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<?php |
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/** |
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* Helper.php |
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* |
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* PHP version 5.4+ |
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* |
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* @author pgaultier |
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* @copyright 2010-2016 Ibitux |
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* @license http://www.ibitux.com/license license |
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* @version XXX |
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* @link http://www.ibitux.com |
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*/ |
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namespace sweelix\tree; |
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/** |
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* Helper class to ease node creation / management |
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* |
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* @author Philippe Gaultier <[email protected]> |
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* @copyright 2010-2016 Philippe Gaultier |
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* @license http://www.sweelix.net/license license |
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* @version XXX |
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* @link http://www.sweelix.net |
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* @package sweelix\tree |
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* @since XXX |
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*/ |
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class Helper |
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{ |
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// MatrixNode helpers |
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public static function buildMoveMatrix(Matrix $fromMatrix, Matrix $toMatrix, $bump = 0) |
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{ |
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$from = clone $fromMatrix; |
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$to = clone $toMatrix; |
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$from->adjugate(); |
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$from->multiply(-1); |
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$bumpMatrix = self::buildBumpMatrix($bump); |
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$to->multiply($bumpMatrix); |
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$to->multiply($from); |
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return $to; |
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} |
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/** |
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* @param string $path path in dot notation |
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* @return array matrix notation |
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* @since XXX |
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*/ |
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public static function convertPathToMatrix($path) |
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{ |
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$matrix = new Matrix([ |
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0, 1, |
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1, 0, |
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]); |
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$nodePath = explode('.', $path); |
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foreach ($nodePath as $segment) { |
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$matrix->multiply(self::buildSegmentMatrix($segment)); |
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} |
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return $matrix; |
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} |
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/** |
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* @param array $matrix path in matrix notation |
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* @return string dot notation |
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* @since XXX |
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*/ |
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public static function convertMatrixToPath(Matrix $matrix) |
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{ |
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$nodePath = []; |
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$currentMatrix = clone $matrix; |
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do { |
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$nodePath[] = self::getLastSegment($currentMatrix); |
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$currentMatrix = self::extractParentMatrixFromMatrix($currentMatrix); |
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} while ($currentMatrix !== null); |
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$nodePath = array_reverse($nodePath); |
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return implode('.', $nodePath); |
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} |
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/** |
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* Extract parent matrix from matrix. null if current matrix is root |
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* @param array $matrix |
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* @return array|null |
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* @since XXX |
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*/ |
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public static function extractParentMatrixFromMatrix(Matrix $matrix) |
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{ |
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$parentMatrix = null; |
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if (($matrix->c > 0) && ($matrix->d > 0)) { |
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$leafMatrix = self::buildSegmentMatrix(self::getLastSegment($matrix)); |
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$leafMatrix->inverse(); |
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$matrix->multiply($leafMatrix); |
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if ($matrix->a > 0) { |
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$parentMatrix = $matrix; |
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} |
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} |
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return $parentMatrix; |
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} |
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public static function getLastSegment($element) |
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{ |
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if ($element instanceof Matrix) { |
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$lastSegment = (int) ($element->a / ($element->b - $element->a)); |
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} else { |
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$path = explode('.', $element); |
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$lastSegment = end($path); |
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} |
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return $lastSegment; |
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} |
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public static function buildSegmentMatrix($segment) |
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{ |
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if ($segment <= 0) { |
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throw new InvalidSegmentException(); |
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} |
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return new Matrix([ |
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1, 1, |
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$segment, $segment + 1, |
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]); |
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} |
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public static function buildBumpMatrix($offset = 0) |
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{ |
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return new Matrix([ |
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1, 0, |
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$offset, 1, |
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]); |
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} |
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} |
pgaultier /
tree
