混合文本和图像会导致垂直定位不正确

问题描述

使用iTextSharp版本5.5.8（5.5.7中存在同样的错误），当您向章节和章节添加图像时会出现一个令人不快的错误 - 图像和章节标题开始正常但很快就会相对于彼此偏移。

Using iTextSharp version 5.5.8 (same bug existed in 5.5.7), there's an unpleasant bug when you add images to Chapters and Sections - the images and the section headings start out OK but quickly become offset relative to each other.

从以下代码生成的PDF正确地开始，它显示第1部分，下面是图像。下一部分（第2部分）有一些图像与部分文本重叠，下一部分甚至更糟，等等。我认为这是错误定位的文本，而不是图像。

The PDF generated from the following code starts out correctly, it says "Section 1" and below it is the image. The next section ("Section 2") has a little of the image overlapping the section text, the next section is even worse, etc. I think it's the text that's mal-positioned, not the image.

这是一个已知的iTextSharp错误吗？

Is this a known iTextSharp bug?

    static Document m_doc = null;
    static BaseFont m_helvetica = null;
    static Font m_font = null;
    static PdfWriter m_writer = null;

    static Image m_image = null;

    static void Main(string[] args)
    {
        m_doc = new Document(PageSize.LETTER);

        m_helvetica = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
        m_font = new Font(m_helvetica, 10.0f);

        m_writer = PdfWriter.GetInstance(m_doc, new FileStream("Output.pdf", FileMode.Create));

        m_writer.StrictImageSequence = true;

        m_doc.Open();

        m_doc.Add(new Chunk("Created by iTextSharp version " + new iTextSharp.text.Version().GetVersion, m_font));

        Chapter chapter = new Chapter("Chapter 1", 1);
        chapter.TriggerNewPage = false;

        if (m_image == null)
        {
            m_image = Image.GetInstance(new Uri("https://pbs.twimg.com/profile_images/2002307628/Captura_de_pantalla_2012-03-17_a_la_s__22.14.48.png"));
            m_image.ScaleAbsolute(100, 100);
        }

        for (int i = 0; i < 5; i++)
        {
            Section section = chapter.AddSection(18, "Section " + (i + 1));
            section.Add(new Chunk("   ", m_font));
            section.Add(m_image);
        }

        m_doc.Add(chapter);

        m_doc.Close();
    }

推荐答案

来自：

进一步查看方法：

Further looking at the Add() method in the C# source we see:

基本上，不是块使用段落。所以代替这个

Basically, instead of a Chunk use a Paragraph. So instead of this

section.Add(new Chunk("   ", m_font));

使用此：

section.Add(new Paragraph(new Chunk("   ", m_font)));

或者就是这样：

section.Add(new Paragraph("   ", m_font));

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