POI自定义形状转png图片

package com.allen.doc.poi.png;import org.apache.poi.xslf.usermodel.*;
import org.openxmlformats.schemas.drawingml.x2006.main.*;
import org.openxmlformats.schemas.presentationml.x2006.main.impl.CTShapeImpl;import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.GeneralPath;
import java.awt.geom.Point2D;
import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.List;/*** 最佳实战：PPT 自定义形状 转 PNG* 核心：不使用 POI 绘制，纯手绘 100% 还原*/
public class PptxCustShape2PngV3 {// 输出图片大小（按比例）private static final int DEFAULT_WIDTH = 800;public static void main(String[] args) throws Exception {String pptFile = "D:\\java\\my_code\\my-doc\\src\\main\\resources\\自定义图像转png图片.pptx";String outFile = "D:\\java\\my_code\\my-doc\\src\\main\\resources\\shape.png";try (FileInputStream fis = new FileInputStream(pptFile);XMLSlideShow ppt = new XMLSlideShow(fis)) {XSLFSlide slide = ppt.getSlides().get(0);for (XSLFShape shape : slide.getShapes()) {if (isCustomShape(shape)) {BufferedImage img = renderCustomShape((XSLFAutoShape) shape);ImageIO.write(img, "PNG", new FileOutputStream(outFile));System.out.println("✅ 导出成功：" + outFile);break;}}}}// ==========================================// 1. 判断：是不是 自定义形状 (custGeom)// ==========================================public static boolean isCustomShape(XSLFShape shape) {if (!(shape instanceof XSLFAutoShape autoShape)) return false;CTShapeImpl ctShape = (CTShapeImpl) autoShape.getXmlObject();CTShapeProperties spPr = ctShape.getSpPr();return spPr != null && spPr.isSetCustGeom();}// ==========================================// 2. 核心渲染方法（手绘，100% 还原 PPT）// ==========================================public static BufferedImage renderCustomShape(XSLFAutoShape shape) {CTShapeImpl ctShape = (CTShapeImpl) shape.getXmlObject();CTShapeProperties spPr = ctShape.getSpPr();CTCustomGeometry2D custGeom = spPr.getCustGeom();CTPath2D path = custGeom.getPathLst().getPathList().get(0);// XML 原始宽高long pathW = path.getW();long pathH = path.getH();int canvasW = DEFAULT_WIDTH;int canvasH = (int) (pathH * canvasW / pathW);BufferedImage img = new BufferedImage(canvasW, canvasH, BufferedImage.TYPE_INT_ARGB);Graphics2D g2d = img.createGraphics();g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);g2d.setStroke(new BasicStroke(2.0f));// 渐变（XML 红 → 蓝）GradientPaint paint = new GradientPaint(0, canvasH, Color.RED, canvasW, 0, new Color(0, 114, 188));g2d.setPaint(paint);// ==================== 绘制路径 ====================GeneralPath gp = new GeneralPath();Point2D.Double lastPoint = buildPath(gp, path, canvasW, canvasH);g2d.draw(gp);// ==================== 绘制箭头 ====================
        drawArrowIfPresent(spPr, g2d, lastPoint);g2d.dispose();return img;}// ==========================================// 3. 从 XML 构建路径（moveTo + 所有贝塞尔曲线）// ==========================================private static Point2D.Double buildPath(GeneralPath gp, CTPath2D path, int canvasW, int canvasH) {long pathW = path.getW();long pathH = path.getH();Point2D.Double last = null;// moveToCTPath2DMoveTo moveTo = path.getMoveToList().get(0);CTAdjPoint2D p0 = moveTo.getPt();double x0 = (long)p0.getX() * 1.0 * canvasW / pathW;double y0 =  (long)p0.getY() * 1.0 * canvasH / pathH;gp.moveTo(x0, y0);last = new Point2D.Double(x0, y0);// 所有三次贝塞尔for (CTPath2DCubicBezierTo bez : path.getCubicBezToList()) {List<CTAdjPoint2D> pts = bez.getPtList();CTAdjPoint2D c1 = pts.get(0);CTAdjPoint2D c2 = pts.get(1);CTAdjPoint2D to = pts.get(2);double x1 =  (long)c1.getX() * 1.0 * canvasW / pathW;double y1 =  (long)c1.getY() * 1.0 * canvasH / pathH;double x2 =  (long)c2.getX() * 1.0 * canvasW / pathW;double y2 =  (long)c2.getY() * 1.0 * canvasH / pathH;double x3 =  (long)to.getX() * 1.0 * canvasW / pathW;double y3 =  (long)to.getY() * 1.0 * canvasH / pathH;gp.curveTo(x1, y1, x2, y2, x3, y3);last = new Point2D.Double(x3, y3);}return last;}// ==========================================// 4. 如果 XML 有箭头，就画// ==========================================private static void drawArrowIfPresent(CTShapeProperties spPr, Graphics2D g2d, Point2D.Double end) {CTLineProperties ln = spPr.getLn();if (ln == null || !ln.isSetTailEnd()) return;CTLineEndProperties tailEnd = ln.getTailEnd();if (tailEnd.getType() == STLineEndType.TRIANGLE) {int size = 10;int[] x = {(int) end.x, (int) (end.x - size), (int) (end.x - size)};int[] y = {(int) end.y, (int) (end.y - size/2), (int) (end.y + size/2)};g2d.fillPolygon(x, y, 3);}}
}