是否可以通过点击放大集群？我也不知道如何禁用集群弹出窗口。我读过this question ，但仍然不知道该怎么做。 这是代码:
<html>
<script src="../ol/OpenLayers.js"></script>
<script>
var map, select;
var lat = 53.507;
var lon = 28.145;
var zoom = 7;
function init() {
map = new OpenLayers.Map("map",
{ maxExtent: new OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34),
numZoomLevels: 19,
maxResolution: 156543.0399,
units: 'm',
projection: new OpenLayers.Projection("EPSG:900913"),
displayProjection: new OpenLayers.Projection("EPSG:4326"),
controls: [
new OpenLayers.Control.Navigation(),
new OpenLayers.Control.PanZoomBar(),
new OpenLayers.Control.ScaleLine(),
new OpenLayers.Control.Permalink('permalink'),
new OpenLayers.Control.Attribution(),
new OpenLayers.Control.MousePosition()
] });
var osm = new OpenLayers.Layer.OSM("OpenStreetMap");
map.addLayer(osm);
var lonLat = new OpenLayers.LonLat(lon, lat).transform(map.displayProjection, map.projection);
if (!map.getCenter()) map.setCenter (lonLat, zoom);
var MyStyle = new OpenLayers.Style({
// 'cursor' : 'pointer',
fillColor : "#336699",
fillOpacity : 0.9,
fontColor: "#000080",
fontFamily: "sans-serif, Arial",
// fontWeight: "bold",
externalGraphic: "atm.png",
graphicWidth: 32,
graphicHeight: 37,
label: "${count}",
labelAlign: "ct",
fontSize: "15px",
});
var layer = new OpenLayers.Layer.Vector("Atm", {
protocol: new OpenLayers.Protocol.HTTP({
url: "atm.txt",
format: new OpenLayers.Format.Text({extractStyles: true}),
params: {
extractAttributes: false,
}
}),
styleMap: MyStyle, <!-- --------------------- style -->
projection: map.displayProjection,
strategies: [
new OpenLayers.Strategy.BBOX({ratio: 1, resFactor: 1.1}),
new OpenLayers.Strategy.Cluster({distance: 50, threshold: 3})
]
});
map.addLayer(layer);
// Interaction; not needed for initial display.
selectControl = new OpenLayers.Control.SelectFeature(layer);
map.addControl(selectControl);
selectControl.activate();
layer.events.on({
'featureselected': onFeatureSelect,
'featureunselected': onFeatureUnselect
});
}
// Needed only for interaction, not for the display.
function onPopupClose(evt) {
// 'this' is the popup.
var feature = this.feature;
if (feature.layer) { // The feature is not destroyed
selectControl.unselect(feature);
} else { // After "moveend" or "refresh" events on POIs layer all
// features have been destroyed by the Strategy.BBOX
this.destroy();
}
}
function onFeatureSelect(evt) {
feature = evt.feature;
popup = new OpenLayers.Popup.FramedCloud("featurePopup",
feature.geometry.getBounds().getCenterLonLat(),
new OpenLayers.Size(100,100),
"<h2>"+feature.attributes.title + "</h2>" +
feature.attributes.description,
null, true, onPopupClose);
feature.popup = popup;
popup.feature = feature;
map.addPopup(popup, true);
}
function onFeatureUnselect(evt) {
feature = evt.feature;
if (feature.popup) {
popup.feature = null;
map.removePopup(feature.popup);
feature.popup.destroy();
feature.popup = null;
}
}
</script>
</head>
<body onload="init()">
<div id="map"></div>
</body>
</html>
谢谢。您的帖子没有太多上下文来解释代码部分；请更清楚地解释您的情况。
最佳答案
function onFeatureSelect(event) {
if(!event.feature.cluster) // if not cluster
{
// handle your popup code for the individual feature
}
else
{
// fetch the cluster's latlon and set the map center to it and call zoomin function
// which takes you to a one level zoom in and I hope this solves your purpose :)
map.setCenter(event.feature.geometry.getBounds().getCenterLonLat());
map.zoomIn();
}
}
关于zooming - Openlayers 放大集群，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/8257585/