获取使用iText和Xchart创建的圆环图之间的线条

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfWriter;
import org.knowm.xchart.*;
import org.knowm.xchart.style.PieStyler;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.io.IOException;

public class CircleChartExample {

    public static void main(String[] args) {
        // Step 1: Create a PDF document
        Document document = new Document(PageSize.A4, 50, 50, 50, 50);
        try {
            PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("circle_chart.pdf"));
            document.open();

            // Step 2: Create a PieChart using Xchart
            PieChart chart = new PieChartBuilder().width(500).height(400).title("Circle Chart").build();
            chart.getStyler().setLegendVisible(false);
            chart.getStyler().setAnnotationType(PieStyler.AnnotationType.Value);
            chart.getStyler().setAnnotationDistance(1.15);
            chart.getStyler().setPlotContentSize(0.7);
            chart.addSeries("Series 1", new double[]{30, 20, 50}, new String[]{"A", "B", "C"});

            // Step 3: Convert Xchart PieChart to BufferedImage
            BufferedImage bufferedImage = BitmapEncoder.getBufferedImage(chart);

            // Step 4: Get PdfContentByte and draw the BufferedImage
            PdfContentByte contentByte = writer.getDirectContent();
            contentByte.drawImage(Image.getInstance(bufferedImage, null), 100, 500);

            // Step 5: Draw line between the circle chart and the line
            contentByte.setLineWidth(1f);
            contentByte.setRGBColorStroke(0, 0, 0);
            contentByte.moveTo(100, 500);
            contentByte.lineTo(300, 500);
            contentByte.stroke();

            // Step 6: Close the document
            document.close();
            writer.close();

            System.out.println("PDF created successfully.");
        } catch (DocumentException | IOException e) {
            e.printStackTrace();
        }
    }
}