如何使用带有 C# 的 itext7 将 u3d 添加到现有 pdf 中

Question

我正在使用 iText7 (C#) 创建 pdf。我需要将 u3d 图片添加到现有的 pdf 中。我可以找到示例 (http://developers.itextpdf.com/examples/itext-action-second-edition/chapter-16#619-pdf3d.java)，但它是 java 一个。谁能帮我举个 .net C# 的例子？

Answer 1

.net 的 iText 代码库被设计成（几乎）与 java 完全相同的镜像。

除了代码约定（例如以大写字母开头的方法名称）之外，您应该能够在 .net 中使用 java 代码。

这也解释了为什么我们通常不 post .net 的代码。我建议您简单地 copy/paste java 代码，更改方法名称以说明代码约定，然后尝试编译它。

如果有的话，它会给你一个代码示例，你可以在这里 post 让你 post 更明智。

Answer 2

链接示例适用于 iText5，而非 iText7。在 iText7 中，这个例子看起来像这样

  public static final String DEST = "./target/test/resources/book/part4/chapter16/Listing_16_16_Pdf3D.pdf";
    public static String RESOURCE = "./src/test/resources/img/teapot.u3d";

    public static void main(String args[]) throws Exception {
        new Listing_16_16_Pdf3D().manipulatePdf(DEST);
    }

    public void manipulatePdf(String dest) throws Exception {
        PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));

        Document doc = new Document(pdfDoc);
        Rectangle rect = new Rectangle(100, 400, 400, 400);

        PdfStream stream3D = new PdfStream(pdfDoc, new FileInputStream(RESOURCE));
        stream3D.put(PdfName.Type, new PdfName("3D"));
        stream3D.put(PdfName.Subtype, new PdfName("U3D"));
        stream3D.setCompressionLevel(CompressionConstants.DEFAULT_COMPRESSION);
        stream3D.flush();

        PdfDictionary dict3D = new PdfDictionary();
        dict3D.put(PdfName.Type, new PdfName("3DView"));
        dict3D.put(new PdfName("XN"), new PdfString("Default"));
        dict3D.put(new PdfName("IN"), new PdfString("Unnamed"));
        dict3D.put(new PdfName("MS"), PdfName.M);
        dict3D.put(new PdfName("C2W"),
                new PdfArray(new float[]{1, 0, 0, 0, 0, -1, 0, 1, 0, 3, -235, 28}));
        dict3D.put(PdfName.CO, new PdfNumber(235));

        Pdf3DAnnotation annot = new Pdf3DAnnotation(rect, stream3D);
        annot.setContents(new PdfString("3D Model"));
        annot.setDefaultInitialView(dict3D);
        pdfDoc.addNewPage().addAnnotation(annot);
        doc.close();
    }

或者，如果你想在 C# 中使用它（在本地没有运行，但 visual studio 没有抱怨语法）

    public void manipulatePdf(String dest) {
        PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));

        Document doc = new Document(pdfDoc);
        Rectangle rect = new Rectangle(100, 400, 400, 400);

        PdfStream stream3D = new PdfStream(pdfDoc, new FileInputStream(RESOURCE));
        stream3D.Put(PdfName.Type, new PdfName("3D"));
        stream3D.Put(PdfName.Subtype, new PdfName("U3D"));
        stream3D.SetCompressionLevel(CompressionConstants.DEFAULT_COMPRESSION);
        stream3D.Flush();

        PdfDictionary dict3D = new PdfDictionary();
        dict3D.Put(PdfName.Type, new PdfName("3DView"));
        dict3D.Put(new PdfName("XN"), new PdfString("Default"));
        dict3D.Put(new PdfName("IN"), new PdfString("Unnamed"));
        dict3D.Put(new PdfName("MS"), PdfName.M);
        dict3D.Put(new PdfName("C2W"),
                new PdfArray(new float[] { 1, 0, 0, 0, 0, -1, 0, 1, 0, 3, -235, 28 }));
        dict3D.Put(PdfName.CO, new PdfNumber(235));

        Pdf3DAnnotation annot = new Pdf3DAnnotation(rect, stream3D);
        annot.SetContents(new PdfString("3D Model"));
        annot.SetDefaultInitialView(dict3D);
        pdfDoc.AddNewPage().AddAnnotation(annot);
        doc.Close();
    }

Answer 3

你的问题解决了吗？如果没有，您可能也对这个替代解决方案感兴趣 - 在 C# 中使用 Spire.PDF 将 3D 交互式图形嵌入 PDF 文档。

PdfDocument doc = new PdfDocument();
PdfPageBase page = doc.Pages.Add();

Rectangle rt = new Rectangle(0, 80, 200, 200); 
Pdf3DAnnotation annotation = new Pdf3DAnnotation(rt, "teapot.u3d");
annotation.Activation = new Pdf3DActivation();
annotation.Activation.ActivationMode = Pdf3DActivationMode.PageOpen; 
Pdf3DView View= new Pdf3DView();
View.Background = new Pdf3DBackground(new PdfRGBColor(Color.Purple));
View.ViewNodeName = "test";
View.RenderMode = new Pdf3DRendermode(Pdf3DRenderStyle.Solid);
View.InternalName = "test";
View.LightingScheme = new Pdf3DLighting();
View.LightingScheme.Style = Pdf3DLightingStyle.Day;
annotation.Views.Add(View);

page.AnnotationsWidget.Add(annotation);
doc.SaveToFile("Create3DPdf.pdf", FileFormat.PDF);

Answer 4

这是使用 c#

将 u3d 文件打印成 pdf 的工作代码

FileStream stream = new FileStream("E:\Testingfolder\u3dpdf\DoctoPdf.pdf", FileMode.Open, FileAccess.Read);
        String RESOURCE;
        RESOURCE = "E:\Testingfolder\u3dpdf\Testu3d.u3d";

        iTextSharp.text.Rectangle rect;
        using (iTextSharp.text.Document document = new iTextSharp.text.Document())
        {
            PdfWriter pdfwriter = PdfWriter.GetInstance(document, stream);

            // step 3
            document.Open();
            // step 4
            rect = new iTextSharp.text.Rectangle(100, 400, 500, 800);
            rect.Border = iTextSharp.text.Rectangle.BOX;
            rect.BorderWidth = 0.5f;
            rect.BorderColor = new BaseColor(0xFF, 0x00, 0x00);
            document.Add(rect);
            document.SetMargins(129,259,647,1416);
            PdfIndirectObject streamObject = null;
            using (FileStream fs =
                new FileStream(RESOURCE, FileMode.Open, FileAccess.Read))
            {
                PdfStream stream3D = new PdfStream(fs, pdfwriter);

                stream3D.Put(PdfName.TYPE, new PdfName("3D"));
                stream3D.Put(PdfName.SUBTYPE, new PdfName("U3D"));
                stream3D.FlateCompress();
                streamObject = pdfwriter.AddToBody(stream3D);
                stream3D.WriteLength();
            }
            PdfDictionary dict3D = new PdfDictionary();
            dict3D.Put(PdfName.TYPE, new PdfName("3DView"));
            dict3D.Put(new PdfName("XN"), new PdfString("Default"));
            dict3D.Put(new PdfName("IN"), new PdfString("Unnamed"));
            dict3D.Put(new PdfName("MS"), PdfName.M);
            dict3D.Put(new PdfName("C2W"),
                    new PdfArray(new float[] { 1, 0, 0, 0, 0, -1, 0, 1, 0, 3, -235, 28 }));
            dict3D.Put(PdfName.CO, new PdfNumber(235));

            PdfIndirectObject dictObject = pdfwriter.AddToBody(dict3D);


            PdfAnnotation annot = new PdfAnnotation(pdfwriter, rect);
            annot.Put(PdfName.CONTENTS, new PdfString("3D Model"));
            annot.Put(PdfName.SUBTYPE, new PdfName("3D"));
            annot.Put(PdfName.TYPE, PdfName.ANNOT);
            annot.Put(new PdfName("3DD"), streamObject.IndirectReference);
            annot.Put(new PdfName("3DV"), dictObject.IndirectReference);
            PdfAppearance ap = pdfwriter.DirectContent.CreateAppearance(
                rect.Width, rect.Height
            );
            annot.SetAppearance(PdfAnnotation.APPEARANCE_NORMAL, ap);
            annot.SetPage();

            pdfwriter.AddAnnotation(annot);

        }

Answer 5

您也可以在 c# 中尝试以下代码，它使用的是 spire pdf

//第一步：初始化一个新的Pdf Document对象，并在PDF文档中添加一个空白页。

        PdfDocument doc = new PdfDocument();
        PdfPageBase page = doc.Pages.Add();
        //Step 2: Draw a rectangle on the page to define the canvas area for the 3D file.


        Rectangle rt = new Rectangle(0, 80, 200, 200);
        //Step 3: Initialize a new object of Pdf3DAnnotation, load the.u3d file as 3D annotation.


        Pdf3DAnnotation annotation = new Pdf3DAnnotation(rt, "E:\Testingfolder\u3dpdf\BRO_JR_6910K Femur - Bone Model.stl");
        annotation.Activation = new Pdf3DActivation();
        annotation.Activation.ActivationMode = Pdf3DActivationMode.PageOpen;
        //Step 4: Define a 3D view mode.

        Pdf3DView View = new Pdf3DView();
        View.Background = new Pdf3DBackground(new PdfRGBColor());
        View.ViewNodeName = "test";
        View.RenderMode = new Pdf3DRendermode(Pdf3DRenderStyle.Solid);
        View.InternalName = "test";
        View.LightingScheme = new Pdf3DLighting();
        View.LightingScheme.Style = Pdf3DLightingStyle.Day;
        //Step 5: Set the 3D view mode for the annotation.


        annotation.Views.Add(View);
        //Step 6: Add the annotation to PDF.

        page.AnnotationsWidget.Add(annotation);
        //Step 7: Save the file.

        doc.SaveToFile("E:\Testingfolder\u3dpdf\Create3DPdf.pdf", FileFormat.PDF);

如何使用带有 C# 的 itext7 将 u3d 添加到现有 pdf 中

How to add u3d into existing pdf using itext7 with C#

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c#

pdf

u3d

itext7