確定哪個是來自經緯度的多邊形

Question

我有一張使用leaflet.js繪製的地圖。如果我輸入經度和緯度值 我可以識別多邊形嗎？我可以爲此獲得客戶端腳本嗎？

Answer 1

得到的回答如下：

//這是一個基於

function getPoint() { 
    float x=-89.82421875;  //x and y represents the lat and lng values 
    float y= 40.18307014852533; 
    var a = boundaries; //the coordinates used to draw the map 
    for (i = 0; i < a.features.length; i++) { 
     PointInPolygon(x,y, a.features[i].geometry.coordinates[0], i); 
    } 
}; 

function PointInPolygon(pointX, pointY, _vertices, number) { 
     var j = _vertices.length - 1; 
     var oddNodes = false; 
     var polyX, polyY,polyXJ,polyYJ; 

     for (var i = 0; i < _vertices.length; i++) { 
      polyY = parseFloat(_vertices[i].toString().split(",")[1]); 
      polyX = parseFloat(_vertices[i].toString().split(",")[0]); 
      polyXJ = parseFloat(_vertices[j].toString().split(",")[0]); 
      polyYJ = parseFloat(_vertices[j].toString().split(",")[1]); 
      if (polyY < pointY && polyYJ >= pointY || 
       polyYJ < pointY && polyY >= pointY) { 
       if (polyX + 
        (pointY - polyY)/(polyYJ - polyY) * (polyXJ - polyX) < pointX) 
       { 
        oddNodes = !oddNodes; 
       } 
      } 
      j = i; 
     } 
     if (oddNodes == true) { 
      map._layers[number+1].fire('click');    //fire the map click event 
     } 
    }