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<?php |
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/** |
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* Class FinderPattern |
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* |
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* @created 17.01.2021 |
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* @author ZXing Authors |
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* @author Smiley <[email protected]> |
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* @copyright 2021 Smiley |
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* @license Apache-2.0 |
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*/ |
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namespace chillerlan\QRCode\Detector; |
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use function sqrt; |
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/** |
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* <p>Encapsulates a finder pattern, which are the three square patterns found in |
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* the corners of QR Codes. It also encapsulates a count of similar finder patterns, |
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* as a convenience to the finder's bookkeeping.</p> |
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* |
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* @author Sean Owen |
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*/ |
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final class FinderPattern extends ResultPoint{ |
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private int $count; |
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public function __construct(float $posX, float $posY, float $estimatedModuleSize, int $count = null){ |
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parent::__construct($posX, $posY, $estimatedModuleSize); |
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$this->count = $count ?? 1; |
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} |
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public function getCount():int{ |
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return $this->count; |
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} |
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/** |
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* @param \chillerlan\QRCode\Detector\FinderPattern $b second pattern |
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* |
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* @return float distance between two points |
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*/ |
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public function getDistance(FinderPattern $b):float{ |
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return self::distance($this->x, $this->y, $b->x, $b->y); |
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} |
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/** |
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* Get square of distance between a and b. |
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*/ |
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public function getSquaredDistance(FinderPattern $b):float{ |
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return self::squaredDistance($this->x, $this->y, $b->x, $b->y); |
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} |
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/** |
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* Combines this object's current estimate of a finder pattern position and module size |
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* with a new estimate. It returns a new {@code FinderPattern} containing a weighted average |
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* based on count. |
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*/ |
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public function combineEstimate(float $i, float $j, float $newModuleSize):FinderPattern{ |
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$combinedCount = $this->count + 1; |
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return new self( |
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($this->count * $this->x + $j) / $combinedCount, |
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($this->count * $this->y + $i) / $combinedCount, |
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($this->count * $this->estimatedModuleSize + $newModuleSize) / $combinedCount, |
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$combinedCount |
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); |
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} |
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private static function squaredDistance(float $aX, float $aY, float $bX, float $bY):float{ |
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$xDiff = $aX - $bX; |
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$yDiff = $aY - $bY; |
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return $xDiff * $xDiff + $yDiff * $yDiff; |
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} |
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public static function distance(float $aX, float $aY, float $bX, float $bY):float{ |
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return sqrt(self::squaredDistance($aX, $aY, $bX, $bY)); |
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} |
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} |
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chillerlan /
php-qrcode
