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<?php
/**
* File containing the ezcGraphVector class
*
* @package Graph
* @version //autogentag//
* @copyright Copyright (C) 2005-2008 eZ systems as. All rights reserved.
* @license http://ez.no/licenses/new_bsd New BSD License
* @access private
*/
/**
* Represents two dimensional vectors
*
* This class is internally used to represent vectors for geometric calculation
* in the two dimensional cartesian coordinate system.
*
* Vectors are an extension of the basic coordinate class, and add methods to
* calculate the length of a vector, perform various operations on angles, like
* rotations and the calculation of angles between two vectors.
*
* @version //autogentag//
* @package Graph
* @access private
*/
class ezcGraphVector extends ezcGraphCoordinate
{
/**
* Rotates vector to the left by 90 degrees
*
* @return void
*/
public function rotateCounterClockwise()
{
$tmp = $this->x;
$this->x = $this->y;
$this->y = -$tmp;
return $this;
}
/**
* Rotates vector to the right by 90 degrees
*
* @return void
*/
public function rotateClockwise()
{
$tmp = $this->x;
$this->x = -$this->y;
$this->y = $tmp;
return $this;
}
/**
* Unifies vector length to 1
*
* @return void
*/
public function unify()
{
$length = $this->length();
if ( $length == 0 )
{
return $this;
}
$this->x /= $length;
$this->y /= $length;
return $this;
}
/**
* Returns length of vector
*
* @return float
*/
public function length()
{
return sqrt(
pow( $this->x, 2 ) +
pow( $this->y, 2 )
);
}
/**
* Multiplies vector with a scalar
*
* @param float $value
* @return void
*/
public function scalar( $value )
{
$this->x *= $value;
$this->y *= $value;
return $this;
}
/**
* Calculates scalar product of two vectors
*
* @param ezcGraphCoordinate $vector
* @return void
*/
public function mul( ezcGraphCoordinate $vector )
{
return $this->x * $vector->x + $this->y * $vector->y;
}
/**
* Returns the angle between two vectors in radian
*
* @param ezcGraphCoordinate $vector
* @return float
*/
public function angle( ezcGraphCoordinate $vector )
{
if ( !$vector instanceof ezcGraphVector )
{
// Ensure beeing a vector for calling length()
$vector = ezcGraphVector::fromCoordinate( $vector );
}
$factor = $this->length() * $vector->length();
if ( $factor == 0 )
{
return false;
}
else
{
return acos( $this->mul( $vector ) / $factor );
}
}
/**
* Adds a vector to another vector
*
* @param ezcGraphCoordinate $vector
* @return void
*/
public function add( ezcGraphCoordinate $vector )
{
$this->x += $vector->x;
$this->y += $vector->y;
return $this;
}
/**
* Subtracts a vector from another vector
*
* @param ezcGraphCoordinate $vector
* @return void
*/
public function sub( ezcGraphCoordinate $vector )
{
$this->x -= $vector->x;
$this->y -= $vector->y;
return $this;
}
/**
* Creates a vector from a coordinate object
*
* @param ezcGraphCoordinate $coordinate
* @return ezcGraphVector
*/
public static function fromCoordinate( ezcGraphCoordinate $coordinate )
{
return new ezcGraphVector( $coordinate->x, $coordinate->y );
}
/**
* Transform vector using transformation matrix
*
* @param ezcGraphTransformation $transformation
* @return ezcGraphVector
*/
public function transform( ezcGraphTransformation $transformation )
{
$result = $transformation->transformCoordinate( $this );
$this->x = $result->x;
$this->y = $result->y;
return $this;
}
}
?>
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