|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* PHPCoord. |
|
4
|
|
|
* |
|
5
|
|
|
* @author Doug Wright |
|
6
|
|
|
*/ |
|
7
|
|
|
declare(strict_types=1); |
|
8
|
|
|
|
|
9
|
|
|
namespace PHPCoord; |
|
10
|
|
|
|
|
11
|
|
|
use DateTimeInterface; |
|
12
|
|
|
use function floor; |
|
13
|
|
|
use function implode; |
|
14
|
|
|
use PHPCoord\CoordinateReferenceSystem\Projected; |
|
15
|
|
|
use PHPCoord\Exception\InvalidCoordinateException; |
|
16
|
|
|
use PHPCoord\UnitOfMeasure\Length\Length; |
|
17
|
|
|
use PHPCoord\UnitOfMeasure\Length\Metre; |
|
18
|
|
|
use function str_pad; |
|
19
|
|
|
use const STR_PAD_LEFT; |
|
20
|
|
|
use function str_replace; |
|
21
|
|
|
use function strlen; |
|
22
|
|
|
use function strpos; |
|
23
|
|
|
use function substr; |
|
24
|
|
|
|
|
25
|
|
|
/** |
|
26
|
|
|
* N.B. This is the older 1975 system, not the current ITM system for which @see IrishTransverseMercatorPoint. |
|
27
|
|
|
*/ |
|
28
|
|
|
class IrishGridPoint extends ProjectedPoint |
|
29
|
|
|
{ |
|
30
|
|
|
private const GRID_LETTERS = 'VWXYZQRSTULMNOPFGHJKABCDE'; |
|
31
|
|
|
|
|
32
|
6 |
|
public function __construct(Length $easting, Length $northing, ?DateTimeInterface $epoch = null) |
|
33
|
|
|
{ |
|
34
|
6 |
|
parent::__construct($easting, $northing, null, null, Projected::fromSRID(Projected::EPSG_TM75_IRISH_GRID), $epoch); |
|
35
|
6 |
|
} |
|
36
|
|
|
|
|
37
|
|
|
/** |
|
38
|
|
|
* @param string $reference Irish grid reference (e.g. "T514131") |
|
39
|
|
|
*/ |
|
40
|
3 |
|
public static function fromGridReference(string $reference, ?DateTimeInterface $epoch = null): self |
|
41
|
|
|
{ |
|
42
|
3 |
|
$reference = str_replace(' ', '', $reference); |
|
43
|
|
|
|
|
44
|
3 |
|
if (strlen($reference) % 2 === 0) { |
|
45
|
|
|
throw new InvalidCoordinateException('Grid ref must be an even number of characters'); |
|
46
|
|
|
} |
|
47
|
|
|
|
|
48
|
|
|
//Letter is 100km grid sq, origin at 0,0 of this square |
|
49
|
3 |
|
$minorEasting = strpos(static::GRID_LETTERS, $reference[0]) % 5 * 100000; |
|
50
|
3 |
|
$minorNorthing = (floor(strpos(static::GRID_LETTERS, $reference[0]) / 5)) * 100000; |
|
51
|
|
|
|
|
52
|
|
|
//numbers are a division of that square into smaller and smaller pieces |
|
53
|
3 |
|
$numericPortion = substr($reference, 1); |
|
54
|
3 |
|
$numericPortionSize = strlen($numericPortion) / 2; |
|
55
|
3 |
|
$gridSizeInMetres = 1 * (10 ** (5 - $numericPortionSize)); |
|
56
|
|
|
|
|
57
|
3 |
|
$easting = $minorEasting + (substr($numericPortion, 0, $numericPortionSize) * $gridSizeInMetres); |
|
58
|
3 |
|
$northing = $minorNorthing + (substr($numericPortion, -$numericPortionSize, $numericPortionSize) * $gridSizeInMetres); |
|
59
|
|
|
|
|
60
|
3 |
|
return new static(new Metre($easting), new Metre($northing), $epoch); |
|
61
|
|
|
} |
|
62
|
|
|
|
|
63
|
|
|
/** |
|
64
|
|
|
* Grid reference without spaces. e.g. T514131. |
|
65
|
|
|
*/ |
|
66
|
1 |
|
public function asGridReference(int $length): string |
|
67
|
|
|
{ |
|
68
|
1 |
|
return implode('', $this->gridReference($length)); |
|
69
|
|
|
} |
|
70
|
|
|
|
|
71
|
|
|
/** |
|
72
|
|
|
* Convert this grid reference into a grid reference string of a |
|
73
|
|
|
* given length (2, 4, 6, 8 or 10) including the character |
|
74
|
|
|
* designation for the 100km square. e.g. T514131. |
|
75
|
|
|
* |
|
76
|
|
|
* @return string |
|
77
|
|
|
*/ |
|
78
|
1 |
|
protected function gridReference(int $length): array |
|
79
|
|
|
{ |
|
80
|
1 |
|
if ($length % 2 !== 0) { |
|
81
|
|
|
throw new InvalidCoordinateException('Chosen length must be an even number'); |
|
82
|
|
|
} |
|
83
|
|
|
|
|
84
|
1 |
|
$halfLength = $length / 2; |
|
85
|
|
|
|
|
86
|
1 |
|
$x = $this->easting->asMetres()->getValue(); |
|
87
|
1 |
|
$y = $this->northing->asMetres()->getValue(); |
|
88
|
1 |
|
$easting = str_pad((string) $x, 6, '0', STR_PAD_LEFT); |
|
89
|
1 |
|
$northing = str_pad((string) $y, 6, '0', STR_PAD_LEFT); |
|
90
|
|
|
|
|
91
|
|
|
//second (minor) letter is 100km grid sq, origin at 0,0 of this square |
|
92
|
1 |
|
$minorSquaresEast = $easting[0] % 5; |
|
93
|
1 |
|
$minorSquaresNorth = $northing[0] % 5; |
|
94
|
1 |
|
$minorLetterIndex = (5 * $minorSquaresNorth + $minorSquaresEast); |
|
95
|
1 |
|
$minorLetter = substr(self::GRID_LETTERS, $minorLetterIndex, 1); |
|
96
|
|
|
|
|
97
|
|
|
return [ |
|
98
|
1 |
|
$minorLetter, |
|
99
|
1 |
|
substr($easting, 1, $halfLength), |
|
100
|
1 |
|
substr($northing, 1, $halfLength), |
|
101
|
|
|
]; |
|
102
|
|
|
} |
|
103
|
|
|
} |
|
104
|
|
|
|
dvdoug /
PHPCoord
