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<?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 $count;
public function __construct($posX, $posY, $estimatedModuleSize, $count = 1)
{
parent::__construct($posX, $posY);
$this->estimatedModuleSize = $estimatedModuleSize;
$this->count = $count;
}
public function getEstimatedModuleSize()
{
return $this->estimatedModuleSize;
}
public function getCount()
{
return $this->count;
}
/*
void incrementCount() {
this.count++;
}
*/
/**
* <p>Determines if this finder pattern "about equals" a finder pattern at the stated
* position and size -- meaning, it is at nearly the same center with nearly the same size.</p>
*/
public function aboutEquals($moduleSize, $i, $j)
{
if (abs($i - $this->getY()) <= $moduleSize && abs($j - $this->getX()) <= $moduleSize) {
$moduleSizeDiff = abs($moduleSize - $this->estimatedModuleSize);
return $moduleSizeDiff <= 1.0 || $moduleSizeDiff <= $this->estimatedModuleSize;
}
return false;
}
/**
* Combines this object's current estimate of a finder pattern position and module size
* with a new estimate. It returns a new {@code FinderPattern} containing a weighted average
* based on count.
*/
public function combineEstimate($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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