'\"
'\" Smithsonian Astrophysical Observatory, Cambridge, MA, USA
'\" This code has been modified under the terms listed below and is made
'\" available under the same terms.
'\"
'\" Copyright 1991-1997 by Bell Labs Innovations for Lucent Technologies.
'\"
'\" Permission to use, copy, modify, and distribute this software and its
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'\" that the above copyright notice appear in all copies and that both that the
'\" copyright notice and warranty disclaimer appear in supporting documentation,
'\" and that the names of Lucent Technologies any of their entities not be used
'\" in advertising or publicity pertaining to distribution of the software
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'\"
'\" Lucent Technologies disclaims all warranties with regard to this software,
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'\"
.so man.macros
.TH intro n BLT_VERSION BLT "BLT Built-In Commands"
.BS
'\" Note:  do not modify the .SH NAME line immediately below!
.SH NAME
BLT \- Introduction to the BLT library
.BE
.SH DESCRIPTION
BLT is a library of extensions to the Tk library.  It adds new
commands and variables to the application's interpreter.
.LP
.SH COMMANDS
The following commands are added to the interpreter from the BLT library:
.TP 15
\fBgraph\fR 
A 2D plotting widget.  Plots two variable data in a window with an optional 
legend and annotations.   It has of several components; coordinate axes, 
crosshairs, a legend, and a collection of elements and tags.
.TP 15
\fBbarchart\fR 
A barchart widget.  Plots two-variable data as rectangular bars in a 
window.  The x-coordinate values designate the position of the bar along 
the x-axis, while the y-coordinate values designate the magnitude.
The \fBbarchart\fR widget has of several components; coordinate axes, 
crosshairs, a legend, and a collection of elements and tags.
.TP 15
\fBvector\fR 
Creates a vector of floating point values.  The vector's components
can be manipulated in three ways: through a Tcl array variable, a Tcl
command, or the C API.
.SH BUGS
Send bug reports, requests, suggestions, etc. to 
wjoye@cfa.harvard.edu
.SH KEYWORDS
BLT