/**
* Take an instance of any unit and attempt to divide by that unit after squaring it. This will pass
* responsibility to the UnitComposition class so that it can attempt to figure out what the resulting
* units should be.
*
* @param Quantity $quantity
* @param int $precision
* @return Quantity
* @throws \Exception
*/
public function divideBySquared(Quantity $quantity, $precision = 2)
{
return $this->unitCompClass->naiveMultiOpt([$this], [$quantity, $quantity], $precision);
}
/**
* Universal Gravitation Equation:
*
* A = (G m1 m2)/ r^2
*
* @param Mass[]|Acceleration[]|Length[] ...$quantities
* @return Mass|Acceleration|Length
* @throws \Exception
*/
public static function universalGravitation(...$quantities)
{
if (count($quantities) != 3) {
throw new \Exception('The Universal Gravitation Equation requires at least three given units to calculate something.');
}
$vals = [];
foreach ($quantities as $unit) {
if ($unit instanceof Mass) {
/** @var Mass */
$vals['mass'][] = $unit;
} elseif ($unit instanceof Length) {
/** @var Length */
$vals['length'] = $unit;
} elseif ($unit instanceof Acceleration) {
/** @var Acceleration */
$vals['acceleration'] = $unit;
} else {
throw new \Exception('Only Mass, Acceleration and Length valid units for the Universal Gravitation Equation.');
}
}
$gravitation = new Gravitation();
$unitComposition = new UnitComposition();
if (array_key_exists('mass', $vals) && count($vals['mass']) == 2) {
if (array_key_exists('length', $vals)) {
/** @return Acceleration */
return $unitComposition->naiveMultiOpt([$gravitation, $vals['mass'][0], $vals['mass'][1]], [$vals['length'], $vals['length']]);
} else {
/** @return Length */
return $gravitation->squareRoot([$vals['mass'][0], $vals['mass'][1]], [$vals['acceleration']]);
}
} else {
/** @return Mass */
return $unitComposition->naiveMultiOpt([$vals['acceleration'], $vals['length'], $vals['length']], [$gravitation, $vals['mass'][0]]);
}
}