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+
+This is version 2.5 of the BLT library. It's an extension to the
+Tcl/Tk toolkit. You simply compile and link with the Tcl/Tk
+libraries. It does not require the Tcl or Tk source files.
+
+BLT is available from
+
+ www.sourceforge.net/projects/blt/files
+
+This release has been built and tested with the following Tcl/Tk
+versions:
+
+ Tcl 7.5 / Tk 4.1
+ Tcl 7.6 / Tk 4.2
+ Tcl/Tk 8.0
+ Tcl/Tk 8.1
+ Tcl/Tk 8.2
+ Tcl/Tk 8.3
+ Tcl/Tk 8.4 thru 8.4.0
+
+Avoid alpha and beta versions of Tcl/Tk. They probably won't work.
+
+What is BLT?
+
+ BLT is an extension to Tcl/Tk. It adds plotting widgets (X-Y graph,
+ barchart, stripchart), a powerful geometry manager, a new canvas
+ item, and several new commands to Tk.
+
+ Plotting widgets:
+
+ graph, barchart, stripchart
+ BLT has X-Y graph, barchart, and stripchart widgets that are
+ both easy to use and customize. All the widgets work with
+ BLT vector data objects, which makes it easy to manage data.
+
+ Tree viewer
+
+ treeview Displays a general ordered tree which may be built
+ on-the-fly or all at once.
+
+ tree Tree data object.
+
+ Tab set:
+
+ tabset Can be used either as a tab notebook or simple tabset.
+ Multi-tiered and/or scrolled tabsets are available.
+ Notebook pages can be torn-off into separate windows and
+ later put back.
+
+ Geometry Manager:
+
+ table A table-based geometry manager. Lets you specify widget
+ layouts by row and column positions in the table. Unlike the
+ packer or grid, you can finely control and constrain window
+ sizes.
+
+ Vector Data Object:
+
+ vector Lets you manage a vector of floating point values in a
+ high-level fashion. Vectors inter-operate seamlessly with
+ the plotting widgets. The graphs will automatically redraw
+ themselves when the vector data changes. Vector's components
+ can be managed through a Tcl array variable, a Tcl command,
+ or the using its own C API.
+
+ Background Program Execution:
+
+ bgexec Like Tcl's "exec ... &", but collects the output, error, and
+ status of the detached UNIX subprocesses. Sets a Tcl variable
+ upon completion.
+
+ Busy Command:
+
+ busy For preventing user-interactions when the application is
+ busy. Manages an invisible "busy" window which prevents
+ further user interactions (keyboard, mouse, button, etc.).
+ Also you can provide a busy cursor that temporarily
+ overrides those of the Tk widgets.
+
+ New Canvas Item:
+
+ eps An new item is added to the Tk canvas for handling
+ encapsulated PostScript. It lets you embed an EPS file into
+ the canvas displaying either an EPS preview image found in
+ the file, or a Tk image that you provide. When you print
+ the canvas the EPS item will automatically include the EPS
+ file, translating and scaling the PostScript. For example,
+ you could use "eps" items to tile several PostScript pages
+ into single page.
+
+ The "eps" item can also be used as a replacement for "image"
+ canvas items. Unlike "image" canvas items, the image of an
+ eps item can be printed and scaled arbitrarily.
+
+ Drag & Drop Facility:
+
+ drag&drop Adds drag-n-drop capabilities to Tk. It uses "send"-style
+ communication between drag-drop sources and targets. The
+ result is a much more powerful drag-and-drop mechanism than
+ is available with OpenLook or Motif.
+
+ Bitmap Command:
+
+ bitmap Lets you read and write bitmaps from Tcl. You can define
+ bitmaps from ordinary text strings. Bitmaps can also be
+ scaled and rotated. For example, you can create a button
+ with rotated text by defining a bitmap from a text string
+ and rotating it. You can then use the bitmap in the button
+ widget.
+
+ Miscellaneous Commands:
+
+ winop Basic window operations. You can raise, lower, map, or,
+ unmap windows. Other operations let you move the pointer
+ or take photo image snapshots of Tk widgets.
+
+ bltdebug Lets you trace the execution of Tcl commands and procedures.
+ Prints out each Tcl command before it's executed.
+
+ watch Lets you specify Tcl procedures to be run before and/or
+ after every Tcl command. May be used for logging, tracing,
+ profiling, or debugging or Tcl code.
+
+ spline Computes a spline fitting a set of data points (x and y
+ vectors) and produces a vector of the interpolated images
+ (y-coordinates) at a given set of x-coordinates.
+
+ htext A simple hypertext widget. Allows text and Tk widgets to
+ be combined in a scroll-able text window. Any Tk widget
+ can be embedded and used to form hyper-links. Other
+ options allow for selections and text searches.
+
+
+How to compile and test BLT?
+
+ See the file "INSTALL" for instructions.
+
+
+Does BLT work under Windows?
+
+ Yes. Windows 95/98/ME/NT/2000/XP. I've compiled it with both
+ MS VC++ 5.0/6.0p4 and EGCS 1.1.1. Self-installing pre-compiled versions
+ are available.
+
+What are the differences between the Windows and Unix releases?
+
+ All commands work: graphs, bgexec, busy, drag&drop etc. except
+ the "container", and "cutbuffer" widgets.
+
+ The "drag&drop" command still needs to use "send" to transfer
+ information between Tk applications. You can use
+
+ ./demos/scripts/send.tcl
+
+ to imitate "send" using DDE. Just source the script and execute
+
+ SendInit
+ SendVerify
+
+ to set up the new send command.
+
+When will...?
+
+ In general, I can't answer the "When will" questions, mostly out of
+ embarrassment. My estimates of when new features and releases will
+ occur usually turn out to be way way off.
+
+What does BLT stand for?
+
+ Whatever you want it to.
+
+Where to send bugs reports, suggestions, etc. ?
+
+ gah@siliconmetrics.com
+
+ -and-
+
+ ghowlett@grandecom.net
+
+ (best to send to both addresses) Make sure you include BLT
+ and the version number in the subject line.
+
+--gah
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