Pie Chart summarizing grid data

Question

New to Flex.  Searched for a method to build a pie chart based on a column in the grid we've created.
So Far:
The grid gets created based on info passed in a form.
I can get two pie charts to be created based on specific columns in the data.
The pie charts currently have 1 slice per row of data.
Am I missing an easy way to build a Pie Chart that summarizes this?
Instead of One Pie Slice per record, how do we get one pie slice per unique value in the data column?
For instance:
a datagrid of   source IP | Dest IP | Dest Port | Action
I'd like a pie chart showing the percent of data per source IP.
Is there something built in to Flex to handle this?

Answer 1

Cool...  So if my XML looks like this:
<options>
<option>
  <datetime>2008-04-21 14:15:49</datetime>
  <origin>stone</origin>
  <action>reject</action>
  <rule>default</rule>
  <srcip>192.168.93.64</srcip>
  <dstip>192.168.201.10</dstip>
  <dport>988/tcp</dport>
</option>
</options
And datagrid dataprovider is {eventData},
eventData = event.result.option as XMLList;
would it be:
var ipSummary:Object = {};
for each (var record:Object in eventData) {
  ipSummary[record.srcip] = (ipSummary[record.srcip] || 0) + 1;
var pieData:Array = [];
for (var key:String in ipSummary) {
  pieData.push({ srcip: key, activityCount: ipSummary[key] });
The PieChart would look like:
<mx:PieChart id="piechart2" dataProvider="{pieData}" showDataTips="true">
<mx:series>
  <mx:PieSeries id="pieact" displayName="Source IP" field="activityCount"/>
</mx:series>
</mx:PieChart>
Obviously I'm New at Flex...