symbolFunction property of a graphic layer, however this function is called on each graphic feature and does not have a "grand picture" of the full set. This is the case of a quantile distribution, where the features are rank-ordered and equal number of features are placed in colored bucket. Here is the result:
Each country is color coded based on a quantile distribution of its area property over a specified number of classes. Here is the code:
<?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"
xmlns:sample="com.esri.ags.sample.*"
layout="absolute"
>
<sample:QuantileAreaCalculator
numClasses="{numClasses.value as Number}"
graphicProvider="{queryTask.executeLastResult.features}"/>
<esri:QueryTask id="queryTask" url="http://tejas:8399/arcgis/rest/services/maps/world/MapServer/1">
<esri:Query id="query" returnGeometry="true" where="{where.text}">
<esri:outFields>
<mx:String>*</mx:String>
</esri:outFields>
</esri:Query>
</esri:QueryTask>
<mx:Panel width="100%" height="100%" title="Quantile Thematic Mapping">
<mx:HBox width="100%" height="100%" horizontalGap="0">
<esri:Map id="map">
<esri:ArcGISDynamicMapServiceLayer
url="http://tejas:8399/arcgis/rest/services/maps/world/MapServer"/>
<esri:GraphicsLayer id="graphicsLayer"
graphicProvider="{queryTask.executeLastResult.features}">
</esri:GraphicsLayer>
</esri:Map>
<mx:DataGrid dataProvider="{queryTask.executeLastResult.attributes}" width="100%" height="100%">
<mx:columns>
<mx:DataGridColumn headerText="Name" dataField="NAME"/>
<mx:DataGridColumn headerText="Area" dataField="AREA"/>
</mx:columns>
</mx:DataGrid>
</mx:HBox>
<mx:ControlBar>
<mx:TextInput id="where" text="FID < 10"/>
<mx:Button label="Query" click="queryTask.execute()"/>
<mx:ComboBox id="numClasses">
<mx:ArrayCollection>
<mx:Number>2</mx:Number>
<mx:Number>3</mx:Number>
<mx:Number>4</mx:Number>
<mx:Number>5</mx:Number>
</mx:ArrayCollection>
</mx:ComboBox>
</mx:ControlBar>
</mx:Panel>
</mx:Application>
QuantileAreaCalculator Class that intercepts the query last result and performs a quantile distribution of the features. A graphic feature is assigned to a bucket, and is assigned the symbol associated with that bucket.QuantileAreaCalculator numClasses property is bound to the numClasses combo box value, where upon a value change, the distribution is recalculated and the layer is auto refreshed. Download the full source code from here.
<%@ page contentType="text/xml" language="java" %>
<%
final double lat = -45.0 + 50.0 * Math.random();
final double lon = -45.0 + 50.0 * Math.random();
%>
<feed
xmlns="http://www.w3.org/2005/Atom"
xmlns:georss="http://www.georss.org/georss">
<title>Earthquakes</title>
<subtitle>International earthquake observation labs</subtitle>
<updated>2005-12-13T18:30:02Z</updated>
<author>
<name>Mansour Raad</name>
<email>mraad@esri.com</email>
</author>
<id>urn:uuid:60a76c80-d399-11d9-b93C-0003939e0af6</id>
<entry>
<title>M 3.2, Mona Passage</title>
<id>urn:uuid:1225c695-cfb8-4ebb-aaaa-80da344efa6a</id>
<updated>2005-08-17T07:02:32Z</updated>
<summary>We just had a big one.</summary>
<georss:point><%=lat%> <%=lon%></georss:point>
</entry>
</feed>
<?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"
xmlns:georss="com.esri.ags.georss.*"
>
<mx:TraceTarget/>
<esri:Map>
<esri:ArcGISTiledMapServiceLayer
url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_Imagery_World_2D/MapServer"/>
<georss:GeoRSSLayer
url="http://localhost:8080/georss.jsp"
delay="15000">
<georss:symbol>
<esri:SimpleMarkerSymbol style="circle" color="0x00FFFF" size="20"/>
</georss:symbol>
</georss:GeoRSSLayer>
</esri:Map>
</mx:Application>
url attributes points to the georss feed location, and the delay attribute indicates the delay time in milliseconds to check for new feed entries. You can download the full source code from here. This is assuming that you are using the Flex API for ArcGIS :-)
graphicProvider="{queryTask.executeLastResult.features}"dataProvider="{queryTask.executeLastResult.attributes}"
<?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"
xmlns:sample="com.esri.ags.sample.*"
layout="absolute"
>
<esri:QueryTask id="queryTask" url="http://tejas:8399/arcgis/rest/services/maps/world/MapServer/1">
<esri:Query id="query" returnGeometry="true" where="{where.text}">
<esri:outFields>
<mx:String>*</mx:String>
</esri:outFields>
</esri:Query>
</esri:QueryTask>
<mx:Panel width="100%" height="100%">
<mx:HBox width="100%" height="100%" horizontalGap="0">
<esri:Map id="map">
<esri:ArcGISDynamicMapServiceLayer
url="http://tejas:8399/arcgis/rest/services/maps/world/MapServer"/>
<esri:GraphicsLayer id="graphicsLayer"
graphicProvider="{queryTask.executeLastResult.features}">
<esri:symbol>
<esri:SimpleFillSymbol color="0xFF0000"/>
</esri:symbol>
</esri:GraphicsLayer>
</esri:Map>
<mx:DataGrid width="100%" height="100%"
dataProvider="{queryTask.executeLastResult.attributes}">
<mx:columns>
<mx:DataGridColumn headerText="Name" dataField="NAME"/>
<mx:DataGridColumn headerText="FIPS" dataField="FIPS_CODE"/>
<mx:DataGridColumn headerText="Area" dataField="AREA"/>
</mx:columns>
</mx:DataGrid>
</mx:HBox>
<mx:ControlBar>
<mx:TextInput id="where" text="FID < 10"/>
<mx:Button label="Query" click="queryTask.execute()"/>
</mx:ControlBar>
</mx:Panel>
</mx:Application>