百度地圖api js判斷座標點是否在多邊形內

1.百度地圖api js有提供計算座標點包含的函數，使用前需引入

<script type="text/javascript" src="http://api.map.baidu.com/library/GeoUtils/1.2/src/GeoUtils_min.js"></script>
		

2.編寫js

//多邊形覆蓋物座標
var overlays = [
	new BMap.Point(106.602849,29.562462),new BMap.Point(106.635619,29.595882),
	new BMap.Point(106.65143,29.571383),new BMap.Point(106.620532,29.512593),
	new BMap.Point(106.5948,29.52815),new BMap.Point(106.602849,29.562462)
];
function ptInPolygon(point){  //判斷傳入的points點是否在ply多邊形裏面，是返回true，否返回false
    var ply = new BMap.Polygon(overlays);
    var result = BMapLib.GeoUtils.isPointInPolygon(point, ply);
    if(result==true){
	return true;
    }else{
	return false;
    }
}