在图像背景上覆盖文字并转换为PDF [英] Overlay text over an image background and convert to PDF

问题描述

我要使用.NET，以编程方式创建一个PDF，该PDF仅包含背景图像，在背景图像上带有两个标签，字体和位置都不同.我已经阅读了有关现有PDF库的信息，但不知道(如果适用的话)哪个是最简单的任务.

Using .NET, I want to programmatically create a PDF which simply consists of a background image with two labels over it with different fonts and positioning. I have read about existing PDF libraries, but don't know (if applicable) which one is the easiest for such a simple task.

有人在指导我吗?

PD:我不想使用生成的图像创建PDF，该图像

P.D.: I do not want to create the PDF with a generated image that already overlays the text over the background image.

这是最终的工作代码:

This is the final working code:

public string Create()
{
    if (!Directory.Exists(ApplicationImagePath))
    {
        Directory.CreateDirectory(ApplicationImagePath);
    }

    // Smart card
    var doc = new Document(PageSize.GetRectangle("153 242.65"), 0, 0, 0, 0);            

    using (var stream = File.Create(filepath))
    {
       var writer = PdfWriter.GetInstance(doc, stream);

       doc.Open();

       var image = Image.GetInstance(CarnetData.Frame, ImageFormat.Png);
       image.Alignment = Element.ALIGN_CENTER;
       image.ScaleToFit(153, 242.65f);
       doc.Add(image);

       BaseFont font = BaseFont.CreateFont(GetFontPath(CarnetConfiguration.FontType), BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
       font.PostscriptFontName = CarnetConfiguration.FontType.ToString();

       float verticalPosition = writer.GetVerticalPosition(false);
       var pName = new Paragraph(CarnetData.Name, new Font(font, FontData.EmployeeFont.SizeInPoints))
                        {
                            SpacingBefore = verticalPosition - 51f,
                            MultipliedLeading = 1.1f,
                            Alignment = Element.ALIGN_CENTER
                        };

        doc.Add(pName);

        var pDepartment = new Paragraph(CarnetData.Department, new Font(font, FontData.DepartmentFont.SizeInPoints))
        {
            SpacingBefore = 1.5f,
            MultipliedLeading = 1.2f,
            Alignment = Element.ALIGN_CENTER
        };

        doc.Add(pDepartment);

        writer.ViewerPreferences = PdfWriter.PageModeUseNone + PdfWriter.CenterWindow + PdfWriter.PageLayoutSinglePage;
        doc.Close();
    }

    return filepath;
}

感谢您的帮助. :)

推荐答案

iTextSharp 是一个很棒的库您可以使用，非常简单直观:

iTextSharp is a great library you could use, very simple and intuitive:

var doc = new Document();
using (var stream = File.Create("output.pdf"))
{
    var writer = PdfWriter.GetInstance(doc, stream);
    doc.Open();

    doc.Add(Image.GetInstance(@"c:\foo\test.png"));

    var cb = writer.DirectContent;

    cb.BeginText();
    cb.SetTextMatrix(100, 220);
    var font = BaseFont.CreateFont(BaseFont.TIMES_ROMAN, BaseFont.CP1252, false);
    cb.SetFontAndSize(font, 12);
    cb.ShowText("Hello World");
    cb.EndText();

    cb.BeginText();
    cb.SetTextMatrix(100, 250);
    cb.ShowText("Some other text");
    cb.EndText();

    doc.Close();
}

这篇关于在图像背景上覆盖文字并转换为PDF的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！