for style)
+ *
+ * @param	string 			$hex 			Color in hex
+ * @param	float|false 	$alpha 			0 to 1 to add alpha channel
+ * @param	bool 			$returnArray	true=return an array instead, false=return string
+ * @return	string|array					String or array
+ */
+function colorHexToHsl($hex, $alpha = false, $returnArray = false)
+{
+	$hex = str_replace('#', '', $hex);
+	$red = hexdec(substr($hex, 0, 2)) / 255;
+	$green = hexdec(substr($hex, 2, 2)) / 255;
+	$blue = hexdec(substr($hex, 4, 2)) / 255;
+
+	$cmin = min($red, $green, $blue);
+	$cmax = max($red, $green, $blue);
+	$delta = $cmax - $cmin;
+
+	if ($delta == 0) {
+		$hue = 0;
+	} elseif ($cmax === $red) {
+		$hue = (($green - $blue) / $delta);
+	} elseif ($cmax === $green) {
+		$hue = ($blue - $red) / $delta + 2;
+	} else {
+		$hue = ($red - $green) / $delta + 4;
+	}
+
+	$hue = round($hue * 60);
+	if ($hue < 0) {
+		$hue += 360;
+	}
+
+	$lightness = (($cmax + $cmin) / 2);
+	$saturation = $delta === 0 ? 0 : ($delta / (1 - abs(2 * $lightness - 1)));
+	if ($saturation < 0) {
+		$saturation += 1;
+	}
+
+	$lightness = round($lightness*100);
+	$saturation = round($saturation*100);
+
+	if ($returnArray) {
+		return array(
+			'h' => $hue,
+			'l' => $lightness,
+			's' => $saturation,
+			'a' => $alpha === false ? 1 : $alpha
+		);
+	} elseif ($alpha) {
+		return 'hsla('.$hue.', '.$saturation.', '.$lightness.' / '.$alpha.')';
+	} else {
+		return 'hsl('.$hue.', '.$saturation.', '.$lightness.')';
+	}
+}
 
 /**
  * Applies the Cartesian product algorithm to an array