php驗證地圖座標在某片座標區域內

mysql空間查詢並不太適合地圖座標，若是使用：http://www.cnblogs.com/tyjsjl/p/8760002.html的方式進行地圖點座標的查詢就很差用了，因而直接使用php來進行地圖範圍的查詢更方便點。代碼以下：

 1 /**
 2  * 驗證座標點是否在某區域內
 3  * @author xiaoliang <1058436713@qq.com>
 4  * Class validationMap
 5  */
 6 class validationMap{
 7     private $coordArray;
 8     private $vertx = [];
 9     private $verty = [];
10     /**
11      * 設置座標區域
12      * @param mixed $coordArray
13      */
14     public function setCoordArray(array $coordArray)
15     {
16         $this->coordArray = $coordArray;
17     }
18     /**
19      * 驗證區域範圍
20      * @param array $coordArray
21      * @return bool
22      */
23     public function isCityCenter(array $coordArray){
24         if(!$this->vaildatePoint($coordArray)){
25             return false;
26         }
27         return $this->pnpoly(count($this->coordArray), $coordArray['lng'], $coordArray['lat']);
28     }
29     /**
30      * 比較區域座標
31      * @param $nvert
32      * @param $testx
33      * @param $testy
34      * @return bool
35      */
36     private function pnpoly($nvert,$testx, $testy)
37     {
38         $c = false;
39         for ($i = 0, $j = $nvert-1; $i < $nvert; $j = $i++) {
40             if ( ( ($this->verty[$i]>$testy) != ($this->verty[$j]>$testy) ) && ($testx < ($this->vertx[$j]-$this->vertx[$i]) * ($testy-$this->verty[$i]) / ($this->verty[$j]-$this->verty[$i]) + $this->vertx[$i]) )
41                 $c = !$c;
42         }
43         return $c;
44     }
45     /**
46      * 驗證座標
47      * @param array $pointArray
48      * @return bool
49      */
50     private function vaildatePoint(array $pointArray){
51         $maxY = $maxX = 0;
52         $minY = $minX = 9999;
53         foreach ($this->coordArray as $item){
54             if($item['lng']>$maxX) $maxX = $item['lng'];
55             if($item['lng'] < $minX) $minX = $item['lng'];
56             if($item['lat']>$maxY) $maxY = $item['lat'];
57             if($item['lat'] < $minY) $minY = $item['lat'];
58             $this->vertx[] = $item['lng'];
59             $this->verty[] = $item['lat'];
60         }
61         if ($pointArray['lng'] < $minX || $pointArray['lng'] > $maxX || $pointArray['lat'] < $minY || $pointArray['lat'] > $maxY) {
62             return false;
63         }
64         return true;
65     }
66 }

/**************************** test *************************************
$map = [  //上海
    ["lng" => 121.488286, "lat" => 31.420147],
    ["lng" => 121.702154, "lat" => 31.294828],
    ["lng" => 121.780918, "lat" => 31.141157],
    ["lng" => 121.782068, "lat" => 30.941157],
    ["lng" => 121.492885, "lat" => 30.909931],
    ["lng" => 121.22325, "lat" => 30.890099],
    ["lng" => 121.161482, "lat" => 31.015526],
    ["lng" => 121.076395, "lat" => 31.226239],
    ["lng" => 121.189873, "lat" => 31.339688],
    ["lng" => 121.459509, "lat" => 31.41368],
];
$array = ["lat"=>31.218681,"lng"=>121.08604];//進行驗證的區域
validationMap::setCoordArray($map);
var_dump(validationMap::isCityCenter($array));

 

由於每一個區域的地圖點座標須要從數據庫提取進行查詢，因此靜態類就不太方便了，本文代碼不使用靜態類。關於靜態類的優缺點在此不做說明。

原文代碼：https://www.cnblogs.com/liang94/p/5936583.html