Detector::sizeOfBlackWhiteBlackRun() - Code Metrics - Inspection of ":octocat: moved readme images" - chillerlan/php-qrcode - Measure and Improve Code Quality continuously with Scrutinizer

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by smiley

created 2021-11-18 11:49 UTC

Detector::sizeOfBlackWhiteBlackRun() F

↳ Parent: Detector

Complexity

Conditions	12
Paths	432

Size

Total Lines	63
Code Lines	31

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	12
eloc	31
c	1
b	0
f	0
nc	432
nop	4
dl	0
loc	63
rs	3.5888

How to fix Long Method Complexity

<?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 RuntimeException;
use chillerlan\QRCode\Common\Version;
use chillerlan\QRCode\Decoder\BitMatrix;
use function abs, is_nan, max, min, round;
use const NAN;

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

	private BitMatrix $bitMatrix;

	/**
	 * Detector constructor.
	 */
	public function __construct(BitMatrix $image){
		$this->bitMatrix = $image;
	}

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

		$moduleSize         = (float)$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->bitMatrix, $dimension, $transform);
	}

	/**
	 * <p>Computes an average estimated module size based on estimated derived from the positions
	 * of the three finder patterns.</p>
	 *
	 * @throws \RuntimeException
	 */
	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 RuntimeException('module size < 1.0');
		}

		return $moduleSize;
	}

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

		$moduleSizeEst1 = $this->sizeOfBlackWhiteBlackRunBothWays(
			$pattern->getX(),
			$pattern->getY(),
			$otherPattern->getX(),
			$otherPattern->getY()
		);

		$moduleSizeEst2 = $this->sizeOfBlackWhiteBlackRunBothWays(
			$otherPattern->getX(),
			$otherPattern->getY(),
			$pattern->getX(),
			$pattern->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 {@link #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.</p>
	 */
	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->bitMatrix->getDimension();
		// 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)$fromY, (int)$otherToX, (int)$otherToY);

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

	/**
	 * <p>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.</p>
	 *
	 * <p>This is used when figuring out how wide a finder pattern is, when the finder pattern
	 * may be skewed or rotated.</p>
	 */
	private function sizeOfBlackWhiteBlackRun(int $fromX, int $fromY, int $toX, int $toY):float{
		// Mild variant of Bresenham's algorithm;
		// see http://en.wikipedia.org/wiki/Bresenham's_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) === $this->bitMatrix->get($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;
	}

	/**
	 * <p>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.</p>
	 *
	 * @throws \RuntimeException
	 */
	private function computeDimension(
		FinderPattern $topLeft,
		FinderPattern $topRight,
		FinderPattern $bottomLeft,
		float $moduleSize
	):int{
		$tltrCentersDimension = (int)round($topLeft->getDistance($topRight) / $moduleSize);
		$tlblCentersDimension = (int)round($topLeft->getDistance($bottomLeft) / $moduleSize);
		$dimension            = (int)((($tltrCentersDimension + $tlblCentersDimension) / 2) + 7);

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

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

		return $dimension;
	}

	/**
	 * <p>Attempts to locate an alignment pattern in a limited region of the image, which is
	 * guessed to contain it.</p>
	 *
	 * @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->bitMatrix->getDimension();
		$allowance           = (int)($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->bitMatrix, $overallEstModuleSize))->find(
			$alignmentAreaLeftX,
			$alignmentAreaTopY,
			$alignmentAreaRightX - $alignmentAreaLeftX,
			$alignmentAreaBottomY - $alignmentAreaTopY,
		);
	}

	/**
	 *
	 */
	private function createTransform(
		FinderPattern $topLeft,
		FinderPattern $topRight,
		FinderPattern $bottomLeft,
		int $dimension,
		AlignmentPattern $alignmentPattern = null
	):PerspectiveTransform{
		$dimMinusThree = (float)$dimension - 3.5;

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

		return (new PerspectiveTransform)->quadrilateralToQuadrilateral(
			3.5, 3.5,
			$dimMinusThree, 3.5,
			$sourceBottomRightX, $sourceBottomRightY,
			3.5, $dimMinusThree,
			$topLeft->getX(), $topLeft->getY(),
			$topRight->getX(), $topRight->getY(),
			$bottomRightX, $bottomRightY,
			$bottomLeft->getX(), $bottomLeft->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 RuntimeException;
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			* <p>Encapsulates logic that can detect a QR Code in an image, even if the QR Code
22			* is rotated or skewed, or partially obscured.</p>
23			*
24			* @author Sean Owen
25			*/
26			final class Detector{
27
28			private BitMatrix $bitMatrix;
29
30			/**
31			* Detector constructor.
32			*/
33			public function __construct(BitMatrix $image){
34			$this->bitMatrix = $image;
35			}
36
37			/**
38			* <p>Detects a QR Code in an image.</p>
39			*/
40			public function detect():BitMatrix{
41			[$bottomLeft, $topLeft, $topRight] = (new FinderPatternFinder($this->bitMatrix))->find();
42
43			$moduleSize = (float)$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->bitMatrix, $dimension, $transform);
74			}
75
76			/**
77			* <p>Computes an average estimated module size based on estimated derived from the positions
78			* of the three finder patterns.</p>
79			*
80			* @throws \RuntimeException
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 RuntimeException('module size < 1.0');
91			}
92
93			return $moduleSize;
94			}
95
96			/**
97			* <p>Estimates module size based on two finder patterns -- it uses
98			* {@link #sizeOfBlackWhiteBlackRunBothWays(int, int, int, int)} to figure the
99			* width of each, measuring along the axis between their centers.</p>
100			*/
101			private function calculateModuleSizeOneWay(FinderPattern $pattern, FinderPattern $otherPattern):float{
102
103			$moduleSizeEst1 = $this->sizeOfBlackWhiteBlackRunBothWays(
104			$pattern->getX(),
105			$pattern->getY(),
106			$otherPattern->getX(),
107			$otherPattern->getY()
108			);
109
110			$moduleSizeEst2 = $this->sizeOfBlackWhiteBlackRunBothWays(
111			$otherPattern->getX(),
112			$otherPattern->getY(),
113			$pattern->getX(),
114			$pattern->getY()
115			);
116
117			if(is_nan($moduleSizeEst1)){
118			return $moduleSizeEst2 / 7.0;
119			}
120
121			if(is_nan($moduleSizeEst2)){
122			return $moduleSizeEst1 / 7.0;
123			}
124			// Average them, and divide by 7 since we've counted the width of 3 black modules,
125			// and 1 white and 1 black module on either side. Ergo, divide sum by 14.
126			return ($moduleSizeEst1 + $moduleSizeEst2) / 14.0;
127			}
128
129			/**
130			* See {@link #sizeOfBlackWhiteBlackRun(int, int, int, int)}; computes the total width of
131			* a finder pattern by looking for a black-white-black run from the center in the direction
132			* of another po$(another finder pattern center), and in the opposite direction too.</p>
133			*/
134			private function sizeOfBlackWhiteBlackRunBothWays(float $fromX, float $fromY, float $toX, float $toY):float{
135			$result = $this->sizeOfBlackWhiteBlackRun((int)$fromX, (int)$fromY, (int)$toX, (int)$toY);
136			$dimension = $this->bitMatrix->getDimension();
137			// Now count other way -- don't run off image though of course
138			$scale = 1.0;
139			$otherToX = $fromX - ($toX - $fromX);
140
141			if($otherToX < 0){
142			$scale = $fromX / ($fromX - $otherToX);
143			$otherToX = 0;
144			}
145			elseif($otherToX >= $dimension){
146			$scale = ($dimension - 1 - $fromX) / ($otherToX - $fromX);
147			$otherToX = $dimension - 1;
148			}
149
150			$otherToY = (int)($fromY - ($toY - $fromY) * $scale);
151			$scale = 1.0;
152
153			if($otherToY < 0){
154			$scale = $fromY / ($fromY - $otherToY);
155			$otherToY = 0;
156			}
157			elseif($otherToY >= $dimension){
158			$scale = ($dimension - 1 - $fromY) / ($otherToY - $fromY);
159			$otherToY = $dimension - 1;
160			}
161
162			$otherToX = (int)($fromX + ($otherToX - $fromX) * $scale);
163			$result += $this->sizeOfBlackWhiteBlackRun((int)$fromX, (int)$fromY, (int)$otherToX, (int)$otherToY);
164
165			// Middle pixel is double-counted this way; subtract 1
166			return $result - 1.0;
167			}
168
169			/**
170			* <p>This method traces a line from a po$in the image, in the direction towards another point.
171			* It begins in a black region, and keeps going until it finds white, then black, then white again.
172			* It reports the distance from the start to this point.</p>
173			*
174			* <p>This is used when figuring out how wide a finder pattern is, when the finder pattern
175			* may be skewed or rotated.</p>
176			*/
177			private function sizeOfBlackWhiteBlackRun(int $fromX, int $fromY, int $toX, int $toY):float{
178			// Mild variant of Bresenham's algorithm;
179			// see http://en.wikipedia.org/wiki/Bresenham's_line_algorithm
180			$steep = abs($toY - $fromY) > abs($toX - $fromX);
181
182			if($steep){
183			$temp = $fromX;
184			$fromX = $fromY;
185			$fromY = $temp;
186			$temp = $toX;
187			$toX = $toY;
188			$toY = $temp;
189			}
190
191			$dx = abs($toX - $fromX);
192			$dy = abs($toY - $fromY);
193			$error = -$dx / 2;
194			$xstep = $fromX < $toX ? 1 : -1;
195			$ystep = $fromY < $toY ? 1 : -1;
196
197			// In black pixels, looking for white, first or second time.
198			$state = 0;
199			// Loop up until x == toX, but not beyond
200			$xLimit = $toX + $xstep;
201
202			for($x = $fromX, $y = $fromY; $x !== $xLimit; $x += $xstep){
203			$realX = $steep ? $y : $x;
204			$realY = $steep ? $x : $y;
205
206			// Does current pixel mean we have moved white to black or vice versa?
207			// Scanning black in state 0,2 and white in state 1, so if we find the wrong
208			// color, advance to next state or end if we are in state 2 already
209			if(($state === 1) === $this->bitMatrix->get($realX, $realY)){
210
211			if($state === 2){
212			return FinderPattern::distance($x, $y, $fromX, $fromY);
213			}
214
215			$state++;
216			}
217
218			$error += $dy;
219
220			if($error > 0){
221
222			if($y === $toY){
223			break;
224			}
225
226			$y += $ystep;
227			$error -= $dx;
228			}
229			}
230
231			// Found black-white-black; give the benefit of the doubt that the next pixel outside the image
232			// is "white" so this last po$at (toX+xStep,toY) is the right ending. This is really a
233			// small approximation; (toX+xStep,toY+yStep) might be really correct. Ignore this.
234			if($state === 2){
235			return FinderPattern::distance($toX + $xstep, $toY, $fromX, $fromY);
236			}
237
238			// else we didn't find even black-white-black; no estimate is really possible
239			return NAN;
240			}
241
242			/**
243			* <p>Computes the dimension (number of modules on a size) of the QR Code based on the position
244			* of the finder patterns and estimated module size.</p>
245			*
246			* @throws \RuntimeException
247			*/
248			private function computeDimension(
249			FinderPattern $topLeft,
250			FinderPattern $topRight,
251			FinderPattern $bottomLeft,
252			float $moduleSize
253			):int{
254			$tltrCentersDimension = (int)round($topLeft->getDistance($topRight) / $moduleSize);
255			$tlblCentersDimension = (int)round($topLeft->getDistance($bottomLeft) / $moduleSize);
256			$dimension = (int)((($tltrCentersDimension + $tlblCentersDimension) / 2) + 7);
257
258			switch($dimension % 4){
259			case 0:
260			$dimension++;
261			break;
262			// 1? do nothing
263			case 2:
264			$dimension--;
265			break;
266			case 3:
267			throw new RuntimeException('estimated dimension: '.$dimension);
268			}
269
270			if($dimension % 4 !== 1){
271			throw new RuntimeException('dimension mod 4 is not 1');
272			}
273
274			return $dimension;
275			}
276
277			/**
278			* <p>Attempts to locate an alignment pattern in a limited region of the image, which is
279			* guessed to contain it.</p>
280			*
281			* @param float $overallEstModuleSize estimated module size so far
282			* @param int $estAlignmentX x coordinate of center of area probably containing alignment pattern
283			* @param int $estAlignmentY y coordinate of above
284			* @param float $allowanceFactor number of pixels in all directions to search from the center
285			*
286			* @return \chillerlan\QRCode\Detector\AlignmentPattern\|null if found, or null otherwise
287			*/
288			private function findAlignmentInRegion(
289			float $overallEstModuleSize,
290			int $estAlignmentX,
291			int $estAlignmentY,
292			float $allowanceFactor
293			):?AlignmentPattern{
294			// Look for an alignment pattern (3 modules in size) around where it should be
295			$dimension = $this->bitMatrix->getDimension();
296			$allowance = (int)($allowanceFactor * $overallEstModuleSize);
297			$alignmentAreaLeftX = max(0, $estAlignmentX - $allowance);
298			$alignmentAreaRightX = min($dimension - 1, $estAlignmentX + $allowance);
299
300			if($alignmentAreaRightX - $alignmentAreaLeftX < $overallEstModuleSize * 3){
301			return null;
302			}
303
304			$alignmentAreaTopY = max(0, $estAlignmentY - $allowance);
305			$alignmentAreaBottomY = min($dimension - 1, $estAlignmentY + $allowance);
306
307			if($alignmentAreaBottomY - $alignmentAreaTopY < $overallEstModuleSize * 3){
308			return null;
309			}
310
311			return (new AlignmentPatternFinder($this->bitMatrix, $overallEstModuleSize))->find(
312			$alignmentAreaLeftX,
313			$alignmentAreaTopY,
314			$alignmentAreaRightX - $alignmentAreaLeftX,
315			$alignmentAreaBottomY - $alignmentAreaTopY,
316			);
317			}
318
319			/**
320			*
321			*/
322			private function createTransform(
323			FinderPattern $topLeft,
324			FinderPattern $topRight,
325			FinderPattern $bottomLeft,
326			int $dimension,
327			AlignmentPattern $alignmentPattern = null
328			):PerspectiveTransform{
329			$dimMinusThree = (float)$dimension - 3.5;
330
331			if($alignmentPattern instanceof AlignmentPattern){
332			$bottomRightX = $alignmentPattern->getX();
333			$bottomRightY = $alignmentPattern->getY();
334			$sourceBottomRightX = $dimMinusThree - 3.0;
335			$sourceBottomRightY = $sourceBottomRightX;
336			}
337			else{
338			// Don't have an alignment pattern, just make up the bottom-right point
339			$bottomRightX = ($topRight->getX() - $topLeft->getX()) + $bottomLeft->getX();
340			$bottomRightY = ($topRight->getY() - $topLeft->getY()) + $bottomLeft->getY();
341			$sourceBottomRightX = $dimMinusThree;
342			$sourceBottomRightY = $dimMinusThree;
343			}
344
345			return (new PerspectiveTransform)->quadrilateralToQuadrilateral(
346			3.5, 3.5,
347			$dimMinusThree, 3.5,
348			$sourceBottomRightX, $sourceBottomRightY,
349			3.5, $dimMinusThree,
350			$topLeft->getX(), $topLeft->getY(),
351			$topRight->getX(), $topRight->getY(),
352			$bottomRightX, $bottomRightY,
353			$bottomLeft->getX(), $bottomLeft->getY()
354			);
355			}
356
357			}
358

chillerlan / php-qrcode

Push — main ( b62539...4e03cd )

Detector::sizeOfBlackWhiteBlackRun() F

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