This is a library for manipulating TikZ's soft paths. When TikZ reads a path construction, it first constructs a soft path before converting it into an actual path in the output document. A soft path contains the information needed to build the path in a TeX macro, whence it can be manipulated before it is baked.
This library provides ways of modifying these paths before they are baked.
It also provides some sub-packages which make use of this facility:
knotsfor drawing knot diagrams, sorting out the crossings at intersectionscalligraphywhich turns a path into one that might be drawn by a calligraphic penspath3which is a user-level interface to the core functionality
These libraries are on CTAN and are
included in TeXLive and MikTeX. You should obtain them from one of those
sources. If you know that you need the most up to date version from here,
then download the file spath3_code.dtx and run tex spath3_code.dtx to generate the
files.
The simplest way to get the documentation is via texdoc or from CTAN. To generate it from source, run pdflatex on one of the _doc.tex files or on spath3.tex.
