linkedgram

A program written in Haskell to draw link projection diagrams.

License

The project is released under BSD 3 License; see LICENSE.

Build

Since the project uses Gtk2Hs (https://github.com/gtk2hs/gtk2hs) for GUI, you may need to install it and related libraries before building this repository. For this, follow the instruction on their project page or HaskellWiki (https://wiki.haskell.org/Gtk2Hs/Installation). MacOS users may need to see https://wiki.haskell.org/Gtk2Hs/Mac.

Now, the easiest way to build the program is to use Stack (https://www.haskellstack.org). So just type the folloing on your terminal:

stack install

Features

• Draw link projection diagrams in Draw mode (see Warning below).
• When you finish drawing (by Right-click or toggling "Draw mode" button), crossings are automatically detected.
• Double-click on crossings for crossing-change.
• Right-click on crossing for smoothing.
• Exporting to LaTeX is supported using TikZ package.

Warning

If the following materials are overlapped, then the diagram is "ill-formed;" i.e. it is no longer valid.

• Control points you put in Draw mode.
• Convex hull of control points involved with a crossing.

To avoid this bad situation, you need to put enough numbers of control points.