Nell: An SVG Drawing Language

Software

This is software for the book Nell: An SVG Drawing Language.

The software is free and distributed under the terms of the GNU General Public License. It is written in ANSI C and should compile with any C compiler.

Send questions or comments to:
Stefan (stefan at exstrom dot com)
Richard (richard at exstrom dot com).

• nell.c
  Reads a drawing definition file and expands it into a series of primitive drawing commands which can be turned into an SVG file using the nellsvg progam.

  Usage: nell ddfile scs mrl
    ddfile = name of the drawing definition file
    scs = name of the starting command string
    mrl = maximum recursion level
  

• nellsvg.c
  Reads the output of the nell program and creates an SVG file.

  Usage: nellsvg width height units sw fh
    width = width of canvas.
    height = height of canvas.
    units = px pt pc cm mm in.
    sw = stroke width in given units.
    fh = 1 to flip about the horizontal.
  

• calcfun.c
  Functions used by the nell program.
• calcfun.h
  Header file for calcfun.c

To compile these programs you will need an ANSI C compiler such as gcc. These programs are very easily compiled on the command line. With gcc you can compile using the commands:

gcc -lm -o nell calcfun.c nell.c

gcc -lm -o nellsvg nellsvg.c

This will create the nell and nellsvg executables.

When you compile with gcc as above, and you get messages that include the phrase "undefined reference", try moving the "-lm" to the end of the command so it looks like this:

gcc -o nell calcfun.c nell.c -lm

gcc -o nellsvg nellsvg.c -lm

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Send comments to: Richard Hollos (richard[AT]exstrom DOT com)
Copyright 2020 by Exstrom Laboratories LLC