openlayers 相关问题

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。我读过这个问题，但仍然不知道该怎么做。这是代码：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。我读了这个问题，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,  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。 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(); } } 使用链接问题中的示例代码我将迭代集群中的所有功能以创建 BBX，然后放大到该范围。 var cluster_bounds=new OpenLayers.Bounds(); event.feature.cluster.forEach(function(feature){ clouster_bounds.extend(feature.geometry); }) map.zoomToExtent(cluster_bounds) 如果您真的不知道如何禁用弹出窗口，请删除这些功能： function onFeatureSelect(evt) { function onFeatureUnselect(evt) { 并将其替换为： function onFeatureSelect(event) { var cluster_bounds=new OpenLayers.Bounds(); event.feature.cluster.forEach(function(feature){ cluster_bounds.extend(feature.geometry); }); map.zoomToExtent(cluster_bounds); }

zooming cluster-computing openlayers

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使用 Vue.js 在 OpenLayers 中显示 geotiff 图像（组合 API）

感谢您阅读我的问题！我正在尝试显示来自 url 的 geotiff 图像，如下例所示： OpenLayers 研讨会但我希望它能够在 Vue.js 3 中使用组合 API 工作。在我的代码示例中，...

javascript vue.js openlayers geotiff

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乘以 2 个源，WebGlLayer (openlayers)

我整个晚上都在挣扎。我想做的就是将两个栅格相乘。我知道我可以使用 RasterSource 做到这一点，但我需要更好的性能。当我创建图层（webgl）时...

javascript webgl openlayers openlayers-3

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Openlayers：如何判断地图上的图层是否可用

我有疑问。在openlayers中，我如何知道是否添加了图层或地图？例如，我有一个图层控件，用于查看该图层在地图上是否可见。在传单中我这样使用它