Tkgraph 2.0
			    Mike Thomas
			wart@ugcs.caltech.edu
			    
Tkgraph grew out of my frustration that there was no decent graphing
package available for use with Tcl.  Instead of trying to do things
the easy way by extending Gnu plot or some such other graphing package,
I decided to write my own.

This software is still beta.  I have been using it quite frequently
at work, fixing small bugs here and there.  I plan on releasing a new
version as time permits and bugs surface.  If there is enough demand, I
will start a Tkgraph mailing list.

If you find any bugs with Tkgraph, please don't hesitate to notify
me.  Patches are gladly accepted.  Suggestions will be read and
taken into consideration.

Features
========

* 2d xy plots.
* Polar plots.  
* xy plots with error bars, including errors on the x value only,
  y value only, or different hi and lo errors.
* Draw a symbol for each data point, join the data points in a line,
  or both.
* Virtually unlimited datasets per graph.
* Control over the width, color, and "dashedness" of dataset lines.
* Adjustable tickmark sizes, thickness, color, and spacing.
* Adjustable tickmark label fonts and colors.
* Rotated text used for y axis labels.
* Draw arbitrary lines, circles, ovals, squares, rectangles, and text.
* Easy creation of new graphs.
* Though kludgy, it can be interfaced with other Tcl/Tk programs
  as an add-on graphing utility.
* Plots can be saved and reloaded at a later time.
* Autoconf based building of program.


Dependencies
============

Earlier versions of Tkgraph were written using Itcl2.2p2 patched with the
Dash patch.  2.0 is the first version that requires Tcl/Tk 8.0 and Itcl3.0.1.
The Dash patch is still necessary.

The Dash patch written by Jan Nijtmans may be retrieved from
http://home.wxs.nl/~nijtmans/dash.html

Other notes
===========

Please read the file "license.terms".  It applies to some of the source
files in the ./src directory.  Some of these files were modified from
some Tk distribution (7.6/8.0).

Thanks
======

Thanks to Eleftherios Gkioulekas (lf@amath.washington.edu) for all of
his help with autoconf (check out his tutorial at
http://www.amath.washington.edu/~lf/) and his Tcl m4 macros.

Thanks to John Ousterhout and the crew at Scriptics for Tcl.  And
Thanks to Michael J. McLennan for Itcl.