protected function scale_color_helper($base, $scale, $i)
{
// 1,2,3 - rgb
// 4, 5, 6 - hsl
// 7 - a
switch ($i) {
case 1:
case 2:
case 3:
$max = 255;
break;
case 4:
$max = 360;
break;
case 7:
$max = 1;
break;
default:
$max = 100;
}
$scale = $scale / 100;
if ($scale < 0) {
return $base * $scale + $base;
} else {
return ($max - $base) * $scale + $base;
}
}