HARU is a free, cross platform, open-sourced software library for generating
PDF. It supports the following features.
   1. Generating PDF files with lines, text, images.
   2. Outline, text annotation, link annotation.
   3. Compressing document with deflate-decode.
   4. Embedding PNG, Jpeg images.
   5. Embedding Type1 font and TrueType font.
   6. Creating encrypted PDF files.
   7. Using various character set (ISO8859-1~16, MSCP1250~8, KOI-8R).
   8. Supporting CJK fonts and encodings.

You can add the feature of PDF creation by using HARU without understanding
complicated internal structure of PDF.

WWW: http://libharu.org/