GeometryService中的buffer缓冲区分析_geom1.buffer(0.01) buff.exporttowkt()-优快云博客

本文链接：https://blog.youkuaiyun.com/logenliqiang/article/details/6340222

此博客详细介绍了如何使用Flex应用程序中的GeometryService组件进行缓冲区分析。用户可以选择绘制点、线或面，然后设置缓冲距离，以创建相应几何形状的缓冲区。GeometryService完成缓冲区计算后，结果将显示在地图的GraphicsLayer上。

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<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
      xmlns:s="library://ns.adobe.com/flex/spark"
      xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" xmlns:esri="http://www.esri.com/2008/ags">
<fx:Script>
  <![CDATA[
   import com.esri.ags.Graphic;
   import com.esri.ags.SpatialReference;
   import com.esri.ags.events.DrawEvent;
   import com.esri.ags.events.GeometryServiceEvent;
   import com.esri.ags.geometry.Geometry;
   import com.esri.ags.geometry.Polygon;
   import com.esri.ags.tasks.supportClasses.BufferParameters;

   import mx.rpc.AsyncResponder;

   import spark.events.IndexChangeEvent;
   var geometrys:Array = [];
   protected function buttonbar1_changeHandler(event:IndexChangeEvent):void
   {
    switch (myButtonBar.selectedItem)
    {
     case "点":
      myDrawTool.activate(com.esri.ags.tools.DrawTool.MAPPOINT);
      break;
     case "线":
      myDrawTool.activate(com.esri.ags.tools.DrawTool.FREEHAND_POLYLINE);
      break;
     case "面":
      myDrawTool.activate(com.esri.ags.tools.DrawTool.FREEHAND_POLYGON);
      break;
    }
   }

   protected function button1_clickHandler(event:MouseEvent):void
   {

    var bufferparameters:BufferParameters = new BufferParameters();//缓冲区分析参数
    bufferparameters.distances = [100,300]; //缓冲区距离
    bufferparameters.geometries = geometrys; //创建缓冲区几何

    bufferparameters.unit = GeometryService.UNIT_KILOMETER;

myGeometryService.buffer(bufferparameters);
}

   protected function myDrawTool_drawEndHandler(event:DrawEvent):void
   {
             var mygeomertry:Geometry = event.graphic.geometry;
    geometrys.push(mygeomertry);

   }

   protected function myGeometryService_bufferCompleteHandler(event:GeometryServiceEvent):void
   {
    for each (var geometry:Polygon in event.result)
    {
     var graphic:Graphic = new Graphic();
     graphic.geometry = geometry;

     myGraphicsLayer.add(graphic);
    }

}

]]>
</fx:Script>
<fx:Declarations>
  
<esri:GeometryService bufferComplete="myGeometryService_bufferCompleteHandler(event)" id="myGeometryService" url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer" />
<esri:DrawTool drawEnd="myDrawTool_drawEndHandler(event)" id="myDrawTool" map="{myMap}" graphicsLayer="{myGraphicsLayer}" />
</fx:Declarations>
<esri:Map id="myMap">
  <esri:ArcGISTiledMapServiceLayer url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer" />
     <esri:GraphicsLayer id="myGraphicsLayer" />
</esri:Map>
<s:ButtonBar id="myButtonBar" x="75" y="11" change="buttonbar1_changeHandler(event)">
  <s:ArrayCollection>
   <fx:String>点</fx:String>
      <fx:String>线</fx:String>
   <fx:String>面</fx:String>
  </s:ArrayCollection>
</s:ButtonBar>
<s:Button x="289" y="11" click="button1_clickHandler(event)" label="计算缓冲区"/>
</s:Application>