April 2001
Intermediate to advanced
432 pages
13h 2m
English
Content preview from Oracle and Open SourceBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.