要向PDFBox OCG图层添加图像吗？

问题描述

使用PDFBox 2.0.20将图像添加到OCG层时遇到麻烦。我曾经以PDFbox - how can i add content to a layer?中的mkl答案为基础建立我的代码，当时我可能已经宣誓它可以正常工作，但是现在，如果我查看生成的PDF并打开或关闭图层，则其余部分都不会切换图像小组。

更令人困惑的是，如果我在Adobe Acrobat中的“内容”下查看，则每次调用beginMarkedContent()都会看到新的容器。每个容器的字典都有正确的图层名称，就像PDFBox是在复制图层而不是附加到图层一样，尽管在图层选项卡下没有新图层出现。

    public void add_image(
            String imageFilename,Integer adX,Integer adY,Integer rotation,Integer adWidth,Integer adHeight,String stickId,Integer fontSize,String placement)
            throws Exception,IOException {
        // get the OCG layer
        PDDocumentCatalog catalog = document.getDocumentCatalog();
        PDOptionalContentProperties ocprops = catalog.getOCProperties();
        if (ocprops == null) {
            ocprops = new PDOptionalContentProperties();
            catalog.setOCProperties(ocprops);
        }
        PDOptionalContentGroup ocgLayer = null;
        if (ocprops.hasGroup(ocgLayerName)) {
            System.out.println("Using layer named: " + ocgLayerName);
            ocgLayer = ocprops.getGroup(ocgLayerName);
            System.out.println(ocgLayer);
        } else {
            throw new Exception("OCG named '" + ocgLayerName +
                    "' does not exist in template '" + templateFilename + "'");
        }

        PDResources resources = page.getResources();
        if (resources == null) {
            resources = new PDResources();
            page.setResources(resources);
        }

        PDImageXObject image = getPdImage(imageFilename);
        contentStream = new PDPageContentStream(
                document,page,AppendMode.APPEND,false,true);

        // We can finally add the image to the layer
        contentStream.beginMarkedContent(COSName.OC,ocgLayer);
        if (rotation != 180) {
            contentStream.drawImage(image,adX,adY,adWidth,adHeight);
        } else {
            Matrix imageMatrix = Matrix.getRotateInstance(Math.toRadians(rotation),adHeight);
            contentStream.transform(imageMatrix);
            Integer imageTx = - adX;
            Integer imageTy = - adY;
            contentStream.drawImage(image,imageTx,imageTy,adHeight);
            imageMatrix = Matrix.getRotateInstance(Math.toRadians(180),adHeight);
            contentStream.transform(imageMatrix);
        }

        contentStream.endMarkedContent();
        contentStream.close();
    }

解决方法

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