The code below works...most of the time. I want the user to draw a polygon, then use the graphic to select all the parcels it intersects. The selected set of parcels will then be buffered.If a graphic is drawn that covers a large amount of parcels or has several vertices, the query only returns a portion of the parcels covered by the graphic. It's pretty random too in what it misses. I am simplyfing the polygon. The sample for selecting parcels does the same thing if a large area is defined.I'm trying to build a notification program and there are many times when a large area needs to be defined. Any suggestions??<?xml version="1.0" encoding="utf-8"?>
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml"
xmlns:esri="http://www.esri.com/2008/ags"
styleName="plain"
>
<mx:Script>
<![CDATA[
import com.esri.ags.tasks.Query;
import com.esri.ags.tasks.QueryTask;
import com.esri.ags.events.QueryEvent;
import com.esri.ags.events.GeoprocessorEvent;
import com.esri.ags.events.GeometryServiceEvent;
import com.esri.ags.toolbars.Draw;
import com.esri.ags.toolbars.Navigation;
import com.esri.ags.tasks.FeatureSet;
import com.esri.ags.geometry.Geometry;
import com.esri.ags.geometry.Polygon;
import com.esri.ags.geometry.Extent;
import com.esri.ags.SpatialReference;
import com.esri.ags.Graphic;
import com.esri.ags.events.DrawEvent;
import com.esri.ags.layers.GraphicsLayer;
import com.esri.ags.tasks.BufferParameters;
import mx.rpc.events.FaultEvent;
import mx.rpc.AsyncResponder;
import mx.collections.ArrayCollection;
import mx.controls.Alert;
import mx.events.ItemClickEvent;
private var graphicParcels:Array;
private function itemClickHandler(event:ItemClickEvent):void
{
tbb.selectedIndex = -1;
myGraphicsLayer.clear();
parcelGraphicsLayer.clear();
switch (event.index)
{
case 0:
{
drawToolbar.activate(Draw.POLYGON);
break;
}
case 1:
{
drawToolbar.activate(Draw.FREEHAND_POLYGON);
break;
}
}
}
/* Required with a DrawEnd event.*/
private function onDrawEnd(event:DrawEvent):void
{
var graphic:Graphic = event.graphic;
drawToolbar.deactivate();
// Add graphic to the graphics layer
myGraphicsLayer.add(graphic);
var geometryPolygon:Polygon = graphic.geometry as Polygon;
myMap.centerAt(geometryPolygon.extent.center);
// Simplify the graphic so selection will work properly
myGeometryService.simplify([graphic]);
}
private function simplifyCompleteHandler(event:GeometryServiceEvent):void
{
findParcels(event.graphics[0]);
}
private function findParcels(graphic:Graphic):void
{
// clear the graphics layer
//myGraphicsLayer.clear();
// Create query to select parcels that intersect drawn shape
var parcelQuery : Query = new Query();
parcelQuery.returnGeometry = true;
parcelQuery.geometry = graphic.geometry;
parcelQuery.outFields = ["PARCEL", "STRNO", "STRDIR", "STRNAME", "STRTYPE"];
parcelQuery.spatialRelationship = Query.SPATIAL_REL_INTERSECTS;
parcelQuery.outSpatialReference = myMap.spatialReference;
parcelQueryTask.showBusyCursor = true;
parcelQueryTask.execute(parcelQuery, new AsyncResponder(onParcelResult, onParcelFault));;
}
private function onParcelResult(featureSet:FeatureSet, token:Object = null) : void
{
if (featureSet.features.length != 0)
{
myGraphicsLayer.clear();
// Create an extent rectangle that will cover all the parcels selected
var unionExtent : Extent;
var myFirstGraphic : Graphic = featureSet.features[0];
unionExtent = Polygon(myFirstGraphic.geometry).extent;
for each (var myGraphic : Graphic in featureSet.features)
{
myGraphic.symbol = (parsym);
// Adds parcel number and address as tool tip
myGraphic.toolTip = "Parcel: " + myGraphic.attributes.PARCEL.toString()
+ "\nAddress: " + myGraphic.attributes.STRNO + " "
+ myGraphic.attributes.STRDIR.toString() + " "
+ myGraphic.attributes.STRNAME + " "
+ myGraphic.attributes.STRTYPE;
parcelGraphicsLayer.add(myGraphic);
// Expand map extent to all selected parcels
unionExtent = unionExtent.union(Polygon(myGraphic.geometry).extent );
}
// Zoom map out a bit
//myMap.extent = unionExtent.expand(2);
myMap.extent = unionExtent.extent;
// Pass all selected parcels to array to be used by buffer function
graphicParcels = ArrayCollection(parcelGraphicsLayer.graphicProvider).toArray();
}
else
{
Alert.show("Error selecting parcels");
}
}
private function onParcelFault( info : Object, token : Object = null ) : void
{
Alert.show( info.toString() );
}
private function bufferFeature():void
{
var bufferParameters:BufferParameters = new BufferParameters();
bufferParameters.features = graphicParcels;
bufferParameters.distances = [ 500 ];
bufferParameters.unionResults = true;
bufferParameters.unit = BufferParameters.UNIT_FOOT;
bufferParameters.bufferSpatialReference = new SpatialReference(32007);
myGeometryService.addEventListener(GeometryServiceEvent.BUFFER_COMPLETE, bufferCompleteHandler1);
myGeometryService.buffer(bufferParameters);
function bufferCompleteHandler1(event:GeometryServiceEvent):void
{
for each (var graphic:Graphic in event.graphics)
{
graphic.symbol = sfs;
var buffExtent : Extent;
buffExtent = Polygon(graphic.geometry).extent;
// Zoom map out a bit
myMap.extent = buffExtent.expand(2);
myGraphicsLayer.add(graphic);
}
myGeometryService.removeEventListener(GeometryServiceEvent.BUFFER_COMPLETE, bufferCompleteHandler1);
}
}
private function onGeomFault(fe:FaultEvent):void
{
Alert.show("Unexpected fault:\n" + fe.toString());
}
]]>
</mx:Script>
<!-- Parcel query -->
<esri:QueryTask id="parcelQueryTask"
url="http://cohntfs82/ArcGIS/rest/services/public/Parcels/MapServer/0" />
<!-- Geometry Service used to project point for Google Street View -->
<esri:GeometryService
id="myGeometryService"
simplifyComplete="simplifyCompleteHandler(event)"
fault="onGeomFault(event)"
showBusyCursor="true"
url="http://cohntfs82/ArcGIS/rest/services/Tools/Geometry/GeometryServer"/>
<!-- Symbol for Polygon -->
<esri:SimpleFillSymbol id="sfs" alpha="0.4">
<esri:SimpleLineSymbol color="#FF0000" width="2" alpha=".6" style="solid"/>
</esri:SimpleFillSymbol>
<esri:SimpleFillSymbol id="parsym" alpha="0.6" color="#f1f57c">
<esri:SimpleLineSymbol color="#FF0000" width="2" alpha=".6" style="solid"/>
</esri:SimpleFillSymbol>
<esri:Draw id="drawToolbar"
map="{myMap}"
fillSymbol="{sfs}"
drawEnd="onDrawEnd(event)" />
<mx:ControlBar width="100%" horizontalAlign="center">
<mx:VBox borderStyle="solid" horizontalAlign="center" width="172">
<mx:ToggleButtonBar id="tbb"
creationComplete="tbb.selectedIndex = -1"
itemClick="itemClickHandler(event)"
toggleOnClick="true">
<mx:dataProvider>
<mx:Object id="p0" label="Polygon"/>
<mx:Object id="p1" label="FreeHand"/>
</mx:dataProvider>
</mx:ToggleButtonBar>
</mx:VBox>
<mx:Button label="Buffer" id="buttonBuffer" click="bufferFeature()"/>
</mx:ControlBar>
<esri:Map id="myMap" logoVisible="false">
<esri:ArcGISTiledMapServiceLayer
url="http://cohntfs82/ArcGIS/rest/services/public/basemap/MapServer" />
<esri:GraphicsLayer id="myGraphicsLayer"/>
<esri:GraphicsLayer id="parcelGraphicsLayer"/>
</esri:Map>
</mx:Application>
