点是否在多边形内

使用 AMap.GeometryUtil.isPointInRing ，判断点是否在多边形内。

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          <!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
    <title>点是否在多边形内</title>
    <link rel="stylesheet" href="https://a.amap.com/jsapi_demos/static/demo-center/css/demo-center.css" type="text/css">
    <script type="text/javascript" src="https://webapi.amap.com/maps?v=1.4.15&key=您申请的key值"></script>
    <script type="text/javascript" src="https://cache.amap.com/lbs/static/addToolbar.js"></script>
    <style>
      html,body,#container{
        height: 100%
      }
    </style>
</head>
<body>
<div id="container"></div>
<div class='info'>拖动Marker可调整位置</div>
<script type="text/javascript">
    //初始化地图对象，加载地图
    var map = new AMap.Map("container", {
        resizeEnable: true,
        zoom: 13
    });

    // 创建多边形
    var path = [
        [116.169465,39.932670],
        [116.160260,39.924492], 
        [116.186138,39.879817], 
        [116.150625,39.710019],
        [116.183198,39.709920], 
        [116.226950,39.777616], 
        [116.421078,39.810771],
        [116.442621,39.799892],
        [116.463478,39.790066], 
        [116.588276,39.809551],
        [116.536091,39.808859],
        [116.573856,39.839643], 
        [116.706380,39.916740],
        [116.657285,39.934545],
        [116.600293,39.937770],
        [116.540039,39.937968],
        [116.514805,39.982375],
        [116.499935,40.013710],
        [116.546520,40.030443], 
        [116.687668,40.129961], 
        [116.539697,40.080659],
        [116.503390,40.058474],
        [116.468800,40.052578]
    ];
    var polygon = new AMap.Polygon({
        map: map,
        fillOpacity:0.4,
        path: path
    });

    // 创建点
    var marker = new AMap.Marker({
        map: map,
        draggable:true,
        position: [116.566298, 40.014179]
    });

    function compute(){
        var point = marker.getPosition();
        var isPointInRing = AMap.GeometryUtil.isPointInRing(point,path);
        marker.setLabel({
            content:isPointInRing?'内部':'外部',
            offset:new AMap.Pixel(20,0)
        });
    }

    compute();
    // 为marker绑定拖拽事件
    marker.on('dragging',compute)
    map.setFitView();
   
</script>
</body>
</html>
        

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