renderer.setSeriesPaint(0, gp0);
renderer.setSeriesPaint(1, gp1);
renderer.setSeriesPaint(2, gp2);
// Set the tooltips...
renderer.setBaseItemURLGenerator(new StandardCategoryURLGenerator("xy_chart.jsp","series","section"));
renderer.setBaseToolTipGenerator(new StandardCategoryToolTipGenerator());
final CategoryAxis domainAxis = plot.getDomainAxis();
domainAxis.setCategoryLabelPositions(
CategoryLabelPositions.createUpRotationLabelPositions(Math.PI / 4.0)