/**
* Get the provided color and return a darker one with the same hue
*/
static function darken_color($color, $power = 'medium')
{
$color_dec = Skrollr_Color_Tools::rgbhex2dec($color);
$hsl = Skrollr_Color_Tools::rgb2hsl($color_dec[0], $color_dec[1], $color_dec[2]);
if ($power == 'low') {
if ($hsl[2] < 0.5) {
$hsl[2] = $hsl[2] * 0.9;
} else {
$hsl[2] = $hsl[2] - 0.1;
}
} else {
if ($power == 'medium') {
if ($hsl[2] < 0.5) {
$hsl[2] = $hsl[2] * 0.5;
} else {
$hsl[2] = $hsl[2] - 0.25;
}
} else {
if ($power == 'strong') {
if ($hsl[2] < 0.5) {
$hsl[2] = $hsl[2] * 0.4;
} else {
$hsl[2] = $hsl[2] - 0.4;
}
}
}
}
if ($hsl[2] < 0) {
$hsl[2] = 0;
}
$darker = '#' . Skrollr_Color_Tools::hsl2rgb($hsl[0], $hsl[1], $hsl[2], 'hex');
return $darker;
}
