/**
* @param GridInterface $grid
* @param UnitComposition $unitComposition
* @param int|float $tickLength This is how much time passes per tick, in seconds.
*
* @throws EngineException
* @throws \Exception
*/
public function __construct(GridInterface $grid, UnitComposition $unitComposition, $tickLength = 1)
{
$this->grid = $grid;
$this->unitComposition = $unitComposition;
if ($tickLength instanceof Time) {
$this->tickLength = $tickLength;
} elseif (is_numeric($tickLength)) {
$this->tickLength = $this->unitComposition->getUnitClass(UnitComposition::TIME, $tickLength);
} else {
throw new EngineException('Invalid tick length.');
}
}
public function testMomentum()
{
$unit = new UnitComposition();
$momentum = $unit->getUnitClass(UnitComposition::MOMENTUM);
$mass = $unit->getUnitClass(UnitComposition::MASS);
$velocity = $unit->getUnitClass(UnitComposition::VELOCITY);
$momentum->preConvertedAdd(1);
$mass->preConvertedAdd(1);
$velocity->preConvertedAdd(1);
$this->assertInstanceOf('Samsara\\Newton\\Units\\Mass', PhysicsProvider::momentumCalcs($momentum, $velocity));
$this->assertInstanceOf('Samsara\\Newton\\Units\\Momentum', PhysicsProvider::momentumCalcs($mass, $velocity));
$this->assertInstanceOf('Samsara\\Newton\\Units\\Velocity', PhysicsProvider::momentumCalcs($momentum, $mass));
}
