1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
<?php
/**
* Class FinderPattern
*
* @created 17.01.2021
* @author ZXing Authors
* @author Smiley <smiley@chillerlan.net>
* @copyright 2021 Smiley
* @license Apache-2.0
*/
namespace chillerlan\QRCode\Detector;
use function sqrt;
/**
* 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.
*
* @author Sean Owen
*/
final class FinderPattern extends ResultPoint{
private int $count;
/**
*
*/
public function __construct(float $posX, float $posY, float $estimatedModuleSize, ?int $count = null){
parent::__construct($posX, $posY, $estimatedModuleSize);
$this->count = ($count ?? 1);
}
/**
*
*/
public function getCount():int{
return $this->count;
}
/**
* @param \chillerlan\QRCode\Detector\FinderPattern $b second pattern
*
* @return float distance between two points
*/
public function getDistance(FinderPattern $b):float{
return self::distance($this->x, $this->y, $b->x, $b->y);
}
/**
* Get square of distance between a and b.
*/
public function getSquaredDistance(FinderPattern $b):float{
return self::squaredDistance($this->x, $this->y, $b->x, $b->y);
}
/**
* Combines this object's current estimate of a finder pattern position and module size
* with a new estimate. It returns a new FinderPattern containing a weighted average
* based on count.
*/
public function combineEstimate(float $i, float $j, float $newModuleSize):self{
$combinedCount = ($this->count + 1);
return new self(
($this->count * $this->x + $j) / $combinedCount,
($this->count * $this->y + $i) / $combinedCount,
($this->count * $this->estimatedModuleSize + $newModuleSize) / $combinedCount,
$combinedCount
);
}
/**
*
*/
private static function squaredDistance(float $aX, float $aY, float $bX, float $bY):float{
$xDiff = ($aX - $bX);
$yDiff = ($aY - $bY);
return ($xDiff * $xDiff + $yDiff * $yDiff);
}
/**
*
*/
public static function distance(float $aX, float $aY, float $bX, float $bY):float{
return sqrt(self::squaredDistance($aX, $aY, $bX, $bY));
}
}
|
