A simple, single-binary program that creates a PNG image of a chess diagram from its FEN record. The diagram style follows the one commonly used in printed books.
For drawing, the program uses a TTF chess font (Merida), so creates high-quality output images independent of size.
FEN notation is extended with dots d and crosses x to mark squares.
The program is created with the goal of rendering FEN in Markdown documents.
A Lua filter for Pandoc is included: it replaces code blocks that have fen
syntax with the diagrams, embedded in base64 (as data URL). A FEN record should
be written on the first line of the code block, options for the fen2png can be
written on the second line.
Usage: fen2png [options] <fen> <output-file>
Options:
--size=<size> Diagram size (height and width) in pixels (default: 400)
--bg=<color> Background color (default: FFFFFF)
--fg=<color> Foreground color (default: 0)
--base64 Base64 output
--coordinates Show coordinates on the diagram
--flip Flip the diagram
--auto-flip Flip the diagram if Black to move
Color must be a hexadecimal number with the four octets from the most to the
least significant represents transparency, red, green, and blue components
respectively. Transparency of 0 means fully opaque.
Positional arguments:
<fen> FEN record
<output-file> Output file name or "-" for the stdout
The program uses a freeware chess font "Merida" created by Armando Hernandez Marroquin. The program itself dedicated to the public domain.
