Openlayers中使用Cluster+Overlay实现点击单个要素和聚合要素时显示不同弹窗
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Openlayers中使用Cluster+Overlay实现点击单个要素和聚合要素时显示不同弹窗
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場景
Openlayers中使用Cluster實現縮放地圖時圖層聚合與取消聚合：
Openlayers中使用Cluster實現縮放地圖時圖層聚合與取消聚合_BADAO_LIUMANG_QIZHI的博客-CSDN博客
在上面實現聚合效果之后，如果要實現點擊聚合要素與單個要素時彈出不同的彈窗。
注：
博客：
BADAO_LIUMANG_QIZHI的博客_霸道流氓氣質_CSDN博客-C#,SpringBoot,架構之路領域博主
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實現
1、首先實現點擊要素彈窗的實現
可以參考如下
Vue+Openlayer使用overlay實現彈窗彈出顯示與關閉：
Vue+Openlayer使用overlay實現彈窗彈出顯示與關閉_BADAO_LIUMANG_QIZHI的博客-CSDN博客
2、關鍵就是監聽地圖的單擊事件并根據要素的個數分別彈窗顯示不同的內容
??????? map.on('singleclick', function (evt) {if (feature) { //捕捉到要素if (feature.values_.features && feature.values_.features.length == 1) { //只有一個要素console.log("進入單元素聚合");} else { //有多個要素??????????????????????????????????????????????????console.log("有多個要素");}} else {console.log("沒有元素");}});3、添加彈窗的標簽
??? <div id="popup" class="ol-popup"><a href="#" id="popup-closer" class="ol-popup-closer">X</a><div id="popup-content" class="popup-content"></div></div>4、設置窗體的樣式
??? <style>html,body,#map {padding: 0;margin: 0;width: 100%;height: 100%;overflow: hidden;}.ol-popup {position: absolute;background-color: white;-webkit-filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));padding: 15px;border-radius: 10px;border: 1px solid #cccccc;bottom: 12px;left: -50px;}.popup-content {width: 400px;}.ol-popup-closer {text-decoration: none;position: absolute;top: 2px;right: 8px;}</style>5、獲取到彈窗的節點DOM
??????? // 獲取到彈框的節點DOMvar container = document.getElementById("popup");var content = document.getElementById("popup-content");var closer = document.getElementById("popup-closer");6、彈窗關閉事件
??????? //彈窗關閉事件closer.onclick = function () {_that.overlay.setPosition(undefined);closer.blur();return false;};7、創建overlay對象并添加到地圖
??????? // 創建一個彈窗 Overlay 對象var overlay = new ol.Overlay({element: container, //綁定 Overlay 對象和 DOM 對象的autoPan: true, // 定義彈出窗口在邊緣點擊時候可能不完整 設置自動平移效果autoPanAnimation: {duration: 250 //自動平移效果的動畫時間 9毫秒}});map.addOverlay(overlay);8、其他都是加載離線瓦片地圖的代碼，完整示例代碼
<!doctype html> <html lang="en"><head><meta charset="UTF-8"><title>縮放地圖實現聚合與取消聚合-動態彈窗顯示</title><link rel="stylesheet" href="lib/ol65/ol.css" type="text/css"><style>html,body,#map {padding: 0;margin: 0;width: 100%;height: 100%;overflow: hidden;}.ol-popup {position: absolute;background-color: white;-webkit-filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));padding: 15px;border-radius: 10px;border: 1px solid #cccccc;bottom: 12px;left: -50px;}.popup-content {width: 400px;}.ol-popup-closer {text-decoration: none;position: absolute;top: 2px;right: 8px;}</style> </head><body><div id="map"></div><div id="popup" class="ol-popup"><a href="#" id="popup-closer" class="ol-popup-closer">X</a><div id="popup-content" class="popup-content"></div></div><script type="text/javascript" src="lib/ol65/ol.js"></script><script type="text/javascript">var source = new ol.source.XYZ({tileUrlFunction: function (xyz, obj1, obj2) {if (!xyz)return "";var z = xyz[0];var x = Math.abs(xyz[1]);var y = Math.abs(xyz[2]);var xyz_convert = self.convert_(z, x, y);x = xyz_convert[0];y = xyz_convert[1];z = xyz_convert[2];var shift = z / 2;var half = 2 << shift;var digits = 1;if (half > 10)digits = parseInt(Math.log(half) / Math.log(10)) + 1;var halfx = parseInt(x / half);var halfy = parseInt(y / half);x = parseInt(x);y = parseInt(y) - 1;var url = "./images/EPSG_900913" + "_" + self.padLeft_(2, z) + "/" + self.padLeft_(digits,halfx) + "_" + self.padLeft_(digits, halfy) + "/" + self.padLeft_(2 * digits, x) +"_" + self.padLeft_(2 * digits, y) + "." + 'png';return url;}});//projections投影坐標系轉換相關的操作var projection = new ol.proj.Projection({code: 'EPSG:900913',units: 'm',axisOrientation: 'neu'});//Layers 圖層管理類，用來管理圖層信息。主要包括Tile，Image，Vector，VectorTile等圖層。var layer = new ol.layer.Tile({source: source});// 隨機創建要素var clusterSource = new ol.source.Vector();for (var i = 1; i <= 10; i++) {var coordinates = [-11551949.709486058 + Math.random(), 5533080.7247905275 + Math.random()];var feature = new ol.Feature(new ol.geom.Point(coordinates));clusterSource.addFeature(feature);}for (var i = 1; i <= 20; i++) {var coordinates = [-11553949.709486058 + Math.random(), 5527080.7247905275 + Math.random()];var feature = new ol.Feature(new ol.geom.Point(coordinates));clusterSource.addFeature(feature);}// 聚合圖層數據源var clusterSourceForLayer = new ol.source.Cluster({source: clusterSource,distance: 100})// 聚合圖層var clusterLayer = new ol.layer.Vector({source: clusterSourceForLayer,style: function (feature, resolution) {var size = feature.get('features').length;if (size == 1) {return new ol.style.Style({image: new ol.style.Icon({scale: 0.8,src: './icon/house.png',anchor: [0.48, 0.52]}),text: new ol.style.Text({font: 'normal 12px 黑體',// // 對其方式textAlign: 'center',// 基準線textBaseline: 'middle',offsetY: -35,offsetX: 0,backgroundFill: new ol.style.Stroke({color: 'rgba(0,0,255,0.7)',}),// 文本填充樣式fill: new ol.style.Fill({color: 'rgba(236,218,20,1)'}),padding: [5, 5, 5, 5],text: `霸道的程序猿`,})});} else {return new ol.style.Style({image: new ol.style.Circle({radius: 30,stroke: new ol.style.Stroke({color: 'white'}),fill: new ol.style.Fill({color: 'blue'})}),text: new ol.style.Text({text: size.toString(),fill: new ol.style.Fill({color: 'white'})})});}}});//View 視圖管理器，主要用來管理地圖視圖，分辨率或旋轉，中心、投影、分辨率、縮放級別等。var view = new ol.View({//中心點center: [-11549894, 5533433],//縮放等級zoom: 11,//投影坐標系projection: projection,//邊界extent: [-20037508.34, -20037508.34, 20037508.34, 20037508.34]});//Map Openlayers的核心組件，包含圖層、交互事件、UI控制元素等。var map = new ol.Map({layers: [layer, clusterLayer],target: 'map',view: view});// 獲取到彈框的節點DOMvar container = document.getElementById("popup");var content = document.getElementById("popup-content");var closer = document.getElementById("popup-closer");//彈窗關閉事件closer.onclick = function () {_that.overlay.setPosition(undefined);closer.blur();return false;};// 創建一個彈窗 Overlay 對象var overlay = new ol.Overlay({element: container, //綁定 Overlay 對象和 DOM 對象的autoPan: true, // 定義彈出窗口在邊緣點擊時候可能不完整 設置自動平移效果autoPanAnimation: {duration: 250 //自動平移效果的動畫時間 9毫秒}});map.addOverlay(overlay);let _that = this;map.on('singleclick', function (evt) {let coordinate = evt.coordinate// 點擊尺 （這里是尺(米)，并不是經緯度）;var feature = map.forEachFeatureAtPixel(evt.pixel, (feature) => {return feature;});if (feature) { //捕捉到要素if (feature.values_.features && feature.values_.features.length == 1) { //只有一個要素content.innerHTML = `<p>只有一個要素的彈窗：</p><p>坐標：</p>X：${coordinate[0]} Y: ${coordinate[1]}`;_that.overlay.setPosition(coordinate); //把 overlay 顯示到指定的 x,y坐標console.log("進入單元素聚合");} else { //有多個要素??????????????????????????????????????????????????content.innerHTML = `<p>有多個要素的彈窗：</p><p>坐標：</p>X：${coordinate[0]} Y: ${coordinate[1]}`;_that.overlay.setPosition(coordinate); //把 overlay 顯示到指定的 x,y坐標console.log("有多個要素");}} else {console.log("沒有元素");}});//xy行列轉換function convert_(zoomLevel, x, y) {var extent = Math.pow(2, zoomLevel);if (x < 0 || x > extent - 1) {console.log("The X coordinate is not sane: " + x);return;}if (y < 0 || y > extent - 1) {console.log("The Y coordinate is not sane: " + y);return;}// openlayers 6.0版本var gridLoc = [x, extent - y, zoomLevel];// openlayers 4.5版本// var gridLoc = [x, extent - y + 1, zoomLevel];return gridLoc;}//字符截取function padLeft_(num, val) {return (new Array(num).join('0') + val).slice(-num);}</script> </body></html>總結
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