Release 1.1 of the GNU plotting utilities is now available for ftp from
prep.ai.mit.edu/pub/gnu, as the file plotutils-1.1.tar.gz . It is also at
the GNU mirror sites. A list of mirror sites is appended below; please try
them before you try prep.ai.mit.edu.
The package includes `libplot', a subroutine library for 2-D
device-independent vector graphics, and `graph', a sample application for
plotting 2-D scientific data which is built on top of `libplot'. Supported
devices include X Window System displays, Postscript devices, and Tektronix
emulators. xfig output format, which can be edited with the freeware
`xfig' graphics editor, is also supported. The Postscript output format
includes directives which allow it to be edited with the freeware `idraw'
Included with `libplot' and `graph' are `spline', a program that uses
splines in tension to interpolate data, and `ode', a program that will
integrate a system of ordinary differential equations numerically.
`libplot', `graph', and `spline' are modern, GNU replacements for the
traditional plot(3) library, and graph(1) and spline(1) programs, found on
some versions of Unix. They have many new features. For example,
`libplot' supports color (both pen color and fill color), and can draw text
in any of 12 Hershey fonts and 35 Postscript fonts, at any angle.
It includes new graphics primitives (it can draw ellipses and elliptic arcs,
and maintains a Postscript-style stack of graphics contexts). GNU `graph'
supports color, and the new fonts. It can also function as a real-time
filter, plotting data points as they are generated.
I'd like to thank the many people who contributed to the plotutils package:
Rich Murphey (who wrote the old GNU `graphics' package, which served as a
starting point), Peter Karow of URW and Ken Turkowski of Apple (who thought
of the sagitta algorithm I use for drawing circular and elliptic arcs),
Pete Holzmann and Jim Hurt (who many years ago made the Hershey glyphs
available), and especially Nick Tufillaro (who wrote `ode'). Quite a few
others helped out too, in various ways.
Bug reports and suggestions for improvements are solicited (this is
release 1.1, after all).
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