private void createChart(Boolean inShowAverage) {
imageUrl = System.currentTimeMillis() + ".png";
IRenderer renderer = null;
if (dataTable.isShowableInPieChart()) {
renderer = new PieChartRenderer();
} else {
ChartRenderer crenderer = new ChartRenderer();
crenderer.setShowMeanValues(inShowAverage);
renderer = crenderer;
}