/**
* Subtracts the two given vectors from each other.
*
* @param Vector $lft The left vector.
* @param Vector $rgt The right vector.
* @return Vector
* @throws InvalidArgumentException Thrown when the given vector is of a different length.
*/
public static function subtract(Vector $lft, Vector $rgt)
{
if ($lft->getSize() != $rgt->getSize()) {
throw new InvalidArgumentException('Invalid vectors provided, should be of the same size.');
}
$vectorSize = $lft->getSize();
$result = new Vector($lft);
for ($i = 0; $i < $vectorSize; ++$i) {
$result[$i]->subtract($rgt[$i]);
}
return $result;
}
/**
* Subtracts the given vector from this vector.
*
* @param Vector $vector The vector to sutbract.
* @return Vector
* @throws InvalidArgumentException Thrown when the given vector is of a different length.
*/
public function subtract(Vector $vector)
{
if ($this->getSize() != $vector->getSize()) {
throw new InvalidArgumentException('Invalid vector provided, should be of the same size.');
}
foreach ($this as $index => $value) {
$this[$index]->subtract($vector[$index]);
}
return $this;
}
/**
* Initializes a new instance of this class.
*
* @param float $x The X-component to set.
* @param float $y The Y-component to set.
*/
public function __construct($x, $y)
{
parent::__construct(array());
$this->setX($x);
$this->setY($y);
}
/**
* @expectedException InvalidArgumentException
*/
public function testSubtractInvalid()
{
// Arrange
$vector1 = new Vector(array(1, 2, 3));
$vector2 = new Vector(array(1, 2, 3, 4));
// Act
$vector1->subtract($vector2);
}
