Trouble creating custom AreaRenderer for AreaChart

Question

Quick first question: if I purchase the charting package, do
I get the source code? That would certainly solve my problems.
OK the real question: Does anyone have a quick example class
that is a custom AreaRenderer for an AreaChart?
I'm trying to create a custom AreaRenderer implementation.
According to the docs, I need to implement the "AreaRenderer"
interface (not IAreaRenderer (?)) which supposedly lives in
mx.charts.renderers.interfaces but Flex Builder complains that the
interface is not found.
Link to the docs:
http://livedocs.macromedia.com/flex/15/asdocs_en/mx/charts/renderers/interfaces/AreaRender er.html
Alternatively I've tried simply extending AreaRenderer but
the methods: beginDraw, draw and endDraw don't seem to be there or
are not overridable?

Answer 1

Ugh I always figure these things out just after I post. I've
been banging my head on this for over a day too.
Anyway, for anyone else all you do is extend ProgrammaticSkin
and implement IDataRenderer. Here is my sample class:
package
import mx.core.IDataRenderer;
import mx.skins.ProgrammaticSkin;
import mx.charts.series.items.AreaSeriesItem;
import mx.charts.series.renderData.AreaSeriesRenderData;
import flash.display.Graphics;
public class MyAreaRenderer extends ProgrammaticSkin
implements IDataRenderer
private var _data:AreaSeriesRenderData;
public function get data():Object
return _data;
public function set data(d:Object):void
_data = d as AreaSeriesRenderData;
override protected function updateDisplayList(width:Number,
height:Number):void
super.updateDisplayList(width, height);
var g:Graphics = graphics;
g.clear();
g.moveTo(width,height);
g.beginFill(0xFF0000);
for (var index:String in _data.filteredCache)
var item:AreaSeriesItem = _data.filteredCache[index];
g.lineTo(item.x, item.y);
g.endFill();
I'd still like to know if you get the source code to the
charting package though.