This directory contains supplementary documentation on GNU libplot, the
drawing library on which the plotting utilities graph, plot, and tek2plot
are based.

    ./colors.txt: A listing of the color names recognized by libplot,
  		  and hence by each of the three plotting utilities.  
  		  An RGB representation for each color is given.

  		  For example, you may use the command

			graph --frame-color chocolate

		  because "chocolate" is one of the listed color names.
		  In the RGB scheme, "chocolate" means (210,105,30).

The following files are relevant to the 16 Hershey fonts built into GNU
libplot.  

The program hershey-demo.c, if compiled and linked with libplot (the
instructions are at the head of the file), will emit to standard output a
sample page, in portable metafile format, illustrating many of the Hershey
fonts.  The sample page is taken from Allen Hershey's 1972 article in
Computer Graphics and Image Processing (vol. 1, no. 4, pp. 373-385).

When specifying to the plotting utilities that a Hershey font should be
used, you would usually specify it by name, e.g., `graph --font-name
HersheyGothic-English'.  However, the Hershey fonts are assembled from a
large collection of vector glyphs (`Hershey glyphs'), including both
occidental and Japanese characters.  If the current font is a Hershey font,
you may access any glyph by its number, even if it is not a character in
the font. For example, the command

	graph --font-name HersheyGothic-English -L '\#H0745\#H0745'

would label the graph being drawn with a title line consisting of
two fleurs-de-lys.  That is because the fleur-de-lys is Hershey glyph #745.

    ./hershey-number: A history of the various public distributions of the 
	Hershey glyphs, and their schemes for indexing glyphs.
    
    ./hershey.bib: A bibliography, in BibTeX format, of publications
        dealing with the Hershey glyphs and with Allen Hershey's system for
        scientific typography, which was designed to use them.  Most cited
        items are technical reports that are available from the
        U.S. National Technical Information Service (+1 703 487 4650);
        stock numbers are given.
    
    ./hershey.doc: A breakdown of the `occidental' Hershey glyphs,
        by number.
    
    ./kana.doc: The encodings used for the Hershey Hiragana and Katakana
        (syllabic Japanese characters).  These are part of the HersheyEUC
	font, but may be accessed by number.
    
    ./kanji.doc: The encoding of the 603 available Japanese Kanji
        (ideographic characters), and their meaning.  These are part of the
	HersheyEUC font, but may be accessed by number.
