百度地图判断当前位置是否在多边形范围里面

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  注意:

1.百度地图ak换成自己在百度地图官网申请

2.建议使用firefox浏览器,google被墙无法调用gps

3.发布到服务器必须使用https,对于localhost和本地测试不用

4.电脑开启位置服务,手机打开gps定位

5.百度地图坐标和gps坐标不一致,要在百度地图正确显示位置必须把gps坐标转为百度坐标 

6.多边形范围绘制页面:https://www.idaobin.com/archives/2267.html

<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <style type="text/css">
        body,
        html,
        #allmap {
            width: 100%;
            height: 100%;
            overflow: hidden;
            margin: 0;
            font-family: "微软雅黑";
        }
    </style>
    <script type="text/javascript"
        src="https://api.map.baidu.com/api?v=2.0&ak=自己申请"></script>
    <script type="text/javascript" src="GeoUtils.js"></script>


    <title>多边形区域判断</title>
</head>

<body>
    <div>可以把地图缩小,看一下多边形范围画在哪</div>
    <input type="button" name="" id="daka" value="判定">
    <div id="allmap"></div>
</body>

</html>
<script type="text/javascript">
    getMyLocation();
    function getMyLocation() {
        if (navigator.geolocation) {
            //判断是否有这个对象
            navigator.geolocation.getCurrentPosition(function (pos) {
                var bd = GpsToBaiduPoint(pos.coords);
                var list = new Array();
                list.push(bd);
                initialize(list);

                var marker = new BMap.Marker(list[0]); //将点转化成标注点
                map.addOverlay(marker);  //将标注点添加到地图上
                var infoWindow = new BMap.InfoWindow("当前位置");
                marker.openInfoWindow(infoWindow); //图片加载完后重绘infoWindow
            })
        } else {
            console.log("当前系统不支持GPS API")
        }
    }


    //创建地图
    var map = new BMap.Map("allmap");

    //创建多边形  
    var polygonpoint = [{ "lng": 102.658456, "lat": 25.353849 }, { "lng": 103.435741, "lat": 25.27023 }, { "lng": 103.164381, "lat": 24.958241 }, { "lng": 102.587166, "lat": 24.993878 }];

    var range = [];
    for (var i = 0; i < polygonpoint.length; i++) {
        range.push(new BMap.Point(polygonpoint[i].lng, polygonpoint[i].lat))
    }

    var polygon = new BMap.Polygon(range, { strokeColor: "#f50704", fillColor: "#cfcfcf", strokeWeight: 3, strokeOpacity: 0, fillOpacity: 0, });


    function showInfo(thisMarker, point) {
        //判断点是否在
        if (BMapLib.GeoUtils.isPointInPolygon(point, polygon)) {
            alert("在区域内");
        } else {
            alert("不在区域内");
        }
    }


    function initialize(bdpoint) {
        // 百度地图API功能  
        map.addControl(new BMap.NavigationControl());               // 添加平移缩放控件  
        map.addControl(new BMap.ScaleControl());                    // 添加比例尺控件  
        map.addControl(new BMap.OverviewMapControl());              //添加缩略地图控件  
        map.enableScrollWheelZoom();                            //启用滚轮放大缩小  
        map.addControl(new BMap.MapTypeControl());          //添加地图类型控件  

        var point = new BMap.Point(bdpoint[0].lng, bdpoint[0].lat);    // 创建点坐标  
        map.centerAndZoom(point, 10);                      // 初始化地图,设置中心点坐标和地图级别。  
        map.addOverlay(polygon);
        
        //点击事件
        var btn = document.getElementById("daka");
        btn.addEventListener("click",
            function () {
                showInfo(this, bdpoint[0]);
            });
    }



    function GpsToBaiduPoint(point) {
        var _t = wgs2bd(point.latitude, point.longitude);
        var _BPoint = new BMap.Point(_t[1], _t[0]);
        return _BPoint;
    }

    var pi = 3.14159265358979324;
    var a = 6378245.0;
    var ee = 0.00669342162296594323;
    var x_pi = 3.14159265358979324 * 3000.0 / 180.0;


    //世界大地坐标转为百度坐标
    function wgs2bd(lat, lon) {
        var wgs2gcjR = wgs2gcj(lat, lon);
        var gcj2bdR = gcj2bd(wgs2gcjR[0], wgs2gcjR[1]);
        return gcj2bdR;
    }
    function gcj2bd(lat, lon) {
        var x = lon,
            y = lat;
        var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
        var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
        var bd_lon = z * Math.cos(theta) + 0.0065;
        var bd_lat = z * Math.sin(theta) + 0.006;
        var result = [];
        result.push(bd_lat);
        result.push(bd_lon);
        return result;
    }

    function bd2gcj(lat, lon) {
        var x = lon - 0.0065,
            y = lat - 0.006;
        var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
        var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
        var gg_lon = z * Math.cos(theta);
        var gg_lat = z * Math.sin(theta);
        var result = [];
        result.push(gg_lat);
        result.push(gg_lon);
        return result;
    }

    function wgs2gcj(lat, lon) {
        var dLat = transformLat(lon - 105.0, lat - 35.0);
        var dLon = transformLon(lon - 105.0, lat - 35.0);
        var radLat = lat / 180.0 * pi;
        var magic = Math.sin(radLat);
        magic = 1 - ee * magic * magic;
        var sqrtMagic = Math.sqrt(magic);
        dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
        var mgLat = lat + dLat;
        var mgLon = lon + dLon;
        var result = [];
        result.push(mgLat);
        result.push(mgLon);
        return result;
    }

    function transformLat(lat, lon) {
        var ret = -100.0 + 2.0 * lat + 3.0 * lon + 0.2 * lon * lon + 0.1 * lat * lon + 0.2 * Math.sqrt(Math.abs(lat));
        ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(lon * pi) + 40.0 * Math.sin(lon / 3.0 * pi)) * 2.0 / 3.0;
        ret += (160.0 * Math.sin(lon / 12.0 * pi) + 320 * Math.sin(lon * pi / 30.0)) * 2.0 / 3.0;
        return ret;
    }

    function transformLon(lat, lon) {
        var ret = 300.0 + lat + 2.0 * lon + 0.1 * lat * lat + 0.1 * lat * lon + 0.1 * Math.sqrt(Math.abs(lat));
        ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
        ret += (20.0 * Math.sin(lat * pi) + 40.0 * Math.sin(lat / 3.0 * pi)) * 2.0 / 3.0;
        ret += (150.0 * Math.sin(lat / 12.0 * pi) + 300.0 * Math.sin(lat / 30.0 * pi)) * 2.0 / 3.0;
        return ret;
    }
</script>

原文链接:https://www.idaobin.com/archives/2275.html

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