/**
* Adds another cartesian vector to this instance
*
* @param static $b
*/
public function add(Cartesian $b)
{
$this->x->add($b->x);
$this->y->add($b->y);
$this->z->add($b->z);
if ($this->vx) {
$this->vx->add($b->vx);
$this->vy->add($b->vy);
$this->vz->add($b->vz);
}
return $this;
}
/**
* Adds another velocity to this instance and returns a new instance with
* the sum.
*
* @param Velocity $b Velocity to add
*
* @return static Sum of the two velocity instances
*/
public function add(Velocity $b)
{
$dist = $this->dist->add($b->dist);
$velocity = new Velocity($dist, $this->time);
$velocity->format = $this->format;
return $velocity;
}
