Question

我试图在地图上添加圆形叠加层，但如果用户放大或缩小地图，我必须使圆圈保持相同的大小以下代码显示了我如何在地图上显示圆圈

<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Circles</title>
    <style>
        html, body {
            height: 100%;
            margin: 0;
            padding: 0;
        }
        #map {
            height: 100%;
        }
    </style>
</head>
<body>
<div id="map"></div>
<script>
       var citymap = [
        {
            center: {lat:21.176801, lng: 72.832036}
        }
    ];
    var gmarkers = [];
    var markers = [{
        "title": 'point1',
        "lat": '21.17700',
        "lng": '72.8321000',
        "description": 'uuu'
    }];

    function initMap() {
        // Create the map.
        var map = new google.maps.Map(document.getElementById('map'), {
            zoom: 14,
            center: {lat:21.176801, lng: 72.832036},
            mapTypeId: google.maps.MapTypeId.ROADMAP,
            styles: [
                {
                    "featureType": "poi",
                    "stylers": [
                        { "visibility": "off" }
                    ]
                }
            ]
        });
        var infoWindow = new google.maps.InfoWindow();
        var lat_lng = new Array();
        var latlngbounds = new google.maps.LatLngBounds();
        for (i = 0; i < markers.length; i++) {
            var data = markers[i]
            var myLatlng = new google.maps.LatLng(data.lat, data.lng);
            lat_lng.push(myLatlng);
            var marker = new google.maps.Marker({
                position: myLatlng,
                map: map,
                icon:'peoples_Notif.png',
                title: data.title
            });
            latlngbounds.extend(marker.position);
            (function(marker, data) {
                google.maps.event.addListener(marker, "click", function(e) {
                    infoWindow.setContent(data.title);
                    infoWindow.open(map, marker);
                });

            })(marker, data);

            google.maps.event.addListener(marker, "click", function(e) {
                map.setZoom(8);
            });
            gmarkers.push(marker);
        }
        map.setCenter(latlngbounds.getCenter());

        // Construct the circle for each value in citymap.
        //scale circle based on the radius
        for (var i=0;i<citymap.length;i++) {
            var cityCircle = new google.maps.Circle({
                strokeColor: '#FFD700',
                strokeOpacity: 1.0,
                strokeWeight: 2,
                fillColor: '#FFD700',
                fillOpacity: 1.0,
                map: map,
                center: citymap[i].center,
                radius:200
            });

        }
    }

</script>
<script async defer
        src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkkS2pZmOgryjc3ZX0sE5Q8tIdsm-Ged4&signed_in=true&callback=initMap"></script>
<script src="https://google-maps-utility-library-v3.googlecode.com/svn/trunk/infobox/src/infobox.js"></script>
</body>
</html>

可以说有一个选项，我可以启用或如何去做它

Answer 1

有几种选择：

向地图添加zoom_changed收听者，并根据缩放级别动态调整您的圈子大小（每个缩放级别为2个不同的因素）

对圆圈使用圆形标记，SVG符号似乎起作用：

var cityCircleM = new google.maps.Marker({
    map: map,
    position: citymap[i].center,
    title: "circle",
    icon: {
      strokeColor: '#FFD700',
      strokeOpacity: 1.0,
      strokeWeight: 2,
      fillColor: '#FFD700',
      fillOpacity: 1.0,
      path: google.maps.SymbolPath.CIRCLE,
      scale: 20,
      anchor: new google.maps.Point(0, 0)
    },
    zIndex: Math.round(citymap[i].center.lat * -100000) << 5

  });

proof of concept fiddle

谷歌地图圈叠加 - 固定大小放大并缩小地图

1 个答案: