XYItemRenderer renderer = new XYBubbleRenderer(XYBubbleRenderer.SCALE_ON_RANGE_AXIS);
if (tooltips) {
renderer.setToolTipGenerator(new StandardXYZToolTipGenerator());
}
if (urls) {
renderer.setURLGenerator(new StandardXYZURLGenerator());
}
plot.setRenderer(renderer);
plot.setOrientation(orientation);
JFreeChart chart = new JFreeChart(title, JFreeChart.DEFAULT_TITLE_FONT, plot, legend);