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Oracle and Open Source
book

Oracle and Open Source

by Andy Duncan, Sean Hull
April 2001
Intermediate to advanced content levelIntermediate to advanced
432 pages
13h 2m
English
O'Reilly Media, Inc.
Content preview from Oracle and Open Source

Building Applications with Oratcl and BLT

As promised, before we leave the world of Tk, we’ll create our own small application for measuring Oracle table space usage. Building this tool, which we’ll call TableSpacer, will extend our use of Tk beyond using downloaded applications as is. This example builds on two excellent Tcl/Tk products: George Howlett’s BLT, described in this section, and Tom Poindexter’s Oratcl, already described in Chapter 3.

BLT

BLT is an extension to Tcl/Tk that adds combinations of plotting widgets (graphs, barcharts, etc.) to Tk canvases, saving you hundreds—possibly thousands—of lines of code when creating a typical on-the-fly graph within a Tk canvas object. (Not only is BLT one of the best chart-making packages around, but also the letters BLT can apparently stand for anything you want them to.)

The following are the main web sites for BLT:

http://www.tcltk.com/blt

General information on the BLT package, upgrades, latest news, and so on.

ftp://ftp.tcltk.com/pub/blt/

Central download site for the latest BLT code releases and self-installing pre-compiled Windows executable files.

ftp://tcltk.sourceforge.net/pub/tcltk/blt/

SourceForge site for all things Tcl/Tk. In this directory you will find two very useful PDF tutorial files (it’s the same tutorial in different layouts), handouts.pdf and slides.pdf.

BLT is also described in Paul Raines and Jeff Tranter’s Tcl/Tk in a Nutshell, referenced in Appendix C.

Installing BLT on Unix

Before you can install BLT, ...

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Publisher Resources

ISBN: 0596000189Catalog PageErrata