roc*_*tar 60 javascript google-maps google-maps-api-3
这是我编写的代码,通过提供纬度和经度将标记添加到谷歌地图.问题是我得到了一个非常高度缩放的谷歌地图.我已经尝试将缩放级别设置为1,但这对高度缩放的地图没有影响.
<script src="http://maps.google.com/maps/api/js?v=3&sensor=false" type="text/javascript"></script>
<script type="text/javascript">
var icon = new google.maps.MarkerImage("http://maps.google.com/mapfiles/ms/micons/blue.png",new google.maps.Size(32, 32), new google.maps.Point(0, 0),new google.maps.Point(16, 32));
var center = null;
var map = null;
var currentPopup;
var bounds = new google.maps.LatLngBounds();
function addMarker(lat, lng, info) {
var pt = new google.maps.LatLng(lat, lng);
bounds.extend(pt);
var marker = new google.maps.Marker({
position: pt,
icon: icon,
map: map
});
var popup = new google.maps.InfoWindow({
content: info,
maxWidth: 300
});
google.maps.event.addListener(marker, "click", function() {
if (currentPopup != null) {
currentPopup.close();
currentPopup = null;
}
popup.open(map, marker);
currentPopup = popup;
});
google.maps.event.addListener(popup, "closeclick", function() {
map.panTo(center);
currentPopup = null;
});
}
function initMap() {
map = new google.maps.Map(document.getElementById("map"), {
center: new google.maps.LatLng(0, 0),
zoom: 1,
mapTypeId: google.maps.MapTypeId.ROADMAP,
mapTypeControl: false,
mapTypeControlOptions: {
style: google.maps.MapTypeControlStyle.HORIZONTAL_BAR
},
navigationControl: true,
navigationControlOptions: {
style: google.maps.NavigationControlStyle.SMALL
}
});
addMarker(27.703402,85.311668,'New Road');
center = bounds.getCenter();
map.fitBounds(bounds);
}
</script>
</head>
<body onload="initMap()" style="margin:0px; border:0px; padding:0px;">
<div id="map"></div>
</body>
</html>
如何降低此案例的缩放级别？
geo*_*zip 101
下面的代码是缩放地图以适应指定的边界:
addMarker(27.703402,85.311668,'New Road');
center = bounds.getCenter();
map.fitBounds(bounds);
如果您只有1个标记并将其添加到边界,则会产生最接近的缩放:
function addMarker(lat, lng, info) {
var pt = new google.maps.LatLng(lat, lng);
bounds.extend(pt);
}
如果您跟踪已"添加"到地图的标记数量(或扩展边界),则只能在该数字大于1时调用fitBounds.我通常将标记推入一个数组(供以后使用)并测试该数组的长度.
如果您只有一个标记,请不要使用fitBounds.打电话setCenter,setZoom用标记位置和您所需的缩放水平.
function addMarker(lat, lng, info) {
var pt = new google.maps.LatLng(lat, lng);
map.setCenter(pt);
map.setZoom(your desired zoom);
}
Tie*_*ies 18
map.setZoom(zoom:number)
https://developers.google.com/maps/documentation/javascript/reference#Map
Rah*_*nde 17
你要找的是每个缩放级别的比例.数字以米为单位.使用这些:
20:1128.497220
19:2256.994440
18:4513.988880
17:9027.977761
16:18055.955520
15:36111.911040
14:72223.822090
13:144447.644200
12:288895.288400
11:577790.576700
10:1155581.153000
9:2311162.307000
8:4622324.614000
7:9244649.227000
6:18489298.450000
5:36978596.910000
4:73957193.820000
3:147914387.600000
2:295828775.300000
1:591657550.500000
这是我使用的功能:
var map = new google.maps.Map(document.getElementById('map'), {
center: new google.maps.LatLng(52.2, 5),
mapTypeId: google.maps.MapTypeId.ROADMAP,
zoom: 7
});
function zoomTo(level) {
google.maps.event.addListener(map, 'zoom_changed', function () {
zoomChangeBoundsListener = google.maps.event.addListener(map, 'bounds_changed', function (event) {
if (this.getZoom() > level && this.initialZoom == true) {
this.setZoom(level);
this.initialZoom = false;
}
google.maps.event.removeListener(zoomChangeBoundsListener);
});
});
}