Demo directory README (Version 4.0)

# Demo directory

#### Content

This directory contains the demo programs for STk. There are several categories of demos available from here:

- STk demos: They correspond to program which don't use CLOS like object extension of STk. These demo are quite simple and they often mimic original Tcl/Tk demonstrations
- STklos demos: These demonstration programs use the STklos object Extension of STk. The code of most of these demos has been kept short to illustrate the basic of STklos programming.
- Html demo: This demo is in fact an overview of STk/STklos that I have used once in a presentation of STklos. The pages accessible from this link present STk but also contains links or Scheme applets which illustrate the kind of things that can be done with the STk browser. Of course, to properly execute the applets contained in theses pages, you need to run the STk Html browser (see below).

#### Running demonstration programs without installing STk

If you want to run a demo BEFORE a complete installation of the STk package, you must use the shell script `../Src/test-stk` in order to run the interpreter (this shell script set some variables to run properly the interpreter without installing it).

#### Running demonstration programs in the STk web browser

Note: In this document the notation RUN means that you must type either ../Src/test-stk if you have not completed the installation of STk, either type stk (provided that the install location is in your path)

STk provides a simple Web browser which can be used to launch the demo of this directory. If you are not running it now, you can type the following command:

              RUN -f S-scape README.html

at the shell prompt.

## 1. STk demos

#### 1.1 Basic STk demos

- hello.stk
  This is the traditional first program. This program creates a single button that you can click on.
  Run with : RUN -f hello.stk

- browse.stk
  A simple Unix file browser. The code of this demo is less than a page.
  Run with: .RUN -f browse.stk

#### 1.2 Basics of STk programming

- wtour.stk
  This is a rewrite of the Tcl/Tk wtour2.0 in Scheme/STk. Use the menus to navigate through different lessons. You can make changes to the lesson source code; click on the Apply button to see the results of the changes.
  Run with: RUN -f ./wtour.stk ../Contrib/STk-wtour
  Comment: This code is a contribution of Suresh Srinivas `<ssriniva@cs.indiana.edu>`

#### 1.3 Client/Server Demos

- server.stk
  A simple server showing how to use the socket package. It creates an xterm window in which a read-eval-print-loop is executed. When the window is closed or when an error occurs, the socket is closed
  Run with: RUN -no -f server.stk

- mc-server.stk
  A multiple-clients server. On Unix, you can use several telnet sessions to discuss with the server. Each discussion has its own dedicated channel. Type `(exit)` at the STk when you want to exit the demo.
  Run with: RUN -load mc-server.stk

#### 1.4 Fun and Games

- turtle.stk
  A Logo turtle package + some demo functions.
  Run with: RUN -f turtle.stk

- hanoi.stk
  Hanoi towers animation.
  Run with: RUN -f hanoi.stk

- queens.stk
  The queens problem. You can do it yourself (and it will make sure you follow the rules) or you can ask it to solve the puzzle starting with a given board configuration.
  Run with: RUN -f queens.stk
  Comment: This code is a contribution of Grant Edwards `<grante@rosemount.com)>`

- stetris.stk
  This is a falling block game not unlike tetris(tm) :). It is implemented in STk just to prove it can be done, and as a challenge to TCLers. It starts slowly and becomes faster and faster. Have fun.
  Run with: RUN -f stetris.stk
  Comment: This code is a contribution of Harvey J. Stein `<hjstein@math.huji.ac.il>`

- ttt.stk
  A 3D Tic-Tac-Toe, where the board is 4x4x4, a 3 dimensional board of four planes with four rows and four columns each.
  Run with: RUN -f ttt.stk
  Comment: This code is a contribution of Edin "Dino" Hodzic <ehodzic@scu.edu>

#### 1.5 Misc

- console-demo.stk
  This is a simple demo showing a repl loop in a console.
  Run with: RUN -f console.stk
  Comment: This demo is useful for Unix users only, since under Win32 STk is started with such a console.

- colormap.stk
  This is a simple color palette written in STk.
  Run with: RUN -f colormap.stk
  Comment: Note that this program is no more really useful since STk offers now the function `Tk:choose-color` which allow to choose a color by name or by value.

- stkfontsel.stk
  This is a simple program which uses the STk font chooser.
  Run with: RUN -f stkfontsel.stk

- small-ed.stk
  A small editor to create enhanced text
  Run with: RUN -f small-ed.stk
  Comment: This editor use a ad-hoc format for saving file and was used for the help buttons of various widgets in old versions of STk. It will not be developed anymore since the preferred format for help is now HTML.

- showvars.stk
  A variable shower: this program shows the value of three variables (named a,b and c) Changing the value of one of these vars (with a `set!` for instance) will redisplay its new value immediately.
  Run with: RUN -load showvars.stk

- inspector.stk
  A simple demo of the inspector on Tk widgets
  Run with: RUN -f inspector.stk
  Comment: Does not work with this version of STk
  A new version of the inspector is in practically finished and will be soon released.

- term.stk
  A simple terminal emulator (a kind of xterm, but in a text widget).
  Run with: RUN -f term.stk
  Comment: Users of Glibc2 (aka libc6, or RedHat 5.0 users): This program has problems with new release of the libc under Linux, if your shell has the line editing mode set. To avoid the problem you can
  - disable the line editing mode of your shell
  - set the SHELL variable to a dumb shell (e.g. ash)
  - link STk with the old libc
  - don't run the demo :-)

## 2. STklos demos

All the standard Tk widgets have been wrapped in STklos classes. As a result, in STklos, Tk widgets are seen as instances of STklos classes.
There are two kinds of STklos widgets:

- Simple widgets which map one to one the Tk standard widgets
- Composite widgets which are built from simple Tk widgets (or even simpler composite widgets).

Demonstration programs accessible from this page use indifferently simple widgets and composite widgets.

#### 2.1 Basic STklos demos

- hello.stklos
  This is a simple rewriting of the hello.stk demonstration in STklos
  Run with: RUN -f hello.stklos

- browse.stklos
  This is a simple rewriting of the browse.stk demonstration in STklos
  Run with: RUN -f browse.stklos

- stklos-demo.stklos A simple demo written in STklos.
  Run with: RUN -f stklos-demo.stklos
  Comment: What is interesting in this demo is not what it does, nothing specially fancy, but how it is easy to program, IMHO.

- stklos-demo2.stklos Another simple demo written in STklos.
  Run with: RUN -f stklos-demo2.stklos
  Comment: Here again, what is interesting in this demo is not what it does, nothing specially fancy, but how it is easy to program, IMHO.

- classbrowse.stklos This demo shows the STklos class browser.
  Run with: RUN -f classbrowse.stklos

#### 2.2 STklos widgets

- widget.stklos
  A tour of the Tk widgets. This demo shows all the Tk widgets. This is a rewriting in STklos of the big Tcl/Tk demo `widget.tcl`. For each widget demo accessible from this program, you can see the source by just clicking the `"See code"` button. You can modify the code and test your modified version by clicking the button `"Rerun demo"`
  Run with: RUN -f widget.stk
  Comment: This demo illustrate only the simple widgets (the ones of the Tk library). For a composite widgets demo look at the `stklos-widgets.stklos` program.

- filebox.stklos
  This is a simple program which uses the `<File-box>` composite widget. A `<File-box>` is a file requester with file name completion (on the `Tab` key).This widget is itself a composition of various composite widget classes.
  Run with: RUN -f filebox.stklos

- stklos-widgets.stklos
  A quick demo of some of the STklos Composite widgets which are available in this release.
  Run with: RUN -f stklos-widgets.stklos
  Comment: This code is a contribution of Drew Whitehouse `<Drew.Whitehouse@anu.edu.au>`.

#### 2.3 STklos Applications

- calc.stklos
  This is a simplistic calculator.
  Run with: RUN -f calc.stklos

- tkcolor.stklos
  This is a simple color picker written in STklos. Clicking the left mouse button in the color box sets the text color to the chosen color. Clicking the right button sets the background color. The Select button sets the selection to a string which can be used (by pasting it in an xterm window) as argument of most X11 applications to set their foreground and background color.
  Run with: RUN -f tkcolor.stklos

- amib.stklos
  A Mini Interface Builder.
  Run with: RUN -f amib.stklos
  Comment: The current version of AMIB allow you to:
  - place objects on a plane by drag and drop
  - resize objects
  - displace objects
  - change all the slots of an object (color, font, value, ...)
  - save an interface to reload it later in an application
  However it is far from a really usable interface builder (but after all it is only a 600 lines of code application!!!!)

- S-scape.stklos
  The STk web browser. You are probably using it while seeing these lines.
  Run with: RUN -f S-scape.stklos

Last modified: Mon Sep 13 19:59:47 CEST 1999