JFreeChart在同一数据系列的不同区域中使用不同的颜色

看起来线之间的着色的处理是在

drawFirstPassShape

线条颜色似乎基于先前的点

对您的修改

XYLineAndShapeRenderer

XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer(){        @Override        public Paint getItemPaint(int row, int col) { Paint cpaint = getItemColor(row, col); if (cpaint == null) {     cpaint = super.getItemPaint(row, col); } return cpaint;        }    public Color getItemColor(int row, int col) {        System.out.println(col + "," + dataset.getY(row, col));        double y = dataset.getYValue(row, col);        if(y<=3) return Color.black;        if(y<=4) return Color.green;;        if(y<=5) return Color.red;;        if(y<=6) return Color.yellow;;        if(y<=10) return Color.orange;;        return null;    }    @Override    protected void drawFirstPassShape(Graphics2D g2, int pass, int series,        int item, Shape shape) {        g2.setStroke(getItemStroke(series, item));        Color c1 = getItemColor(series, item);        Color c2 = getItemColor(series, item - 1);        GradientPaint linePaint = new GradientPaint(0, 0, c1, 0, 300, c2);        g2.setPaint(linePaint);        g2.draw(shape);    }};

我已删除，

ColorUtil.hex2Rgb

GradientPaint