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93 lines
2.2 KiB
PHP
93 lines
2.2 KiB
PHP
<?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 <smiley@chillerlan.net>
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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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* 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.
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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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/**
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*
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*/
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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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/**
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*
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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 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 $newModuleSize):self{
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$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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/**
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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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/**
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*
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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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