我想知道Google是否有可能在不同的缩放级别上查看不同的标记。
例如，在缩放级别1上，我希望在中国上方有一个标记，标签为“5”。当用户放大时，让我们说缩放级别4，我希望之前的标记和标签消失。我希望有5个新的标记/标签，每个都在中国不同的城市都说“1”。因此，中国会说一个数字，中国所有城市都会说数字加起来就是中国的数字。
我想弄清楚的关键概念是如何根据缩放级别隐藏标记和标签。对我来说，一个限制因素是我目前居住在中国谷歌被审查的地方，所以很多在线文件都会受到审查，包括许多谷歌的文件。
到目前为止，这是我的代码
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<title>TM China</title>
<style type="text/css">
html, body, #map_canvas { margin: 0; padding: 0; height: 100% }
.labels {
color: red;
background-color: white;
font-family: "Lucida Grande", "Arial", sans-serif;
font-size: 10px;
font-weight: bold;
text-align: center;
width: 60px;
border: 2px solid black;
white-space: nowrap;
}
</style>
<script type="text/javascript"
src="http://maps.googleapis.com/maps/api/js?key=AIzaSyDV0lcdK7C2GHbQAmdkBID70Uppuf-D030&sensor=true">
</script>
<script type="text/javascript">
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var map;
var mapOptions = { center: new google.maps.LatLng(35, 105), zoom: 3,
mapTypeId: google.maps.MapTypeId.ROADMAP };
var locations = [
['Hong Kong', 22.39, 114.10, 1885],
['Shanghai', 31.232, 121.47, 5885],
['Beijing', 39.88, 116.40, 6426],
['Guangzhou', 23.129, 113.264, 4067],
['Shenzhen', 22.54, 114.05, 3089],
['Hangzhou', 30.27, 120.15, 954]
];
var infowindow = new google.maps.InfoWindow();
var i;
/*
for (i = 0; i < locations.length; i++) {
marker = new google.maps.Marker({
position: new google.maps.LatLng(locations[i][1], locations[i][2]),
map: map
});
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
infowindow.setContent(locations[i][0]);
infowindow.open(map, marker);
}
})(marker, i));
} */
function myMarker(options) {
if(!options.labelAnchor) {
options.labelAnchor = new google.maps.Point(30, 50);
}
if(!options.labelClass) {
options.labelClass = "labels";
}
options.map = map;
return new MarkerWithLabel(options);
}
function initialize() {
map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
for (i = 0; i < locations.length; i++) {
var marker = new MarkerWithLabel({
position: new google.maps.LatLng(locations[i][1], locations[i][2]),
draggable: false,
map: map,
labelContent: locations[i][3],
labelAnchor: new google.maps.Point(30, 0),
labelClass: "labels", // the CSS class for the label
labelStyle: {opacity: 0.75}
});
}
/*
var marker2 = new myMarker({
position: new google.maps.LatLng(20,20),
draggable: true,
labelContent: "second"
});
*/
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width:85%; height:85%"></div>
<script type="text/javascript">
</script>
</body>
</html>
编辑
我一直在尝试使用MarkerManager，但我无法在不同的缩放级别上成功创建标记。
首先，我将默认缩放级别更改为1，然后将代码更改为下面显示的内容。
function initialize() {
map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
/* for (i = 0; i < locations.length; i++) {
var marker = new MarkerWithLabel({
position: new google.maps.LatLng(locations[i][1], locations[i][2]),
draggable: false,
map: map,
labelContent: locations[i][3],
labelAnchor: new google.maps.Point(30, 0),
labelClass: "labels", // the CSS class for the label
labelStyle: {opacity: 0.75}
});
} */
var listener = google.maps.event.addListener(map, 'bounds_changed', function(){
setupMarkers();
google.maps.event.removeListener(listener);
});
}
function createCityMarkers() {
for (i = 0; i < locations.length; i++) {
var marker = new MarkerWithLabel({
position: new google.maps.LatLng(locations[i][1], locations[i][2]),
draggable: false,
map: map,
labelContent: locations[i][3],
labelAnchor: new google.maps.Point(30, 0),
labelClass: "labels", // the CSS class for the label
labelStyle: {opacity: 0.75}
});
}
}
function setupMarkers() {
mgr = new MarkerManager(map);
google.maps.event.addListener(mgr, 'loaded', function(){
mgr.addMarkers(createCityMarkers(), 4);
mgr.refresh();
});
}
我也尝试过应用此链接的源代码，但没有任何结果。当我将源代码直接复制到我的计算机并用标记替换所有图标时，标记仍然不会出现。我似乎无法想象如何使用标记管理器显示标记。 http://google-maps-utility-library-v3.googlecode.com/svn/tags/markermanager/1.0/examples/weather_map.html
答案 0 :(得分：9)
我的程序失败的真正原因是因为标记管理器不适用于带有标签的标记。
然而，实际上有一种更简单的方法来满足我的需求。
function initialize() {
map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions);
getMarkers();
google.maps.event.addListener(map,'zoom_changed',function () {
if (map.getZoom() >= 3) showMarkers();
if (map.getZoom() <= 2) eraseMarkers();
});
}
function eraseMarkers() {
for (i = 0; i < locations.length; i++) {
marker[i].setVisible(false);
}
}
function showMarkers() {
for (i = 0; i < locations.length; i++) {
marker[i].setVisible(true);
}
}
function getMarkers() {
for (i = 0; i < locations.length; i++) {
marker[i] = new MarkerWithLabel({
position: new google.maps.LatLng(locations[i][1], locations[i][2]),
draggable: false,
map: map,
labelContent: locations[i][3],
labelAnchor: new google.maps.Point(30, 0),
labelClass: "labels", // the CSS class for the label
labelStyle: {opacity: 0.75}
});
}
eraseMarkers();
}
答案 1 :(得分：1)
看起来你要做的事情叫做Marker Clustering。
这里有许多官方google exmamples https://developers.google.com/maps/articles/toomanymarkers写在原生javascript上
http://gmap3.net/examples/clustering.html - 使用jQuery库。
我希望这会对你有所帮助。