82 lines
2.5 KiB
PHP
82 lines
2.5 KiB
PHP
<?php
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/*
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* Copyright 2007 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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namespace Zxing\Qrcode\Detector;
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use Zxing\ResultPoint;
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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 $estimatedModuleSize;
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private $count;
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function __construct($posX, $posY, $estimatedModuleSize, $count=1) {
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parent::__construct($posX, $posY);
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$this->estimatedModuleSize = $estimatedModuleSize;
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$this->count = $count;
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}
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public function getEstimatedModuleSize() {
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return $this->estimatedModuleSize;
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}
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function getCount() {
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return $this->count;
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}
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/*
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void incrementCount() {
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this.count++;
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}
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*/
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/**
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* <p>Determines if this finder pattern "about equals" a finder pattern at the stated
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* position and size -- meaning, it is at nearly the same center with nearly the same size.</p>
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*/
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function aboutEquals($moduleSize, $i, $j) {
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if (abs($i - $this->getY()) <= $moduleSize && abs($j - $this->getX()) <= $moduleSize) {
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$moduleSizeDiff = abs($moduleSize - $this->estimatedModuleSize);
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return $moduleSizeDiff <= 1.0 || $moduleSizeDiff <= $this->estimatedModuleSize;
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}
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return false;
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}
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/**
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* Combines this object's current estimate of a finder pattern position and module size
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* with a new estimate. It returns a new {@code FinderPattern} containing a weighted average
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* based on count.
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*/
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function combineEstimate($i, $j, $newModuleSize) {
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$combinedCount = $this->count + 1;
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$combinedX = ($this->count * $this->getX() + $j) / $combinedCount;
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$combinedY = ($this->count * $this->getY() + $i) / $combinedCount;
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$combinedModuleSize = ($this->count * $this->estimatedModuleSize + $newModuleSize) / $combinedCount;
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return new FinderPattern($combinedX, $combinedY, $combinedModuleSize, $combinedCount);
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}
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}
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