ArcGIS API for Javascript 开发：不适用esri.toolbar.draw接口，由用户控制定位中心点和半径，实现查询落在圆内的要素

来源：互联网发布：淘宝保证金在哪编辑：程序博客网时间：2024/05/21 01:28

原理就是使用先创建一个buffer，这个buffer是一个圆，然后去查询。

<span style="font-size:24px;"> bufferParams = new esri.tasks.BufferParameters();    bufferParams.geometries = [evt.mapPoint];</span>

<span style="font-size:24px;">var radius = $('#applicationslider').slider("getValue");        bufferParams.distances = [radius];        bufferParams.outSpatialReference = map.spatialReference;        bufferParams.unit = esri.tasks.GeometryService.UNIT_METER;        var gsvc = new esri.tasks.GeometryService("http://localhost/arcgis/rest/services/POI/Geometry/GeometryServer");        gsvc.buffer(bufferParams, function showBuffer(buffer) {            var graphic = new esri.Graphic(buffer[0], polygonSymbol_F);            map.graphics.add(graphic);            applicationModelOneSearchExtent = new esri.geometry.Extent(applicationModelOneCenterX - radius, applicationModelOneCenterY - radius, applicationModelOneCenterX + radius, applicationModelOneCenterY + radius, new esri.SpatialReference({ wkid: 102100 }));            var queryTask = new esri.tasks.QueryTask(applicationModelOneSearchPOIURL);            var query = new esri.tasks.Query();            query.geometry = buffer[0];</span>

<span style="font-size:24px;">var bufferFeatureLayer = new esri.layers.FeatureLayer(applicationModelOneSearchPOIURL,                {                    mode: esri.layers.FeatureLayer.MODE_SELECTION,                    outFields: ["*"]                });            bufferFeatureLayer.selectFeatures(query, esri.layers.FeatureLayer.SELECTION_NEW, completeCallBack, ErrorCallBack)}</span>

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