Java：将 JFreeChart 图形作为矢量图形插入到 powerPoint (pptx) 中

Question

我正在生成图表，我必须将其导出到 powerPoint 中。我想出了如何将图形转换为 png 并将其插入到 powerPoint 中。然而，如果您想放大图表，这并不理想。这是代码：

import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import javax.imageio.ImageIO;
import org.apache.poi.xslf.usermodel.XMLSlideShow;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.apache.batik.svggen.*;
import org.apache.poi.sl.usermodel.PictureData.PictureType;
import org.apache.poi.xslf.usermodel.XSLFPictureData;
import org.apache.poi.xslf.usermodel.XSLFPictureShape;
import org.apache.poi.xslf.usermodel.XSLFSlide;
import org.apache.batik.svggen.SVGGraphics2D;

/**
 *
 * @author vsolotyc
 */
public class JFreeChartToPpt {
    public void createPpt() throws Exception{
        // Create a new PPTX file
        XMLSlideShow ppt = new XMLSlideShow();
        
         // Create a new slide
        XSLFSlide slide = ppt.createSlide();
        
        // Generate a graph using JFreeChart
        JFreeChart chart = ChartFactory.createLineChart(
                "Graph Title", // chart title
                "X Axis", // x axis label
                "Y Axis", // y axis label
                null, // dataset
                PlotOrientation.VERTICAL, // orientation
                true, // include legend
                true, // tooltips
                false // urls
                );
        
        // Convert the graph to a BufferedImage
        BufferedImage image = chart.createBufferedImage(500, 300);
          
        // Add the image to the slide
        byte[] imageData = null;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write(image, "png", baos);
        imageData = baos.toByteArray();
        XSLFPictureData pd = ppt.addPicture(imageData, PictureType.PNG);
        XSLFPictureShape pic = slide.createPicture(pd);
        pic.setAnchor(new Rectangle(50, 50, 500, 300));
        
        // Save the PPTX file
        FileOutputStream out = new FileOutputStream("example.pptx");
        ppt.write(out);
        out.close();
    }
}

将图形导出为pdf时，图形将转换为矢量图形。

问题：将图形作为矢量图形（类似于 pdf）导出到 powerPoint 中的最佳方法是什么。

（这里是显示 pdf 导出如何工作的链接：https://thinktibits.blogspot.com/2011/05/pdf-add-chart-itext-example-jfreechart.html）

Answer 1

我最终将 jFreeChart 图形转换为 svg，然后将其添加到 pptx。它非常快并且使 pptx 相当小。

import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
import java.io.FileOutputStream;
import org.apache.poi.xslf.usermodel.XMLSlideShow;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.plot.PlotOrientation;
import org.apache.poi.xslf.usermodel.XSLFPictureData;
import org.apache.poi.xslf.usermodel.XSLFPictureShape;
import org.apache.poi.xslf.usermodel.XSLFSlide;
import org.jfree.graphics2d.svg.SVGGraphics2D;
import org.jfree.chart.JFreeChart;
import org.apache.poi.sl.usermodel.PictureData;
import org.jfree.data.category.DefaultCategoryDataset;

public class JFreeChartToPpt {

    int WIDTH = 600;
    int HEIGHT = 450;

     public void createPptFromFreeChartViaSvg() throws Exception{
        // Create a new PPTX file
        XMLSlideShow ppt = new XMLSlideShow();
        
         // Create a new slide
        XSLFSlide slide = ppt.createSlide();
        
        // Generate a graph using JFreeChart
        JFreeChart chart = generateChart();
        
        // Convert the graph to a vector graphic
        SVGGraphics2D g2 = new SVGGraphics2D(WIDTH, HEIGHT);
         Rectangle r = new Rectangle(0, 0, WIDTH, HEIGHT);
         chart.draw(g2, r);
         String svgXml = g2.getSVGDocument().toString();
        
        byte[] svgBytes = svgXml.getBytes();
        
        // adjust size and position
        Dimension slideSize = ppt.getPageSize();
        Rectangle2D anchor = new Rectangle2D.Double(
            slideSize.getWidth()/2 - WIDTH/2,  // Center horizontally
            slideSize.getHeight()/2 - HEIGHT/2, // Center vertically
            WIDTH,                            // Width
            HEIGHT                             // Height
        );
        
        // Add the SVG image to a PowerPoint presentation
        XSLFPictureData pictureData = ppt.addPicture(svgBytes, PictureData.PictureType.SVG);
        XSLFPictureShape pictureShape = slide.createPicture(pictureData);
        pictureShape.setAnchor(anchor);

        // Save the updated PowerPoint presentation
        FileOutputStream out = new FileOutputStream("exampleSvg_"+WIDTH+"x"+HEIGHT+".pptx");
        ppt.write(out);
        out.close();
    }
}