Encapsulates an alignment pattern, which are the smaller square patterns found in * all but the simplest QR Codes.

* * @author Sean Owen */ final class AlignmentPattern extends ResultPoint { private $estimatedModuleSize; public function __construct($posX, $posY, $estimatedModuleSize) { parent::__construct($posX, $posY); $this->estimatedModuleSize = $estimatedModuleSize; } /** *

Determines if this alignment pattern "about equals" an alignment pattern at the stated * position and size -- meaning, it is at nearly the same center with nearly the same size.

*/ public function aboutEquals($moduleSize, $i, $j) { if (abs($i - $this->getY()) <= $moduleSize && abs($j - $this->getX()) <= $moduleSize) { $moduleSizeDiff = abs($moduleSize - $this->estimatedModuleSize); return $moduleSizeDiff <= 1.0 || $moduleSizeDiff <= $this->estimatedModuleSize; } return false; } /** * Combines this object's current estimate of a finder pattern position and module size * with a new estimate. It returns a new {@code FinderPattern} containing an average of the two. */ public function combineEstimate($i, $j, $newModuleSize) { $combinedX = ($this->getX() + $j) / 2.0; $combinedY = ($this->getY() + $i) / 2.0; $combinedModuleSize = ($this->estimatedModuleSize + $newModuleSize) / 2.0; return new AlignmentPattern($combinedX, $combinedY, $combinedModuleSize); } }