/**
* Setups conversions with given precision.
*
*/
public static function setup()
{
if (self::$setup !== false) {
return;
}
self::$angle = array('rad' => ILess_Math::divide(1, ILess_Math::multiply('2', str_replace(',', '.', M_PI))), 'deg' => ILess_Math::divide(1, 360), 'grad' => ILess_Math::divide(1, 400), 'turn' => '1');
self::$length = array('m' => '1', 'cm' => '0.01', 'mm' => '0.001', 'in' => '0.0254', 'pt' => ILess_Math::divide('0.0254', '72'), 'pc' => ILess_Math::multiply(ILess_Math::divide('0.0254', '72'), '12'));
self::$setup = true;
}
/**
* Converts the $number to "real" number
*
* @param ILess_Node_Dimension|integer|float $number
* @return double
* @throws InvalidArgumentException
*/
public function number($number)
{
if ($number instanceof ILess_Node_Dimension) {
return $number->unit->is('%') ? ILess_Math::clean(ILess_Math::divide($number->value, '100')) : $number->value;
} elseif (is_numeric($number)) {
return $number;
} else {
throw new InvalidArgumentException(sprintf('Color functions take numbers as parameters. "%s" given.', gettype($number)));
}
}
/**
* Returns the luma
*
* @return integer
*/
public function getLuma()
{
if ($this->luma !== null) {
return $this->luma;
}
// Y = 0.2126 R + 0.7152 G + 0.0722 B
$r = ILess_Math::multiply('0.2126', ILess_Math::divide($this->rgb[0], 255));
$g = ILess_Math::multiply('0.7152', ILess_Math::divide($this->rgb[1], 255));
$b = ILess_Math::multiply('0.0722', ILess_Math::divide($this->rgb[2], 255));
$this->luma = ILess_Math::add(ILess_Math::add($r, $g), $b);
return $this->luma;
}
/**
* Converts to another unit
*
* @param array|string $conversions
* @return ILess_Node_Dimension
*/
public function convertTo($conversions)
{
$value = $this->value;
$unit = clone $this->unit;
if (is_string($conversions)) {
$derivedConversions = array();
foreach (ILess_UnitConversion::$groups as $i) {
if (isset(ILess_UnitConversion::${$i}[$conversions])) {
$derivedConversions = array($i => $conversions);
}
}
$conversions = $derivedConversions;
}
foreach ($conversions as $groupName => $targetUnit) {
$group = ILess_UnitConversion::${$groupName};
// numerator
for ($i = 0, $count = count($unit->numerator); $i < $count; $i++) {
$atomicUnit = $unit->numerator[$i];
if (is_object($atomicUnit)) {
continue;
}
if (!isset($group[$atomicUnit])) {
continue;
}
$value = ILess_Math::multiply($value, ILess_Math::divide($group[$atomicUnit], $group[$targetUnit]));
$unit->numerator[$i] = $targetUnit;
}
// denominator
for ($i = 0, $count = count($unit->denominator); $i < $count; $i++) {
$atomicUnit = $unit->denominator[$i];
if (!isset($group[$atomicUnit])) {
continue;
}
// $value = $value / ($group[$atomicUnit] / $group[$targetUnit]);
$value = ILess_Math::divide($value, ILess_Math::divide($group[$atomicUnit], $group[$targetUnit]));
$unit->denominator[$i] = $targetUnit;
}
}
$unit->cancel();
return new ILess_Node_Dimension($value, $unit);
}
