Detector::calculateModuleSize() - Code Metrics - chillerlan/php-qrcode - Measure and Improve Code Quality continuously with Scrutinizer

Detector::calculateModuleSize() A
last analyzed 2023-06-21 14:22 UTC

↳ Parent: Detector

Complexity

Conditions	2
Paths	2

Size

Total Lines	12
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	2
eloc	7
c	1
b	0
f	0
nc	2
nop	3
dl	0
loc	12
rs	10

<?php
/**
 * Class Detector
 *
 * @created      17.01.2021
 * @author       ZXing Authors
 * @author       Smiley <[email protected]>
 * @copyright    2021 Smiley
 * @license      Apache-2.0
 */

namespace chillerlan\QRCode\Detector;

use chillerlan\QRCode\Decoder\{Binarizer, LuminanceSourceInterface};
use chillerlan\QRCode\Common\Version;
use chillerlan\QRCode\Decoder\BitMatrix;
use function abs, is_nan, max, min, round;
use const NAN;

/**
 * Encapsulates logic that can detect a QR Code in an image, even if the QR Code
 * is rotated or skewed, or partially obscured.
 *
 * @author Sean Owen
 */
final class Detector{

	private BitMatrix $matrix;

	/**
	 * Detector constructor.
	 */
	public function __construct(LuminanceSourceInterface $source){
		$this->matrix = (new Binarizer($source))->getBlackMatrix();
	}

	/**
	 * Detects a QR Code in an image.
	 */
	public function detect():BitMatrix{
		[$bottomLeft, $topLeft, $topRight] = (new FinderPatternFinder($this->matrix))->find();

		$moduleSize         = $this->calculateModuleSize($topLeft, $topRight, $bottomLeft);
		$dimension          = $this->computeDimension($topLeft, $topRight, $bottomLeft, $moduleSize);
		$provisionalVersion = new Version((int)(($dimension - 17) / 4));
		$alignmentPattern   = null;

		// Anything above version 1 has an alignment pattern
		if(!empty($provisionalVersion->getAlignmentPattern())){
			// Guess where a "bottom right" finder pattern would have been
			$bottomRightX = ($topRight->getX() - $topLeft->getX() + $bottomLeft->getX());
			$bottomRightY = ($topRight->getY() - $topLeft->getY() + $bottomLeft->getY());

			// Estimate that alignment pattern is closer by 3 modules
			// from "bottom right" to known top left location
			$correctionToTopLeft = (1.0 - 3.0 / (float)($provisionalVersion->getDimension() - 7));
			$estAlignmentX       = (int)($topLeft->getX() + $correctionToTopLeft * ($bottomRightX - $topLeft->getX()));
			$estAlignmentY       = (int)($topLeft->getY() + $correctionToTopLeft * ($bottomRightY - $topLeft->getY()));

			// Kind of arbitrary -- expand search radius before giving up
			for($i = 4; $i <= 16; $i <<= 1){//??????????
				$alignmentPattern = $this->findAlignmentInRegion($moduleSize, $estAlignmentX, $estAlignmentY, (float)$i);

				if($alignmentPattern !== null){
					break;
				}
			}
			// If we didn't find alignment pattern... well try anyway without it
		}

		$transform = $this->createTransform($topLeft, $topRight, $bottomLeft, $dimension, $alignmentPattern);

		return (new GridSampler)->sampleGrid($this->matrix, $dimension, $transform);
	}

	/**
	 * Computes an average estimated module size based on estimated derived from the positions
	 * of the three finder patterns.
	 *
	 * @throws \chillerlan\QRCode\Detector\QRCodeDetectorException
	 */
	private function calculateModuleSize(FinderPattern $topLeft, FinderPattern $topRight, FinderPattern $bottomLeft):float{
		// Take the average
		$moduleSize = ((
			$this->calculateModuleSizeOneWay($topLeft, $topRight) +
			$this->calculateModuleSizeOneWay($topLeft, $bottomLeft)
		) / 2.0);

		if($moduleSize < 1.0){
			throw new QRCodeDetectorException('module size < 1.0');
		}

		return $moduleSize;
	}

	/**
	 * Estimates module size based on two finder patterns -- it uses
	 * #sizeOfBlackWhiteBlackRunBothWays(int, int, int, int) to figure the
	 * width of each, measuring along the axis between their centers.
	 */
	private function calculateModuleSizeOneWay(FinderPattern $a, FinderPattern $b):float{

		$moduleSizeEst1 = $this->sizeOfBlackWhiteBlackRunBothWays($a->getX(), $a->getY(), $b->getX(), $b->getY());
		$moduleSizeEst2 = $this->sizeOfBlackWhiteBlackRunBothWays($b->getX(), $b->getY(), $a->getX(), $a->getY());

		if(is_nan($moduleSizeEst1)){
			return ($moduleSizeEst2 / 7.0);
		}

		if(is_nan($moduleSizeEst2)){
			return ($moduleSizeEst1 / 7.0);
		}
		// Average them, and divide by 7 since we've counted the width of 3 black modules,
		// and 1 white and 1 black module on either side. Ergo, divide sum by 14.
		return (($moduleSizeEst1 + $moduleSizeEst2) / 14.0);
	}

	/**
	 * See #sizeOfBlackWhiteBlackRun(int, int, int, int); computes the total width of
	 * a finder pattern by looking for a black-white-black run from the center in the direction
	 * of another po$(another finder pattern center), and in the opposite direction too.
	 *
	 * @noinspection DuplicatedCode
	 */
	private function sizeOfBlackWhiteBlackRunBothWays(float $fromX, float $fromY, float $toX, float $toY):float{
		$result    = $this->sizeOfBlackWhiteBlackRun((int)$fromX, (int)$fromY, (int)$toX, (int)$toY);
		$dimension = $this->matrix->getSize();
		// Now count other way -- don't run off image though of course
		$scale     = 1.0;
		$otherToX  = ($fromX - ($toX - $fromX));

		if($otherToX < 0){
			$scale    = ($fromX / ($fromX - $otherToX));
			$otherToX = 0;
		}
		elseif($otherToX >= $dimension){
			$scale    = (($dimension - 1 - $fromX) / ($otherToX - $fromX));
			$otherToX = ($dimension - 1);
		}

		$otherToY = (int)($fromY - ($toY - $fromY) * $scale);
		$scale    = 1.0;

		if($otherToY < 0){
			$scale    = ($fromY / ($fromY - $otherToY));
			$otherToY = 0;
		}
		elseif($otherToY >= $dimension){
			$scale    = (($dimension - 1 - $fromY) / ($otherToY - $fromY));
			$otherToY = ($dimension - 1);
		}

		$otherToX = (int)($fromX + ($otherToX - $fromX) * $scale);
		$result   += $this->sizeOfBlackWhiteBlackRun((int)$fromX, (int)$fromY, $otherToX, $otherToY);

		// Middle pixel is double-counted this way; subtract 1
		return ($result - 1.0);
	}

	/**
	 * This method traces a line from a po$in the image, in the direction towards another point.
	 * It begins in a black region, and keeps going until it finds white, then black, then white again.
	 * It reports the distance from the start to this point.
	 *
	 * This is used when figuring out how wide a finder pattern is, when the finder pattern
	 * may be skewed or rotated.
	 */
	private function sizeOfBlackWhiteBlackRun(int $fromX, int $fromY, int $toX, int $toY):float{
		// Mild variant of Bresenham's algorithm;
		// @see https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
		$steep = abs($toY - $fromY) > abs($toX - $fromX);

		if($steep){
			$temp  = $fromX;
			$fromX = $fromY;
			$fromY = $temp;
			$temp  = $toX;
			$toX   = $toY;
			$toY   = $temp;
		}

		$dx    = abs($toX - $fromX);
		$dy    = abs($toY - $fromY);
		$error = (-$dx / 2);
		$xstep = (($fromX < $toX) ? 1 : -1);
		$ystep = (($fromY < $toY) ? 1 : -1);

		// In black pixels, looking for white, first or second time.
		$state  = 0;
		// Loop up until x == toX, but not beyond
		$xLimit = ($toX + $xstep);

		for($x = $fromX, $y = $fromY; $x !== $xLimit; $x += $xstep){
			$realX = ($steep) ? $y : $x;
			$realY = ($steep) ? $x : $y;

			// Does current pixel mean we have moved white to black or vice versa?
			// Scanning black in state 0,2 and white in state 1, so if we find the wrong
			// color, advance to next state or end if we are in state 2 already
			if(($state === 1) === $this->matrix->check($realX, $realY)){

				if($state === 2){
					return FinderPattern::distance($x, $y, $fromX, $fromY);
				}

				$state++;
			}

			$error += $dy;

			if($error > 0){

				if($y === $toY){
					break;
				}

				$y     += $ystep;
				$error -= $dx;
			}
		}

		// Found black-white-black; give the benefit of the doubt that the next pixel outside the image
		// is "white" so this last po$at (toX+xStep,toY) is the right ending. This is really a
		// small approximation; (toX+xStep,toY+yStep) might be really correct. Ignore this.
		if($state === 2){
			return FinderPattern::distance(($toX + $xstep), $toY, $fromX, $fromY);
		}

		// else we didn't find even black-white-black; no estimate is really possible
		return NAN;
	}

	/**
	 * Computes the dimension (number of modules on a size) of the QR Code based on the position
	 * of the finder patterns and estimated module size.
	 *
	 * @throws \chillerlan\QRCode\Detector\QRCodeDetectorException
	 */
	private function computeDimension(FinderPattern $nw, FinderPattern $ne, FinderPattern $sw, float $size):int{
		$tltrCentersDimension = (int)round($nw->getDistance($ne) / $size);
		$tlblCentersDimension = (int)round($nw->getDistance($sw) / $size);
		$dimension            = (int)((($tltrCentersDimension + $tlblCentersDimension) / 2) + 7);

		switch($dimension % 4){
			case 0:
				$dimension++;
				break;
			// 1? do nothing
			case 2:
				$dimension--;
				break;
			case 3:
				throw new QRCodeDetectorException('estimated dimension: '.$dimension);
		}

		if(($dimension % 4) !== 1){
			throw new QRCodeDetectorException('dimension mod 4 is not 1');
		}

		return $dimension;
	}

	/**
	 * Attempts to locate an alignment pattern in a limited region of the image, which is
	 * guessed to contain it.
	 *
	 * @param float $overallEstModuleSize estimated module size so far
	 * @param int   $estAlignmentX        x coordinate of center of area probably containing alignment pattern
	 * @param int   $estAlignmentY        y coordinate of above
	 * @param float $allowanceFactor      number of pixels in all directions to search from the center
	 *
	 * @return \chillerlan\QRCode\Detector\AlignmentPattern|null if found, or null otherwise
	 */
	private function findAlignmentInRegion(
		float $overallEstModuleSize,
		int $estAlignmentX,
		int $estAlignmentY,
		float $allowanceFactor
	):?AlignmentPattern{
		// Look for an alignment pattern (3 modules in size) around where it should be
		$dimension           = $this->matrix->getSize();
		$allowance           = (int)($allowanceFactor * $overallEstModuleSize);
		$alignmentAreaLeftX  = max(0, ($estAlignmentX - $allowance));
		$alignmentAreaRightX = min(($dimension - 1), ($estAlignmentX + $allowance));

		if(($alignmentAreaRightX - $alignmentAreaLeftX) < ($overallEstModuleSize * 3)){
			return null;
		}

		$alignmentAreaTopY    = max(0, ($estAlignmentY - $allowance));
		$alignmentAreaBottomY = min(($dimension - 1), ($estAlignmentY + $allowance));

		if(($alignmentAreaBottomY - $alignmentAreaTopY) < ($overallEstModuleSize * 3)){
			return null;
		}

		return (new AlignmentPatternFinder($this->matrix, $overallEstModuleSize))->find(
			$alignmentAreaLeftX,
			$alignmentAreaTopY,
			($alignmentAreaRightX - $alignmentAreaLeftX),
			($alignmentAreaBottomY - $alignmentAreaTopY),
		);
	}

	/**
	 *
	 */
	private function createTransform(
		FinderPattern    $nw,
		FinderPattern    $ne,
		FinderPattern    $sw,
		int              $size,
		AlignmentPattern $ap = null
	):PerspectiveTransform{
		$dimMinusThree = ($size - 3.5);

		if($ap instanceof AlignmentPattern){
			$bottomRightX       = $ap->getX();
			$bottomRightY       = $ap->getY();
			$sourceBottomRightX = ($dimMinusThree - 3.0);
			$sourceBottomRightY = $sourceBottomRightX;
		}
		else{
			// Don't have an alignment pattern, just make up the bottom-right point
			$bottomRightX       = ($ne->getX() - $nw->getX() + $sw->getX());
			$bottomRightY       = ($ne->getY() - $nw->getY() + $sw->getY());
			$sourceBottomRightX = $dimMinusThree;
			$sourceBottomRightY = $dimMinusThree;
		}

		return (new PerspectiveTransform)->quadrilateralToQuadrilateral(
			3.5,
			3.5,
			$dimMinusThree,
			3.5,
			$sourceBottomRightX,
			$sourceBottomRightY,
			3.5,
			$dimMinusThree,
			$nw->getX(),
			$nw->getY(),
			$ne->getX(),
			$ne->getY(),
			$bottomRightX,
			$bottomRightY,
			$sw->getX(),
			$sw->getY()
		);
	}

}


1			<?php
2			/**
3			* Class Detector
4			*
5			* @created 17.01.2021
6			* @author ZXing Authors
7			* @author Smiley <[email protected]>
8			* @copyright 2021 Smiley
9			* @license Apache-2.0
10			*/
11
12			namespace chillerlan\QRCode\Detector;
13
14			use chillerlan\QRCode\Decoder\{Binarizer, LuminanceSourceInterface};
15			use chillerlan\QRCode\Common\Version;
16			use chillerlan\QRCode\Decoder\BitMatrix;
17			use function abs, is_nan, max, min, round;
18			use const NAN;
19
20			/**
21			* Encapsulates logic that can detect a QR Code in an image, even if the QR Code
22			* is rotated or skewed, or partially obscured.
23			*
24			* @author Sean Owen
25			*/
26			final class Detector{
27
28			private BitMatrix $matrix;
29
30			/**
31			* Detector constructor.
32			*/
33			public function __construct(LuminanceSourceInterface $source){
34			$this->matrix = (new Binarizer($source))->getBlackMatrix();
35			}
36
37			/**
38			* Detects a QR Code in an image.
39			*/
40			public function detect():BitMatrix{
41			[$bottomLeft, $topLeft, $topRight] = (new FinderPatternFinder($this->matrix))->find();
42
43			$moduleSize = $this->calculateModuleSize($topLeft, $topRight, $bottomLeft);
44			$dimension = $this->computeDimension($topLeft, $topRight, $bottomLeft, $moduleSize);
45			$provisionalVersion = new Version((int)(($dimension - 17) / 4));
46			$alignmentPattern = null;
47
48			// Anything above version 1 has an alignment pattern
49			if(!empty($provisionalVersion->getAlignmentPattern())){
50			// Guess where a "bottom right" finder pattern would have been
51			$bottomRightX = ($topRight->getX() - $topLeft->getX() + $bottomLeft->getX());
52			$bottomRightY = ($topRight->getY() - $topLeft->getY() + $bottomLeft->getY());
53
54			// Estimate that alignment pattern is closer by 3 modules
55			// from "bottom right" to known top left location
56			$correctionToTopLeft = (1.0 - 3.0 / (float)($provisionalVersion->getDimension() - 7));
57			$estAlignmentX = (int)($topLeft->getX() + $correctionToTopLeft * ($bottomRightX - $topLeft->getX()));
58			$estAlignmentY = (int)($topLeft->getY() + $correctionToTopLeft * ($bottomRightY - $topLeft->getY()));
59
60			// Kind of arbitrary -- expand search radius before giving up
61			for($i = 4; $i <= 16; $i <<= 1){//??????????
62			$alignmentPattern = $this->findAlignmentInRegion($moduleSize, $estAlignmentX, $estAlignmentY, (float)$i);
63
64			if($alignmentPattern !== null){
65			break;
66			}
67			}
68			// If we didn't find alignment pattern... well try anyway without it
69			}
70
71			$transform = $this->createTransform($topLeft, $topRight, $bottomLeft, $dimension, $alignmentPattern);
72
73			return (new GridSampler)->sampleGrid($this->matrix, $dimension, $transform);
74			}
75
76			/**
77			* Computes an average estimated module size based on estimated derived from the positions
78			* of the three finder patterns.
79			*
80			* @throws \chillerlan\QRCode\Detector\QRCodeDetectorException
81			*/
82			private function calculateModuleSize(FinderPattern $topLeft, FinderPattern $topRight, FinderPattern $bottomLeft):float{
83			// Take the average
84			$moduleSize = ((
85			$this->calculateModuleSizeOneWay($topLeft, $topRight) +
86			$this->calculateModuleSizeOneWay($topLeft, $bottomLeft)
87			) / 2.0);
88
89			if($moduleSize < 1.0){
90			throw new QRCodeDetectorException('module size < 1.0');
91			}
92
93			return $moduleSize;
94			}
95
96			/**
97			* Estimates module size based on two finder patterns -- it uses
98			* #sizeOfBlackWhiteBlackRunBothWays(int, int, int, int) to figure the
99			* width of each, measuring along the axis between their centers.
100			*/
101			private function calculateModuleSizeOneWay(FinderPattern $a, FinderPattern $b):float{
102
103			$moduleSizeEst1 = $this->sizeOfBlackWhiteBlackRunBothWays($a->getX(), $a->getY(), $b->getX(), $b->getY());
104			$moduleSizeEst2 = $this->sizeOfBlackWhiteBlackRunBothWays($b->getX(), $b->getY(), $a->getX(), $a->getY());
105
106			if(is_nan($moduleSizeEst1)){
107			return ($moduleSizeEst2 / 7.0);
108			}
109
110			if(is_nan($moduleSizeEst2)){
111			return ($moduleSizeEst1 / 7.0);
112			}
113			// Average them, and divide by 7 since we've counted the width of 3 black modules,
114			// and 1 white and 1 black module on either side. Ergo, divide sum by 14.
115			return (($moduleSizeEst1 + $moduleSizeEst2) / 14.0);
116			}
117
118			/**
119			* See #sizeOfBlackWhiteBlackRun(int, int, int, int); computes the total width of
120			* a finder pattern by looking for a black-white-black run from the center in the direction
121			* of another po$(another finder pattern center), and in the opposite direction too.
122			*
123			* @noinspection DuplicatedCode
124			*/
125			private function sizeOfBlackWhiteBlackRunBothWays(float $fromX, float $fromY, float $toX, float $toY):float{
126			$result = $this->sizeOfBlackWhiteBlackRun((int)$fromX, (int)$fromY, (int)$toX, (int)$toY);
127			$dimension = $this->matrix->getSize();
128			// Now count other way -- don't run off image though of course
129			$scale = 1.0;
130			$otherToX = ($fromX - ($toX - $fromX));
131
132			if($otherToX < 0){
133			$scale = ($fromX / ($fromX - $otherToX));
134			$otherToX = 0;
135			}
136			elseif($otherToX >= $dimension){
137			$scale = (($dimension - 1 - $fromX) / ($otherToX - $fromX));
138			$otherToX = ($dimension - 1);
139			}
140
141			$otherToY = (int)($fromY - ($toY - $fromY) * $scale);
142			$scale = 1.0;
143
144			if($otherToY < 0){
145			$scale = ($fromY / ($fromY - $otherToY));
146			$otherToY = 0;
147			}
148			elseif($otherToY >= $dimension){
149			$scale = (($dimension - 1 - $fromY) / ($otherToY - $fromY));
150			$otherToY = ($dimension - 1);
151			}
152
153			$otherToX = (int)($fromX + ($otherToX - $fromX) * $scale);
154			$result += $this->sizeOfBlackWhiteBlackRun((int)$fromX, (int)$fromY, $otherToX, $otherToY);
155
156			// Middle pixel is double-counted this way; subtract 1
157			return ($result - 1.0);
158			}
159
160			/**
161			* This method traces a line from a po$in the image, in the direction towards another point.
162			* It begins in a black region, and keeps going until it finds white, then black, then white again.
163			* It reports the distance from the start to this point.
164			*
165			* This is used when figuring out how wide a finder pattern is, when the finder pattern
166			* may be skewed or rotated.
167			*/
168			private function sizeOfBlackWhiteBlackRun(int $fromX, int $fromY, int $toX, int $toY):float{
169			// Mild variant of Bresenham's algorithm;
170			// @see https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
171			$steep = abs($toY - $fromY) > abs($toX - $fromX);
172
173			if($steep){
174			$temp = $fromX;
175			$fromX = $fromY;
176			$fromY = $temp;
177			$temp = $toX;
178			$toX = $toY;
179			$toY = $temp;
180			}
181
182			$dx = abs($toX - $fromX);
183			$dy = abs($toY - $fromY);
184			$error = (-$dx / 2);
185			$xstep = (($fromX < $toX) ? 1 : -1);
186			$ystep = (($fromY < $toY) ? 1 : -1);
187
188			// In black pixels, looking for white, first or second time.
189			$state = 0;
190			// Loop up until x == toX, but not beyond
191			$xLimit = ($toX + $xstep);
192
193			for($x = $fromX, $y = $fromY; $x !== $xLimit; $x += $xstep){
194			$realX = ($steep) ? $y : $x;
195			$realY = ($steep) ? $x : $y;
196
197			// Does current pixel mean we have moved white to black or vice versa?
198			// Scanning black in state 0,2 and white in state 1, so if we find the wrong
199			// color, advance to next state or end if we are in state 2 already
200			if(($state === 1) === $this->matrix->check($realX, $realY)){
201
202			if($state === 2){
203			return FinderPattern::distance($x, $y, $fromX, $fromY);
204			}
205
206			$state++;
207			}
208
209			$error += $dy;
210
211			if($error > 0){
212
213			if($y === $toY){
214			break;
215			}
216
217			$y += $ystep;
218			$error -= $dx;
219			}
220			}
221
222			// Found black-white-black; give the benefit of the doubt that the next pixel outside the image
223			// is "white" so this last po$at (toX+xStep,toY) is the right ending. This is really a
224			// small approximation; (toX+xStep,toY+yStep) might be really correct. Ignore this.
225			if($state === 2){
226			return FinderPattern::distance(($toX + $xstep), $toY, $fromX, $fromY);
227			}
228
229			// else we didn't find even black-white-black; no estimate is really possible
230			return NAN;
231			}
232
233			/**
234			* Computes the dimension (number of modules on a size) of the QR Code based on the position
235			* of the finder patterns and estimated module size.
236			*
237			* @throws \chillerlan\QRCode\Detector\QRCodeDetectorException
238			*/
239			private function computeDimension(FinderPattern $nw, FinderPattern $ne, FinderPattern $sw, float $size):int{
240			$tltrCentersDimension = (int)round($nw->getDistance($ne) / $size);
241			$tlblCentersDimension = (int)round($nw->getDistance($sw) / $size);
242			$dimension = (int)((($tltrCentersDimension + $tlblCentersDimension) / 2) + 7);
243
244			switch($dimension % 4){
245			case 0:
246			$dimension++;
247			break;
248			// 1? do nothing
249			case 2:
250			$dimension--;
251			break;
252			case 3:
253			throw new QRCodeDetectorException('estimated dimension: '.$dimension);
254			}
255
256			if(($dimension % 4) !== 1){
257			throw new QRCodeDetectorException('dimension mod 4 is not 1');
258			}
259
260			return $dimension;
261			}
262
263			/**
264			* Attempts to locate an alignment pattern in a limited region of the image, which is
265			* guessed to contain it.
266			*
267			* @param float $overallEstModuleSize estimated module size so far
268			* @param int $estAlignmentX x coordinate of center of area probably containing alignment pattern
269			* @param int $estAlignmentY y coordinate of above
270			* @param float $allowanceFactor number of pixels in all directions to search from the center
271			*
272			* @return \chillerlan\QRCode\Detector\AlignmentPattern\|null if found, or null otherwise
273			*/
274			private function findAlignmentInRegion(
275			float $overallEstModuleSize,
276			int $estAlignmentX,
277			int $estAlignmentY,
278			float $allowanceFactor
279			):?AlignmentPattern{
280			// Look for an alignment pattern (3 modules in size) around where it should be
281			$dimension = $this->matrix->getSize();
282			$allowance = (int)($allowanceFactor * $overallEstModuleSize);
283			$alignmentAreaLeftX = max(0, ($estAlignmentX - $allowance));
284			$alignmentAreaRightX = min(($dimension - 1), ($estAlignmentX + $allowance));
285
286			if(($alignmentAreaRightX - $alignmentAreaLeftX) < ($overallEstModuleSize * 3)){
287			return null;
288			}
289
290			$alignmentAreaTopY = max(0, ($estAlignmentY - $allowance));
291			$alignmentAreaBottomY = min(($dimension - 1), ($estAlignmentY + $allowance));
292
293			if(($alignmentAreaBottomY - $alignmentAreaTopY) < ($overallEstModuleSize * 3)){
294			return null;
295			}
296
297			return (new AlignmentPatternFinder($this->matrix, $overallEstModuleSize))->find(
298			$alignmentAreaLeftX,
299			$alignmentAreaTopY,
300			($alignmentAreaRightX - $alignmentAreaLeftX),
301			($alignmentAreaBottomY - $alignmentAreaTopY),
302			);
303			}
304
305			/**
306			*
307			*/
308			private function createTransform(
309			FinderPattern $nw,
310			FinderPattern $ne,
311			FinderPattern $sw,
312			int $size,
313			AlignmentPattern $ap = null
314			):PerspectiveTransform{
315			$dimMinusThree = ($size - 3.5);
316
317			if($ap instanceof AlignmentPattern){
318			$bottomRightX = $ap->getX();
319			$bottomRightY = $ap->getY();
320			$sourceBottomRightX = ($dimMinusThree - 3.0);
321			$sourceBottomRightY = $sourceBottomRightX;
322			}
323			else{
324			// Don't have an alignment pattern, just make up the bottom-right point
325			$bottomRightX = ($ne->getX() - $nw->getX() + $sw->getX());
326			$bottomRightY = ($ne->getY() - $nw->getY() + $sw->getY());
327			$sourceBottomRightX = $dimMinusThree;
328			$sourceBottomRightY = $dimMinusThree;
329			}
330
331			return (new PerspectiveTransform)->quadrilateralToQuadrilateral(
332			3.5,
333			3.5,
334			$dimMinusThree,
335			3.5,
336			$sourceBottomRightX,
337			$sourceBottomRightY,
338			3.5,
339			$dimMinusThree,
340			$nw->getX(),
341			$nw->getY(),
342			$ne->getX(),
343			$ne->getY(),
344			$bottomRightX,
345			$bottomRightY,
346			$sw->getX(),
347			$sw->getY()
348			);
349			}
350
351			}
352

chillerlan / php-qrcode

Detector::calculateModuleSize() A last analyzed 2023-06-21 14:22 UTC

Complexity

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Duplication

Importance

Duplication Side-by-Side

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Detector::calculateModuleSize() A
last analyzed 2023-06-21 14:22 UTC