function _color_rgb2hsl
_color_rgb2hsl($rgb)
Converts an RGB triplet to HSL.
File
- modules/color/color.module, line 792
- Allows users to change the color scheme of themes.
Code
function _color_rgb2hsl($rgb) { $r = $rgb[0]; $g = $rgb[1]; $b = $rgb[2]; $min = min($r, min($g, $b)); $max = max($r, max($g, $b)); $delta = $max - $min; $l = ($min + $max) / 2; $s = 0; if ($l > 0 && $l < 1) { $s = $delta / ($l < 0.5 ? (2 * $l) : (2 - 2 * $l)); } $h = 0; if ($delta > 0) { if ($max == $r && $max != $g) { $h += ($g - $b) / $delta; } if ($max == $g && $max != $b) { $h += (2 + ($b - $r) / $delta); } if ($max == $b && $max != $r) { $h += (4 + ($r - $g) / $delta); } $h /= 6; } return array($h, $s, $l); }
© 2001–2016 by the original authors
Licensed under the GNU General Public License, version 2 and later.
Drupal is a registered trademark of Dries Buytaert.
https://api.drupal.org/api/drupal/modules!color!color.module/function/_color_rgb2hsl/7.x