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✏️ Editing: FinderPattern.php

<?php
/*
 * Copyright 2007 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace Zxing\Qrcode\Detector;

use  Zxing\ResultPoint;

/**
 * <p>Encapsulates a finder pattern, which are the three square patterns found in
 * the corners of QR Codes. It also encapsulates a count of similar finder patterns,
 * as a convenience to the finder's bookkeeping.</p>
 *
 * @author Sean Owen
 */
final class FinderPattern extends ResultPoint {

private $estimatedModuleSize;
private $count;

function __construct($posX, $posY, $estimatedModuleSize, $count=1) {
    parent::__construct($posX, $posY);
    $this->estimatedModuleSize = $estimatedModuleSize;
    $this->count = $count;
}

public function getEstimatedModuleSize() {
    return $this->estimatedModuleSize;
  }

function getCount() {
    return $this->count;
  }

/*
  void incrementCount() {
    this.count++;
  }
   */

/**
   * <p>Determines if this finder pattern "about equals" a finder pattern at the stated
   * position and size -- meaning, it is at nearly the same center with nearly the same size.</p>
   */
  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 a weighted average
   * based on count.
   */
  function combineEstimate($i, $j, $newModuleSize) {
    $combinedCount = $this->count + 1;
    $combinedX = ($this->count * $this->getX() + $j) / $combinedCount;
    $combinedY = ($this->count * $this->getY() + $i) / $combinedCount;
    $combinedModuleSize = ($this->count * $this->estimatedModuleSize + $newModuleSize) / $combinedCount;
    return new FinderPattern($combinedX, $combinedY, $combinedModuleSize, $combinedCount);
  }

}

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