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<?php
/**
* File containing the ezcGraphRotation class
*
* @package Graph
* @version //autogentag//
* @copyright Copyright (C) 2005-2010 eZ Systems AS. All rights reserved.
* @license http://ez.no/licenses/new_bsd New BSD License
* @access private
*/
/**
* Class to create rotation matrices from given rotation and center point
*
* Three dimensional matrices (3x3) may be used to specify transformation of
* points, vectors and complexer structures in a two dimensional cartesian
* coordinate system. For more details have a look here:
* http://en.wikipedia.org/wiki/Transformation_matrix
*
* This class implements a convenient interface to create matrixes to rotate
* elements. This matrix may be combined with other transformation matrices, as
* usual.
*
* @version //autogentag//
* @package Graph
* @access private
*/
class ezcGraphRotation extends ezcGraphTransformation
{
/**
* Rotation in degrees
*
* @var float
*/
protected $rotation;
/**
* Center point
*
* @var ezcGraphCoordinate
*/
protected $center;
/**
* Construct rotation matrix from rotation (in degrees) and optional
* center point.
*
* @param int $rotation
* @param ezcGraphCoordinate $center
* @return ezcGraphTransformation
*/
public function __construct( $rotation = 0, ezcGraphCoordinate $center = null )
{
$this->rotation = (float) $rotation;
if ( $center === null )
{
$this->center = new ezcGraphCoordinate( 0, 0 );
$clockwiseRotation = deg2rad( $rotation );
$rotationMatrixArray = array(
array( cos( $clockwiseRotation ), -sin( $clockwiseRotation ), 0 ),
array( sin( $clockwiseRotation ), cos( $clockwiseRotation ), 0 ),
array( 0, 0, 1 ),
);
return parent::__construct( $rotationMatrixArray );
}
parent::__construct();
$this->center = $center;
$this->multiply( new ezcGraphTranslation( $center->x, $center->y ) );
$this->multiply( new ezcGraphRotation( $rotation ) );
$this->multiply( new ezcGraphTranslation( -$center->x, -$center->y ) );
}
/**
* Return rotaion angle in degrees
*
* @return float
*/
public function getRotation()
{
return $this->rotation;
}
/**
* Return the center point of the current rotation
*
* @return ezcGraphCoordinate
*/
public function getCenter()
{
return $this->center;
}
}
?>
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