|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* Box packing (3D bin packing, knapsack problem). |
|
4
|
|
|
* |
|
5
|
|
|
* @author Doug Wright |
|
6
|
|
|
*/ |
|
7
|
|
|
|
|
8
|
|
|
namespace DVDoug\BoxPacker; |
|
9
|
|
|
|
|
10
|
|
|
/** |
|
11
|
|
|
* An item to be packed. |
|
12
|
|
|
* |
|
13
|
|
|
* @author Doug Wright |
|
14
|
|
|
*/ |
|
15
|
|
|
class OrientatedItem |
|
16
|
|
|
{ |
|
17
|
|
|
/** |
|
18
|
|
|
* @var Item |
|
19
|
|
|
*/ |
|
20
|
|
|
protected $item; |
|
21
|
|
|
|
|
22
|
|
|
/** |
|
23
|
|
|
* @var int |
|
24
|
|
|
*/ |
|
25
|
|
|
protected $width; |
|
26
|
|
|
|
|
27
|
|
|
/** |
|
28
|
|
|
* @var int |
|
29
|
|
|
*/ |
|
30
|
|
|
protected $length; |
|
31
|
|
|
|
|
32
|
|
|
/** |
|
33
|
|
|
* @var int |
|
34
|
|
|
*/ |
|
35
|
|
|
protected $depth; |
|
36
|
|
|
|
|
37
|
|
|
|
|
38
|
|
|
/** |
|
39
|
|
|
* @var float[] |
|
40
|
|
|
*/ |
|
41
|
|
|
protected static $tippingPointCache = []; |
|
42
|
|
|
|
|
43
|
|
|
/** |
|
44
|
|
|
* Constructor. |
|
45
|
|
|
* |
|
46
|
|
|
* @param Item $item |
|
47
|
|
|
* @param int $width |
|
48
|
|
|
* @param int $length |
|
49
|
|
|
* @param int $depth |
|
50
|
|
|
*/ |
|
51
|
19 |
|
public function __construct(Item $item, $width, $length, $depth) |
|
52
|
|
|
{ |
|
53
|
19 |
|
$this->item = $item; |
|
54
|
19 |
|
$this->width = $width; |
|
55
|
19 |
|
$this->length = $length; |
|
56
|
19 |
|
$this->depth = $depth; |
|
57
|
19 |
|
} |
|
58
|
|
|
|
|
59
|
|
|
/** |
|
60
|
|
|
* Item. |
|
61
|
|
|
* |
|
62
|
|
|
* @return Item |
|
63
|
|
|
*/ |
|
64
|
19 |
|
public function getItem() |
|
65
|
|
|
{ |
|
66
|
19 |
|
return $this->item; |
|
67
|
|
|
} |
|
68
|
|
|
|
|
69
|
|
|
/** |
|
70
|
|
|
* Item width in mm in it's packed orientation. |
|
71
|
|
|
* |
|
72
|
|
|
* @return int |
|
73
|
|
|
*/ |
|
74
|
19 |
|
public function getWidth() |
|
75
|
|
|
{ |
|
76
|
19 |
|
return $this->width; |
|
77
|
|
|
} |
|
78
|
|
|
|
|
79
|
|
|
/** |
|
80
|
|
|
* Item length in mm in it's packed orientation. |
|
81
|
|
|
* |
|
82
|
|
|
* @return int |
|
83
|
|
|
*/ |
|
84
|
19 |
|
public function getLength() |
|
85
|
|
|
{ |
|
86
|
19 |
|
return $this->length; |
|
87
|
|
|
} |
|
88
|
|
|
|
|
89
|
|
|
/** |
|
90
|
|
|
* Item depth in mm in it's packed orientation. |
|
91
|
|
|
* |
|
92
|
|
|
* @return int |
|
93
|
|
|
*/ |
|
94
|
19 |
|
public function getDepth() |
|
95
|
|
|
{ |
|
96
|
19 |
|
return $this->depth; |
|
97
|
|
|
} |
|
98
|
|
|
|
|
99
|
|
|
/** |
|
100
|
|
|
* Calculate the surface footprint of the current orientation. |
|
101
|
|
|
* |
|
102
|
|
|
* @return int |
|
103
|
|
|
*/ |
|
104
|
11 |
|
public function getSurfaceFootprint() |
|
105
|
|
|
{ |
|
106
|
11 |
|
return $this->width * $this->length; |
|
107
|
|
|
} |
|
108
|
|
|
|
|
109
|
|
|
/** |
|
110
|
|
|
* @return float |
|
111
|
|
|
*/ |
|
112
|
19 |
|
public function getTippingPoint() |
|
113
|
|
|
{ |
|
114
|
19 |
|
$cacheKey = $this->width . '|' . $this->length . '|' . $this->depth; |
|
115
|
|
|
|
|
116
|
19 |
|
if (isset(static::$tippingPointCache[$cacheKey])) { |
|
117
|
18 |
|
$tippingPoint = static::$tippingPointCache[$cacheKey]; |
|
118
|
|
|
} else { |
|
119
|
17 |
|
$tippingPoint = atan(min($this->length, $this->width) / $this->depth); |
|
120
|
17 |
|
static::$tippingPointCache[$cacheKey] = $tippingPoint; |
|
121
|
|
|
} |
|
122
|
|
|
|
|
123
|
19 |
|
return $tippingPoint; |
|
124
|
|
|
} |
|
125
|
|
|
|
|
126
|
|
|
/** |
|
127
|
|
|
* Is this item stable (low centre of gravity), calculated as if the tipping point is >15 degrees. |
|
128
|
|
|
* |
|
129
|
|
|
* N.B. Assumes equal weight distribution. |
|
130
|
|
|
* |
|
131
|
|
|
* @return bool |
|
132
|
|
|
*/ |
|
133
|
19 |
|
public function isStable() |
|
134
|
|
|
{ |
|
135
|
19 |
|
return $this->getTippingPoint() > 0.261; |
|
136
|
|
|
} |
|
137
|
|
|
} |
|
138
|
|
|
|
dvdoug /
BoxPacker
