/**
* Given a color, we determine which predefined color in `static::$_colors`best match.
*
* {{{
* use imageColor\util\Color;
* use MischiefCollective\ColorJizz\Formats\RGB;
*
* $red = new RGB(255, 128, 128);
* var_dump(Color::bestColor($red)); // light-red
* }}}
*
* @param Color $color
* @param array $options Array of optinos to overwrite:
* - `'threshold'`: Set minimum threshold for matching.
* @return string|false If no numbers are below the threshold, false will be returned.
*/
public static function bestColor(ColorJizz $color, array $options = array())
{
$options += array('threshold' => 30);
$min = 9999;
$bestColor = null;
static::updateColors();
foreach (static::$_colors as $key => $value) {
$tmin = $color->distance($value);
if ($min > $tmin) {
$bestColor = $key;
$min = $tmin;
}
}
return $min < $options['threshold'] ? $bestColor : false;
}
/**
* Find the distance to the destination color
*
* @param MischiefCollective\ColorJizz\ColorJizz $destinationColor The destination color
*
* @return int distance to destination color
*/
public function distance(ColorJizz $destinationColor)
{
$a = $this->toCIELab();
$b = $destinationColor->toCIELab();
$lightness_pow = pow($a->lightness - $b->lightness, 2);
$a_dimension_pow = pow($a->a_dimension - $b->a_dimension, 2);
$b_dimension_pow = pow($a->b_dimension - $b->b_dimension, 2);
return sqrt($lightness_pow + $a_dimension_pow + $b_dimension_pow);
}
