tmp.initPoint = function (items) {//初始化所有农户点坐标，聚合var count = items.length;var features = new Array(count);for (var i = 0; i < items.length; i++) {var item = items[i];var feature = new Feature({geometry: new Point([item.x, item.y])});features[i] = feature;}var source = new VectorSource({features: features});var clusterSource = new Cluster({distance: 200,source: source,geometryFunction: function (evt) {return evt.getGeometry();}});var styleCache = {};var clusters = new VectorLayer({source: clusterSource,style: function (feature) {var size = feature.get('features').length;var style = styleCache[size];if (!style) {style = new Style({image: new CircleStyle({radius: 15,stroke: new Stroke({color: '#fff'}),fill: new Fill({color: '#ff0000'})}),text: new Text({text: size.toString(),fill: new Fill({color: '#fff'})})});styleCache[size] = style;}return style;}});return clusters;}

//初始化地图

tmp.initMap = function (items) {//自定义瓦片地图var baseMapLayer = new TileLayer({source: new ol.source.XYZ({url: '/maps/{z}/{x}/{y}.png',attributions: "XX公司"})});//高德地图var gaodeMapLayer = new TileLayer({source: new ol.source.XYZ({url: 'http://wprd0{1-4}.is.autonavi.com/appmaptile?lang=zh_cn&size=1&style=7&x={x}&y={y}&z={z}'})});var vectorArea = new VectorLayer({source: new VectorSource({url: '/data/kml/ChinaArea.kml',format: new KML()})});var clusters = tmp.initPoint(items);tmp.map = new Map({layers: [gaodeMapLayer, clusters, vectorArea],target: 'map',controls: ol.control.defaults().extend([new ol.control.FullScreen(),new ol.control.MousePosition(),new ol.control.ScaleLine(),new ol.control.ZoomSlider(),new ol.control.Attribution(),new ol.control.Rotate()]),view: new View({projection: 'EPSG:4326',zoom: 10,maxZoom: mapMaxZoom,minZoom: mapMinZoom,center: tmp.CenterPoint})});//事件：抓tmp.map.on('pointerdrag', function (evt) {var t = tmp.map.getView();});//事件：地图移动结束tmp.map.on('moveend', function (evt) {//console.log(evt.frameState.extent);
});};