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<HTML>
<BODY>
<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
</PRE>
<H2>DESCRIPTION</H2><PRE>
BLT is a library of extensions to the Tk library. It adds new commands
and variables to the application's interpreter.
</PRE>
<H2>COMMANDS</H2><PRE>
The following commands are added to the interpreter from the BLT
library:
<B>graph</B> A 2D plotting widget. Plots two variable data in a win-
dow with an optional legend and annotations. It has of
several components; coordinate axes, crosshairs, a leg-
end, and a collection of elements and tags.
<B>barchart</B> A barchart widget. Plots two-variable data as rectangu-
lar 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 <B>barchart</B>
widget has of several components; coordinate axes,
crosshairs, a legend, and a collection of elements and
tags.
<B>vector</B> 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.
</PRE>
<H2>ADDING BLT TO YOUR APPLICATIONS</H2><PRE>
It's easy to add BLT to an existing Tk application. BLT requires no
patches or edits to the Tcl or Tk libraries. To add BLT, simply add
the following code snippet to your application's tkAppInit.c file.
if (Tkblt_Init(interp) != TCL_OK) {
return TCL_ERROR;
}
Recompile and link with the tkblt library and that's it.
Alternately, you can dynamically load tkblt, simply by invoking the
command
% package require tkblt
from your Tcl script.
</PRE>
<H2>BUGS</H2><PRE>
Send bug reports, requests, suggestions, etc. to wjoye@cfa.harvard.edu
</PRE>
<H2>KEYWORDS</H2><PRE>
BLT
</PRE>
<HR>
<ADDRESS>
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