Code

function onNodeCreated(sender, args)
{
	var node = args.getNode();

	var nBounds = node.getBounds ();
	var topLeftCoord = diagram.docToClient(nBounds.topLeft());
	var bottomRightCoord = diagram.docToClient(nBounds.bottomRight());

	var pieChartCanvas = document.createElement('canvas');
	pieChartCanvas.width = bottomRightCoord.x - topLeftCoord.x;
	pieChartCanvas.height = bottomRightCoord.y - topLeftCoord.y;

	document.body.appendChild(pieChartCanvas);
	createPie(pieChartCanvas);
	var pieImageLocation = pieChartCanvas.toDataURL();
	node.setImageLocation(pieImageLocation);
	document.body.removeChild(pieChartCanvas);
}

//draw a pie chart on the provided canvas
function createPie(pieChartCanvas)
{
	var pieChart = new Controls.PieChart(pieChartCanvas);
	pieChart.startAngle = 45;
	pieChart.showLegend = false;
	pieChart.title = "Sales";
	pieChart.titleMargin = new Charting.Margins(0, 10, 0, 0);

	pieChart.chartPadding = 3;

	// create sample data
	var values = new Collections.List([20.00, 30.00, 15.00, 40.00]);
	pieChart.series = new Charting.PieSeries(
		values,
		new Collections.List(["20", "30", "15", "40"]),
		null);

	var brushes = new Collections.List(
	[
		new Drawing.Brush("#0455BF"),
		new Drawing.Brush("#033E8C"),
		new Drawing.Brush("#F24405"),
		new Drawing.Brush("#F21905")
	]);

	var seriesBrushes = new Collections.List();
	seriesBrushes.add(brushes);

	var strokes = new Collections.List(
	[
		new Drawing.Brush("#c0c0c0")
	]);

	var seriesStrokes = new Collections.List();
	seriesStrokes.add(strokes);

	pieChart.plot.seriesStyle = new Charting.PerElementSeriesStyle(seriesBrushes, seriesStrokes);
	pieChart.theme.highlightStroke = new Drawing.Brush("#000063");
	pieChart.theme.dataLabelsFontSize = pieChartCanvas.height/20;
	pieChart.theme.dataLabelsBrush = new Drawing.Brush("#FFFFFF");

	pieChart.draw();
}