<?php require "./vendor/nubs/vectorix/src/Vector.php"; use Nubs\Vectorix\Vector; $v = new Vector([2, 5]); $ary = $v->components(); print $ary[0] . " " . $ary[1] . "\n"; $w = $v->multiplyByScalar(3); $ary = $w->components(); print $ary[0] . " " . $ary[1] . "\n";
/**
* Verify that vector() returns the correct vector between a degenerate line
* segment.
*
* @test
* @uses \Nubs\Geometron\Point::__construct
* @uses \Nubs\Geometron\Point::vector
* @uses \Nubs\Geometron\Point::isSameSpace
* @uses \Nubs\Geometron\LineSegment::__construct
* @uses \Nubs\Geometron\LineSegment::a
* @uses \Nubs\Geometron\LineSegment::b
* @covers ::vector
*/
public function vectorOfDegenerateLineSegment()
{
$a = new Point(new Vector([1, 3]));
$b = new Point(new Vector([1, 3]));
$line = new LineSegment($a, $b);
$expected = new Vector([0, 0]);
$this->assertTrue($expected->isEqual($line->vector()));
}
/**
* Returns the angle between the two vectors.
*
* @api
* @param self $b The vector to compute the angle between.
* @return float The angle between the two vectors in radians.
* @throws Exception if either of the vectors are zero-length.
* @throws Exception if the vectors are not in the same vector space.
* @see self::_checkVectorSpace() For exception information.
*/
public function angleBetween(self $b)
{
$denominator = $this->length() * $b->length();
if ($denominator == 0) {
throw new Exception('Cannot divide by zero');
}
return acos($this->dotProduct($b) / $denominator);
}
/**
* Verify that the angle between vectors of differently keyed components
* fails.
*
* @test
* @uses \Nubs\Vectorix\Vector::__construct
* @uses \Nubs\Vectorix\Vector::components
* @uses \Nubs\Vectorix\Vector::dimension
* @uses \Nubs\Vectorix\Vector::isSameDimension
* @uses \Nubs\Vectorix\Vector::isSameVectorSpace
* @uses \Nubs\Vectorix\Vector::_checkVectorSpace
* @uses \Nubs\Vectorix\Vector::length
* @uses \Nubs\Vectorix\Vector::dotProduct
* @covers ::angleBetween
* @expectedException Exception
* @expectedExceptionMessage The vectors' components must have the same keys
*/
public function angleBetweenDifferentlyKeyedVectors()
{
$a = new Vector([2, 4]);
$b = new Vector(['x' => 3, 'y' => 7]);
$a->angleBetween($b);
}