1 | <?php |
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2 | |||
3 | declare(strict_types=1); |
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4 | |||
5 | namespace Phpml\Clustering\KMeans; |
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6 | |||
7 | use ArrayAccess; |
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8 | |||
9 | class Point implements ArrayAccess, \Countable |
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10 | { |
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11 | /** |
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12 | * @var int |
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13 | */ |
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14 | protected $dimension; |
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15 | |||
16 | /** |
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17 | * @var array |
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18 | */ |
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19 | protected $coordinates = []; |
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20 | |||
21 | /** |
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22 | * @var mixed |
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23 | */ |
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24 | protected $label; |
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25 | |||
26 | /** |
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27 | * @param mixed $label |
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28 | */ |
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29 | public function __construct(array $coordinates, $label = null) |
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30 | { |
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31 | $this->dimension = count($coordinates); |
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32 | $this->coordinates = $coordinates; |
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33 | $this->label = $label; |
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34 | } |
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35 | |||
36 | public function toArray(): array |
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37 | { |
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38 | return $this->coordinates; |
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39 | } |
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40 | |||
41 | /** |
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42 | * @return float|int |
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43 | */ |
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44 | public function getDistanceWith(self $point, bool $precise = true) |
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45 | { |
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46 | $distance = 0; |
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47 | for ($n = 0; $n < $this->dimension; ++$n) { |
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48 | $difference = $this->coordinates[$n] - $point->coordinates[$n]; |
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49 | $distance += $difference * $difference; |
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50 | } |
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51 | |||
52 | return $precise ? $distance ** .5 : $distance; |
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53 | } |
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54 | |||
55 | /** |
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56 | * @param Point[] $points |
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57 | */ |
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58 | public function getClosest(array $points): ?self |
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59 | { |
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60 | $minPoint = null; |
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61 | |||
62 | foreach ($points as $point) { |
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63 | $distance = $this->getDistanceWith($point, false); |
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64 | |||
65 | if (!isset($minDistance)) { |
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66 | $minDistance = $distance; |
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67 | $minPoint = $point; |
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68 | |||
69 | continue; |
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70 | } |
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71 | |||
72 | if ($distance < $minDistance) { |
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73 | $minDistance = $distance; |
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74 | $minPoint = $point; |
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75 | } |
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76 | } |
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77 | |||
78 | return $minPoint; |
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79 | } |
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80 | |||
81 | public function getCoordinates(): array |
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82 | { |
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83 | return $this->coordinates; |
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84 | } |
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85 | |||
86 | /** |
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87 | * @param mixed $offset |
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88 | */ |
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89 | public function offsetExists($offset): bool |
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90 | { |
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91 | return isset($this->coordinates[$offset]); |
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92 | } |
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93 | |||
94 | /** |
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95 | * @param mixed $offset |
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96 | * |
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97 | * @return mixed |
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98 | */ |
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99 | public function offsetGet($offset) |
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100 | { |
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101 | return $this->coordinates[$offset]; |
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102 | } |
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103 | |||
104 | /** |
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105 | * @param mixed $offset |
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106 | * @param mixed $value |
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107 | */ |
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108 | public function offsetSet($offset, $value): void |
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109 | { |
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110 | $this->coordinates[$offset] = $value; |
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111 | } |
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112 | |||
113 | /** |
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114 | * @param mixed $offset |
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115 | */ |
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116 | public function offsetUnset($offset): void |
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117 | { |
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118 | unset($this->coordinates[$offset]); |
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119 | } |
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120 | |||
121 | public function count(): int |
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122 | { |
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123 | return count($this->coordinates); |
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124 | } |
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125 | } |
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126 |