在JFreeChart中,我试图根据y值为XY线图/曲线的不同区域着色.我正在覆盖XYLineAndShapeRenderer的getItemPaint(int row,int col),但是我不确定它如何处理xs之间的线的着色,因为它只在x上获得itemPaint(整数值).
final XYLineAndShapeRenderer renderer = new XYLineAndShapeRenderer() {
@Override
@Override
public Paint getItemPaint(int row, int col) {
System.out.println(col+","+dataset.getY(row, col));
double y=dataset.getYValue(row, col);
if(y<=3)return ColorUtil.hex2Rgb("#7DD2F7");
if(y<=4)return ColorUtil.hex2Rgb("#9BCB3B");
if(y<=5)return ColorUtil.hex2Rgb("#FFF100");
if(y<=6)return ColorUtil.hex2Rgb("#FAA419");
if(y<=10)return ColorUtil.hex2Rgb("#ED1B24");
//getPlot().getDataset(col).
return super.getItemPaint(row,col);
}
}
解决方法:
看起来行之间着色的处理是在drawFirstPassShape中实现的
线条颜色似乎基于前一点
对XYLineAndShapeRenderer的此修改使用渐变填充来混合线条颜色.
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);
}
};
我删除了ColorUtil.hex2Rgb,因为我无法访问该类/方法.您可能需要修改GradientPaint以考虑点之间的距离/渐变.