#AGOCG Tcl/Tk Cookbook
# Tcl/Tk and C
#Authors Lakshmi & Venkat Sastry


This directory contains the source files (*.c & *.tcl) for the example
described in Chapter 6 of the Tcl/Tk Cookbook. The example shows how user 
can write C routines and register them as commands with Tcl. It also
demonstrate using other graphics packages with Tk. 

The public domain X11 Release 5 PHIGS sample implementation is used. You will 
require this PHIGS package for your system to run this example. Please refer 
to X documents and Tom Gaskins PHIGS Programming Manual if you want to use 
PHIGS.

The PHIGS box with the text "It's a square world" in the routine "MakeCube" is adopted from "A Practical Introduction to PHIGS and PHIGS Plus".


To compile the extended Tk with user defined commands that handle calls to
PHIGS, customise the makefile Make and to make type
		make  -f Makefile

It is assumed that the executable "myapp" will reside in this directory. If
you want to copy it elsewhere or run it from elsewhere, provide the
appropriate pathnames to it.

For this application, if myapp is not in the same directory, change the first
line in the file phig.tcl to point to myapp.

Ensure that you can execute the Tcl scripts.

Run the application by typing phig.tcl at command level of your window.

Bug:

Please note that when PHIGS draws in the Tk canvas, expose event doesn't 
seem to force redrawing of  structures in the PHIGS workstation. Force an
event by interacting with either the Tk scale or by selecting the line width or
colour from the menubar.