用PDFbox绘制饼图

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import java.awt.Color;
import java.io.IOException;

public class PieChartExample {
    public static void main(String[] args) {
        try {
            // 创建PDF文档
            PDDocument document = new PDDocument();
            PDPage page = new PDPage(PDRectangle.A4);
            document.addPage(page);

            // 创建页面内容流
            PDPageContentStream contentStream = new PDPageContentStream(document, page);

            // 绘制饼图
            drawPieChart(contentStream, 100, 100, 50, new double[]{30, 40, 20, 10}, new Color[]{Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW});

            // 添加图例
            addLegend(contentStream, 200, 100, new String[]{"A", "B", "C", "D"}, new Color[]{Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW});

            // 关闭页面内容流
            contentStream.close();

            // 保存PDF文档
            document.save("pie_chart.pdf");
            document.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private static void drawPieChart(PDPageContentStream contentStream, float x, float y, float radius, double[] data, Color[] colors) throws IOException {
        double total = 0;
        for (double value : data) {
            total += value;
        }

        float startAngle = 0;
        for (int i = 0; i < data.length; i++) {
            float angle = (float) (data[i] / total * 360);
            contentStream.setNonStrokingColor(colors[i]);
            contentStream.moveTo(x, y);
            contentStream.arc(x, y, x + radius, y + radius, startAngle, angle);
            contentStream.lineTo(x, y);
            contentStream.fill();
            startAngle += angle;
        }
    }

    private static void addLegend(PDPageContentStream contentStream, float x, float y, String[] labels, Color[] colors) throws IOException {
        float lineHeight = 20;
        float rectWidth = 10;
        float rectHeight = 10;
        float textOffset = 15;

        for (int i = 0; i < labels.length; i++) {
            contentStream.setNonStrokingColor(colors[i]);
            contentStream.fillRect(x, y - lineHeight * i, rectWidth, rectHeight);
            contentStream.setNonStrokingColor(Color.BLACK);
            contentStream.drawString(labels[i], x + textOffset, y - lineHeight * i);
        }
    }
}