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1987-05-13
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An Introduction to GrafTool
GrafTool is a GEM-based program using either medium or high resolution
that allows you to type in mathematical functions of one variable and
graph them. It has grown out of my desire for such a tool, one I think
might be useful to algebra and calculus students (heck, math students
in general), applied mathematicians, theorectical computer scientists,
and engineers.
GrafTool will only draw two-dimensional graphs. However, a full range
of display manipulations are available (scale, labels, center) includ-
ing loading and saving your functions to disk. I have included a few
of my own function files (*.GFT) so that you can get an idea of what
GrafTool can do. I suggest that on your first use of GrafTool you
load a few different GFT files and play around with the function para-
meters. You may use Alt-Help to dump a copy of the display to your
printer, while access to desk accessories allows you to use Degas
Snapshot or other picture grabbers.
I am happy to make this version of GrafTool available for free distrib-
ution, feel free to copy it and pass it on. I see no conflict between
shareware and my copyright; I display the copyright only to attach my
name to the program in some way. If there are bug reports/suggestions,
you can leave a message for me on the ST-SDACE BBS (619) 284-3821 or
write me care of Hueysoft.
The program is rather large, I apologize, unfortunately my Lattice C
compiler has thrown many unnecessary VDI and AES links. The other part
of the problem is that its GEM resources are built-in and there's about
5K worth of help code/text. If you consider the fact that there is no
resource file and no external documentation (other than this intro-
duction) then GrafTool's size becomes easier to deal with.
Future versions of GrafTool will contain some or all of these features:
- varied function line styles/colors
- polar coordinates
- detailed external documentation
- rigorous treatment of math precision (with this version
you're OK with reasonable scales but I won't guarantee
anything as far as precision goes)
- data value dump to file or printer
- log scaled axes
- resizable text and graphics sections
- a fine-tunable aspect ratio
- 3 dimensional graphing
among other improvements.
I hope GrafTool comes in handy.
Paul Gardner
San Diego, CA
May 6, 1987