Изменить цвет точек в серии

XYSeries series = new XYSeries("Main"); 
XYSeriesCollection dataset = new XYSeriesCollection();
dataset.addSeries(series);
jFreeChart = ChartFactory.createXYLineChart(null, "first", "second", dataset, PlotOrientation.VERTICAL, false, true, false);
XYPlot plot = jFreeChart.getXYPlot(); 
XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer();
renderer.setSeriesLinesVisible(0, false);
plot.setRenderer(renderer);
 
//..................
 
for (int i = 0; i < length; ++i)
    series.add(x, y);

public class JChart {
    
    private final JFreeChart jFreeChart;
    private final XYSeriesCollection dataset;
    private final XYLineAndShapeRenderer renderer;
    private final Color[] color = {Color.GRAY, Color.RED, Color.BLUE, Color.GREEN, Color.YELLOW, Color.ORANGE, Color.BLACK};
    
    public JChart() {       
        dataset = new XYSeriesCollection();
        jFreeChart = ChartFactory.createXYLineChart(null, null, null, dataset, PlotOrientation.VERTICAL, true, true, false);
        XYPlot plot = jFreeChart.getXYPlot(); 
                renderer = new XYLineAndShapeRenderer();
                renderer.setSeriesLinesVisible(0, false);
                plot.setRenderer(renderer);
    }
    
    public JFreeChart returnChart() {
        return jFreeChart;
    }
    
    public void setMaxSeriesCount(int count) {
        dataset.removeAllSeries();
        for (int i = 0; i < count; ++i) {
            dataset.addSeries(new XYSeries("Cluster " + i));
            renderer.setSeriesLinesVisible(i, false);
            renderer.setSeriesPaint(i, color[i]);
        }
    }
    
    public void clear() {
        for (int i = 0; i < dataset.getSeriesCount(); ++i)
            dataset.getSeries(i).clear(); 
    }
    
    public void drawPoint(double x, double y, int num) {
        dataset.getSeries(num).add(x, y);
    }
}