Itext PDF writer,有没有办法在pdf中允许unicode下标符号? (没有setTextRise) [英] Itext PDF writer, Is there any way to allow unicode subscript symbol in the pdf? (Without setTextRise)
问题描述
我一直在尝试使用Itext PDF writer创建PDF文件。我发现默认字体中不允许使用上标(0,4,5,6,7,8,9)和下标(0,1,2,3,4,5,6,7,8,9) 。在默认设置中,PDF文本中仅允许使用上标1,2,3。
I have been trying to create PDF files using Itext PDF writer. I have found that Superscript (0,4,5,6,7,8,9) and Subscript (0,1,2,3,4,5,6,7,8,9) are not allowed in the default font. Only Superscript 1,2,3 are allowed in PDF texts in the default setting.
我的PDF中的字符串包含下标和上标字符,有没有办法可以用PDF格式显示它们?
A String in my PDF contains subscript and superscript characters, is there a way i can display them in PDF?
我搜索并找到:
- setTextRise()方法用于改变文本相对于当前行的位移,I不能使用它,因为我不知道哪些字符是超级/子脚本。
- 是否有设置将文本的编码/字体更改为UTF-8,以便它允许所有的unicode符号?
或者其他方式,因为我必须显示化学符号,如H 2 SO 6,O 2等。
Or some other way, because i have to show chemical symbols like H₂SO⁴, O₂ etc.
这对你有很大帮助,谢谢!
It'd be of great help, thanks!
推荐答案
请看一下 SubSuperScript
我在回答你的问题时写的一个例子。我正在写这样的H₂SO⁴:
Please take a look at the SubSuperScript
example I wrote in answer to your question. I'm writing H₂SO⁴ like this:
BaseFont bf = BaseFont.createFont(FONT, BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
Font f = new Font(bf, 10);
Paragraph p = new Paragraph("H\u2082SO\u2074", f);
document.add(p);
我在维基百科上找到了特定字符的值: http://en.wikipedia.org/wiki/Unicode_subscripts_and_superscripts
I've found the values of the specific characters on Wikipedia: http://en.wikipedia.org/wiki/Unicode_subscripts_and_superscripts
As你可以看到,iText完全能够显示用下标或上标写的特殊字符: sub_superscript.pdf
As you can see, iText is perfectly capable to show the special characters written in subscript or superscript: sub_superscript.pdf
我写这个例子时遇到的主要问题是找到支持特定字形的字体。这就是我在之前的评论中解释的内容。我最终使用了一种名为Carbo Regular的字体。
The main problem I had when I wrote this example was finding a font that supported the specific glyphs. That's what I explained in my earlier comment. I ended up using a font called "Carbo Regular".
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